Patent Application
20190343977
The present disclosure relates to the field of malodour counteraction. More particularly, it concerns the use of volatile compositions to limit, decrease or eliminate the perception of fecal malodour. Such compositions include a malodour antagonist system associated with perfuming ingredients performing as malodour counteractant, in a combination that significantly reduces the perception of fecal malodour. Such compositions, their use in combination with delivery systems and their applications in consumer products are objects of the present disclosure.
Smells perceived as malodourous exist in many environments and are experienced in our daily life. The odourants eliciting this negative association can for example consist of commercial and residential environment malodours which can be generated by waste products, trash receptacles, toilets, cat litter, and food handling and processing. Toilet (in particular feces), kitchen and body malodour, are just a few of the common environmental sources of malodours in daily life. Malodours are usually complex mixtures of more than one malodourant compound which may typically include various amines, thiols, sulfides, short chain aliphatic and unsaturated acids, e.g. fatty acids, and their derivatives.
Residential or body related malodours are typically due to various chemical compounds such as indole, skatole, and methanethiol found in feces malodour; piperidine and morpholine found in urine; pyridine and triethyl amine found in kitchen and garbage malodours; geonol, 1-octen-3-ol, dimethyl disulfide, dimethyl trisulfide, 3-methyl-1-butanol found in laundry malodour; and short chain fatty acids, such as 3-methyl-3-hydroxyhexanoic acid, 3-methylhexanoic acid or 3-20 methyl-2-hexenoic acid, found in axillary malodours.
Such malodours are not pleasant for humans and therefore there is a constant need for malodour counteracting technologies (MOC) for decreasing or suppressing the perception of malodours. However the task is generally very difficult because the chemicals responsible for the malodour elicit extremely powerful smells and can have much lower detection thresholds than the odourants typically used to mask them. Therefore one has to use excessive amounts of MOC composition/compounds to achieve an acceptable malodour counteracting action.
Classes of compounds have been identified and reported as being useful for reducing the perception of certain malodours. For example U.S.20100111889 describes a malodour control system suitable for use in disposable articles such as disposable cleaning wipes, baby wipes or skin care wipes, comprising an aldehyde, and ester, an ionone and a macrocyclic musk. Malodour neutralizing compositions containing acids and acyclic ketones have also been disclosed in U.S. Pat. No. 9,774,180. Other publications describe the use of compositions comprising ionones, irones and damascones in a similar context. Those classes of compounds have also been described as part of an odour masking base in personal care compositions—U.S. Pat. No. 2,919,440—or as part of a method of freshening air—U.S.20040223871.
There is still a need to find compositions that are efficient at lower concentrations in decreasing the perception of malodours. There is in particular a need for providing efficient products that would limit, decrease or eliminate the perception of toilet generated malodours, and in particular fecal malodour in order to promote public acceptance and use of toilets and discourage open defecation. The present disclosure provides a solution to the above mentioned problem by significantly enhancing the efficiency of class of ingredients known for their malodour counteraction by the addition of a malodour antagonist system, consisting of compounds that are blocking specific receptors of malodour targets.
The present disclosure relates to the use of a composition comprising a malodour antagonist system formed of ingredients that have been found to block specific receptors of fecal malodours including those disclosed in WO2014210585, together with a functional perfume accord, made of odourant ingredients which have some malodour counteraction properties. The combinations of the present disclosure have been found to provide unexpected results in terms of limitation or elimination of the perception of fecal malodour.
In a first object, the present disclosure therefore relates to the use of a composition comprising:
A malodour receptor antagonist system consisting of at least 2 ingredients selected from the group of Table 1 is also an object of the present disclosure.
Another object of the present disclosure is a malodour counteracting composition comprising
A perfumed consumer product comprising an effective amount of a malodour counteracting composition as defined above is another object of the present disclosure.
A non-therapeutic method for counteracting fecal malodour, the method comprising treating a surface or dispensing at least partly in the air a composition as defined above is also part of the present disclosure.
The numbers 1, 2, 3 correspond to the three latrines tested. Stars showed significant differences in ratings obtained without and with treatments: ns P>0.05; *P<=0.05; ** P<0.01; ***P<0.001. The black bars denote the fecal character ratings observed for the test formulation. The grey bars denote the fecal character ratings observed in the absence of the test formulation.
“dihyd” dihydrolinalol; “io” α-ionone; “iso” isoraldeine; “jas” cis jasmone; “lily” lyliflore; “lina” linalyl acetate;“ros” rosinol; “zest” zestover. The upper left panel denotes the values observed in latrine no. 2 in Durban. The upper right panel denotes the values observed in latrine no. 3 in Durban. The lower left panel denotes the values observed in latrine no. 1 in Pune. The lower right panel denotes the values observed in latrine no. 2 in Pune.
Unless otherwise indicated, percentages are meant to designate percentages by weight.
As used herein, the terms include or comprise are meant to be non-limiting.
As used herein, the terms malodour receptor antagonist, malodour antagonist system or malodour antagonist ingredient, also referred to as group I is meant to designate one or several compounds that each have the capacity to inhibit at least one olfactory receptor that responds to a malodour target, identified by measuring activity of olfactory neurons or isolated receptors in cultured cell lines whose responses are driven by receptors as described under the examples below.
As used herein, “malodour target” is meant to designate a molecular component of fecal malodour characterized in Lin et al, Environ. Sci. Technol., 2013, 47 (14), pp 7876-7882, including indole, butyric acid, p-cresol, skatole, and dimethyl trisulfide.
As used herein, the term functional perfume accord (referred to as group II) is meant to designate a mixture of at least two perfuming ingredients, referred as functional perfuming ingredients which have been established through e.g. sensory measurement as performing against at least one element of a fecal malodour.
As used herein, the term non-functional perfume accord (referred to as group III) is meant to be a mixture of at least one, alternatively, at least two perfuming ingredients, referred to as non-functional perfuming ingredients that are not performing as fecal malodour counteractant, i.e. perfuming ingredients that are not part of group I or group II .
As used herein, the term perfume or perfume oil or perfume accord are used to designate a mixture of perfuming ingredients.
Moreover, by “perfuming ingredient” it is meant here a compound, which can be used in a perfuming preparation or a composition to impart at least an hedonic effect. In other words such an ingredient, to be considered as being a perfuming one, must be recognized by a person skilled in the art of perfumery as being able to impart or modify in a positive or pleasant way the odour of a composition, and not just as having an odour.
The nature and type of the perfuming ingredients do not warrant a more detailed description here, which in any case would not be exhaustive, the skilled person being able to select them on the basis of their general knowledge and according to intended use or application and the desired organoleptic effect. In general terms, these perfuming ingredients belong to chemical classes as varied as alcohols, lactones, aldehydes, ketones, esters, ethers, acetates, nitriles, terpenoids, nitrogenous or sulphurous heterocyclic compounds and essential oils, and the perfuming co-ingredients can be of natural or synthetic origin.
In particular one may cite perfuming ingredients which are commonly used in perfume formulations, such as:
Perfuming ingredients may not be limited to the above mentioned, and many other of these ingredients are in any case listed in reference texts such as the book by S. Arctander, Perfume and Flavor Chemicals, 1969, Montclair, N.J., USA, or its more recent versions, or in other works of a similar nature, as well as in the patent literature in the field of perfumery. It is also understood that co-ingredients may also be compounds known to release in a controlled manner various types of perfuming compounds.
It has now been surprisingly established that the association of a malodour receptor antagonist system comprising at least one ingredient selected from the group of Table 1 with a functional perfume accord consisting of perfuming ingredients performing against fecal malodour, improves the effect of the functional perfume accord in limiting, decreasing or eliminating the perception of fecal malodour.
A first object according to the present disclosure is therefore the use of a composition comprising:
Ingredient(s) from Table 1 are comprised between 2 and 85 wt % of the composition used according to the present disclosure. According to one aspect, the composition used according to the present disclosure comprises a malodour antagonist system as defined above in an amount comprised between 6 and 70 wt %. According to another aspect, the composition used according to the present disclosure comprises a malodour antagonist system as defined above in an amount comprised between 8 and 60 wt %. According to another aspect, the composition used according to the present disclosure comprises a malodour antagonist system as defined above in an amount comprised between 8 and 46 wt %.
According to a particular aspect of the present disclosure the malodour receptor antagonist system (group I) from the composition used according to the present disclosure comprises at least 3 ingredients selected from Table 1. According to another aspect, at least 4, alternatively, at least 5, alternatively, at least 6, or alternatively, at least 8 ingredients selected from Table 1 are part of the malodour receptor antagonist system.
Group II in the present disclosure is a functional perfume accord as defined above. It is present in amounts ranging from 15 to 98 wt % of the composition used according to the present disclosure. According to one aspect, it is present in amounts ranging from 30-94 wt %. According to another aspect, it is present in amounts ranging from 40-92 wt % of the composition. According to another aspect, it is present in amounts ranging from 29-92 wt % of the composition.
According to a particular aspect, group II consists of ingredients selected from the group consisting of ionones, irones, damascones, citral, citronellol BJ, citronellyl nitrile, lemonile, methylcitral, cinnamic aldehyde, methylcinnamic aldehyde, hexylcinnamic aldehyde, pelargodienal, aldehyde C11 undecylic, aldehyde supra, dodecanal, aldehyde C8, aldehyde C9, aldehyde C12, orivone and mixtures thereof.
According to a particular aspect, group II consists of ingredients from the group of Table 2.
According to a particular aspect, group II consists of selected from the group consisting of ionones, irones, damascones, citral, methylcinnamic aldehyde, pelargodienal, orivone, derivatives and mixtures thereof.
In some aspects, ionones, irones, damascones include damascone alpha, damascone beta, delta damascone, firascone, galione, gamma damascone, irone alpha, irone beta, isoraldeine 70 P, methyionone beta, methylionone gamma Coeur IFF, violet AI, violet AT, and violet BC.
In some aspects, methylcinnamic aldehyde includes alkyl derivatives, including cinnamic aldehyde, methylcinnamic aldehyde, hexythylcinnamic aldehyde. In some aspects, methylcinnamic aldehyde includes alkyl derivatrives, including cinnamic aldehyde, methylcinnamic aldehyde, hexythylcinnamic aldehyde.
According to a particular aspect, the composition used according to the present disclosure comprise a nonfunctional perfume accord as defined above. The nonfunctional perfume accord consists of perfuming ingredients as defined above which are neither part of group II nor part of group I. If present in the composition according to the present disclosure, a non-functional perfume accord can typically be comprised in amounts ranging from 0.5 to 70 wt %, alternatively, from 0.5 to 50 wt % of the composition as defined in any of the above aspects.
Group IV: delivery system
According to a particular aspect, compositions as defined above can be used in combination with a delivery system. The use of a delivery system allows achieving optimal gas-phase concentrations of active ingredients in the composition. Suitable delivery systems for the purpose of the present disclosure include but are not limited to:
Use of a composition as defined in any of the above aspects, wherein the composition further comprises encapsulating materials such as polymers to form microcapsules or microparticles, or materials to form liquid delivery system for the composition such as an emulsion, a microemulsion, a miniemulsion, a gel, a microgel, an anhydrous gel or a dispersion is therefore also an object of the present disclosure.
According to a particular aspect, the composition as defined in any of the above aspects is absorbed on a porous or non-porous substrate in loose powder or compacted form, the substrate being selected from cellulose (paper/cardboard), vermiculite, other industrial absorbents, perlite, calcium carbonate, pumice, wood, sawdust, ground corn cob, ground rice hull, rice hull ash, biochars, starches, modified starches and mixtures thereof.
A second object of the present disclosure consists of a malodour receptor antagonist system consisting of at least 3, alternatively, at least 4 ingredients selected from the group of Table 1.
Another object of the present disclosure is a malodour counteracting composition comprising:
a) from about 2 to about 85 wt % of an active amount a malodour receptor antagonist system comprising at least one, alternatively, at least 3 ingredients selected from Table 1;
According to a particular aspect, the composition comprises from about 6 to about 70 wt % of group I. According to another aspect, the composition comprises from about 8 to about 60 wt % of group I.
According to a particular aspect, the malodour receptor antagonist system comprises (2,5-dimethyl-2,3-dihydro-1H-inden-2-yl)methanol (LILYFLORE®), in an amount of at least 2 wt %, alternatively, at least 3 wt % of the composition.
Without intending to be limited to any particular theory, combinations of ingredients within the malodour receptor antagonist system may exhibit a synergistic reduction or elimination of the perception of fecal malodour. Examples of such malodour counteracting compositions are shown in Example 16 below. Accordingly, in some aspects, the malodour receptor antagonist system comprises (2,5-dimethyl-2,3-dihydro-1H-inden-2-yl)methanol (LILYFLORE®), and the functional perfume accord comprises isoraldeine (alpha-methylionone and isomethyl-alpha-ionone) and α-ionone (also referred to as Violet AT). Alternatively, the functional perfume accord further comprises citral.
Alternatively, in some aspects, the malodour receptor antagonist system comprises (2,5-dimethyl-2,3-dihydro-1H-inden-2-yl)methanol (LILYFLORE®) and (+−)-3,7-dimethyl-1-octen-3-ol (dihydrolinalol), and the functional perfume accord comprises isoraldeine (alpha-methylionone and isomethyl-alpha-ionone), and α-ionone (also referred to as Violet AT).
The present disclosure's composition may be used in any consumer product for which it may be useful to have an MOC activity at least. Consequently, another object of the present disclosure is represented by a MOC consumer product comprising, as an active ingredient, at least one composition according to the present disclosure, as defined above.
The composition can be added as such or as part of a MOC composition (including a delivery system) according to the aspects presented herein.
It is understood that the MOC consumer product, by its nature can also be a perfuming one.
For the sake of clarity, it has to be mentioned that, by “MOC, and optionally perfuming, consumer product” or the similar, it is meant a consumer product which is expected to deliver at least a MOC effect, and optionally also a pleasant perfuming effect, to the surface to which it is applied (e.g. skin, hair, textile, or home surface, but also air). In other words, a consumer product according to the present disclosure is a perfumed consumer product which comprises the functional formulation, as well as optionally additional benefit agents, corresponding to the desired consumer product, e.g. a detergent or an air freshener, and an effective amount of at least one compound or composition from the present disclosure. For the sake of clarity, the consumer product is a non-edible product.
The nature and type of the constituents of the MOC consumer product do not warrant a more detailed description here, which in any case would not be exhaustive, the skilled person being able to select them on the basis of his general knowledge and according to the nature and the desired effect of the product.
Non-limiting examples of suitable perfuming consumer product can be:
It should be appreciated by those skilled in the art that the conception and the specific aspects disclosed might be readily utilized as a basis for modifying or formulating other formulations for carrying the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent formulations do not depart from the spirit and scope of the disclosure as set forth in the appended claims.
The proportions in which the compound according to the present disclosure can be incorporated into the various aforementioned products or compositions vary within a wide range of values. These values are dependent on the nature of MOC consume product and on the desired organoleptic effect as well as the nature of the co-ingredients in a given composition when the compounds according to the present disclosure are mixed with other ingredients, solvents or additives commonly used in the art.
For example, in the case of perfuming compositions, typical concentrations are in the order of 0.01% to 60%, or even 1% to 10%, by weight, or even more, of the composition of the present disclosure based on the weight of the composition into which they are incorporated. Concentrations lower than these, such as in the order of 0.01% to 2% by weight, can be used when these compounds are incorporated into MOC consumer products, percentage being relative to the weight of the consumer product.
In particular, the concentration of MOC compound according to the present disclosure used in the various aforementioned consumer products varies within a various wide range of values depending on the nature of the consumer product.
A non-therapeutic method for counteracting fecal malodour, the method comprising treating a surface or dispensing at least partly in the air a composition as defined in any of the above-aspects is also an object of the present disclosure.
The present disclosure will now be described in further detail by way of the following examples, wherein the abbreviations have the usual meaning in the art and the temperatures are indicated in degrees centigrade (° C.).
In the ex vivo live neuron assay, olfactory sensory neurons (OSNs) are extracted from the olfactory epithelium of mice and can be tested for responses to sequentially delivered stimuli, where responses are detected through live-cell calcium-imaging microscopy. At least 1000 and approximately 5000-10000 OSNs were tested for every compound listed in table 1. It has been established through prior research in the field that the vast majority of extracted OSNs express 1 out of the approximately 1200 odourant receptors (ORs) present in the genome of a mouse, such that in our samples of extracted OSNs, the majority of the 1200 ORs should have been represented in at least one OSN. Since the responses of the OSNs to the delivered stimuli are entirely driven by the expressed OR, the OSNs selectively detect and collectively encode the identity and intensity of odourants. By stimulating the OSNs with MO molecules and measuring the response of each OSN, the subset in which a response is induced is those that detect and therefore presumably encode the MO. By subsequently delivering a mixture of MO and a candidate antagonist to the same cells, the degree of suppression of signal in each MO-responsive OSN can be determined (“level of inhibition”). The degree of inhibition in each cell was binned into one of three groups: low inhibition (10-25%), medium inhibition (25-75%) and strong inhibition (75-100%). In addition, the proportion of MO-responsive OSNs displaying low, medium and high inhibition was calculated. Examples of these data are shown in figures la-d. Compounds that inhibited greater than a minimum proportion of OSNs at a minimum strength were considered antagonist “hits” and putative malodour suppressing compounds. The minimum levels were, respectively, 10% of the population showing strong inhibition and/or 25% of the population showing medium inhibition and/or 40% of the population showing weak inhibition.
The genetic similarity between mouse and human receptors, due to their shared evolutionary history and presumably similar natural odour environments over evolutionary time-scales leads us to suppose that overall observations on MO-responsive populations of mouse ORs should positively correlate with what would be obtained from human ORs, even if individual orthologous receptors (i.e. those believed to share a common ancestor and typically the most similar in genetic sequence) may show varying levels of functional similarity to those from mouse.
Malodour receptor antagonist system and compositions were submitted at a unique gas phase concentration of 3.4 μg/l air.
The sensory method to evaluate compositions requires the use of Firmenich designed air dilution olfactometers to achieve well controlled and stable gas phase concentrations of the compositions and of the malodour to a group of subjects.
The 30 subjects had to evaluate first the fecal reconstitution* alone and then rate the 3 attributes “Freshness”, “Pleasantness” and “Fecal” (the malodour character) on a 0 to 10 scale. The next evaluation occurred 30 seconds later to avoid odour adaptation; the fecal malodour reconstitution was injected together with the tested composition in an olfactometer. Ratings for the same descriptors were recorded. *The model malodour is a fecal reconstitution made of indole, methyl mercaptan, p-cresol and butyric acid. The gas phase concentration of the fecal malodour reconstitution and of its ingredients corresponds to the headspace analytical results from a toilet gas phase sampling (Charles J F Chappuis, Yvan Niclass, Christine Vuilleumier, and Christian Starkenmann Quantitative Headspace Analysis of Selected Odourants from Latrines in Africa and India Environ. Sci. Technol. 2015, 49, 6134-6140)
The results are expressed as the averaged rates for the three descriptors for the fecal reconstitution alone and the fecal reconstitution combined to the tested composition.
It can be seen that a valuable depression of the perception of the fecal reconstitution (residual fecal odour <50%) can be obtained when submitting at the same concentration:
Alias is a floral composition designed without including antagonists from Table 1 and including perfumery ingredients well known to those skilled in the art; however, it has a limited effect on the fecal reconstitution. The fecal score left when combining this composition to the fecal reconstitution is >50%. This demonstrates that the malodour reduction effects are due to the antagonists are specific and not due to simple masking by perfumery ingredients.
The capability of a mixture of a composition according to the present disclosure consisting of
Blind sensory evaluations were organized; no information was disclosed to the 31 participants on the randomized submitted odourous stimuli. The test was duplicated and the observations accumulated.
Following tables represent compositions according to the present disclosure.
The sensory method to evaluate compositions described under example 4 required the use of Firmenich designed air dilution olfactometers to achieve well controlled and stable gas phase concentrations of the compositions and of the malodour to a group of subjects.
The 30 subjects had to evaluate first the fecal reconstitution alone and then rate the same descriptors as expressed previously on a line scale. The next evaluation occurred 30 seconds later to avoid odour adaptation; the fecal malodour reconstitution was injected together with the tested composition in an olfactometer. Ratings for the same descriptors were recorded.
The results are expressed as the averaged rates for the three descriptors for the fecal reconstitution alone and the fecal reconstitution combined to the tested composition.
Illustration: The graphs (
The number and the % in weight of ingredients from Classes I (antagonist system), II (Functional perfume accord) and III (nonfunctional perfume accord) are indicated.
All these compositions are tested at 3 decreasing concentrations C1, C2 and C3.
The lower the fecal score, the more performing the antagonizing composition.
The dotted lines on the 3 graphs give the scores for the 3 attributes when evaluating the Floral RD, the Citrus H or the Jasmin E alone at C1 concentration (not combined to the fecal reconstitution). The three graphs indicate the minimum that may be expected for the Fecal score and the maximum scores for Freshness and Pleasantness.
The fecal score for Floral RD, Citrus H or Jasmin E evaluated alone at C1 concentration is not statistically different from the Fecal score of these compositions also tested at C1 concentration and combined to the fecal reconstitution (attested by Student's test, 99% confidence).
The air freshener device used in this example was a cellulose air freshener-type. These air fresheners comprise of an absorbent material infused with a specified amount of fragrance. This material is then placed in a container to control the delivery of the fragrance composition. For this example, a cellulose pad is used as the absorbent material placed in an aluminum tin.
Test samples were prepared by applying 3 grams of fragrance compositions onto cellulose pads (2.5 in.2) that were placed in round aluminum tins (3 in. diameter). The fragrance compositions used for this test were “Floral V” (Example 6), two samples of “Citrus B2” (Example 6) and “Jasmine E” (Example 6).
A synthetic latrine malodour formulation was prepared as follows:
A 70% by weight latrine malodour loaded vermiculite was prepared by admixing 350 g of the latrine malodour with 150 g of vermiculite (Fine grade, Specialty Vermiculite Corp, Enoree, S.C.).
The efficacy of the cellulose-based air fresheners comprising fragrance formulations according to the present disclosure was assessed following the practices described in ASTM E 1593-06 “Method for Assessing the Efficacy of Air Care Products in Reducing Sensorialy Perceived Indoor Air Malodour Intensity”. Six 72 ft3 evaluation cabins with smelling windows within their doors were used for the sensory evaluation of samples. Five cabins contained a 3 inch diameter aluminum tin with 9 grams of the latrine malodour loaded vermiculite; one cabin contained a 3 inch diameter aluminum tin with 9 grams of vermiculite (without malodour).
One of the cabins containing the malodour only (no test product) was identified as a reference; the other five cabins were labeled with randomly generated 3 digit codes. The cabins set-up was as follows:
The cabins were assessed by 21 untrained but experienced assessors. By “untrained but experienced assessors” we mean individuals who have not received formal olfactive training but who are used to participating in fragrances assessments and have experience in rating the odour attributes.
The environmental conditions in the cabins during the test were 72° F., 35% RH with 5 air changes per hour. A portable desk fan, set on low, was placed at the floor of the cabin to circulate the air within. All assessors were first instructed to smell the odour in the reference cabin, in order to familiarize themselves with the malodour. They were then instructed to smell the odour in the test cabins and rate the intensity of the malodour using a 1 to 7 category scale, where 1 indicates no perceivable malodour and 7 indicates very strong malodour. Presentation of the test cabins was blind, balanced, randomized, and sequential monadic. Assessors were directed to open the smelling window to evaluate each sample and wait for 60 seconds before proceeding to the next.
Data was analyzed using one-way analysis of variance (ANOVA), followed by Fisher's least significant difference (LSD) method for multiple comparisons (α=0.05). The number of assessors (N) and the LSD were as follows: N=21, LSD=0.60. Mean malodour intensity of the cabins is shown in on
The perceived malodour intensity of the Citrus B2 Only cabin (no malodour) is significantly lower than that of all other cabins. The perceived malodour intensity of the cabins containing malodour and fragrance compositions according to the present disclosure is significantly lower than that of the malodour only cabin; thus, cellulose air fresheners comprising fragrance compositions according to the present disclosure are useful in reducing the perception of latrine malodour.
Example 8
The air freshener device used in this example was a candle; such devices deliver fragrance by two means. First, fragranced incorporated into the candle will evaporate slowly as it migrates through the wax and onto the surface of the candle. The second means, by far greater, is through the “melt pool”. The melt pool is generated while the candle is lit and the flame melts portions of the candle forming a pool at the top. The warm mixture delivers fragrance at a greater rate.
The fragrance compositions used for this test were “Floral RD” (Example 4), two samples of “Citrus H” (Example 4) and “Jasmine E” (Example 6). The fragranced candles were prepared by mixing the aforementioned fragrance compositions with the candle formula indicated in the table below. 100 grams of the wax mixture was then placed in a 3 in. tall, round, glass container with a 3 in. diameter and a wax-coated, felt wick (CD# 6, clipped to a 0.5 in. height). For the test sample containing malodour only, a candle without fragrance was prepared (Candle wax 4625A IGI at 88%).
The malodour preparation and test procedure was the same as outlined in Example 6. The cabins were assessed by 15 untrained but experienced assessors. Data was analyzed using one-way analysis of variance (ANOVA), followed by Fisher's least significant difference (LSD) method for multiple comparisons (α=0.05). The number of assessors (N) and the LSD were as follows: N=15, LSD=0.70. Mean malodour intensity of the cabins is shown in
The perceived malodour intensity of the Jasmine E Only cabin (no malodour) is significantly lower than that of all other cabins. The perceived malodour intensity of the cabins containing malodour and fragrance compositions according to the present disclosure is significantly lower than that of the malodour only cabin; thus, candles comprising fragrance compositions according to the present disclosure are useful in reducing the perception of latrine malodour.
The air freshener device used in this example was an aerosol; such devices deliver fragrance into an environment by means of a pressurized aqueous fragranced solution.
The fragrance compositions used for this test were “Floral V” (Example 6), two samples of “Citrus B2” (Example 6) and “Jasmine E” (Example 6). The fragranced aerosols were prepared by mixing fragrance compositions with the aerosol formula indicated in the table below.
The malodour preparation and test procedure was the same as outlined in Example 6. The cabins were assessed by 19 untrained but experienced assessors. Data was analyzed using one-way analysis of variance (ANOVA), followed by Fisher's least significant difference (LSD) method for multiple comparisons (α=0.05). The number of assessors (N) and the LSD were as follows: N=19, LSD=0.70. Mean malodour intensity of the cabins is shown in
The perceived malodour intensity of the Jasmine E Only cabin (no malodour) is significantly lower than that of all other cabins. The perceived malodour intensity of the cabins containing malodour and fragrance compositions according to the present disclosure is significantly lower than that of the malodour only cabin; thus, aerosol air fresheners comprising fragrance compositions according to the present disclosure are useful in reducing the perception of latrine malodour.
The air freshener device used in this example was a sachet-type air freshener; such devices utilize a particulate substrate, infused with fragrance contained in a permeable pouch, the pouch being formed from paper, woven fabric or non-woven material.
The fragrance compositions used for this test were “Floral V” (Example 6), two samples of “Citrus B2” (Example 6) and “Jasmine E” (Example 6). The fragranced sachets were prepared by mixing the fragrance compositions with ground corn-cob particles (NatureZorb®-100, origin: Aproa) at 20% loading by weight. 12 grams of the resulting mixtures were then placed in a 2.5 inch×2.5 inch paper pouch. A sample comprising un-fragranced corn-cob was prepared for the malodour only cabin.
The malodour preparation and test procedure was the same as outlined in Example 8. The cabins were assessed by 21 untrained but experienced assessors. Data was analyzed using one-way analysis of variance (ANOVA), followed by Fisher's least significant difference (LSD) method for multiple comparisons (α=0.05). The number of assessors (N) and the LSD were as follows: N=21, LSD=0.62. Mean malodour intensity of the cabins is shown in
The perceived malodour intensity of the Jasmine E Only cabin (no malodour) is significantly lower than that of the malodour only cabin and Floral V+malodour cabin. The Jasmin E+Malodour cabin and Citrus B2+Malodour cabins were not perceived to be significantly stronger in malodour intensity than the cabin with no malodour, demonstrating how effective these two compositions are reducing the perception of latrine malodour. The perceived malodour intensity of the cabins containing malodour and fragrance compositions according to the present disclosure is significantly lower than that of the malodour only cabin; thus, sachet-type 1 air fresheners comprising fragrance compositions according to the present disclosure are useful in reducing the perception of latrine malodour.
The air freshener device used in this example was an electric-wick air freshener; such devices utilize a heating element to drive fragrance composition from a wick inserted into a reservoir with the fragrance.
The fragrance compositions used for this test were “Floral RD” (Example 4), two samples of “Citrus H” (Example 4) and “Jasmine E” (Example 6). The fragrance compositions were mixed with equal parts by weight Augeo Clean Multi (Solvay). 20 grams of the resulting mixtures were then placed in reservoirs with wicks (sintered plastic). The heater units used were designed to heat the wick to 70° C.
The malodour preparation and test procedure was similar to that outlined in Example 8. However, in this example the test cabins comprised a volume of 812 ft3 and assessors assessed the odour by entering each cabin. Other details were as previously described. The cabins were assessed by 23 untrained but experienced assessors. Data was analyzed using one-way analysis of variance (ANOVA), followed by Fisher's least significant difference (LSD) method for multiple comparisons (α=0.05). The number of assessors (N) and the LSD were as follows: N=23, LSD=0.56. Mean malodour intensity of the cabins is shown in
The perceived malodour intensity of the Jasmine E Only cabin (no malodour) is significantly lower than that of the malodour only cabin and Floral RD+malodour cabin. The Jasmin E+Malodour cabin and Citrus H+Malodour cabins were not perceived to be significantly stronger in malodour intensity than the cabin with no malodour, demonstrating how effective these two compositions are reducing the perception of latrine malodour. The perceived malodour intensity of the cabins containing malodour and fragrance compositions according to the present disclosure is significantly lower than that of the malodour only cabin; thus, liquid electrical-type air fresheners comprising fragrance compositions according to the present disclosure are useful in reducing the perception of latrine malodour.
The malodour reduction of fragrance composition described by the present disclosure was measured in a bleach cleaning powder.
The bleach cleaning powder is a bleach powder combined with spray-dried fragrance. Standard usage of this product is to apply the powder to the area to be treated and dissolved with water, followed by scrubbing to loosen all particles and then rinsed.
Fragranced bleach samples were prepared by adding 0.15 grams of spray-dryed powder (comprised of 50% w/w perfume, 50% w/w octenyl succinated modified starch) to 9.85 grams of Stable Bleaching Powder (Grade I, Gujarat Alkalies and Chemicals Limited, Gujarat, India).
The malodour composition detailed in Table 1 was applied onto fine vermiculite (Specialty Vermiculite Corp, Enoree, S.C.) with a 70% loading by weight. 9 grams of the composition was then presented to assessors in round aluminum tins. The aluminum tins have a 3 in. diameter with a 1 in. height. For the test sample with fragrance only, a tin with untreated vermiculite is used.
A 70% by weight latrine malodour loaded vermiculite was prepared by admixing 350 g of the latrine malodour with 150 g of vermiculite (Fine grade, Specialty Vermiculite Corp, Enoree, S.C.). The efficacy of the cellulose-based air fresheners comprising fragrance formulations according to the present disclosure was assessed following the practices described in ASTM E 1593-06 “Method for Assessing the Efficacy of Air Care Products in Reducing Sensorialy Perceived Indoor Air Malodour Intensity”. A booth labeled “Reference” containing only a malodour tin was presented to assessors first to familiarize them with the malodour. Using a scale of 1 to 7 (1 signifying no odour, 4 moderate odour and 7 extremely strong malodour), assessors were then asked to evaluate each sample in specified order and rate malodour intensity and total odour intensity.
The samples were assessed by 19 untrained assessors. By “untrained assessors” we mean users of air fresheners who have not received formal olfactive training but who are used to participating in fragrances assessments and have experience in rating the odour attributes.
Using 60 ft3 evaluation rooms, the floors of the cabins were wet with water and samples were scrubbed onto the floors until dissolved. The malodours were then added. The environmental conditions during the test were 72 F, 40% RH with 5 air changes per hour. A portable desk fan, set on low, is placed at the floor of the cabin to circulate the air within. Booths were labeled with a randomly generated 3 digit code. Sample presentation was blind, balanced, randomized and sequential monadic. After 5 minutes from activation, assessors were directed to open the smelling window to evaluate each sample and wait for 60 seconds before proceeding to answer a series of questions relating to the odour they perceived in the room. The assessors were asked to rate the malodour strength and total odour intensity. Data was analyzed using Analysis of Variance (ANOVA) and the difference between two means determined using the least significant difference (α=0.05). Mean malodour intensity of the cabins is shown below; the least significant difference between means was 0.61.
Results are shown in
The perceived malodour intensity of the Floral RD+Bleach Only cabin (no malodour) is significantly lower than that of the malodour only cabin. The Floral RD+Bleach+Malodour cabin was not perceived to be significantly stronger in malodour intensity than the cabin with no malodour, demonstrating how effective this composition is at reducing the perception of latrine malodour. The perceived malodour intensity of the cabin containing malodour and Floral RD composition according to the present disclosure is significantly lower than that of the malodour only cabin; thus, bleach cleaning powders comprising fragrance compositions according to the present disclosure are useful in reducing the perception of latrine malodour.
In this example, in order to evaluate performance of compositions according to according to the present disclosure, a model latrine was constructed. The model latrines were equipped with an odour generator that injected hydrogen sulfide, methyl mercaptan, butyric acid, para-cresol, and indole, allowing the accurate and reliable reconstitution of a toilet malodour headspace. The malodourant concentrations in the model latrines matched the quantitative headspace analysis made in African and Indian toilets. The toilet malodour headspace performances were validated by chemical and sensory analysis. Olfactory stimuli were presented to participants in different climates to assess the effect of climate on the perception of odours. The sensory data showed that increasing temperature and humidity decreased the intensity ratings of malodours but not their quality. Perfume formulations can be delivered in these model latrines by forced evaporation to control the headspace concentration or by delivery systems such as cellulosic pads, liquids, and powders. Our experimental setup provided dose-response curves to assess the performance of perfume formulations in reducing toilet malodour and increasing pleasantness.
The compounds triethylamine, N-ethylmaleimide (NEM), and methyl octanoate were purchased from Sigma-Aldrich (Buchs, Switzerland), and butyric acid, p-cresol, indole, and L-cysteine were in-house products. The solvents diethyl ether, methanol, ethyl acetate, and acetone were purchased from Carlo Erba (Val de Reuil, France). For methyl mercaptan and hydrogen sulfide, nitrogen mixtures at 15 ppm (v/v) were used, in pressurized cylinders purchased from Carbagas (Carouge, Switzerland). Oasis HLB 1-g cartridges were purchased from Waters (Montreux-Chailly, Switzerland). The perfume formulation used in this example is described below.
Three 1.7 m3 model latrines (1.95 m×0.985 m×0.89 m) made of 8-mm transparent polyethylene terephthalate were placed in a climate chamber, and each latrine was equipped with a 29 cm×39 cm rotating door to allow evaluation of odours (
To force the evaporation of liquids, we modified the lower chamber of a publically available olfactometer. A 150 L/h nitrogen flow flushed a 500-ml round-bottom flask, where liquids were introduced via a polytetrafluorethylene (PTFE) capillary linked to a 1-ml polypropylene syringe (
The climate chamber dimensions were 3.42 m×2.95 m×2.5 m, resulting in a volume of 25 m3. The temperature and humidity of the climate chamber was controlled in a closed cycle of 540 m3/h. Fresh air entered the chamber at a rate of 51 m3/h and air left the chamber at the same rate. The working range for temperature and relative humidity (RH) was 12° C. to 45° C. and 30% RH to 90% RH, respectively. The climate chamber was equipped with temperature and RH probes placed at the entrance and outlet of the temperature and humidity controlling cycle. The data from the probes at the entrance were recorded every 5 min, allowing the measurement of temperature and RH of the air inside the climate chamber during the experiments. Moreover, a proble was placed (Traceable® hygrometer, VWR International, Radnor, Pa., USA) inside the latrine to punctually measure the RH and temperature to ensure that the differences in temperature and RH between the air inside the climate chamber and the air inside the latrines was minimal. A temperature difference below 1.5° C. and a RH difference below 5% was mainteind.
The participants were employees from the research center at Firmenich SA (Geneva, Switzerland). Ten sessions were organized and the number of participants for each session was as follows: 26, 24, 26, 27, 26, 30, 25, 27, 25, 23. The participants signed a consent form before participating in the study. The consent form and experimental protocol were approved by the internal review board of Firmenich in agreement with the Declaration of Helsinki for medical research involving human subjects.
The participants were exposed to six odourant mixtures delivered in latrines in four different climates. The odourant mixtures were Mukuru (Nairobi) UDT malodour alone, the perfume (Floral D) alone, and mixtures of the malodour and the perfume released at four different concentrations (0.18, 0.54, 1.62, 4.9 μg/l).
The malodour was reconstituted from Mukuru toilets because it contains all of the significant molecules and it came from well-maintained toilets. The Mukuru malodour source was composed of hydrogen sulfide, methanethiol, butyric acid, p-cresol, and indole, whose gas phase concentrations were 0.26, 0.018, 0.004, 0.0027 and 0.00018 μg/l, respectively. Hydrogen sulfide and methanethiol were released from pressurized cylinders at 20.8 l/h and 9.8 l/h, respectively. The remaining malodour products were released in the latrines by forcing the evaporation of a propylene glycol solution that contained 0.775, 0.526 and 0.035 mg/ml of butyric acid, p-cresol and indole, respectively. The perfume formulation was released in pure form in the forced evaporation chamber, resulting in a gas phase concentration of 4.9 μg/l. The lower gas phase concentration of the perfume was achieved by diluting it in propylene glycol. The gas phase concentrations of 0.18, 0.54 and 1.62 μg/l were obtained with 3.62%, 11.13% and 33.31% (w/w) propylene glycol solutions, respectively. To release the malodour and the perfume in the same latrine, two syringes via two PTFE capillaries were connected to the same forced evaporation chamber. One syringe contained the malodour solution and the other syringe contained the perfume formulation, either in pure form or diluted in propylene glycol. Both syringes were mounted on the same syringe pump and their pistons were pushed at 0.088 mm/h, resulting in a release rate of 0.088 ml/h. When the malodour or the perfume was presented alone, pure propylene glycol was injected into the forced evaporation chamber with the second syringe. Each odour was presented in four climates: 22° C. at 30% RH, 22° C. at 80% RH, 35° C. at 30% RH, and 35° C. at 80% RH.
The participants were randomly exposed to the odour stimuli in the different climates. As only three latrines were available, the six odours were split into two groups, each containing the malodour alone or the perfume alone, the malodour plus a low dose of perfume, and the malodour plus a high dose of perfume. The first and the last sessions were used as controls to assess the reliability of the panel and were composed of the malodour alone, the perfume alone, and a mixture of both. The participants entered the climate chamber and directly evaluated the odour of the three latrines by answering a paper questionnaire made with the software FIZZ (Biosystems, Courtenon, France). They reevaluated the odour of each latrine after a 3-min adaptation to the climate. They were asked to rate, on 0-10 linear scales, the pleasantness from “I don't like” to “I like,” the familiarity from “not familiar” to “very familiar,” the intensity from “no odour” to “very strong,” the fecal/toilet character from “not fecal/toilet” to “very fecal/toilet,” and whether they wanted to enter the latrine from “not at all” to “very willingly.”
The Mukuru malodour was released in the model latrines as described above. The climate was set to 25° C. at 50% RH. The compounds released into the air were collected with Oasis cartridges conditioned with 20 ml of deionized water, 20 ml of methanol, 20 ml of acetone, and 20 ml of diethyl ether and dried at 50° C. for 1 h in an oven. Hydrogen sulfide and methyl mercaptan were derivatized with NEM in Oasis cartridges loaded with 2 ml of diethyl ether containing 25 mg NEM and 100 μ1 of triethylamine and dried for 1 h at 50° C.
The air was pumped at 1 l/ min through the cartridges by using GilAir Plus pumps connected with silicon tubes. The volume of the samples was 100 l. Three cartridges were used to sample the air of one latrine. One cartridge was placed in the center of the model latrines, the second 23 cm from the evaluation door, and the third deep at the top right of the latrine (171 cm from the ground). The cartridges were desorbed with 10 ml of diethyl ether added to 100 μl of 10 ng/μl methyl octanoate (internal standard [IS]) solution in ethyl acetate. To remove the excess NEM, the eluate was washed with 3 ml of 10 mg/ml of L-cysteine solution in water buffered at pH 8 with 0.1 M potassium phosphate. The water phase was removed and the organic phase dried with sodium sulfate. The water phase was acidified with 100 μl of a 37% HCl solution in water; butyric acid was extracted with 4 ml of diethyl ether added to 100 μl of IS. Prior to injection in the GC-MS, both organic phases were gently concentrated to 1 ml under argon flow. The analysis was performed by injecting 1 μl of the eluate into the GC-MS as described below.
Using an olfactometer, a headspace was created with known concentrations of butyric acid, indole, p-cresol, methyl mercaptan, and hydrogen sulfide to calibrate the analytical method. Briefly, air with known amounts of compounds was sampled with Oasis cartridges loaded with the derivatization agent NEM (described above) at the outlet of the olfactometer.
Methyl mercaptan and hydrogen sulfide were released into the olfactometer from pressurized cylinders containing a mixture of 15 ppm of both sulfur compounds in nitrogen. The flow of both sulfur compounds was controlled with rotameters (Vogtlin TV 100). Butyric acid, indole, and p-cresol were released by forcing the evaporation of propylene glycol solutions from a 1-ml polypropylene syringe mounted on a syringe pump delivering 0.101 ml/h. The solution was introduced into the lower chamber, which was heated to 150° C. by using an oil bath. Nitrogen was introduced into the lower chamber at 60 l/h to collect the products that evaporated and was mixed with the airflow of the upper chamber. The airflow was set at 540 l/h and humidified by bubbling in a water-jacketed wash bottle filled with distilled water. The upper chamber of the olfactometers was water jacketed and its temperature was maintained at 29° C. with a water bath. At the outlet of the olfactometers, the temperature was 30° C. and the RH was 40%. The resulting concentrations of methyl mercaptan and hydrogen sulfide compounds in the olfactometer were 0.1, 0.05, 0.0250 and 0.0125 μg/l. The resulting concentrations of butyric acid, p- cresol, and indole were 0.0001, 0.001, 0.01 and 0.1 μg/l.
A GC 6890 N (Agilent, Palo Alto, Calif., USA) was used to identify the compounds. A fused silica SPB-1 capillary column (30 m×0.25 mm i.d., 0.25-μm film thickness, Supelco, Bellefonte, Pa., USA) was mounted in the GC. The carrier gas was He (52 kPa) and the injector temperature was set at 250° C. Injections were made with a Combi-Pal autosampler (Zwingen, Switzerland). To analyze butyric acid, p-cresol, indole, and NEM derivatives of methyl mercaptan and hydrogen sulfide, the initial oven temperature was held at 50° C. for 5 min and then increased at 5° C./min to 250° C., split mode 1/5. The GC was coupled to a MS 5975B Inert XL MSP from Agilent. The mass spectra in the electron impact mode were measured at 70 eV in SIM mode. The ions that were monitored were butyric acid (60), p-cresol (107), indole (117), NEM-S-CH3 (127), and NEM-S-NEM (127).
The questionnaires were scanned and the data stored in FIZZ and analyzed with R (https://cran.r-project.org). The response variables—pleasantness, enter the latrine, intensity, familiarity, and fecal character—were analyzed by using analysis of variance (ANOVA), and any significant effect was confirmed with the non-parametric Kruskal-Wallis test. Pairwise comparison tests were made with the Tukey honest difference test (Tukey HSD function in R). The relationship between the pleasantness of the different odour treatments and the willingness to enter the latrines was investigated with linear models. Moreover, pleasantness ratings from odour treatments and pleasantness ratings from the climates were analyzed with linear models. The level of significance was set at P<0.05. To determine the concentrations of malodour compounds in the gas phase of the model latrines, calibration curves were established by using linear models on the ratio of the peak area of volatiles and IS as a function of the gas phase concentrations in the olfactometer. Using these calibration curves and the inverse prediction function in R (chemCal package), the gas phase concentrations inside the model latrines were predicted from the ratios of peak area of volatiles and IS.
Three toilet models of 1.7 m3 were built in a climate chamber of 25 m3. Each toilet had 10 air changes per hour. Inside the toilets, a scale was installed to monitor weight gain or loss of and hard surfaces to receive liquids or powders. When the subjects stepped into the climate chamber, they were exposed to the temperature and humidity set up for the experiment; therefore, for the present study, they were asked to make a first evaluation of the odour directly after entering the chamber and to make a second evaluation after a few minutes of adaptation to the climate. Adaptation had no significant effect on the criteria used to evaluate the odour. The data with and without adaptation were then averaged.
A typical Mukuru fecal toilet malodour was created through a controlled release of methanethiol, hydrogen sulfide, butyric acid, p-cresol, and indole by spraying the gas and vaporizing the liquids in a hot chamber flushed with nitrogen (
Four descriptors were proposed to the subjects: pleasantness, enter the toilet, fecal character and intensity. The panel was reliable, as the results obtained with the panel when we repeated the first and last sessions are not significantly different (
The climate significantly affected the intensity, but had no significant effect on the other criteria of pleasant, familiarity, fecal character, and willingness to enter the latrines. The increase in temperature significantly decreased the overall intensity (ANOVA, P<0.0001; Kruskal-Wallis, P<0.001) independently of the odour (
Next, the appropriate control was evaluated. The choices were: the malodour (blue bars,
As opposed to the direction of the fecal character ratings, the pleasantness ratings increased significantly as a function of increasing concentrations of perfume (
A similar result was obtained with the ratings of willingness to enter the latrines compared with the pleasantness ratings. Ratings of willingness increased significantly as a function of increasing perfume concentrations. The willingness to enter the latrine was strongly correlated to those of pleasantness (
The climate chamber was set for four climate conditions: 22° C. at 30% RH, 22° C. at 80% RH, 35° C. at 30% RH, and 35° C. at 80% RH. The temperature and RH conditions were reached by using the temperature controlling system (Table 15). The temperature and the RH inside the climate chamber and inside the model latrines were less than 1.5° C. and 5%, respectively (Table 15).
Without intending to be limited to any particular theory, the performance of the compositions may be influenced by factors, such as, for example, the volatility of the compound in the formulation, the temperature, airflow, the depth of the boundary layer, the interactions of the compounds with the substrate of the passive delivery system, the interactions between the compounds, the concentrations of each compound in the delivery system, climate, and the like. Such factors may influence the influence the duration and/or the magnitude of the perceived reduction in fecal malodour, and/or the duration and/or the magnitude of changes in other sensory effects, such as, for example, an increased in perceived pleasantness.
To explore this further, in this example, the performances of compositions according to some aspects of the present invention were evaluated in latrines, where the compositions were incorporated into passive delivery systems. In a first series of experiments using a model system, the following two formulations were tested: Floral V (as described in Table 10), and Jasmin E (as described in Table 9). A panel of 19 to 32 participants was trained on-site to evaluate the performance of the test compositions over a period of 10 days. The headspace of the model latrines were also sampled and analyzed to determine the gas phase concentration of perfume ingredients in the latrines.
Panelists were exposed to the odour of the three model latrines. The odour of two latrines were composed of perfumes Jasmin E and Floral V released from cellulosic pads in addition to the malodour Mukuru reconstitution delivered by forced evaporation systems as described in the previous example. The odour of the third model latrine was composed of the malodour alone in addition the blank cellulosic pad. The Cellulosic pads were 10.8 cm×7.3 cm×0.15 cm, and were loaded with 2.2 g of a mixture of 60% perfume oil and 40% isopropyl myristate (IPM). The pads were placed on a scale that equipped each latrine. The scales were connected to a computer to monitor every 5 min the loss of mass of each pad. Time of implementation of the pads was time 0. Sensory analysis and headspace analysis were conducted according to the methods described in the previous example.
Referring to
The performance of the formulations tended to decrease as a function of time at 25° C., and clearly decreased at 40° C. For Floral V, the pleasantness dropped under the neutral limit (5) to reach the negative valence (I don't like) after 10 days at 25° C., and after 4 days at 40° C. In fact, an inversion between the pleasantness and the fecal character was observed. The Jasmine E formulation demonstrated a better performance in both climates as the pleasantness remained in the positive valence (I like) during the survey and the fecal character ratings were lower than those observed with the Floral V formulation. Unlike the Floral V formulation, no inversion was observed for the Jasmine E formulation. Fluctuations were not related to the malodour, as the associated ratings were remarkably stable over time.
Analysis of the headspace of the test latrines revealed the variations of the gas phase concentration for all the compounds of the Floral V formulation and for selected compounds for the Jasmin E formulation.
Referring to
Violet AT and Isoraldeine 70P demonstrated similar decreases in headspace concentration. Here, their gas phase concentrations were stable at 25° C. whereas, at 40° C., they started higher and decreased faster.
LILYFLORE® was stable over the period of experiments but in higher concentration at 40° C. compared to 25° C. Here, these data suggest, an increment of temperature helped to release LILYFLORE®. All the antagonist compounds except Dihydrolinalol were in percievable amount in the air over the period of experiments.
Using the performance Floral V formulation at 40° C. as an example, referring to Table 17 below, at Day 0, when the performance of the formulation was greatest (for both fecal malodor reduction and an increased perception of pleasantness), the headspace concentration of most of the ingredients were at or above the effective antagonist concentration for at least one malodour target. At day 2, the headspace concentration of the ingredients declined, with only one ingredient being at or above the effective antagonist concentration for at least one malodour target. Four ingredients were close to the effective antagonist concentration for at least one malodour target, and seven ingredients were below the effective antagonist concentration for at least one malodour target. A corresponding decline in performance of the formulation was observed (
In another study using latrines in Durban (South Africa), and Pune (India), the performances of the following two formulations were tested: Floral V Jasmin E and Citrus 259389 B (as described in Table 8). The formulations were incorporated into cellulose pads. The panel of participants were trained on-site to evaluate the performance of the test compositions over a period of 3 days. The headspace of the latrines were also sampled and analyzed to determine the gas phase concentration of perfume ingredients in the latrines.
Odour evaluation was performed by 11 subjects. The test formulations were diluted in isopropyl myristate (IPM; 60% oil, 40% IPM) and loaded on plain cellulose pads (10.8 cm×7.3cm×0.15 cm) at 42% w/w dry substrate. One to two pads were used per latrine according to the resulting intensity of the perfume when implemented. We used three latrines (three replicates) per formulation in both countries. In Durban, Jasmin E and Floral V were implemented in six private and individual ventilated pit-latrines and Citrus 259389 B (as described in Table 7) was implemented in three ventilated improved pit-latrines of a community ablution block. In Pune, each test formulation was implemented in three toilets of a dedicated ablution block.
The subjects evaluated the olfactory stimuli with our web-questionnaire developed in house and available on the internet at the following link: http://www.pacchiani.ch/firmenich/. They were asked to rate on a linear scale (from 0 to 100), the pleasantness from “I don't like” to “I like”, the intensity from “no odour” to “very strong”, the fecal character from “not fecal” to “very fecal”. They were able to add comments at the end of the questionnaire.
The odour of the latrines was evaluated before and after the implementation of the pads. A first evaluation was performed in the afternoon to establish the baseline. The pads were then implemented and a second evaluation was performed 10-30 min after the implementation. A third and a fourth evaluation was performed in the morning the next days after the implementation. For the evaluation, the participants were asked to enter the toilet one by one. The toilets were used as usual.
Headspace Analysis: The day following the implementation of the test formulations, the air of two toilets treated with the test formulations was sampled. The air was pumped at 1 L/min through OASIS HLB 1 g cartridges that were suspended to the walls of the latrines. One cartridge was placed near the ground at 0.15-0.3 m height and a second one was placed at 1.5-1.7 m height. The total volume pumped was 87 L to 100 L. The analysis and the quantifications were achieved according the standard protocols. To determine whether the test formulations changed significantly the pleasantness and the fecal character ratings, the Wilcox signed-rank test was used on the data of each toilet comparing the ratings before and after the implementation of the test formulations. The data obtained from the evaluations performed after the implementation, were pooled. Data of evaluations coming from toilets where the pad was stolen, displaced or removed were discarded.
Referring to
The fecal malodour observed was not constant across all the latrines tested. For example, in Pune, the level of the fecal malodour was very low and more similar among the pool of latrines compared to the fecal malodour observed in the latrines tested in Durban (
In Pune, the test formulations were implemented in three public ablution blocks composed of about 10 flush toilets. They were well maintained and cleaned several times a day. The ventilation was insured by opened windows in each toilet. In contrast, the latrines in Durban were dirty individual pit-latrines that were poorly maintained. For some latrines the pit was full and the ventilation port was missing. This can explain the variability of the malodour level in the different toilets. Examples are latrine N°2 treated with Jasmin E and in latrine N°1 treated with Floral V, the formulations hardly increased the average pleasantness that was not stable in time (
Analysis of the headspace of the latrines revealed that the MOC molecules α-ionone, isoraldeine, LILYFLORE®, dihydrolinalol were found in significant amounts in the air sampled in Pune and in Durban. The gas phase concentrations detected exceeded their respective olfactory detection thresholds (ODT) determined in separately, namely: 5.08×10−4, 1.92×10−4, 1.28×10−4, 1.37×10−3 μg/L, respectively (
The headspace analysis shows a certain degree of homogeneity despite the lack of airflow control. The exception of toilet N° 3 may be explained by the fact that the cartridge at high height was too close from the pad during the sampling. Moreover, the gas phase concentrations were similar across both countries. However, two pads per toilets were used in Pune, suggesting that the ventilation rate was higher in Pune than in Durban.
The analysis revealed also that the profile of compounds concentrations obtained on the field were similar to that found in the model latrines at a similar temperature (
Taken together, these data demonstrate a correlation between model latrines and field latrines, validating a step further the use of model latrines to make experiments in controlled conditions. Moreover, The Jasmine E formulation appeared to perform longer than the Floral V formulation in suppressing the toilet malodour reconstitution at 25° C. and 40° C. Headspace analysis revealed that the gas phase concentrations of MOC compounds were similar comparing both perfumes and that top note compounds are not involved in the suppression of the malodour, challenging their presence in those formulations.
Formulations containing antagonists of fecal malodour (Jasmine E, Floral V, Citrus 259389 B) increased the pleasantness of toilets odour by decreasing the fecal character in different and challenging environments. However, the limit of performance was reached in dirty toilets with no ventilation and pit full, environments that are not targeted in this study. Furthermore, the MOC were in a significant amount even in challenging environment and that the suppression effect of the fecal character was not due to perfume overpowering the malodour.
The performance of a test formulation containing LILYFLORE®, Violet AT and Isoraldeine to counteract the fecal malodour perceived from a fecal malodour reconstitution was tested. The amount of each single ingredient in the test formulation was the same as the corresponding concentration of the ingredient that was incorporated into the Floral compositions. Separate control formulations were also included, comprising LILYFLORE®, Violet AT and Isoraldeine separately, at the same concentration as each single ingredient in the test formulation. The sensory evaluation was blind, and performed using olfactometers and a set of more than 30 participants evaluating blind. In parallel, the headspace concentration of the ingredients from the test and three control formulations was determined. The results are shown in Table 18 and
Taken together, these data demonstrate that the test formulation comprising a mixture of LILYFLORE®, Violet AT and Isoraldeine was better at reducing the fecal score, and therefore the perception of fecal malodor, and also increasing the pleasantness and freshness score, compared to control formulations containing the single ingredients tested at their same concentration within the mixture.
The performance of another test formulation containing LILYFLORE®, Violet AT and dihydrolinalol to counteract the fecal malodour perceived from a fecal malodour reconstitution was tested. Separate control formulations were also included, comprising LILYFLORE®, Violet AT and dihydrolinalol separately, at the same concentration as each single ingredient in the test formulation. The sensory evaluation was blind, and performed using olfactometers and a set of more than 30 participants evaluating blind. In parallel, the headspace concentration of the ingredients from the test and three control formulations was determined. The results are shown in Table 19 and
Taken together, these data demonstrate that the test formulation comprising a mixture of LILYFLORE®, Violet AT and dihydrolinalol was better at reducing the fecal score, and therefore the perception of fecal malodor, and also increasing the pleasantness and freshness score, compared to control formulations containing the single ingredients tested at their same concentration within the mixture.
The performance of another test formulation containing LILYFLORE®, isoraldeine, Violet AT and dihydrolinalol to counteract the fecal malodour perceived from a fecal malodour reconstitution was tested. Separate control formulations were also included, comprising LILYFLORE®, Violet AT, isoraldeine and dihydrolinalol separately, at the same concentration as each single ingredient in the test formulation. The sensory evaluation was blind, and performed using olfactometers and a set of more than 30 participants evaluating blind. In parallel, the headspace concentration of the ingredients from the test and three control formulations was determined. The results are shown in Table 20 and
Taken together, these data demonstrate that the test formulation comprising a mixture of LILYFLORE®, Violet AT, isoarldeine and dihydrolinalol was better at reducing the fecal score, and therefore the perception of fecal malodor, and also increasing the pleasantness and freshness score, compared to control formulations containing the single ingredients tested at their same concentration within the mixture.
Publications cited throughout this document are hereby incorporated by reference in their entirety. Although the various aspects of the invention have been illustrated above by reference to examples and preferred aspects, it will be appreciated that the scope of the invention is defined not by the foregoing description but by the following claims properly construed under principles of patent law.
| Number | Date | Country | Kind |
|---|---|---|---|
| 17175114.2 | Jun 2017 | EP | regional |
This application claims priority to U.S. Provisional Patent Application Ser. No. 62/424,072, filed on Nov. 18, 2016, U.S. Provisional Patent Application Ser. No. 62/485,060, filed on Apr. 13, 2017, European Patent Application Serial No. 17175114.2, filed on Jun. 8, 2017, and U.S. Provisional Patent Application Ser. No. 62/556,714, filed on Sep. 11, 2017, the entire contents of which are incorporated by reference in their entirety.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2017/079665 | 11/17/2017 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62556714 | Sep 2017 | US | |
| 62485060 | Apr 2017 | US | |
| 62424072 | Nov 2016 | US |
