Patent Application
20230200404
The present invention belongs to the field of Chemical Industry, more specifically the sector of agricultural chemistry and horticulture.
The present invention describes a method for treating fruits and vegetables, more specifically pome fruits, such as apples, pears and kiwis; tropical fruits, such as avocados, mangos and papaya; and stone fruits, such as peaches, plums, cherries, nectarines, to mention just a few, in the preservation, post-preservation and/or transport to the final destination processes which comprises the application of an aqueous formulation which is a edible coating and said coating comprising at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least a sucro ester of fatty acids or at least a sucroglyceride of fatt acids or a combination thereof.
Fruits and vegetables, especially citric fruits, but also pome fruits such as apples, pears, peaches and even tropical fruits, must be subjected to a preservation process for long periods of time, among others, after the harvesting thereof and during the post-harvest or post-picking period, which comprises the time passed since the picking thereof until it reaches the consumer. The most common process to which fruits and vegetables are subjected is cold storage.
However, during the period, which comprises all the stages from harvesting the fruits to their sale and shipment at their final destination, the fruits tend to suffer different kind of physiological damage, such as scald in case of pome fruit such as apples and pears, which is characterised by irregular patches on their skin.
These patches are an oxidation effect caused by volatiles generated by the fruits themselves, in the metabolic pathway of which ethylene is involved, or due to a breakdown in the tissues caused by its own senescence, which also causes a type of scald due to the effects of various enzymes that cause the oxidation of the tissues. This scald effect, which takes place inside the preservation chamber, has traditionally been resolved by means of various anti-scald treatments, among which the use of chemical products such as diphenylamine (DPA) and ethoxyquin are noteworthy. Their antioxidant effect is so great that it controls both the scald caused by volatiles and enzyme oxidation because it inhibits the effects thereof. However, these treatments are not yet authorised in many countries.
Another means of controlling scald is by means of chemical agents that inhibit the ethylene, which, as mentioned above, is part of the metabolic pathway for producing volatiles. These chemical agents are generally cyclic, short-chain hydrocarbons, the most commonly used being 1-Methylcyclopropene (1-MCP).
Parallel to these chemical treatments, improvements in the cold storage processes have been made. Maintaining the fruit at low temperatures causes the metabolism of the fruit to slow down, which, in addition to delaying aging, reduces respiration and, therefore, the climacteric, thus reducing the production of ethylene. This reduces the production of the volatiles responsible for scald. Furthermore, the low temperature also has an impact by delaying the breakdown of the tissues by enzyme action.
The cold storage process has improved over the last 40 years with the commercial introduction of cold storage in controlled atmosphere (CA) chambers that consist of sealed chambers with specific gas conditions: low oxygen concentration and high carbon dioxide concentration. These conditions slow the metabolism of the fruit to an even greater extent, which reduces the physiological damages and ageing or ripening even more. This enables the preservation period to be increased whilst maintaining suitable organoleptic properties.
Subsequently, with the aim of improving these preservation processes, the working parameters of the controlled atmospheres have been optimised over the years, such that there are other types of cold storage such as Ultra Low Oxygen, or ULO, and Dynamic Controlled Atmosphere, or DCA, which focus on reducing scald. These methods, which we could classify as physical preservation methods, held reduce physiological disorders, but are not as effective in some climates as in others and they are also very expensive preservation processes. This gives rise to the need to find effective and cheaper methods, although they are not sufficient to completely control scalds in the majority of situations, or they are excessively costly.
In addition, during the handling and preparation processes, whether fruit harvested directly from the fields or obtained in a preparation chamber, and due to the sensitivity of the skin thereof, the fruit may suffer damages due to friction, which is referred to as friction scald. This type of scald is manifested through a browning of the skin that is similar to the physiological scald caused during cold storage or post-preservation, although any person skilled in the art may easily identify the differences. These patches on the skin greatly reduce its commercial value.
Moreover, it must be noted that during the post-harvest process, the fruit may also suffer rotting processes caused by microorganisms. These processes are characterised by a softening of the fruit tissue and colour change. This phenomenon, given that it takes place at the same time as the scald, contributes to the deterioration and loss of the organoleptic quality of the fruit.
It is worth highlighting the fact that this control of the scald, enables physiological disorders and reduction of the organoleptic quality to be maintained to a certain extend whilst the fruit is inside the chamber. This is even more so if the cold storage chamber operates with Controlled Atmosphere (CA), ULO or DCA technology.
However, when this preservation process ends, the fruit often has to remain in the chamber with normal atmosphere (NA) for long periods of time during its preparation, handling, sale and shipment to its final destination, and even more time if the final destination is so far away that transportation takes weeks.
The end of the controlled atmosphere and changing to preservation in normal atmosphere entails stress in the fruit which causes an acceleration in the metabolism and the physiological effects that have been slowed during the cold storage period. This, as well as the fact that the side effect of the antioxidants and coatings described above have lost the preserving activity thereof, means that it is very common for scald problems to arise during this period, in addition to the acceleration of the senescence of the fruit, which also makes it more sensitive to friction scald. Furthermore, if the preservation period in normal atmosphere is increased to more than 6 months, these scald effects greatly increase. On top of this, if long-distance shipping of the product is factored in, this transport time may be similar to an increase in preservation time, and if it is after controlled atmosphere, this increase in preservation time in the condition stated entails an increase in the scald and senescence problems, especially when the conditions are not suitable.
A last undesired effect, and which is related to the above effects, is that the fruit over-ripens during the preparation process and transport, once cold storage has ended.
Based on the foregoing, it would be desirable to have effective methods for treating and preventing physiological disorders caused during the post-harvest process.
Therefore, the present invention provides an effective method for treatment, during the post-harvest period via the application of edible coatings that reduce the damages due to physiological scald and friction scald in case of pome fruit as well as delaying the ageing of the fruit after it has been removed from the cold storage chamber and/or during handling, preparation and transport to the final destination processes, and also in case of other crops controlling the physiological or physical disorders specific for each crop which arise during postharvest processes, via the application of an aqueous formulation which is a edible coating and said coating comprising at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least or a sucrose ester of fatty acids or at least a sucroglyceride of fatty acids or a combination thereof.
The present invention describes the method for treating and controlling the physiological disorders that are caused during the post-harvest process of fruits that comprises the application of an aqueous formulation, as described in the present document. Another object of the present invention is the treatment for delaying the ageing of fruit after the removal thereof from the cold storage chamber. An aqueous formulation comprising at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least a sucrose ester of fatty acids or at least a sucroglyceride of fatty acids of fatty acids or a combination thereof, in order to treat harvested fruits, as described in the present application, is also an object of the present invention. Preferably, the aqueous formulation is applied in post-harvest processes of fruits for treating and controlling physiological disorders caused during the post-harvest process.
In the context of the present invention, the term “post-harvest process” is the process that may comprise the phases from harvesting the fruit to its final destination, i.e., the picking, handling, preparation and transport to its final destination.
The method of applying said aqueous formulation could take place during the period of post harvesting, which comprises all the stages, from harvesting the fruit to their sale, such as harvesting, handling, storage, either in controlled atmosphere or in normal atmosphere, processing, packaging, transportation and marketing.
In the context of the present document, the aqueous formulation is also referred to as coating.
Likewise, the present invention is applied for treating pome fruits, such as apples and pears, by means of showering, soaking, drencher or spray application, before it is put into the cold storage chamber to delay the scald of the fruit and to delay ripening, senescence and weight loss during said cold storage process.
This invention is also beneficial to improve and extend the post-harvest life of other crops, such as stone fruits, for example, plums, peaches, nectarines or kiwis, avocados, which are also known as alligator pears, among other crops.
In all cases, the formulation of the invention is an aqueous formulation comprising at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least a sucrose ester of fatty acids or at least a sucroglyceride of fatty acids or a combination thereof.
In a preferred embodiment, as an alternative to the use of chemical antioxidants and ethylene blockers, the present document describes the method of applying said coating, by means of the production of internal atmospheres in the fruit, delay surprisingly the decomposition, and therefore, the ageing of the tissues, also delaying the scald problems. The coating comprises at least one phospholipid, preferably lecithin, at least one sucrose ester of fatty acids or sucroglyceride, and additionally, other agents authorised in the coating of fruit. This aqueous composition may or may not be strengthened with food grade antioxidants to improve the properties of the physiological disorders control, and may be combined with fungicides for rot control.
This invention is beneficial to improve and extend the post-harvest life of other crops, such as stone fruits, for example, plums, peaches, nectarines or kiwis, avocados, which are also known as alligator pears, among other crops, by controlling the physiological or physical disorders specific for each crop which arise during postharvest processes.
The present invention describes the method for treating and controlling physiological disorders that are caused during the post-harvest process of fruit, whether pome, stone or tropical fruits, among others, which comprises the application of a dilution of an aqueous solution comprising at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least a sucrose ester of fatty acids or at least a sucroglyceride of fatty acids or a combination thereof, the application being during any one of the stages of the fruit handling, preparation and transport process.
In the context of the present application, the method described in the present document comprises applying an aqueous formulation which is also referred to as coating. Due to their components, said aqueous formulation of the invention is an edible coating, which is a great valuable property of the aqueous formulation and makes the difference with other type of coatings usually used in the agriculture industry like waxes.
The present document proposes a method that comprises applying an aqueous solution that acts by producing internal atmospheres in the fruit, delaying the decomposition and, therefore, the ageing of the tissues, and scald. In a preferred embodiment, the coating described in the present document comprises at least one phospholipid, preferably lecithin. Moreover, in a preferred embodiment, the aqueous formulation applied comprises compounds of the family of sucrose esters of fatty acids or sucroglycerides, or other agents authorised for use in the coating of fruits in different legislations, such as Cfr21 of the United States FDA, the United States GRAS legislation or the European Union Regulation 1338/2008. These treatments may or may not be strengthened with food grade antioxidants to improve the properties of the scald control. In this regard, a preferred embodiment of the method, object of the invention further comprises applying at least one chemical-type anti-scald compound, such as diphenylamine, ethoxyquin, butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), tert-butylhydroquinone (TBHQ), among others. In other embodiments, these anti-scald compounds may be mixed with the coating, forming part of the aqueous formulation, such that as well as the beneficial effect of the same in controlling physiological disorders.
Due to the long preservation period of fruit, it may be affected by fungal or bacterial infections. In these cases, a preferred embodiment of the method object of the invention further comprises applying at least one fungicide agent that is selected from the group consisting of imazalil, tiabendazole, pyrimethanil, fludioxonil, benzimidazoles, imidazoles, strobilurins, phthalimides, iprodione, vinclozolins, carboximides and a combination of the above. In other preferred embodiment, the fungicide agent is a fungistatic food additive, such as those derived from sorbic acid, such as potassium sorbate, sodium sorbate, calcium sorbate, sorbic acid. Benzoates, carbonates and bicarbonates, among others, are also non-limiting examples of antifungal agents. Additionally, in further embodiments, the antigungal agent is a natural extract or active ingredient of natural extracts, such as, cinnamon, clove, citrus, mint and eucalyptus extracts, citronella, eugenol, cinnamaldehyde, and thymol, among others, or combinations of the above.
In a preferred embodiment, the method object of the invention comprises applying at least one antifungal agent as it is described above, but additionally, in other embodiments, these antifungal agents may be mixed with the coating, forming part of the aqueous formulation, such that as well as the beneficial effect of the same in controlling physiological disorders and in extending commercial life, rot is controlled.
In all the embodiments of the present invention, the method described comprises applying the aqueous solution, in combination or mixed with other additional components, via shower, drencher, soaker or fumigation by applicators. Similarly, these coatings may be combined with subsequent applications inside the cold chamber through fumigant containers, cold fumigation, thermo applications, thermofogging, once the previous application of the coating of the invention has been carried out on the fruit when it is put in the cold storage chamber.
Moreover, said formulation may be applied both before the preservation or inside the chamber, combined (in a mixture or separately) with fumigant or aerosol means or another similar type, with fungistatic or natural fungicide products, such as natural extracts or food additives, or basic substances, basic substances being a type of phytosanitary certification consisting of a product that has functions that are different to phytosanitary functions, but that has shown its safety and phytosanitary effectiveness. An example of a basic substance is sodium bicarbonate.
Additionally, a preferred embodiment of the method object of the invention further comprises applying at least one biocide or disinfectant. Furthermore, the method described may comprise applying the aqueous formulation mixed with biocides or disinfectant, wherein the aqueous formulation comprises at least one biocide or disinfectant in its composition thereof.
The invention does not function as an antioxidant per se, although it does have great effectiveness in delaying the appearance of scald and other oxidative damages, thus meaning it enables the fruit to maintain organoleptic characteristics and commercial appearance long enough to complete normal cold storage.
By applying the formula of the invention, the aim of the method described in the present document is to extend the commercial life of the fruits that, depending on each crop, it translates into the reduction of physiological disorders mentioned in the previous section of the present document, such as maintaining the firmness of the fruits, which is also known as penetrometry, reduction in weight loss, delay or reduction of tissue oxidation, or general improvement of the appearance of the fruit.
The method object of the invention, comprises applying the formulation during the period of post harvesting, which comprises all the stages from harvesting the fruit to their sale, such as harvesting, handling, storage, either in controlled atmosphere or in normal atmosphere, processing, packaging, transportation and marketing. In a preferred embodiment, the method object of the invention, in the case of pome fruit, comprises applying the formulation in the preservation phase before changing to Normal Cold from Controlled Atmosphere (CA). Additionally, “Normal cold” is understood as the low-temperature conditions to which the picked fruit is subjected and an atmospheric condition that is found in nature, this is without altering the concentrations of the main elements thereof, which are oxygen and CO2 that are approximately at a concentration of 21% and 78%, respectively.
After the harvesting process, the fruit may be stored in cold chambers that have specific gas conditions, which are known as controlled atmosphere (CA) chambers. Said gas conditions are characterised in that they have a low oxygen concentration and a high carbon dioxide concentration. Said gas conditions depend on the type of fruit and its variety and are established by approved tables. For example, for the blanquilla pear, these tables recommend an oxygen concentration of 3 to 3.5% and CO2 concentration of 1.5%. Another example is the golden apple, a fruit for which the controlled atmosphere conditions recommended by said tables would be a concentration of 2% oxygen and 1.5% CO2.
As examples of gas temperature and concentration ranges, we have the following (Graell, Horticultura 172, October 2003)
1-1.5
0-0.5
2-2.5
0-1.5
In another preferred embodiment, the application of the aqueous formulation, object of the present invention, may be applied at the end of the cold storage process and before the fruit handling, preparation and transport.
In another preferred embodiment, the application of the aqueous formulation, object of the present invention, may be applied in the factory immediately after the harvest, or in the preparation line before the handling and/or sale and/or transport thereof.
Furthermore, in the context of the present application, “post-harvest physiological disorders” is understood as all the damages caused in the fruit by physiological scald, friction scald, oxidation (browing), weight loss, softening, and ageing during the post-harvest process.
In application preferred embodiment, the method of post-harvest treatment is understood as the treatment that comprises applying a dilution of the aqueous solution and the beneficial effect of which is the treatment and control of physiological disorders that are caused in the post-harvest process as well as the treatment and delay of ageing or ripening of the fruit.
In one embodiment of the invention, the method, object of the invention, comprises applying on the fruit to be treated an effective concentration of the aqueous formulation described in the present application.
In one embodiment of the present invention, when the aim is to preserve fruits, delaying the appearance of scald and enabling the fruit to maintain better conditions, an application is carried out before the fruit is put into the cold chamber, both in normal cold and controlled atmosphere.
In a preferred embodiment, the method object of the invention comprises applying the aqueous formulation diluted in water in a concentration comprised in the range between 0.1% to 10% (v/v). More preferably, the concentration of the diluted aqueous formulation is in a concentration comprised in the range between 0.1% and 5% (v/v). In an even more preferred embodiment, the aqueous formulation is diluted in a concentration comprised in the range between 0.1% and 2% (v/v).
In another preferred embodiment of the present invention, when the application of the aqueous formulation, object of the invention, is carried out on pome fruit after changing from preservation in controlled atmosphere to normal atmosphere, or after picking, when the fruit is produced directly in the preparation line, or when the fruit is sent to the final destination, o when it is a combination of some of the post-harvest steps mentioned above, the method comprises applying the aqueous formulation diluted in water in a concentration comprised in the range between 0.1% to 1% (v/v). More preferably, the concentration of the diluted aqueous formulation is in a concentration comprised in the range between 0.15% and 0.5% (v/v). In an even more preferred embodiment, the aqueous formulation is diluted in a concentration comprised in the range between 0.2% and 0.4% (v/v).
When the formulation, object of the invention, is applied to other types of fruit, such as stone fruit or tropical fruits, such as plums, avocados or kiwis for example, the method comprises applying the aqueous formulation diluted in water in a concentration comprised between 1% and 10% (v/v). More preferably, the concentration of the diluted aqueous formulation is in a concentration comprised in the range between 1% and 5% (v/v). In an even more preferred embodiment, this concentration is comprised between 2% and 5% (v/v). In these cases, the application of the formulation may be carried out before the fruit is put in the cold chamber, or before the sale thereof, or before it is shipped to the final destination, both in normal cold and controlled atmosphere conditions, to improve the condition of the fruit, maintaining the firmness, reducing the weight loss and preventing browning of the skin or flesh or dehydration of the fruits.
The dilution of the aqueous formulation that is applied in the method, object of the invention, may be formulated as a liquid, including aerosols. In a preferred embodiment of the method, object of the invention, the diluted aqueous formulation in liquid form is applied in one of the following systems: drencher, also known in the art as soakers, basin, un loader or preparation water lines.
In another preferred embodiment of the method, object of the invention, the dilution of the aqueous formulation is in aerosol form and is applied on the fruit via one of the following systems: spray, pulverisation or fumigation.
The method, object of the invention, may be combined with the treatments commonly used in post-harvesting such as anti-scald and/or antifungal treatments derived from food additives and natural extracts. Additionally, the treatment method may comprise applying the diluted aqueous formulation strengthened with antioxidants, adding them to the aqueous formulation before it is diluted, or mixing the antioxidants directly with the diluted aqueous formulation.
The anti-scald treatments that may be combined with the method, object of the invention, are based on the application of chemical-type anti-scalds, such as diphenylamine, ethoxyquin, butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), tert-butylhydroquinone (TBHQ), among others.
Likewise, the antifungal treatments that may be combined with the method, object of the invention, are based on the application of the following fungicide agents that are selected from the group consisting of imazalil, tiabendazole, pyrimethanil, fludioxonil, benzimidazoles, imidazoles, strobilurins, phthalimides, iprodione, vinclozolins, carboximides and a combination of the above. Similarly, said fungicide treatments may be based on the application of antifungals made from fungistatic food additives, such as those derived from sorbic acid, such as potassium sorbate, sodium sorbate, calcium sorbate or sorbic acid. Benzoates, carbonates or bicarbonates, among others, are also non-limiting examples of antifungal agents. Additionally, these antifungal treatments may be based on the application of natural extracts or active ingredients of natural extracts, such as, cinnamon, clove, citrus, mint and eucalyptus extracts, citronella, eugenol, cinnamaldehyde, and thymol, among others, or combinations of the above.
An aqueous formulation comprising at least at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least a sucrose ester of fatty acids or at least a sucroglyceride of fatty acids or a combination thereof is also an object of the present invention. The aqueous formulation may additionally comprise other compounds that improve the physical-chemical characteristics of said aqueous formulation.
Additionally, an object of the present invention is a dilution of the aqueous formulation wherein said formulation is diluted in water at a concentration comprised between 0.1% to 10% (v/v).
Preferably, the aqueous formulation is applied in post-harvest processes on pome fruit and other crops for treating and controlling physiological disorders that are caused during said post-harvest processes as described in the present document. After the fruit are treated with the aqueous formulation described, surprising results are obtained as may be seen in examples 1, 2 and 3 of the present document.
The present formulation comprises at least one phospholipid, or at least one polysorbate, or at least a sorbitan ester, or at least a sucrose ester of fatty acids or at least a sucroglyceride of fatty acids or a combination thereof, and water, being the sum of all the amounts of the components equal to 100%.
Furthermore, in a preferred embodiment, the formulation object of the invention, may comprise other additives that improve the physical-chemical characteristics of said formulation, it being understood that the sum of the amounts of all the components that form part of the aqueous formulation is always 100%. That is to say, the fact that the total composition of the formulation is completed with water up to 100% does not mean that the incorporation of additives to those considered essential is excluded.
As a result of the method described in the present application, surprising results have been noted in plums since the commercial life is increased, controlling dehydration and improving the appearance after long periods of preservation as shown in example 4 of the present document.
In the case of avocados, the application of the formulation, object of the invention, has reduced weight loss, improved internal and external appearance, and has also considerably increased commercial life, as described in example 5.
In the case of applications of the aqueous formulation on kiwis, great effectiveness is shown in maintaining the firmness and controlling weight loss, as described in example 6.
In a preferred embodiment, the aqueous formulation object of the invention may comprise a phospholipid or a mixture of phospholipids, at least one emulsifier suited to the Hydrophilic-Lipophilic Balance (HLB) of the phospholipid, at least one preservative and at least one defoamer.
In a preferred embodiment, the aqueous formulation may further comprise a coating or film-forming agent.
In the context of the present application, the Hydrophilic-Lipophilic Balance is a quantitative characteristic of a surfactant that quantifies the balance between the hydrophilic portion and the lipophilic portion of said surfactant. In turn, this balance indicates the solubility of the surfactant in water. Taking into account the fact that the aqueous formulation may comprise a phospholipid as an active ingredient and, in turn, it may be combined with film-forming components and other additives, it is essential that the emulsifier used when preparing the formulation, object of the invention, be suitable for obtaining the HLB required to emulsify the phospholipid that is slightly soluble in water.
The formulation, object of the invention, when comprises one or several phospholipids as an active ingredient. A non-limiting example of a phospholipid that the formulation, object of the invention, may comprise is phosphatidylcholine, more commonly known as lecithin, and may be of animal or plant origin. In a preferred embodiment, the lecithin of plant origin may be sunflower or soy lecithin, sunflower lecithin, which is less allergenic, being even more preferred, although there are other plant sources such as cotton, maize, rapeseed, among others. In another preferred embodiment, the lecithin may be of animal origin, lecithin originating from egg yolk being even more preferred, although it may have other animal origins such as milk.
In the scope of the present application, phospholipids have the following beneficial effects:
In one embodiment of the invention, the formulation, object of the invention, may comprise a composition in ratio w/w:
In the scope of the present invention, the amount of water that the formulation, object of the invention, comprises is the necessary amount in order for the sum of the quantities of the components to be equal to 100% (w/w).
Furthermore, the amount of defoamer is determined by the amount of foam that is produced during the preparation of the formulation, object of the invention, said amount of defoamer being comprised in a range of 0-0.4%, and in a preferred embodiment, in an amount comprised between 0.1 to 0.2%.
The polysorbates are non-ionic surfactants derived from sorbitan, which act via esterification and ethoxylation reactions with fatty acids and the non-ionic surfactant made up of sorbitan esters. The presence of polysorbate, the sorbitan ester or their combination in the formulation, object of the invention, must result in the HLB suitable for the emulsion of the substance required in the formulation. Both surfactant families are considered food additives. Therefore, in the present invention, the combination of polysorbates and sorbitan esters present in the formulation, object of the invention, must be in a suitable proportion with the HLB with the phospholipids that are used in each embodiment of said formulation.
In the context of the present invention, the sucrose esters of fatty acids and the sucroseglycerids of fatty acids are film formers, that due to its lipidic nature, said components can be used as edible coatings, regulating the gas exchanging so can help to delay aging by means of the reduction of respiration through the skin of the fruit, and helping to avoid the losses of water which lead to weight loss control.
In a preferred embodiment, when the formulation, object of the invention, comprises at least one of said film formers, the sucrose ester of fatty acids or the sucroglyceride of fatty acids or the combination thereof are comprised in an amount between 0.1 to 20% (w/w). In a more preferred embodiment, the sucrose ester of fatty acids or the sucroglyceride of fatty acid or the combination thereof are comprised in an amount between 3 to 10% (w/w)
In other preferred embodiment, the formulation may comprise an additive which is at least a cellulose derivate, which is another film former. In the context of the present invention, this cellulose derivate may be comprised in the formulation in combination with the sucrose ester of fatty acids or the sucroglyceride of fatty acids or the combination thereof. In other preferred embodiment, said cellulose derivate may be comprised in the formulation alone. In both cases, the at least one cellulose derivate is comprised in the formulation in an amount between 0 to 20% (w/w), and in a more preferred embodiment, said cellulose derivate is comprised in an amount between 2 to 5% (w/w). Said cellulose derivate, that may be comprised in the present formulation, is selected from the group consisting of methylcellulose, ethylcellulose, hydroxyethylmethylcellulose, hydroxypropyl cellulose, carboxymethylcellulose, or a polymer of said cellulose derivate and a combination thereof, wherein the polymers mentioned in this group of compounds are the polymers of said cellulose derivate.
In a preferred embodiment of the invention, the formulation, object of the invention, may comprise lecithin as a phospholipid, the formulation having the composition in proportion w/w as stated below:
In other preferred embodiment, the aqueous formulation, object of the invention, which is referred to as formulation 1, may comprise the following formulation w/w:
In a particular embodiment, the soy lecithin may be substituted for sunflower lecithin, or any other phospholipid with antioxidant or cell wall-forming function. On this basis, a particular embodiment of said aqueous formulation with Sunflower Lecithin, which is referred to as formulation 2, may comprise the following composition w/w:
Said aqueous formulations may comprise two types of lecithin described above which are Sunflower lecithin and soy lecithin. Both lecithins are used interchangeably to different embodiments of the aqueous formulation, the difference between the two being exclusively the texture thereof.
As has been noted with the combination of polysorbates and sorbitan esters present in the formulation, object of the invention, they must be in a suitable proportion with the HLB of the lecithin.
In a preferred embodiment, the aqueous formulation of the present application may comprise at least one glycol. The glycols act as a plasticizer in the present invention. The glycol may be selected from the group consisting of glycerin, propylene glycol, dipropylene glycol or a combination of the above.
In another preferred embodiment, the aqueous formulation is applied on pome fruits, kiwi, avocado, and stone fruits, among other crops, the formulation has another type of film former, such as sucrose esters of fatty acids, sucrose glycerides or celluloses, which is referred to as formulation 3, resulting in the following formulation:
Additionally, a more preferred embodiment, the aqueous formulation is applied on melon, among other crops, which is referred to as formulation 4, resulting in the following formulation:
Likewise, the aqueous formulation, object of the invention, may also comprise antioxidants, anti-scald agents, antifungal agents or a combination of the above.
The antioxidant agents that may comprise the aqueous formulation may in turn be of natural origin or chemical origin. The purpose of adding an antioxidant agent to the aqueous formulation is to combine the protective action of the aqueous formulation with the action of the antioxidant agent, promoting the synergistic protective action of said formulation, also delaying the senescence of the fruit. In this aspect, suitable but non-limiting examples of antioxidant agents of natural origin that may be comprised in the aqueous formulation are citric acid, ascorbic acid, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), lactic acids, citric acids, tartrates, propyl gallates, 6-O-Palmitoylascorbic acid, food additives or a combination of the above. Additionally, non-limiting examples of antioxidant agents of chemical origin that may comprise the aqueous formulation are diphenylamine, methyldiphenylamine, ethoxyquin or a combination of the above.
As stated before, the formulation, object of the invention, may also comprise chemical anti-scald agents in the composition thereof. In this aspect, the aqueous formulation may comprise chemical anti-scald agents that have been described above in the present application.
Moreover, the aqueous formulation, object of the invention, may comprise the fungicides that have been described above in the present application.
The aim of all the aforementioned combinations is to obtain a synergistic effect in the reduction of physiological disorders and, preferably, scalds and, in addition, depending on the type of crop, in the case of the combination of the aqueous formulation with fungicide substances, in order to obtain an additional antifungal effect in the aqueous formulation described in the present application.
Taking into consideration what is described in the present document, the method and the aqueous formulation, object of the invention, enable the reduction of the occurrence of:
1.—Physiological scald during preservation
2.—Physiological scald caused by ending Controlled Atmosphere (CA) preservation and changing to Normal Cold.
3.—Physiological scald caused by lengthening the preservation to periods of time longer than the recommended for the variety concerned in normal cold.
4.—Physiological scald during transport.
4.—Physiological scald due to senescence.
6.—Friction scald during the handling, preparation and transport processes, this being after a preservation process.
7.—Over-ripening or loss of organoleptic properties.
For the purpose of contributing to a better understanding of the invention, and in accordance with a practical embodiment thereof, this description is accompanied by a series of examples constituting an integral part of the same, by way of illustration and never limiting the invention.
A study was carried out to evaluate different fruit preservation alternatives, the majority of which were based on the formulation 3 preparation, alone or in combination with different additives, DPA and ethoxyquin to control scald.
The treatments tested were the following:
Formulation 3 diluted to 2% (v/v) was applied by immersing a total of 1800 kg of Granny Smith apples. Said fruits had been picked early and then preserved for 6 months in a Controlled Atmosphere (CA) and Normal Cold (NC). CA and NC, 0.5° C., 90-9% Relative Humidity (RH)
The following properties were evaluated in each of the storage conditions:
A sampling and continuous analysis of each of the laboratory chambers in which the trial was carried out was performed.
From the results obtained in the present study, it is concluded that treatment with formulation 3 is the best treatment to maintain good quality of the apples and slow down the development of surface scald.
In the present study of effectiveness, formulation 1, as it is described in table 4 of the present application, was applied in 4 facilities, wherein 4 post-harvest treatments were applied to fruit, using said formulation in different concentrations and fruit in different conditions.
Methodology:
0.2% (v/v) of formulation 1 was applied to pears in the basin of an unloader on a production line of the factory when they were removed from the chamber. The fruit had been previously treated with 1-methylcyclopropane (1-MCP) and the control sample showed significant problems due to friction on the line and physiological disorders and scald caused by blows and friction on the line and in the brushes.
After the week of treatment, the following results were observed:
As a result of the application of the treatment, an improvement in both the protection of the fruit and its shine was observed, and in particular, it was observed that damages caused by friction were significantly reduced by more than 50% and, to the same extent, the fruit had a shine that gave it a better commercial appearance.
Methodology:
The formulation 1 was applied in a proportion of 3 litres/1000 of water (0.3% (v/v)) in the drencher to the Blanquilla pear coming from a controlled atmosphere (CA) chamber. The fruit had been treated prior to preservation with coatings to delay the occurrence of scald during cold storage.
After the week of treatment, the following results were observed:
The treatment with the formulation 1 manages to delay the appearance of scald for several days after the fruit leaves the CA cold storage. This is significant because after preservation, there is a sales period for fruit during which the fruit is stored in a conventional cold chamber and when the post-preservation development of scald begins, producing a large amount of damage caused by scald at that time. Treatment with the formulation 1 has demonstrated that it delays the development of scald for several days, which could be the period needed for sale, such that damage caused by scald in this process is reduced and the sales period is extended. It is important to take into account that this extended period for post-preservation sale is dependent on the greater or lesser sensitivity of the fruit to scald, the appearance of scald being delayed by less or more days, respectively.
Methodology:
The formulation 1 was applied in a proportion of 3.5 litres/1000 of water (0.35% v/v) to the directly picked Limonera and Carmen pear in the basin of an unloader on a production line of the factory when they were removed from the chamber.
After the week of treatment, the following results were observed:
When assessing the results obtained from this trial, it was taken into account that the brushes involved in the process were very stiff and had dry remains, such that reducing damages due to friction could not be optimized.
The treatment improved the appearance and shine of the fruit; however, damages due to friction were not reduced as effectively as in other trials due to the poor state of the brushes. Therefore, it is necessary to pay attention to the state of the brushes before applying the treatments. Despite these poor conditions, an improvement in the appearance and state of the fruit was observed.
Methodology:
The formulation 1 was applied in a dosage of 3.5 litres/1000 of water (0.35% (v/v)) to a very old Conference pear coming from CA, which had already been on sale for a month, in a water unloader, such that the intended effect of the treatment was basically that of improving its commercial appearance. Due to the ageing of the fruit, a reliable study on the reduction of physiological disorders due to friction could not be expected, even more so in the case of this factory, with an old production line in not very good conditions, which continuously struck and rubbed against the fruit.
After the week of treatment, the following results were observed:
The application of the treatment improved the commercial state of the fruit, giving it shine and improving its appearance, such that the improvements of the application were evident. Regarding control of the physiological disorders, also known as scald, due to friction, it was also observed that its reduction was not as significant as expected.
The application of formulation 1 during the sales period after cold storage, even in the case of fruit with a long post-preservation time, and in a state that is not good enough, is beneficial for improving its commercial aspect, especially for making it healthier and shinier so that it is more marketable.
Methodology:
In the present study of effectiveness, formulation 2 which contains Sunflower lecithin described in table 5 of the present application, was applied in a facility where a post-harvest treatment was carried out on pears using said formulation in a concentration of 0.4% (v/v) following its removal from the chamber in controlled atmosphere (CA) and before entering normal atmosphere (NA), then spending approximately 20 days in the NA on the production line. This study was carried out to verify 1) the delay in the appearance of physiological scald when passing from CA to NA and 2) to verify the effectiveness in controlling scald due to friction on the line and maintaining the good appearance and marketability thereof, after passing through CA, then through NA and making the fruit marketable.
The results obtained were excellent, as shown in the photographs below:
Pears of the Blanquilla variety were treated in the drencher with the formulation 2 (with sunflower lecithin) after 9 months of cold storage in a controlled atmosphere (CA) and then were introduced into a normal atmosphere (NA) chamber in order to proceed with their progressive sale. After approximately 20 days in NA, the fruit had a healthy appearance without symptoms of physiological scald. The treatment was carried out after it had been removed from the CA chamber and before it was introduced into the NA chamber. As the fruit was marketed, the presence/absence of physiological scald was first assessed when removed from the NA. Later, the fruit was prepared and the damages due to friction scald, as well as the appearance and health of the fruit after being marketed, were evaluated.
It was possible to verify that:
1.—The fruit treated with formulation 2, showed effectiveness in delaying the appearance of physiological scald, since symptoms thereof were not evident (see
2.—After preparing the fruit, significant losses caused by friction scald were not evident. Likewise, the fruit had a healthy appearance and a natural shine that made it very marketable (see
In conclusion, the post-harvest application of formulation 2 made with sunflower lecithin, has shown effectiveness in:
1.—Delaying the appearance of symptoms of physiological scald after changing from storage in the controlled atmosphere, CA, to storage in the normal atmosphere, NA.
2. It has shown effectiveness in significantly reducing (in this case, almost completely reducing) damages caused by friction scald after preparation.
3.—The formulation provides a healthy appearance and a natural shine that increases its marketability.
A comparative study with various treatments of formulation 3 was carried out to determine the effectiveness of the formulation, object of the invention, in a facility where a post-harvest treatment was carried out on plums. In order to evaluate said effectiveness, a group of fruit (called a control group), to which no type of coating is applied, were storage in the same conditions.
The treatments applied were the following:
Decco Lustr 255 is a vegetable oil-based wax.
Methodology
The treatments described in the previous section were applied to several groups of fruit, and assessments were made on weight loss (see
The room temperature (RT°) of all cases is 20° C.
Results
As may be seen in the graph on weight loss, the fruit treated with formulation 3 in a concentration of 2% (v/v) and 5% (v/v) showed less weight loss and better external appearance and flesh preservation.
The formulation 3 which was applied at both 2% and 5% had good control over dehydration.
The formulation 3 preparation applied at 2% shows control over dehydration which is slightly better than the 5% dosage in the evaluation at 30 days in cold storage, decreasing the difference in the evaluation at 55 days. Likewise, the longer the assessment at room temperature, the smaller the difference.
Treatments with formulation 3 preserve the bloom which is the natural wax of fruit, thus giving it a better commercial and natural appearance despite being coated with the dilution of the preparation.
Therefore, the formulation 3 has demonstrated good qualities in preserving plums.
Methodology
A comparative study with various treatments of formulation 3 was carried out to determine the effectiveness of the formulation, object of the invention, in a facility where a post-harvest treatment was carried out on avocados. In order to evaluate said effectiveness, a group of fruit (called a control group), to which no type of coating is applied, were storage in the same conditions.
The treatments applied were the following:
The fruit to which Decco Lustr 255+“Formulation 3” in a concentration of 2% (v/v) was applied consisted in the application of Decco Lustr 225 to 450 kg of fruit, and then applying a treatment of 2% of Formulation 3.
Methodology
The treatments described in the previous section were applied to various groups of fruit and assessments were made on weight loss (see
And another assessment of weight loss after:
Furthermore, the dispersion of fruit ripeness (see
On the other hand, the colour change (see
The outer appearance and the state of the flesh of the avocados were also assessed by means of a cross section at various times during the preservation period (see
Results:
The application of the formulation, object of the invention, has reduced weight loss, improved internal and external appearance, and has also considerably increased commercial life.
The formulation 3 demonstrated good properties in reducing weight loss, maintaining firmness, reducing internal and external browning, homogenization in colour ripeness, and ultimately, in improving the appearance and marketability of avocados.
Therefore, the formulation 3 is a good alternative to extend the commercial life of avocados.
A comparative study with various treatments of formulation was carried out to determine the effectiveness of the formulation, object of the invention, in a facility where a post-harvest treatment was carried out on kiwis. The treatments applied were the following:
T0: Which is a control group of fruit to which no type of coating is applied, were storage in the same conditions.
T1: formulation 3 diluted to 2% (v/v) was applied
T2: formulation 3 diluted to 5% (v/v) was applied
The 3 treatments described were applied by immersing a total of 1800 kg of kiwi.
Methodology
The flesh firmness was assessed through the “LB-F” index (see
Furthermore, assessments were made on the percentage of weight loss (see
Furthermore, assessments were made on the firmness of the columella (see
Formulation 3 has demonstrated very good properties in controlling weight loss, maintaining firmness, and most importantly, maintaining firmness of the columella (white part of the kiwi flesh), which has proven to be a good treatment to extend the commercial life of kiwis.
On average, the dosage of 2% seems to be the one recommended for this fruit.
A comparative study with various treatments of formulation was carried out to determine the effectiveness of the formulation, object of the invention, in a facility where a post-harvest treatment was carried out on melons. The treatments applied were the following:
T1: Formulation 4 diluted to 10% (v/v) in combination with Cinnamaldehyde 30% diluted to 0.8% (v/v) were applied
T2: Formulation 4 diluted to 10% (v/v) in combination with Cinnamaldehyde 30% diluted to 0.8% (v/v) and Potassium Phosphite 45% diluted to 0.4% (v/v) were applied
T3: Formulation 4 diluted to 10% (v/v) in combination with Imazalil (as sulphate) 7.5% diluted to 0.4% (v/v) were applied
T4: This is a control group of fruit to which water was applied
Methodology
The 4 treatments described were applied by drenching, with 1000 litres of solution with 10% of dilution of formulation 4 to a total of 60.000 kg of melons. After said treatments, the fruit is stored in two different conditions of length and temperature:
At the end of both storage periods, the following parameters of the appearance of the skin of the fruit were measured:
Furthermore, at the end of the second storage, the following quality parameters were measured:
Results:
The melons that were treated with treatments 1, 2 and 3 did not shown brown specks at the end of the storage (see
Additionally, the results of this assessment the appearance of the skin of the fruit are resumed in the following table:
Finally, the results obtained for the quality parameters measured in the present study were:
Application of formulation 4 in melons, has demonstrated the following advantages at the end of cold storage:
1.—Delay aging and senescence, and better firmness, as it is shown in quality parameters evaluated at the end of storage
2.—Better aspect and reduction of oxidation of fruits, as can be sawn in the pictures attached. Fruits treated has maintained freshness whereas fruit of control with no treatment practically have lost all their commercial properties.
3.—Mixing with fungicides have controlled decay development of the fruits.
| Number | Date | Country | Kind |
|---|---|---|---|
| P201731140 | Sep 2017 | ES | national |
This application is a continuation application of U.S. patent application Ser. No. 16/648,824, filed Mar. 19, 2020, which claimed the benefit of PCT/IB2018/056911 filed on Sep. 11, 2018, which claimed the benefit of Spanish Patent No. P201731140 filed on Sep. 22, 2017, both of which are incorporated by reference in their entirety herein.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16648824 | Mar 2020 | US |
| Child | 18179580 | US |
