Claims
- 1. A process for simultaneously desizing and bleaching a sized fabric containing starch or starch derivatives, said process comprising treating the fabric with a bleaching composition and an oxidation stable .alpha.-amylase, wherein the .alpha.-amylase comprises the amino acid sequence of SEQ ID NO:2 or an analogue of said .alpha.-amylase, which
- i) is at least 60% homologous with the sequence shown in SEQ ID NO:2,
- ii) reacts with an antibody raised against said .alpha.-amylase, and
- iii) is encoded by a DNA sequence which hybridizes with the same probe as a DNA sequence encoding the .alpha.-amylase having the amino acid sequence of SEQ ID NO:2.
- 2. The process of claim 1, wherein the .alpha.-amylase is derived from Bacillus licheniformis, Bacillus amyloliquefaciens or Bacillus stearothermophilus.
- 3. The process of claim 1, wherein the methionine residue in position 197 of the .alpha.-amylase of SEQ ID NO:2 has been replaced with an amino acid selected from the group consisting of Leu, Thr, Ala, Gly, Ser, Ile and Asp.
- 4. A process for simultaneously desizing and bleaching a sized fabric containing starch or starch derivatives, said process comprising treating the fabric with a bleaching composition and an oxidation stable .alpha.-amylase, wherein the .alpha.-amylase comprises the amino acid sequence of SEQ ID NO:4 or an analogue of said .alpha.-amylase, which
- i) is at least 60% homologous with the sequence shown in SEQ ID NO:4,
- ii) reacts with an antibody raised against said .alpha.-amylase, and
- iii) is encoded by a DNA sequence which hybridizes with the same probe as a DNA sequence encoding the .alpha.-amylase having the amino acid sequence of SEQ ID NO:4.
- 5. The process of claim 4, wherein the .alpha.-amylase is derived from Bacillus licheniformis, Bacillus amyloliquefaciens or Bacillus stearothemophilus.
- 6. The process of claim 5, wherein the .alpha.-amylase is derived from Bacillus licheniformis, Bacillus amyloliquefaciens or Bacillus stearothermophilus.
- 7. A process for simultaneously desizing and bleaching a sized fabric containing starch or starch derivatives, said process comprising treating the fabric with a bleaching composition and an oxidation stable .alpha.-amylase, wherein the .alpha.-amylase comprises the amino acid sequence of SEQ ID NO:6 or an analogue of said .alpha.-amylase, which
- i) is at least 60% homologous with the sequence shown in SEQ ID NO:6,
- ii) reacts with an antibody raised against said .alpha.-amylase, and
- iii) is encoded by a DNA sequence which hybridizes with the same probe as a DNA sequence encoding the .alpha.-amylase having the amino acid sequence of SEQ ID NO:6.
- 8. The process of claim 7, wherein the methionine residue in position 200 and/or 206 of the .alpha.-amylase of SEQ ID NO:6 has been replaced with an amino acid selected from the group consisting of Leu, Thr, Ala, Gly, Ser, Ile and Asp.
- 9. A process for simultaneously desizing and bleaching of a sized fabric containing starch or starch derivatives, which process comprises treating the fabric with a bleaching composition and an oxidation stable .alpha.-amylase, wherein the oxidation stable .alpha.-amylase has been prepared from a parent .alpha.-amylase by replacing one or more methionine residues of the parent .alpha.-amylase with an amino acid selected from the group consisting of Leu, Thr, Ala, Gly, Ser, Ile and Asp.
- 10. The process of claim 9, further comprising adding a stabilizer and/or a wetting agent.
- 11. The process of claim 9, wherein the bleaching composition is hydrogen peroxide.
- 12. The process of claim 11, wherein the oxidation stable .alpha.-amylase is used in an amount of 1-10 g/l and/or the hydrogen peroxide is used in an amount of 1-50 g/l.
- 13. The process of claim 9, wherein the combined desizing and bleaching process is performed at a temperature in the range of 30-100.degree. C. and a pH in the range of 6.5-11.
- 14. The process of claim 9, wherein the oxidation stable .alpha.-amylase is used in an amount of 1-5 g/l.
- 15. The process of claim 14, wherein the oxidation stable .alpha.-amylase is used in an amount of 1-3 g/l.
- 16. A composition for use in a simultaneous desizing and bleaching process comprising an oxidation stable .alpha.-amylase in combination with at least one further component selected from the group consisting of wetting agents, dispersing agents, sequestering agents and emulsifying agents, wherein the oxidation stable .alpha.-amylase has been prepared from a parent .alpha.-amylase by replacing one or more methionine residues of the parent .alpha.-amylase with an amino acid selected from the group consisting of Leu, Thr, Ala, Gly, Ser, Ile and Asp.
Priority Claims (1)
Number |
Date |
Country |
Kind |
0141/94 |
Feb 1994 |
DKX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a 35 U.S.C. 371 national application of PCT/DK94/00371 filed Oct. 5, 1994, which is incorporated herein by reference.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/DK94/00371 |
10/5/1994 |
|
|
8/22/1996 |
8/22/1996 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO95/21247 |
8/10/1995 |
|
|
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4536182 |
Tatin |
Aug 1985 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
WO9100353 |
Jan 1991 |
WOX |
WO9116423 |
Oct 1991 |
WOX |
WO 9402597 |
Feb 1994 |
WOX |
WO 9418314 |
Aug 1994 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Esteil et al, "Engineering an Enzyme by Site-Directed Mutagenesis to be Resistant to Chemical Oxidation", J. Biol. Chem, 260(11), Jun., 1985, pp. 6518-6521. |