Methods and water treatment systems for reducing bisphenol A release

Patent metadata

Field	Value
Publication number	US-9133045-B2
Application number	US-201213978239-A
Country	US
Kind code	B2
Filing date	Jul 11, 2012
Priority date	Jul 11, 2012
Publication date	Sep 15, 2015
Grant date	Sep 15, 2015

Abstract

Disclosed are methods, compositions and systems pertaining to polymer coatings that entrap enzymes, specifically enzymes capable of reducing carboxylic acids.

First claim

What is claimed is:

1. A method of treating a composition comprising a bisphenol A (BPA) precursor, the method comprising:
contacting the composition comprising the BPA precursor with a carboxylic acid-reducing composition, wherein the carboxylic acid-reducing composition comprises a carboxylic acid-reducing enzyme and organic silane, and
wherein the BPA precursor comprises a polymer that produces BPA monomers upon polymer hydrolysis.

2. The method of claim 1 , wherein the BPA precursor comprises polycarbonate, polyester carbonate, or an epoxy resin.

3. The method of claim 1 , wherein the organic silane is formed from polymerization of methyltrimethoxysilane and gamma-aminopropyltriethoxysilane.

4. The method of claim 1 , wherein the carboxylic acid-reducing enzyme is entrapped in the organic silane.

5. The method of claim 1 , wherein at least one carboxylic acid-reducing enzyme is selected from carboxylate reductase, aldehyde ferredoxin oxidoreductase, formaldehyde ferredoxin oxidoreductase, glyceraldehyde-3-phosphate ferredoxin oxidoreductase, and (2R)-hydroxycarboxylate-viologen-oxidoreductase.

6. The method of claim 1 , wherein the carboxylic acid-reducing composition is in the form of a gel suspended in an adhesive film.

7. The method of claim 1 , wherein the carboxylic acid-reducing composition is contacted with at least a portion of the composition comprising the BPA precursor.

8. The method of claim 1 , wherein contacting comprises polymerizing the carboxylic acid-reducing composition directly onto at least a portion of the composition comprising the BPA precursor.

9. A method of treating water that contains 2,2-bis(4-hydroxyphenyl)propanoic acid (BPA-COOH), the method comprising:
contacting the water with (a) at least one carboxylic acid-reducing enzyme entrapped in a polymer, and (b) at least one carbonyl-reducing composition under conditions wherein the BPA-COOH is degraded.

10. The method of claim 9 , wherein at least one carboxylic acid-reducing enzyme comprises one or more of carboxylate reductase, aldehyde ferredoxin oxidoreductase, formaldehyde ferredoxin oxidoreductase, glyceraldehyde-3-phosphate ferredoxin oxidoreductase, and (2R)-hydroxycarboxylate-viologen-oxidoreductase.

11. The method of claim 9 , wherein the carbonyl-reducing composition is one or more of sodium borohydride, lithium aminoborohydride, and alcohol dehydrogenase.

12. The method of claim 9 , wherein the carboxylic acid-reducing enzyme and the carbonyl-reducing composition are contacted with the water sequentially.

13. The method of claim 9 , wherein the polymer is organic silane.

14. The method of claim 13 , wherein the organic silane is formed from polymerization of methyltrimethoxysilane and gamma-aminopropyltriethoxysilane.

15. A water treatment system that contains 2,2-bis(4-hydroxyphenyl)propanoic acid (BPA-COOH), comprising:
(a) an inlet to a treatment area, wherein the treatment area holds (i) a carboxylic acid-reducing composition comprising at least one carboxylic acid-reducing enzyme entrapped in polymerized organic silane, and (ii) at least one carbonyl-reducing composition; and
(b) an outlet from the treatment area.

16. The water treatment system of claim 15 , wherein the organic silane is formed from polymerization of methyltrimethoxysilane and gamma-aminopropyltriethoxysilane.

17. The water treatment system of claim 15 , wherein at least one carboxylic acid-reducing enzyme comprises one or more of carboxylate reductase, aldehyde ferredoxin oxidoreductase, formaldehyde ferredoxin oxidoreductase, glyceraldehyde-3-phosphate ferredoxin oxidoreductase, and (2R)-hydroxycarboxylate-viologen-oxidoreductase.

18. The water treatment system of claim 15 , wherein the at least one carbonyl-reducing compound is one or more of sodium borohydride, lithium aminoborohydride, and alcohol dehydrogenase.

19. The water treatment system of claim 15 , wherein the carboxylic acid-reducing composition is in the form of one or more of a non-perforated sheet, a perforated sheet, or beads.

20. The water treatment system of claim 15 , wherein the treatment area further comprises a first chamber that holds the carboxylic acid-reducing composition and a second chamber that holds the carbonyl-reducing composition.

Assignees

• Xu Yanjie
• Cabrera Robert
• Empire Technology Dev Llc

Inventors

• Xu Yanjie
• Cabrera Robert

Classifications

• C08K2201/019

  the composition being defined by the absence of a certain additive · CPC title

• C12N11/08

  the carrier being a synthetic polymer · CPC title

• C02F3/342 Primary

  characterised by the enzymes used · CPC title

• C08K5/544

  containing nitrogen · CPC title

• C02F1/70 Primary

  by reduction {(C02F1/4676 takes precedence)} · CPC title