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Method for preparing polyesters by enzyme catalysis

A technology for catalytic preparation and polyester, applied in fermentation and other directions, can solve problems such as limited application, and achieve the effect of easy operation and good industrial application prospects.

Inactive Publication Date: 2008-06-25
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its use of expensive and highly toxic lactone as a raw material for polymerization greatly limits its application.

Method used

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  • Method for preparing polyesters by enzyme catalysis
  • Method for preparing polyesters by enzyme catalysis
  • Method for preparing polyesters by enzyme catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 3.0 g of β-hydroxypropionate and different biological enzymes at a certain concentration were reacted at 50° C. under a reduced pressure of 70 mmHg to obtain a white polyhydroxypropionate solid product.

[0020] Detection method: Use gas chromatography Agilent6890 for monomer conversion, DM-5MS column, nitrogen as carrier gas, flow rate 3.0ml / min. Programmed temperature: initial temperature 60°C to 280°C (20°C / min), keep for 10min. Toluene as an internal standard.

[0021] Polymer molecular weight is detected by GPC: Waters HPLC 2695 is equipped with 510 pumps, 717 autosamplers, and 2414 refraction detectors, and the chromatographic columns are styragel@HT3, styragel@HT5 and styragel@HT6E Tolene series columns; chloroform (HPLC-grade ) as eluent, flow rate 1.0mL / min. Narrowly distributed polystyrene was purchased from Polymer Laboratories with molecular weight from 500 to 3,000,000 as a standard. Polymer molecular weight was calculated using waters authorized software. ...

Embodiment 2

[0025] 3.0 g of β-hydroxypropionate and 30 mg of biological enzyme (Novozyme435) were reacted under reduced pressure at 30° C. to obtain a white polyhydroxy ester solid product. Gas chromatography detects that its conversion rate is 66.2%;

Embodiment 3

[0027] 3.0 g of β-hydroxypropionate and 30 mg of biological enzyme (Novozyme435) were reacted under reduced pressure at 70° C. to obtain a white polyhydroxy ester solid product. Gas chromatography detects that its conversion rate is 59.8%;

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Abstract

The invention discloses a method for preparing the polyester through the enzyme catalysis. In the method, a reaction is carried out so as to prepare the polyester under a very gentle conditions with the Beta-hydroxy carboxylic ester as reactant and enyzymes Novozyme435, Lipase from thermomyces lanuginosus PPL or Lipase PS as catalysts. The invention is a solvent-free reaction system, has a high ezyme stability and can be used for carrying out continuous catalytic reactions for many times, and the chemical monomers which can go to scale and the engineering enzyme are adopted as catalysts in the polymerization, thus greatly lowering the cost of the product.

Description

technical field [0001] The invention relates to a method for preparing polyester by enzymatic catalysis. Specifically, the invention relates to a method for catalyzing and synthesizing polyester by using a β-hydroxy carboxylate compound as a reactant and using a biological enzyme as a catalyst. Background technique [0002] Polyhydroxycarboxylates (PHAs) are a class of biocompatible and biodegradable polymers with hydroxycarboxylates as structural recurring units. It is mainly used in medicine such as drug capsules, surgical sutures and artificial bones, etc. and replaces polyolefin non-biodegradable plastics. At present, such polymers are mainly synthesized by microbial fermentation. Shen Zhongyao, Wu Guifang, Wu Qingyu A method for constructing genetically recombinant cyanobacteria to produce poly-β-hydroxybutyrate. [P]CN1309183A.. It has a long production cycle, low output, and due to the particularity of biomass and conversion methods, the resulting polymer structure i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G67/00C12P7/00
Inventor 赵永杰夏春谷陈静
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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