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Preparation method of hemicelluloses-based antibacterial antioxidant

A hemicellulose and anti-oxidant technology, applied in the field of green chemistry, can solve the problems of poor anti-oxidation effect and no antibacterial properties, and achieve the effect of enhancing antibacterial properties, reducing toxicity, and wide application prospects

Active Publication Date: 2012-07-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Commonly used food additives often only have a single function, such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) are commonly used antioxidants in food processing, but they do not exhibit antibacterial properties
Commonly used preservatives such as sorbic acid and benzoic acid have excellent antibacterial properties, but poor antioxidant effects

Method used

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  • Preparation method of hemicelluloses-based antibacterial antioxidant
  • Preparation method of hemicelluloses-based antibacterial antioxidant
  • Preparation method of hemicelluloses-based antibacterial antioxidant

Examples

Experimental program
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Embodiment 1

[0023] Dissolve 4g chitosan (DD, 90%; DP, 2-5 ) in 100 ml of acetic acid solution 1% (v / v), add 0.667 g ZnSO under magnetic stirring 4 ·H 2 O powder, adjust the pH to 5.0 with 5 g / L sodium acetate, and keep stirring for 5-6 h until coordination equilibrium. Stirring was stopped, and 200 mL of acetone:ethanol mixed solution with a volume ratio of 1:1 was added to the solution to obtain a pale yellow precipitate. The precipitate was separated by suction filtration under reduced pressure, washed with 500 mL of absolute ethanol, and filtered again under reduced pressure to remove the detergent and elute unreacted ions. Wash twice with absolute ethanol, filter the precipitate, and dry in vacuum to obtain chitosan / zinc complex. Weigh 1 g chitosan / zinc complex and dissolve it in 100 mL acetic acid solution 1% (v / v), add 4 g hemicellulose under magnetic stirring, adjust the pH to 6.0 with 1 mol / L NaOH, and then 100 ℃ oil bath reaction for 2 hours. After cooling in an ice-water bat...

Embodiment 2

[0025] Dissolve 4 g of chitosan (DD, 90%; DP, 2-8) in 100 ml of acetic acid solution 1% (v / v), add 0.667 g of ZnSO under magnetic stirring 4 ·H 2 O powder, adjust the pH to 6.0 with 5 g / L sodium acetate, and keep stirring for 5-6 h until coordination equilibrium. Stirring was stopped, and 200 mL of acetone:ethanol mixed solution with a volume ratio of 1:1 was added to the solution to obtain a white precipitate. The precipitate was separated by suction filtration under reduced pressure, the precipitate was washed with 500 mL of absolute ethanol, and the detergent and unreacted ions eluted were removed by suction filtration under reduced pressure again. Wash twice with absolute ethanol, filter the precipitate, and dry in vacuum to obtain chitosan / zinc complex. Weigh 1g chitosan oligosaccharide / zinc complex and dissolve it in 100mL acetic acid solution 1% (v / v), add 4g hemicellulose under magnetic stirring, adjust the pH to 8.0 with 1mol / L NaOH, then react in an oil bath at 100...

Embodiment 3

[0027] 4g oligochitosan (DD, 95%; DP, 2-5 ) was dissolved in 100 ml of acetic acid solution 1% (v / v), and 0.667g ZnSO was added under magnetic stirring 4 ·H 2 O powder, adjust the pH to 6.0 with 5g / L sodium acetate, and keep stirring for 5-6h until coordination equilibrium. Stirring was stopped, and 200 mL of acetone:ethanol mixed solution with a volume ratio of 1:1 was added to the solution to obtain a white precipitate. The precipitate was separated by suction filtration under reduced pressure, the precipitate was washed with 500 mL of absolute ethanol, and the detergent and unreacted ions eluted were removed by suction filtration under reduced pressure again. Wash twice with absolute ethanol, filter the precipitate, and dry in vacuum to obtain chitosan / zinc complex. Weigh 1g chitosan oligosaccharide / zinc complex and dissolve it in 100mL acetic acid solution 1% (v / v), add 4g hemicellulose under magnetic stirring, adjust the pH to 9.0 with 1mol / L NaOH, and then react in an ...

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Abstract

The invention discloses a method for preparing a hemicelluloses-based antibacterial antioxidant. The method comprises the steps: coordinating chitosan oligosaccharide and transition metal zinc ion, precipitating with acetone and ethanol mixed solvent, washing and drying to obtain chitosan oligosaccharide / zinc complex; and preparing a solution of the chitosan / zinc complex, adding a proper amount of hemicellulose, reacting at 80-100 DEG C and pH of 6.0-9.0 for 2-5h, quickly cooling, then adding alcohol for precipitating, washing and drying to obtain the product. The antibacterial antioxidant prepared by the method has excellent antimicrobial activity and excellent oxidation resistance, and has greatly improved bacteriostasis activity to multiple pathogens; and the novel antibacterial antioxidant has wide application prospects in food, medicine, textile industry and articles for daily use.

Description

technical field [0001] The invention relates to a preparation method of hemicellulose-based antibacterial and antioxidant, belonging to the field of green chemistry. Background technique [0002] Hemicellulose is mainly composed of sugars such as xylose, arabinose, glucose, galactose, mannose, fucose, glucuronic acid and galactose glucuronic acid, and its content in nature is second only to cellulose. It is estimated that plants worldwide produce 3×10 hemicellulose per year 10 Ton. However, due to the low molecular weight, multi-branching and different chemical composition of hemicellulose, the application of hemicellulose is limited, and a large amount of hemicellulose is discarded. Therefore, the development of high value-added products of hemicellulose will significantly improve the biomass economy. [0003] Chitosan is a natural polysaccharide obtained by deacetylating chitin extracted from shrimp and crab shells, and chitosan oligosaccharide is degraded from chitosan....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N43/16A01P1/00C09K15/20C09K15/02C08B37/08C08B37/14
Inventor 杜予民吴述平施晓文张俐娜
Owner WUHAN UNIV
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