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Pectin graft copolymer as well as preparation method and application thereof

A technology of graft copolymer and copolymerization reaction, applied in the field of pectin graft copolymer and its preparation, to achieve the effects of weakening hydrogen bond force, increasing antioxidant activity and broad application prospects

Active Publication Date: 2022-07-08
HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report about the graft copolymer of pectin and coumaric acid

Method used

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  • Pectin graft copolymer as well as preparation method and application thereof
  • Pectin graft copolymer as well as preparation method and application thereof
  • Pectin graft copolymer as well as preparation method and application thereof

Examples

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preparation example Construction

[0030] The invention provides a preparation method of pectin graft copolymer, comprising the following steps:

[0031] Mix pectin, coumaric acid, ascorbic acid and solvent to obtain a mixed solution;

[0032] carrying out ultrasonic-microwave degradation treatment on the mixed solution to obtain a degradation treatment solution;

[0033] The degradation treatment solution and the hydrogen peroxide solution are mixed to carry out a graft copolymerization reaction to obtain a pectin graft copolymer.

[0034] In the present invention, pectin, coumaric acid, ascorbic acid and solvent are mixed to obtain a mixed solution. In the present invention, the pectin is preferably citrus pectin, and the molecular weight of the citrus pectin is preferably 100-200KDa; the present invention has no special requirements on the source of the citrus pectin, and commercially available citrus pectin or You can extract by yourself. In the present invention, the solvent is preferably an acetic acid...

Embodiment 1

[0047] Accurately weigh 0.1 g of citrus pectin and dissolve it in 50 mL of 1% acetic acid solution, then add ascorbic acid and 1 g of coumaric acid, control the concentration of ascorbic acid in the mixed solution to be 0.075 mol / L, and mix the mixture with sodium hydroxide and hydrochloric acid. The pH value of the solution was adjusted to 6.0, and ultrasonic-microwave degradation treatment was carried out for 1 min under the condition of ultrasonic power of 50W and microwave power of 480W to obtain a degradation treatment solution. Nitrogen gas was slowly introduced into the reaction flask containing the degradation treatment solution, and hydrogen peroxide solution was added to start the reaction after 60 min. The concentration of hydrogen peroxide in the reaction system was controlled to be 0.075 mol / L, and the reaction was continued for 2 h under nitrogen conditions. The reacted mixture was poured into a dialysis bag with a molecular weight of 14,000 Da, dialyzed with deio...

Embodiment 2

[0049] Accurately weigh 0.1 g of citrus pectin and dissolve it in 50 mL of 1% acetic acid solution, then add ascorbic acid and 1 g of coumaric acid, control the concentration of ascorbic acid in the mixed solution to be 0.15 mol / L, and mix the mixture with sodium hydroxide and hydrochloric acid. The pH value of the solution was adjusted to 6.0, and the ultrasonic-microwave degradation treatment was carried out for 3 min under the condition of ultrasonic power of 50W and microwave power of 482W to obtain a degradation treatment solution. Nitrogen gas was slowly introduced into the reaction flask containing the degradation treatment solution, and hydrogen peroxide solution was added to start the reaction after 60 min. The concentration of hydrogen peroxide in the reaction system was controlled to be 0.075 mol / L, and the reaction was continued for 2 h under nitrogen conditions. The reacted mixture was poured into a dialysis bag with a molecular weight of 14,000 Da, dialyzed with d...

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Abstract

The invention relates to the technical field of pectin modification, and provides a pectin graft copolymer as well as a preparation method and application thereof. According to the invention, a redox system is combined with graft modification, the pectin is subjected to graft modification by using cumaric acid to increase the solubility of the pectin, and meanwhile, the pectin is subjected to ultrasonic-microwave degradation treatment to aggravate the fracture of a main chain or a branch chain of the pectin, so that the molecular weight of the pectin grafted copolymer is reduced, and the solubility of the pectin grafted copolymer is increased; phenolic acid groups are introduced into pectin molecules through graft copolymerization, and the antioxidant activity of pectin can be improved. The pectin grafted copolymer prepared by the preparation method disclosed by the invention is good in solubility and high in antioxidant activity, and has a wide application prospect in foods, health-care products and medicines.

Description

technical field [0001] The invention relates to the technical field of pectin modification, in particular to a pectin graft copolymer and a preparation method and application thereof. Background technique [0002] Pectin is a natural macromolecular polysaccharide compound in plants. Pectin is widely present in the cell walls and inner layers of plant fruits, roots, stems and leaves. Pure pectin is generally white or beige solid powder with a slightly specific odor. The main component of pectin is D-galacturonic acid, which can be widely used as a gelling agent, thickening agent and stabilizer in food. In addition, pectin also has biological activities, including anti-diarrhea, anti-cancer, cholesterol-lowering, diabetes treatment and other effects, and has played a significant role in various reaction mechanisms and metabolic pathways; in addition, pectin also has good The sterilization, antibacterial, hemostasis and other effects, as well as immunological properties, anti...

Claims

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Application Information

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IPC IPC(8): C08B37/06A23L33/125A61P39/06
CPCC08B37/0045A23L33/125A61P39/06A23V2002/00A23V2200/30A23V2250/5072Y02A40/90
Inventor 左锋杨鹄隽王坤李丹许馨予
Owner HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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