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Glucose glycosylation rice bran protein-chitosan functional composite membrane and preparation method thereof

A rice bran protein and glucose technology, which is applied in the field of glucose glycosylated rice bran protein-chitosan functional composite membrane and its preparation field, and achieves the effects of improving solubility and sulfhydryl content, being economical, and improving application value.

Pending Publication Date: 2022-07-29
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the existing single rice bran protein film, the present invention provides a glucose glycosylated rice bran protein-chitosan functional composite film and its preparation method

Method used

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  • Glucose glycosylation rice bran protein-chitosan functional composite membrane and preparation method thereof
  • Glucose glycosylation rice bran protein-chitosan functional composite membrane and preparation method thereof
  • Glucose glycosylation rice bran protein-chitosan functional composite membrane and preparation method thereof

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Embodiment 1

[0033] A preparation method of a glucose glycosylated rice bran protein-chitosan functional composite membrane, the specific steps are as follows:

[0034] 1) Extract rice bran protein from defatted rice bran by alkali-soluble acid precipitation method: mix defatted rice bran and distilled water at a ratio of 1:9 to liquid, adjust the pH of the mixture to 9.5 with 1 mol / L NaOH, and stir at 50°C for 2 hours. After the rice bran residue was removed by filtration, the filtrate was centrifuged at 6000 r / min for 15 min, and the pH of the centrifuged supernatant was adjusted to 4.5 with 1 mol / L HCl. 1:5 dilution, adjust pH to 7.0, freeze-dry at -55°C and 0.5mbar for 48h to obtain rice bran protein;

[0035] 2) Glucose glycosylation-modified rice bran protein: take 3 g of the rice bran protein obtained in step 1), dissolve it in 100 mL, pH 9, 50 mmol / L phosphate buffer solution, add 3 g of glucose, stir evenly, and then adjust the pH to 9.0 , stirred in a water bath at 85°C for 90mi...

Embodiment 2

[0040] A preparation method of a glucose glycosylated rice bran protein-chitosan functional composite membrane, the specific steps are as follows:

[0041] 1) Extract rice bran protein from defatted rice bran by alkali-soluble acid precipitation method: mix defatted rice bran and distilled water with a material-to-liquid ratio of 1:9, use 1 mol / L NaOH to adjust the pH of the mixture to 9.5, and stir at 50 °C for 2 hours. After the rice bran residue was removed by filtration, the filtrate was centrifuged at 6000r / min for 15min, and the supernatant after centrifugation was adjusted to pH 4.5 with 1mol / L HCl. After centrifugation at 6000r / min for 15min again, the precipitate was collected, and the precipitate was mixed with distilled water in a solid-liquid ratio. 1:5 dilution, adjust pH to 7.0, freeze-dry at -50°C and 0.45mbar for 48h to obtain rice bran protein;

[0042] 2) Glucose glycosylation-modified rice bran protein: take 3 g of the rice bran protein obtained in step 1), ...

Embodiment 3

[0047] A preparation method of a glucose glycosylated rice bran protein-chitosan functional composite membrane, the specific steps are as follows:

[0048] 1) Extract rice bran protein from defatted rice bran by alkali-soluble acid precipitation method: mix defatted rice bran and distilled water with a material-to-liquid ratio of 1:9, use 1 mol / L NaOH to adjust the pH of the mixture to 9.5, and stir at 50 °C for 2 hours. After the rice bran residue was removed by filtration, the filtrate was centrifuged at 6000r / min for 15min, and the supernatant after centrifugation was adjusted to pH 4.5 with 1mol / L HCl. After centrifugation at 6000r / min for 15min again, the precipitate was collected, and the precipitate was mixed with distilled water in a solid-liquid ratio. 1:5 dilution, adjust pH to 7.0, freeze-dry at -50°C and 0.43mbar for 48h to obtain rice bran protein;

[0049] 2) Glucose glycosylation-modified rice bran protein: take 3 g of the rice bran protein obtained in step 1), ...

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Abstract

The invention relates to a glucose glycosylation rice bran protein-chitosan functional composite membrane and a preparation method thereof, and belongs to the field of novel biomass packaging materials. The preparation method comprises the following steps: extracting rice bran protein from defatted rice bran by adopting an alkali-solution and acid-isolation method; the rice bran protein is modified through glucose glycosylation by utilizing a Maillard reaction; blending the glucose glycosylated rice bran protein solution and the chitosan solution, stirring and plasticizing to obtain a composite membrane solution; and casting the composite membrane liquid on a smooth plastic culture dish, drying, softening and uncovering the membrane to obtain the glucose glycosylation rice bran protein-chitosan functional composite membrane. The prepared composite film is smooth, compact, good in barrier property, mechanical strength, oxidation resistance, antibacterial activity and the like, economical, low in cost, environmentally friendly and degradable, and a new thought is provided for development of novel biomass packaging materials.

Description

technical field [0001] The invention belongs to the field of novel biomass packaging materials, and in particular relates to a glucose glycosylated rice bran protein-chitosan functional composite membrane and a preparation method thereof. Background technique [0002] According to the survey, petroleum-based plastic packaging materials are widely used in the market, mainly because plastic materials have the advantages of relatively low price, strong mechanical properties, good barrier properties and heat sealing ability. However, due to its non-degradable characteristics, it has caused a lot of pollution to the ecological environment. In contrast, bio-based materials have the advantages of being degradable and renewable. In recent years, with the improvement of living standards, people's requirements for food nutrition, safety, stability and health have been continuously improved. Therefore, the research and improvement of biomass packaging materials has attracted widesprea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L89/00C08L5/08C08H1/00
CPCC08J5/18C08H1/00C08J2389/00C08J2405/08
Inventor 王娜孟才云肖志刚李铁晶胡风庆董思林赵凤芹
Owner LIAONING UNIVERSITY
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