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Method for preparing high-toughness cottonseed protein based composite membrane

A technology of cottonseed protein and composite membrane, which is applied in the field of protein-based membrane materials, can solve the problems of reducing tensile strength and elongation at break, and achieve the effect of enhancing tensile strength, enhancing elongation at break, and broadening applications

Active Publication Date: 2019-12-31
ZHONGKAI UNIV OF AGRI & ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing a high-toughness cottonseed protein film, aiming at solving the problem that existing alcohol plasticizers only increase the elongation at break of the protein-based film material and reduce the tensile strength and aldehyde crosslinking. A single agent improves the tensile strength of protein-based membrane materials and reduces the elongation at break

Method used

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  • Method for preparing high-toughness cottonseed protein based composite membrane
  • Method for preparing high-toughness cottonseed protein based composite membrane

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preparation example Construction

[0031] The invention provides a method for preparing a high-toughness cottonseed protein-based composite film comprising the following steps:

[0032] (1) Extraction of refined cottonseed protein:

[0033] S1: Mix and stir the cottonseed meal and the newly prepared alkaline solution according to the mass ratio of 1:10 to 1:15, and obtain the crude cottonseed protein extract after centrifugation and filtration;

[0034] S2: put the crude cottonseed protein extract into a dialysis bag, and dialyze in deionized water at 4-25°C for 5-7 days;

[0035] S3: Collect the cottonseed protein solution after dialysis, and adjust the pH to 4.5-5.5 with dilute hydrochloric acid, and a large amount of protein precipitation can be seen;

[0036] S4: Centrifuge, separate and dry the obtained protein precipitate to obtain pure cottonseed protein;

[0037] (2) Preparation of cottonseed protein solution: mixing cottonseed protein with a mass ratio of 1:5 to 1:30 and an inorganic alkali solution ...

Embodiment 1

[0053] Dissolve 0.60g cottonseed protein in 9.4g sodium hydroxide solution (pH=10) to prepare 10g 6wt% cottonseed protein solution. 1.5g of PVA was dissolved in 23.5g of deionized water to prepare 25g of 6wt% PVA solution. According to the cottonseed protein:PVA mass ratio of 3:7, 9g of cottonseed protein solution was added to 21g of PVA solution, and stirred in a constant temperature water bath at 50°C for 1 hour to obtain solution A. Accurately drop 0.090 g of pure triethanolamine solution into solution A, and stir in a constant temperature water bath at 50° C. for 1.5 hours to obtain solution B. After the solution B was cooled to room temperature, it was poured into a polypropylene mold, and placed horizontally in a constant temperature and humidity box at 25°C and 50%RH to dry for 12 hours.

Embodiment 2

[0055] Dissolve 0.60g cottonseed protein in 9.4g sodium hydroxide solution (pH=10) to prepare 10g 6wt% cottonseed protein solution. 1.5g of PVA was dissolved in 23.5g of deionized water to prepare 25g of 6wt% PVA solution. According to the cottonseed protein:PVA mass ratio of 3:7, 9g of cottonseed protein solution was added to 21g of PVA solution, and stirred in a constant temperature water bath at 50°C for 1 hour to obtain solution A. Accurately drop 0.180 g of pure triethanolamine solution into solution A, and stir in a constant temperature water bath at 50° C. for 1.5 hours to obtain solution B. After the solution B was cooled to room temperature, it was poured into a polypropylene mold, and placed horizontally in a constant temperature and humidity chamber at 25°C and 50% RH to dry for 12 hours.

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Abstract

The invention discloses a method for preparing a high-toughness cottonseed protein based composite membrane. The method comprises the following steps: (1) refining cottonseed protein; (2) preparing acottonseed protein solution and a water-soluble high polymer solution; (3) adding the cottonseed protein solution into the water-soluble high polymer solution, and carrying out uniform stirring at a certain temperature, so as to obtain a solution A; (4) adding a tertiary amine based alcoholic reagent into the solution A, and carrying out stirring for 1 to 5 hours in a thermostatic water bath withthe temperature of 40 DEG C to 60 DEG C, so as to obtain a solution B; and (5) after the solution B is cooled, preparing the cottonseed protein based composite membrane with relatively good toughnessby a casting method. Water-soluble high polymers include, but not limited to, polyvinyl alcohol, polyethylene oxide and gelatin; the addition level of the tertiary amine based alcoholic reagent is 5%to 30% the total mass of the cottonseed protein and the water-soluble high polymers; and a mass ratio of the cottonseed protein to the water-soluble high polymers is (9: 1) to (1: 9). According to themethod, on one hand, the tertiary amine based alcoholic reagent serves as a plasticizer, and thus, the elongation at break of the protein membrane is increased; and on the other hand, the tertiary amine based alcoholic reagent serves as a physical cross-linker, cross-linked bridges are formed between molecular chains of the cottonseed protein and the high polymers through hydrogen bonds under theaction of tertiary amine groups with relatively high electronegativity, a novel cross-linked network is formed, and thus, the tensile strength of the protein membrane is enhanced. Thereby, the high-toughness cottonseed protein based composite membrane is prepared.

Description

technical field [0001] The invention relates to the technical field of protein-based membrane materials, in particular to a method for preparing a high-toughness cottonseed protein-based composite membrane. Background technique [0002] Cottonseed meal is an important plant protein resource, which is usually processed into animal feed due to its rich amino acid content and high nutritional value. However, cottonseed protein has not been widely used in the field of membrane materials. This is because the heat treatment process during the extraction of cottonseed oil leads to protein denaturation, which affects the physicochemical properties and processing properties of cottonseed protein. [0003] For some cottonseed protein-based composite films such as cottonseed protein / PVA composite film, cottonseed protein / PEO composite film, cottonseed protein / gelatin composite film, cottonseed protein / starch composite film, etc., some plasticizers (such as glycerin, sorbitol, ethyl al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L89/00C08L29/04C08L71/02C08L3/02
CPCC08J5/18C08J2389/00C08J2429/04C08J2471/02C08J2489/00C08J2403/02C08J2329/04C08J2371/02C08J2303/02
Inventor 丁姣陈文杰尹国强赖锐豪周向阳冯聘娴赖诗敏
Owner ZHONGKAI UNIV OF AGRI & ENG
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