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Method for measuring crust amine and chitin content in crust amine fibre and cotton blending product

A technology of chitosan fibers and determination methods, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of unfavorable environmental protection and the inability to effectively characterize chitosan and chitin. content, the toxicity of the solvent formic acid, etc., to achieve the effect of convenient operation, high measurement accuracy and accuracy, and low toxicity

Inactive Publication Date: 2009-02-18
天奇智联(杭州)实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple, there are two defects: first, the solvent formic acid is more toxic, which is not conducive to environmental protection; second, both chitosan and chitin can be dissolved in formic acid or acetic acid solution, and it cannot effectively characterize chitosan and chitin The specific content, only the total content of the two

Method used

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  • Method for measuring crust amine and chitin content in crust amine fibre and cotton blending product
  • Method for measuring crust amine and chitin content in crust amine fibre and cotton blending product
  • Method for measuring crust amine and chitin content in crust amine fibre and cotton blending product

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specific Embodiment approach

[0017] The reagent preparation method used in the present invention is:

[0018] a. Preparation of PVSK solution: The relative molecular mass of PVSK chains is expressed in C 2 h 3 OSO 3 K is calculated as 162.204, weigh 0.422g, and make 1000ml solution with deionized water, the concentration is 0.0025mol / L.

[0019] b. Preparation of T.B indicator: Weigh 0.3g T.B and make 30ml solution with deionized water, the mass concentration is 0.1%.

[0020] (1) The steps for the determination of chitosan content in chitosan fiber and cotton blended products are:

[0021] a. Correctly weigh 1g of the substance to be tested after drying and constant weight to the accuracy of 0.01g, cut it into pieces and put it in a 200ml beaker, add 60 ~ 100ml of acetic acid solution with a concentration of 1.5% ~ 5%, put it into the rotor, and set it at 20 ~ Stir at a medium speed at 40°C to dissolve for 1-3 hours, let stand, and set aside.

[0022] b. Use a pipette to transfer 5.0ml of the soluti...

Embodiment 1

[0040] 1) Acetic acid solution with a concentration of 1.5% by weight dissolves chitosan fiber and cotton fiber with a chitosan content of 90% and a chitin content of 10% at a ratio of 10:90, chitosan fiber and cotton blended yarn The weight ratio of the weight to the acetic acid solution is 1:60; the dissolution temperature is 20°C, and the dissolution time is 1h, and the soluble chitosan fiber and the insoluble cotton fiber are separated to obtain the chitosan fiber solution, which is anionic polyelectrolyte polyvinyl potassium sulfate As a titrant, the cationic blue organic dye toluidine blue is used as an indicator, and the chitosan content in the chitosan fiber and cotton blended yarn is measured by colloid titration;

[0041] 2) Treat the chitosan fiber and cotton blended yarn to be tested with a sodium hydroxide solution with a concentration of 30% by weight, and the weight ratio of the chitosan fiber and cotton blended yarn to the sodium hydroxide solution is 1:40; The...

Embodiment 2

[0048] 1) Acetic acid solution with a concentration of 5% by weight dissolves chitosan fiber with 80% chitin content and 20% chitosan fiber and cotton fiber blended yarn at a ratio of 5:95, the weight of the chitosan fiber and cotton blended product The weight ratio with the acetic acid solution is 1:100; the dissolution temperature is 40°C, and the dissolution time is 3 hours to separate the soluble chitosan fibers and insoluble cotton fibers to obtain a chitosan fiber solution, which is titrated with the anionic polyelectrolyte potassium polyvinyl sulfate Agent, with cationic blue organic dye toluidine blue as indicator, adopt the colloid titration method to measure the content of chitosan in the chitosan fiber and cotton blended yarn;

[0049] 2) Treat the chitosan fiber and cotton blended yarn to be tested with a sodium hydroxide solution with a concentration of 45% by weight, and the weight ratio of the chitosan fiber and cotton blended yarn to the sodium hydroxide solutio...

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Abstract

The invention discloses a chitosan and chitin content measurement method in the chitosan fiber and cotton blended products. Acetic acid solution is used to separate the chitosan fiber on the blended product, and the chitosan content in the dissolved solution is measured through colloidal titration so as to obtain the chitosan content in the chitosan fiber and the cotton blended product; the chitosan fiber and the cotton blended product are treated with a sufficient amount of concentrated alkali to enable the chitin in the chitosan fiber to be fully converted into chitosan; then the chitosan content in the chitosan fiber and the cotton blended product after alkali treatment is measured according to the method for measuring the chitosan, and the chitosan content in the chitosan fiber and the cotton blended product is deducted from the measured chitosan content so as to obtain the chitin content in the chitosan fiber and the cotton blended product. The chitosan and chitin content measurement method has high measurement precision and accuracy, small toxicity of the reagent, less environmental pollution and easy operation, which provides a convenient, scientific and feasible detection method for the vast number of small and medium-sized enterprises and primary inspection agencies.

Description

technical field [0001] The invention relates to a method for determining the content of chitosan and chitin in chitosan fiber and cotton blended products. Background technique [0002] Chitosan is the deacetylation product of chitin, and a new type of functional fiber—chitosan fiber can be produced by wet spinning chitosan. Chitosan fiber is the only positively charged regenerated fiber in nature, which has considerable biological activity (such as excellent antibacterial, deodorant, excellent moisture absorption, moisturizing and biocompatibility properties), can help wound healing, and effectively protect human skin. However, chitosan fibers are expensive and are mainly used in the production of medical textiles such as surgical sewing thread, burns on human skin, gauze for scalds, and bandages. Blending chitosan fiber with cotton, through the corresponding dyeing and finishing process, on the premise of ensuring the function of the blended product, the production cost of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 吴明华吴玉泉易玲敏董建朋杜维强
Owner 天奇智联(杭州)实业有限公司
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