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Method for preparing chitin nanofibers from waste crayfish shells

A technology of nanofibers and chitin, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of difficult large-scale production, difficult processing, high cost, etc., and achieve cost reduction, simple operation, and short time consumption Effect

Active Publication Date: 2017-02-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the raw materials for the production of chitin nanofibers mostly start from chitin, which is expensive, and some physical methods to manufacture chitin nanofibers consume a lot of energy and are difficult to process, so it is difficult to be widely used in large-scale production

Method used

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  • Method for preparing chitin nanofibers from waste crayfish shells
  • Method for preparing chitin nanofibers from waste crayfish shells
  • Method for preparing chitin nanofibers from waste crayfish shells

Examples

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Embodiment 1

[0031] A method for preparing chitin nanofibers by using discarded crayfish shells, comprising the following steps:

[0032] Step 1, preparation of shrimp shell powder

[0033] Collect 1 kg of discarded crayfish shells from catering, wash, boil and dry, then crush (50 mesh), mix with absolute ethanol at a (w / v) ratio of 1:11, and filter with filter paper under ultrasonic assistance at 50°C for 20 hours , washed with water for 3 times, and dried to obtain depigmented shrimp shells. Add degreasing organic reagents to the decolorized shrimp shells according to (w / v) Example 1:11, degrease in a water bath at 60°C, filter through medium-speed filter paper, wash the filter residue with water, and dry in an oven at 70°C to obtain degreasing shrimp shell powder.

[0034] Step 2, preparation of deproteinized shrimp shell powder

[0035] After sterilizing the compound protease aqueous solution with a density of 5%, add the sterilized defatted shrimp shell powder, enzymolyze it in a wa...

Embodiment 2

[0043] A method for preparing chitin nanofibers by using discarded crayfish shells, comprising the following steps:

[0044] Step 1, preparation of shrimp shell powder

[0045] Collect 3 kg of discarded crayfish shells from catering, wash, boil and dry, then crush (50 mesh), mix with absolute ethanol at a (w / v) ratio of 1:15, and filter with filter paper under ultrasonic assistance at 40°C for 17 hours , washed with water for 3 times, and dried to obtain depigmented shrimp shells. Add degreasing organic reagents to the decolorized shrimp shells according to (w / v) Example 1:10, degrease in a water bath at 60°C, filter with medium-speed filter paper, wash the filter residue with water, and dry in an oven at 70°C to obtain degreasing shrimp shell powder.

[0046] Shrimp shell powder.

[0047] Step 2, preparation of deproteinized shrimp shell powder

[0048] After sterilizing the compound protease aqueous solution with a density of 5%, add the sterilized defatted shrimp shell p...

Embodiment 3

[0056] A method for preparing chitin nanofibers by using discarded crayfish shells, comprising the following steps:

[0057] Step 1, preparation of shrimp shell powder

[0058] Collect 5kg of discarded crayfish shells from catering, wash, boil and dry, then crush (50 mesh), mix with absolute ethanol at a (w / v) ratio of 1:14, and filter with filter paper under ultrasonic assistance at 40°C for 15 hours , washed twice with water, and dried to obtain depigmented shrimp shells. Add degreasing organic reagents to the decolorized shrimp shells according to (w / v) Example 1:13, degrease in a water bath at 60°C, filter with medium-speed filter paper, wash the filter residue with water, and dry in an oven at 70°C to obtain degreasing shrimp shell powder.

[0059] Step 2, preparation of deproteinized shrimp shell powder

[0060] After sterilizing the compound protease aqueous solution with a density of 5%, add the sterilized defatted shrimp shell powder, enzymolyze it in a water bath a...

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Abstract

A method for preparing chitin nanofibers from waste crayfish shells includes the steps that the waste crayfish shells are subjected to impurity removal, decoloration and degreasing pre-treatment; protein in the crayfish shells is removed through the enzymic method; the crayfish shells are processed by means of a hydrochloric acid aqueous solution with the volume fraction of 2-3% to remove salt; the processed crayfish shell powder is washed with water and dried to obtain a semi-finished chitin product; the semi-finished chitin product is smashed, stirred and dissolved thoroughly to prepare a chitin solution, a separation agent is slowly added into the chitin solution under the stirring condition so that chitin can be gradually separated out from the solution, pure water is added after the separation agent is removed, a suspension of the chitin nanofibers is obtained through resuspension, the suspension is repeatedly washed with pure water, and the chitin nanofibers can be obtained after water is removed. The chitin nanofibers long in fiber, small in diameter and high in strength can be provided, and the nanofibers can be widely used in the fields of biomedicine, tissue engineering and the like.

Description

technical field [0001] The invention relates to the field of chitin fiber preparation, in particular to a method for preparing chitin nanofibers by using discarded crayfish shells. Background technique [0002] my country is extremely rich in shrimp resources. Crayfish (Procambarus clarkii), native to the southeastern United States, is also known as crayfish. People in China are used to calling it crayfish. It is the most edible freshwater lobster species. It accounts for 70-80% of the whole freshwater lobster production. With the arrival of summer, people around the world will be extremely enthusiastic about eating crayfish, and a large amount of shrimp shell waste will inevitably be produced every year, and shrimp shells contain a lot of high-value substances, especially chitin. The chitin content in the shrimp head and shrimp shell reaches 10%-20%, the protein content reaches 20%-40%, and the calcium content reaches 30%-40%. If these wastes are utilized, great value will...

Claims

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Application Information

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IPC IPC(8): D01F9/00C08B37/08
CPCD01F9/00C08B37/0003C08B37/003
Inventor 陈可泉魏国光张阿磊曹逊欧阳平凯
Owner NANJING UNIV OF TECH
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