Short fiber food waste residue-based nano cellulose and preparation method thereof

A technology of nano-cellulose and short fibers, which is applied in the fields of pulping with salt/acid anhydride, pretreatment with water/steam, washing/replacing pulp treatment liquid, etc. It can solve the problems of large particle size range, long hydrolysis time, and utilization rate of less than 10 % and other problems, to achieve the effect of weak compactness of crystal region, large proportion of amorphous region and loose structure of crystal region

Inactive Publication Date: 2011-09-14
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have successively studied the preparation of nanocellulose by acid hydrolysis using long fibers such as cotton fiber, bamboo fiber, mulberry fiber, banana stem fiber, and sisal fiber as raw materials. Disadvantages such as large size and limited application in food and medicine
[0004] In the production of corn starch, potato starch, bean starch, bean curd and other products, a large amount of waste residue is produced, which is rich in cellulose. The utilization rate of these food residue cellulose in my country is less than 10%, and most of them are used as Feed, resulting in a great waste of food waste cellulose resources
The structure and properties of dietary cellulose with short cellulose as the main body are quite different from those of long cellulose, resulting in differences in preparation process conditions and properties of nanocellulose

Method used

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  • Short fiber food waste residue-based nano cellulose and preparation method thereof
  • Short fiber food waste residue-based nano cellulose and preparation method thereof
  • Short fiber food waste residue-based nano cellulose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of nanocellulose with sweet potato residue

[0035] Use a colloid mill to refine the sweet potato residue to less than 50 μm, wash it twice with water, adjust the washed sweet potato residue to a mass concentration of 30% with phosphate buffer, heat it to 100°C and keep it for 10 minutes, add an amount equivalent to the dry weight of sweet potato residue 2% high-temperature α-amylase, hydrolyzed at 90°C for 1 hour, then washed 3 times with water, and dehydrated by centrifugation to obtain sweet potato slag fiber. For details, see figure 1 ; Send the sweet potato residue fiber into the acid hydrolysis tank with stirrer, add the hydrochloric acid aqueous solution that is equivalent to 10 times the weight of the sweet potato residue fiber, and the concentration is 2mol / L, after stirring evenly, under the condition of 85 ℃, stir at 300 rpm React for 240 minutes. After the hydrolysis, add 2% sodium hydroxide aqueous solution to neutralize the reaction s...

Embodiment 2

[0036] Example 2 Preparation of Nanocellulose from Potato Residue

[0037] Use a colloid mill to refine the potato residues below 40 μm, wash them twice with clean water, adjust the washed potato residues to a mass concentration of 35% with phosphate buffer, heat them to 100°C for 10 minutes, and add an amount equivalent to the mass fraction of potato residues 2% high-temperature α-amylase, hydrolyzed at 90°C for 1 hour, then washed 3 times with water, centrifuged and dehydrated to obtain potato slag fibers, sent the potato slag fibers into an acid hydrolysis tank with a stirrer, and added Add a hydrochloric acid aqueous solution with a concentration of 3mol / L that is 20 times the mass of potato residue fibers, stir evenly, and react at a low speed of 100-300 rpm for 200 minutes at 85°C, and add hydrogen with a concentration of 2% after the hydrolysis is completed Sodium oxide aqueous solution neutralizes the reaction solution to pH 6.5 to obtain acid hydrolyzed potato residue...

Embodiment 3

[0038] Example 3 Preparation of Nanocellulose from Wheat Bran

[0039]Add wheat bran to 5 times of water and mix, use a colloid mill to refine the wheat bran to less than 80 μm, wash it with water for 3 times, adjust the washed wheat bran to a mass concentration of 35% with a phosphate buffer, and pH9 .0, add alkaline protease equivalent to 1% of the dry weight of wheat bran, and hydrolyze it for 2 hours at 50°C; then adjust the solution to pH 4.5, heat it to 100°C for 5 minutes, and add 2 % high-temperature α-amylase, hydrolyzed at 90°C for 1 hour, then washed 3 times with water, and centrifuged the dehydrated wheat bran residue. Put the wheat bran residue into the acid hydrolysis tank with agitator, add sulfuric acid aqueous solution with a concentration of 4mol / L equivalent to 50 times of the wheat bran residue, stir evenly, and stir at 90°C at 300 rpm React for 100 minutes. After the hydrolysis, add 2% sodium hydroxide aqueous solution to neutralize the reaction solution ...

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Abstract

The invention relates to the field of processing of agricultural products, in particular to short fiber food waste residue-based nano cellulose and a preparation method thereof. The preparation method comprises three parts of pretreatment of short fiber food waste residues, acid hydrolysis of food residue fibers and homogenization. The nano cellulose prepared by the method has the granularity of 50-300nm, is short bar-shaped or microsphere-shaped and can be widely used for preparing a food additive or medicament excipient, and the like. In the method, acid hydrolysis is combined with high-pressure homogenization, thus the acid consumption and hydrolysis time are reduced, the granularity uniformity of the nano cellulose is improved; and the invention is suitable for mass production.

Description

technical field [0001] The invention relates to the field of food processing, in particular to nanocellulose based on short fiber food waste residue and a preparation method thereof. Background technique [0002] Cellulose is a natural polymer compound. Natural cellulose can be processed by ultrafine grinding, acid-base treatment, and enzymatic hydrolysis to obtain a series of micronized fibers such as microcrystalline cellulose and nanofibers. Compared with powdered cellulose and microcrystalline cellulose, nanocellulose has many excellent properties, such as high purity, high degree of polymerization, high crystallinity, high hydrophilicity, high Young's modulus, high strength, and ultrafine structure. and high transparency etc. Therefore, nanocellulose can be used in food additives (forming agent, thickener, dispersant, antisolvent), pharmaceutical excipients, and can also be used to prepare anti-counterfeiting labels and advanced color-changing inks; it can also be pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/04D21C1/02D21C9/02
Inventor 刘雄阚建全刘玲玲陆红佳
Owner SOUTHWEST UNIV
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