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A method for preparing high-yield double-electric chitin nanofibers

A nanofiber and chitin technology, which is applied to the chemical characteristics of fibers, chemical instruments and methods, and other chemical processes, can solve the problems of only 38% yield, low efficiency, and long time-consuming for double-electric chitin nanocrystals. Good dispersibility, simple process, and favorable effects for modification

Active Publication Date: 2019-08-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ifuku et al. recently prepared double-electric chitin nanocrystals (Ifuku et al. Carbohydrate Polymers, 2015, 122:1-4.), which can achieve uniform dispersion under both acidic and alkaline conditions, but the prepared Dielectric chitin nanocrystals have the problems of long time-consuming, only 38% yield and low efficiency

Method used

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  • A method for preparing high-yield double-electric chitin nanofibers
  • A method for preparing high-yield double-electric chitin nanofibers
  • A method for preparing high-yield double-electric chitin nanofibers

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Embodiment 1

[0051] First, mix 10 g of chitin powder with 200 ml of 35% sodium hydroxide, stir and heat at 90 degrees Celsius for 1 hour, wash and remove the sodium hydroxide with ethanol, and dry to obtain deacetylated chitin powder. Utilize the titration method to test that the amino group content is 12%; take out 1g of the above-mentioned chitin and put it into a flask, add 0.1mmol of TEMPO reagent, 10mmol of NaClO 2 , 90ml, 0.1mol / l, pH=6.86 phosphate buffer solution, then add 1mmol NaClO solution, seal the flask, react at 60°C for 2h, 300W ultrasonic for 30min, 7000r centrifugation for 15min, the carboxyl content is 9 %, the yield is 80%, and the chitin nanofiber suspension can be stably dispersed for more than two months under acidic and alkaline conditions.

Embodiment 2

[0053] The type of materials used and the technological process are the same as in Example 1, except that the concentration of sodium hydroxide used is 50%, the amino content of the prepared chitin nanofibers is 16%, the carboxyl content is 15%, and the yield is 85%. It can be uniformly and stably dispersed in acidic and alkaline solvents for more than two months.

Embodiment 3

[0055] The kind of material used and technological process are the same as embodiment 1, and the difference is that the time of TEMPO oxidation is 10h, and the amino content of the prepared chitin nanofiber is 12%, and the carboxyl content is 30%, and the productive rate is 93%. It can be uniformly and stably dispersed in alkaline solvents for more than two months.

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Abstract

The invention discloses a method for rapidly preparing high-yield double-electricity chitin nanofiber. The method comprises the steps of firstly utilizing concentrated alkaline for carrying out deacetylation on chitin, endowing the chitin with amidogen, and then utilizing a TEMPO-NaClO2-NaClO system for oxidizing, thus obtaining the chitin nanofiber with amidogen and carboxyl at the same time, so that the prepared chitin nanofiber has double-electricity, not only can be dispersed under an acid condition, but also can be dispersed under an alkaline condition, and is favorable for surface modification and design by rich functional groups on the surface; the preparation yield is higher, and large-scale production is facilitated, so that the application range of the chitin nanofiber is expanded.

Description

technical field [0001] The invention relates to a method for preparing high-yield double-electric chitin nanofibers, which belongs to the field of natural polymers, and also belongs to the fields of chemistry, chemical industry, agriculture and environmental engineering. Background technique [0002] Chitin is a natural polymer with reserves second only to cellulose in nature, and it is also the nitrogen-containing organic compound with the largest reserves on the earth. The molecular chain of chitin contains a large number of acetylamino groups. When it is deacetylated, that is, when the degree of removal of acetyl groups reaches more than 50%, it becomes the main derivative of chitin—chitosan. Because the chitin obtained by deacetylation of chitin has amino groups, it will be ionized and positively charged under acidic conditions, so the deacetylated chitin will have strong antibacterial and antibacterial properties, so it has a wider range of applications . Chitin nanof...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/00C08B37/08C08L5/08B01J20/24B01J20/30
Inventor 段咏欣庞凯张建明刘晓婷
Owner QINGDAO UNIV OF SCI & TECH
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