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Method for preparing hydrogel by modifying tea grounds, and applications of hydrogel

A hydrogel and cellulose hydrogel technology, applied in the field of natural polymer modification technology, can solve the problems of wasting potential resources, environmental pollution, etc., and achieve the effects of easy operation, less process equipment, and mild reaction conditions

Inactive Publication Date: 2014-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These tea beverage and instant tea manufacturers produce as much as 160 million kilograms of tea dregs every year. If these discarded tea dregs are treated as garbage, it will not only waste the potential resources contained in them, but also easily cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) One leaf of fresh green tea is steamed, dried, crushed, and sieved to obtain pretreated tea leaves;

[0044] (2) Soak the pretreated tea leaves and water at a mass ratio of 1:25, at a water temperature of 70°C, for 10 minutes each time, extract water-soluble components, filter, and dry. Use petroleum ether as a solvent, soak and stir for 1 hour to degrease, wash with water, decolorize with acetone, wash, and dry to obtain degreasing and decolorized green tea residue.

[0045] (3) Mix the degreased and decolorized green tea residue with 1% NaOH solution at a material-to-liquid ratio of 1:10 (g:mL) evenly, place in a water bath at a constant temperature of 30°C for 1 hour, filter with suction, and wash with water. Then mix it with concentrated sulfuric acid according to the material-to-liquid ratio of 1:10 (g:mL), acidify at a constant temperature of 40°C for 1 hour, filter with suction, wash with water, and dry to obtain a leaf of tea dregs cellulose;

[0046] (4) Usi...

Embodiment 2

[0049] (1) steam green tea two leaves, dry, crush, and sieve to obtain pretreated tea leaves;

[0050] (2) Soak the pretreated tea leaves and water at a mass ratio of 1:25, at a water temperature of 80°C, for 15 minutes each time, extract water-soluble components, filter, and dry. Use petroleum ether as a solvent, soak and stir for 1.5 hours to degrease, wash with water, decolorize with acetone, wash, and dry to obtain degreasing and decolorized green tea residue.

[0051] (3) Mix the degreased and decolorized green tea residue with 2% NaOH solution at a material-to-liquid ratio of 1:15 (g:mL) evenly, bathe in a water bath at a constant temperature of 35°C for 1.5 hours, filter with suction, and wash with water. Then mix it evenly with concentrated sulfuric acid according to the material-to-liquid ratio of 1:15 (g:mL), acidify at a constant temperature of 50°C for 1 hour, filter with suction, wash with water, and dry to obtain the two-leaf tea residue cellulose;

[0052] (4) ...

Embodiment 3

[0055] (1) Steam greening three leaves of fresh green tea, dry, crush, and sieve to obtain pretreated tea leaves;

[0056] (2) Soak the pretreated tea leaves and water at a mass ratio of 1:30 at a water temperature of 90°C for 3 times, each soaking time is 20 minutes, extract water-soluble components, filter, and dry. Use petroleum ether as a solvent, soak and stir for 1.5 hours to degrease, wash with water, decolorize with acetone, wash, and dry to obtain degreasing and decolorized green tea residue.

[0057] (3) Mix the degreased and decolorized green tea residue with 3% NaOH solution at a material-to-liquid ratio of 1:20 (g:mL) evenly, place in a water bath at a constant temperature of 40°C for 1.5 hours, filter with suction, and wash with water. Then mix it evenly with concentrated sulfuric acid according to the material-to-liquid ratio of 1:20 (g:mL), acidify at a constant temperature of 60°C for 1 hour, filter with suction, wash with water, and dry to obtain the three-le...

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Abstract

The invention provides a method for preparing hydrogel by modifying tea grounds, and applications of the hydrogel. The method mainly comprises the preparation steps of: grouping fresh and green tea branches and leaves, fixing, drying and crushing, extracting water-soluble components, filtering and drying, degreasing, decolorizing to obtain green tea grounds for later use; extracting water-insoluble dietary fiber from the green tea grounds by adopting an alkaline chemical method, and pickling to obtain different tendernesses of tea ground cellulose; modifying the tea ground cellulose by using ionic liquid AMIMC1 to prepare different tendernesses of tea ground cellulose hydrogel. The prepared tea ground cellulose hydrogel not only changes tea grounds into valuables, but also can protect the environment; in the preparation process, the best tenderness for performing high-value utilization to the tea grounds can be realized by comparing and discussing the characteristics and applicability of the hydrogel prepared by the different tendernesses of tea ground cellulose. In addition, the applications of the prepared tea ground cellulose hydrogel is primarily discussed, the hydrogel can be used as a medicament release carrier, and provide an entry point for the high-value and deep processing utilization of the tea grounds.

Description

technical field [0001] The invention relates to natural cellulose hydrogel, specifically a preparation method and application of hydrogel with tea residue as the main raw material, which belongs to environmental protection, high-value deep processing and utilization of agricultural products and natural polymer modification technology. Background technique [0002] In the past ten years, my country's tea industry has developed rapidly. In 2009, the planting area of ​​China's tea gardens reached 1.8 million hectares, accounting for about 45% of the world's total, and the tea output was 1.358 million tons, accounting for about 1 / 3 of the world's total. my country's planting area and tea production rank first in the world. At the same time, my country's tea beverage, tea polyphenols, instant tea and other industries have developed rapidly. Among them, tea beverage has become the third largest beverage, second only to water and carbonated beverages. Whether it is tea beverage, i...

Claims

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Application Information

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IPC IPC(8): C08B15/06D21C5/00A61K47/38
Inventor 黄惠华厉剑剑刘丽斌唐展榆刘淑敏
Owner SOUTH CHINA UNIV OF TECH
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