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Preparation method of tea leaf water soluble dietary fibers

A dietary fiber and water-soluble technology, which is applied in food processing, food extraction, food science, etc., can solve the problems of strict production conditions, unsuitability for expanding scale production, and inconvenient operation, etc., and achieve low input costs, saving capital investment, The effect of less demanding production conditions

Inactive Publication Date: 2017-09-05
XINYANG AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the research and development of dietary fiber in my country is still in its infancy, and there is less research on the preparation technology of tea dietary fiber, and no large-scale processing enterprises have been formed. Enzyme-chemical methods are commonly used in production to prepare water-soluble dietary fiber, but enzyme-chemical methods When the production conditions are strict, the operation is not convenient enough, and it is not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A method for preparing tea water-soluble dietary fiber, which comprises the following steps:

[0061] A. Hot water extraction after crushing

[0062] Use waste tea leaves as raw materials and pass through a 50-mesh sieve to obtain tea leaves, then mix the tea leaves with water at a temperature of 80°C according to the weight ratio of material to liquid 1:20, and extract at a temperature of 80°C for 25 minutes , to remove tea polyphenols, soluble sugars, and amino acids in the tea leaves, and extract 3 times to obtain the extracted mixture;

[0063] B. Acid hydrolysis after filtration

[0064] Filter the leached solution described in step A, take the tea filter residue, then mix the tea filter residue with an acid solution with a hydrogen ion concentration of 1.7 mol / L according to the volume ratio of material to liquid at 1:30, and heat the mixture at a temperature of 80° C. Under the conditions of acid hydrolysis for 2.0h, the mixture after acid hydrolysis was obtain...

Embodiment 2

[0070] A method for preparing tea water-soluble dietary fiber, which comprises the following steps:

[0071] A. Hot water extraction after crushing

[0072] Use discarded tea leaves (aged green tea) as raw materials to pulverize through a 60-mesh sieve to obtain tea leaves, and then mix the tea leaves with water at a temperature of 70°C according to the weight ratio of material to liquid at 1:15, and mix the tea leaves with water at a temperature of 70°C Extraction under conditions for 20 minutes to remove tea polyphenols, soluble sugars, and amino acids in the tea leaves, and extract twice to obtain the extracted mixture;

[0073] B. Acid hydrolysis after filtration

[0074] The solution after the leaching described in step A is filtered, and the tea leaf filter residue is taken, and then the tea filter residue is mixed with an acid solution (citric acid) with a hydrogen ion concentration of 1.3mol / L according to a material-to-liquid volume ratio of 1:35, and mixed in the A...

Embodiment 3

[0080] A method for preparing tea water-soluble dietary fiber, which comprises the following steps:

[0081] A. Hot water extraction after crushing

[0082] Use waste tea leaves (summer and autumn green tea) as raw materials to crush through a 40-mesh sieve to obtain tea leaves, then mix the tea leaves with water at a temperature of 60°C according to the weight ratio of material to liquid at 1:30, and mix the tea leaves with water at a temperature of 60°C. Underleaching for 30 minutes to remove tea polyphenols, soluble sugars, and amino acids in the tea leaves, and leaching once to obtain the leached mixture;

[0083] B. Acid hydrolysis after filtration

[0084] The solution after the leaching described in step A is filtered, get the tealeaves filter residue, then according to the solid-liquid volume ratio 1:40, the acid solution (preferably hydrochloric acid, citric acid) that the tealeaves filter residue and the hydrogen ion concentration are 0.5mol / L or nitric acid) were ...

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Abstract

The invention relates to a preparation method of tea leaf water soluble dietary fibers. The preparation method comprises the following steps of A, crushing abandoned tea leaves as raw materials, screening the crushed tea leaves, mixing the screened tea leaves with water at the temperature being 60-85 DEG C according to the weight ratio of the screened tea leaves to the water being (1 to 10)-(1 to 30), maintaining the temperature, and performing leaching for 15-30min; B, performing filtration, taking tea leaf filter residues, mixing the tea leaf filter residues with an acid solution of which the hydrogen ion concentration is 0.5-2.0mol / L according to the volume ratio of the tea leaf filter residues to the acid solution being (1 to 20)-(1 to 40), and performing acidolysis at 60-85 DEG C for 1.0-2.5h; C, performing centrifugal filtration, and performing concentration so as to obtain concentrate; and D, mixing the concentrate with ethanol of which the volume concentration is 80%-95% according to the volume ratio of the concentrate to the ethanol being (1 to 3)-(1 to 5), performing standing for 12h or above, performing centrifugal separation, collecting precipitate, and performing freeze-drying so as to obtain the tea leaf water soluble dietary fibers. The preparation method disclosed by the invention is short in production cycle, simple and convenient to operate, not high enough in requirements for production conditions, and low in investment cost, 60% or above of capital investment can be saved, the extraction rate of the water soluble dietary fibers is 55% or above, the purity of the water soluble dietary fibers is 70% or above, and the preparation method is suitable for mass production.

Description

technical field [0001] The invention relates to the field of preparation of water-soluble dietary fiber, in particular to a method for preparing tea water-soluble dietary fiber. Background technique [0002] Dietary fiber refers to the sum of edible plant cells, polysaccharides, lignin and related substances that cannot be digested and absorbed by human endogenous enzymes. As the seventh largest nutrient, dietary fiber not only has high nutritional value, but also prevents many diseases , essential for human metabolism. Dietary fiber is divided into two categories: water-soluble dietary fiber and insoluble dietary fiber. [0003] Water-soluble dietary fiber is composed of galactose, arabinose, galacturonic acid, rhamnose, pentaldehyde sugar, trehalose, glucose and other sugars, and its structure is rhamnogalacturonic acid as the main chain. There are galactan and arabinan combined on the side chain, the molecular weight is between 5kDa and 100kDa, and the structure is simi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L33/21
CPCA23L33/21A23V2002/00A23V2200/30A23V2250/5116A23V2300/14A23V2300/50
Inventor 张洁陈义池水婧刘威尹鹏王子浩刘佳朱建梅郭桂义
Owner XINYANG AGRI & FORESTRY UNIV
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