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Method for preparing insoluble tea-leaf dietary fiber

A technology of dietary fiber and tea dregs, which is applied in the field of preparation of insoluble tea dregs dietary fiber, can solve the problems of low content of insoluble dietary fiber, affecting the appearance and taste of baked food, poor color and other problems

Inactive Publication Date: 2012-10-17
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, middle and low-grade tea leaves are crushed and added to baked foods to increase the content of insoluble dietary fiber and improve food quality. However, the appearance and taste of baked foods are affected by the low content of insoluble dietary fiber and poor color.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using green tea dregs as raw materials, the green tea dregs were dried with hot air at 60°C to a moisture content of 5% on a wet basis. Coarsely crush the dried tea residue to 40 mesh.

[0020] Acid treatment: use hydrochloric acid to prepare a solution with a pH value of 1.0, mix according to the ratio of dry weight of tea dregs to hydrochloric acid solution 1:40 w / w, and treat at 90°C with a stirring speed of 60r / min for 1.5h.

[0021] Alkali treatment: the acid-treated tea residue is filtered to obtain a primary filter residue. Use solid sodium hydroxide to prepare a solution with a pH value of 13.5, mix the dry weight of the primary filter residue with the sodium hydroxide solution at a ratio of 1:40 w / w, and process for 3.0 hours at 90°C with a stirring speed of 60r / min.

[0022] Degreasing: The alkali-treated tea dregs are washed with water to neutrality and filtered to obtain a secondary filter residue. According to the ratio of the dry weight of the secondary ...

Embodiment 2

[0026] Using oolong tea dregs as raw materials, the oolong tea dregs were dried with hot air at 65°C to a moisture content of 7% on a wet basis. Coarsely crush the dried tea residue to 40 mesh.

[0027] Acid treatment: use hydrochloric acid to prepare a solution with a pH value of 1.3, mix according to the ratio of dry weight of tea dregs to hydrochloric acid solution 1:35 w / w, and treat at 90°C with a stirring speed of 60r / min for 1.5h.

[0028] Alkali treatment: the acid-treated tea residue is filtered to obtain a primary filter residue. Use solid sodium hydroxide to prepare a solution with a pH value of 13.0, mix the dry weight of the primary filter residue with the sodium hydroxide solution at a ratio of 1:35 w / w, and treat for 3.0 hours at 90°C with a stirring speed of 50r / min.

[0029] Degreasing: The alkali-treated tea dregs are washed with water to neutrality and filtered to obtain a secondary filter residue. Mix according to the ratio of dry weight of secondary filt...

Embodiment 3

[0033] Black tea dregs were used as raw materials, and the black tea dregs were dried with hot air at 70°C to a moisture content of 7% on a wet basis. Coarsely crush the dried tea residue to 30 mesh.

[0034] Acid treatment: Use hydrochloric acid to prepare a solution with a pH value of 1.5, mix the dry weight of tea residue with hydrochloric acid solution at a ratio of 1:30 w / w, and treat for 1.0 h at 80°C with a stirring speed of 50 r / min.

[0035] Alkali treatment: the acid-treated tea residue is filtered to obtain a primary filter residue. Use solid sodium hydroxide to prepare a solution with a pH value of 13.0, mix the dry weight of the primary filter residue with the sodium hydroxide solution at a ratio of 1:30 w / w, and treat it at 80°C with a stirring speed of 50r / min for 2.5h.

[0036] Degreasing: The alkali-treated tea dregs are washed with water to neutrality and filtered to obtain a secondary filter residue. According to the ratio of the dry weight of the secondar...

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PUM

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Abstract

The invention provides a method for preparing an insoluble tea-leaf dietary fiber. The insoluble tea-leaf dietary fiber is prepared from tea leaves serving as raw materials by drying, coarse grinding, acid treating, alkali treating, degreasing, decoloring, drying and crushing. The insoluble tea-leaf dietary fiber has high intermediate product whiteness, high organoleptic quality and high water holding capacity and expansibility. By utilizing the tea leaves to prepare the insoluble dietary fiber with high activity, the method realizes comprehensive utilization of tea processing and remarkably increases economic value added.

Description

technical field [0001] The invention relates to the field of edible dietary fiber, in particular to a preparation method of insoluble tea dregs dietary fiber. Background technique [0002] Dietary fiber is called the seventh nutrient in addition to the six major nutrients, which refers to edible carbohydrates and their analogs that cannot be digested by the human body. These substances cannot be digested and absorbed by the small intestine, but can be fully or partially fermented in the large intestine , including polysaccharides, oligosaccharides, lignin, or plant components associated therewith. According to the different solubility in water, dietary fiber is divided into soluble dietary fiber and insoluble dietary fiber. Insoluble dietary fiber has good water absorption and expansibility, which can promote intestinal peristalsis, prevent constipation and intestinal diseases; increase satiety and prevent obesity; it can also absorb intestinal toxins and promote their excr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L1/28A23L1/308A23L33/22
Inventor 安凤平宋洪波宋江良
Owner FUJIAN AGRI & FORESTRY UNIV
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