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Preparation process of decaffeinated tea rich in gamma-aminobutyric acid, concentrated tea juice and instant tea powder

An aminobutyric acid and decaffeination technology, which is applied in the directions of tea, tea treatment before extraction, and tea alkali content reduction, etc., can solve the problems of tea flavor research, increase processing procedures, poor cold solubility, etc., and achieve optimization of extraction process and process. Simple process effect

Inactive Publication Date: 2011-06-22
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it is necessary to use an adsorbent, which takes up the space of the tea leaves in the extraction kettle and reduces the output; moreover, the adsorbent needs to be separated from the tea leaves, which increases the processing steps.
Chinese patent CN1726792 also provides a supercritical CO 2 A method of decaffeinating green tea, but the method does not study the flavor of the decaffeinated tea
This traditional method has poor cold solubility and causes the oxidation of tea polyphenols and other nutrients in tea, resulting in the loss of nutrients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: 1 kg of tea tree fresh leaves (1 bud 3-4 leaves) is soaked in 2.5% sodium glutamate for 3 hours, rinsed and drained with clear water, then vacuumed at 0.09Mpa, temperature at 25°C, Under treatment for 8 hours, after microwave cleaning and drying, the content of gamma-aminobutyric acid in the tea leaves reached 3.18mg / g.

[0015] Weigh 88g of tea leaves rich in γ-aminobutyric acid, soak the tea leaves with water to make the water content reach 40%, put them into HA231-50-06 supercritical CO 2 Fluid extraction device, adjust extraction pressure to 25Mpa, extraction temperature to 50°C, add entrainer anhydrous ethanol 0.15mL / g, CO 2 The flow rate is 22L / h, the extraction time is 6h, the separation pressure I is 10MPa, and the temperature is 45°C; the separation pressure II is 6MPa, and the temperature is 40°C. Dry decaffeinated tea leaves that retain the nutritional components of the tea leaves are obtained in the extraction kettle. Repeated twice, the remov...

Embodiment 2

[0016] Embodiment 2: 1 kg of tea tree fresh leaves (1 bud 3-4 leaves) is soaked with 2% sodium glutamate for 2 hours, rinsed and drained with clear water, then vacuumed at 0.09Mpa, temperature at 25° C. Under treatment for 8 hours, after killing and drying, the content of gamma-aminobutyric acid in the tea leaves reached 2.73mg / g.

[0017] Weigh 88g of tea leaves rich in γ-aminobutyric acid, soak the tea leaves with water to make the water content reach 45%, put them into HA231-50-06 supercritical CO 2 Fluid extraction device, adjust extraction pressure to 25Mpa, extraction temperature to 50°C, add entrainer anhydrous ethanol 0.15mL / g, CO 2 The flow rate is 22L / h, the extraction time is 6h, the separation pressure I is 10MPa, and the temperature is 45°C; the separation pressure II is 6MPa, and the temperature is 40°C. Dry decaffeinated tea leaves that retain the nutritional components of the tea leaves are obtained in the extraction kettle. Repeated twice, the removal rate of...

Embodiment 3

[0019] Embodiment 3: 1 kg of tea tree fresh leaves (1 bud 3-4 leaves) is soaked in 2.5% sodium glutamate for 2 h with a concentration, rinsed and drained with clear water, then vacuumed at 0.09 Mpa, temperature 4 ° C, condition Under treatment for 4 hours, after micro-wave killing and drying, the content of γ-aminobutyric acid in the tea leaves reached 2.21mg / g.

[0020] Weigh 68g of tea leaves rich in γ-aminobutyric acid, soak the tea leaves with water to make the water content reach 45%, put them into HA231-50-06 supercritical CO 2 Fluid extraction device, adjust extraction pressure to 25Mpa, extraction temperature to 40°C, add entrainer anhydrous ethanol 0.15mL / g, CO 2The flow rate is 22L / h, the extraction time is 6h, the separation pressure I is 10MPa, and the temperature is 45°C; the separation pressure II is 6MPa, and the temperature is 40°C. Dry decaffeinated tea leaves that retain the nutritional components of the tea leaves are obtained in the extraction kettle. Repe...

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Abstract

The invention discloses a preparation process of decaffeinated tea rich in gamma-aminobutyric acid, concentrated tea juice and instant tea powder, and the preparation process comprises the following steps: firstly soaking fresh tea leaves in sodium glutamate; then de-enzyming and drying to obtain the tea leaves containing 1.5-3.5mg / g of gamma-aminobutyric acid; maintaining the moisture content of the tea leaves at 30-55%; carrying out supercritical extraction twice for 4-6 hours at the pressure of 15-40MPa and at the temperature of 40-60 DEG C by adding 30% of 0.05-0.20mL / g alcohol, wherein the decaffeinating rate is 40-88%, the loss rate of tea polyphenol is 5-16%, and the loss rate of the gamma-aminobutyric acid is 6-18%; digesting the tea leaves twice with water of 50 DEG C, extracting juice and instantly sterilizing; then cooling to 4-10 DEG C, and concentrating to 10-25 Baum to obtain the concentrated tea juice; and drying the concentrated tea juice, thus obtaining the instant tea powder, wherein the yield is 12-23%.

Description

1. Technical field [0001] The invention relates to a processing technology of decaffeinated tea rich in γ-aminobutyric acid, concentrated tea juice and instant tea powder, especially refers to treating fresh tea leaves with anaerobic method to increase the content of γ-aminobutyric acid in tea leaves , with supercritical CO 2 The process of removing caffeine from tea leaves while retaining beneficial components such as gamma-aminobutyric acid and tea polyphenols to the greatest extent, and simultaneously making the tea leaves into concentrated tea juice and instant tea powder belongs to the technical field of food processing. 2. Technical background [0002] As an important inhibitory neurotransmitter in the nervous system of humans and mammals, γ-aminobutyric acid has many health care functions, such as improving memory, improving vision, lowering blood pressure, regulating heart rate, improving liver function, activating kidney function, and lowering cholesterol. The late...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/14A23F3/26A23F3/28A23F3/38
Inventor 毛建卫叶春林杨志祥吴元锋平丽娟黄俊刘士旺葛青
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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