Method for preparing high gamma-aminobutyric acid instant tea

Abstract

The invention discloses a method for preparing high gamma-aminobutyric acid instant tea. The method comprises the following steps: soaking fresh tea leaves into a 0.25% to 2.5% glutamic acid aqueous solution, the weight of which is one to four times that of the fresh tea leaves; performing anaerobic treatment on the tea leaves for 0.5 to 30 hours under the vacuum degree being -0.05mpa to -0.1mpa; taking out the tea leaves and putting the tea leaves into boiling water, the weight of which is one to four times that of the tea leaves, for 10 to 30 seconds; combining the tea leaves with the glutamic acid aqueous solution after being used for soaking the fresh tea leaves; crushing and homogenizing for 1 to 5 minutes; filtering with a filter screen being 200 meshes; performing high-speed centrifugation on a filtrate at 5000rpm to 7000rpm (Revolutions Per Minute); performing reverse osmosis concentration until the concentration is greater than or equal to 100g / L; then performing reduced pressure evaporation concentration until the concentration is greater than or equal to 300g / L; and performing spray drying or freezing drying until the water content is less than or equal to 5%, thereby obtaining the high gamma-aminobutyric acid instant tea in a shape of green powder. The content of gamma-aminobutyric acid in gamma-aminobutyric acid is between 20.5mg / g and 35.5mg / g.

Description

technical field

[0001] The invention relates to a method for preparing instant tea powder, in particular to a method for preparing high-γ-aminobutyric acid instant tea (also known as GABA instant tea). Background technique

[0002] Gamma-aminobutyric acid (GABA) is a non-protein amino acid found in animals, plants and microorganisms. In mammals, γ-aminobutyric acid exists in the brain and spinal cord, and is an inhibitory neurotransmitter in the central nervous system. Sleep, anti-aging, enhance long-term memory, improve liver and kidney functions and other physiological activities, can be used in medicine, food, beverage, cosmetics and other fields. The content of γ-aminobutyric acid in ordinary tea is very low, generally between 0.02 and 0.2mg / g, while γ-aminobutyric acid tea (GABA tea) generally requires its content to reach more than 1.5mg / g.

[0003] GABA in tea is mainly produced by decarboxylation of glutamic acid, which is catalyzed by glutamic acid decarboxylase. ...