Preparation method of instant tea

Abstract

The invention discloses a preparation method of instant tea. The preparation method comprises the following steps: taking tea leaves, adding water and extracting, carrying out solid-liquid separation to obtain a liquid part, and concentrating the liquid part; adding alkali into the concentrate, adjusting pH value to 8.0-11.5, standing, carrying out solid-liquid separation and taking a liquid part; introducing oxygen into the liquid part to carry out an oxidation reaction; adding acid into an oxidation reaction liquid, adjusting pH value to 5.0-9.5, standing, carrying out solid-liquid separation, taking a liquid part, and drying. The raw material can be green tea, oolong tea or black tea. The raw material has rich sources and is easily available. By adding alkali for alkalization, adjusting pH value and introducing oxygen for oxidation, generation of macromolecular substances in the instant tea can be effectively minimized, turbidity and precipitation are prevented, and clarity of the tea extract and cold solubility of the instant black tea are improved. The prepared instant tea can be completely dissolved in water of more than 5 DEG C, is clear, transparent and bright and has more excellent mouthfeel. The preparation method provided by the invention has a simple technology, is easy to operate and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of tea, in particular to a preparation method of fast brewing tea. Background technique [0002] Instant tea is generally made by extracting tea leaves with water, filtered or centrifuged, concentrated and dried. It is a solid powder that can quickly dissolve in water, has no tea residue and maintains the unique flavor of tea. It is ready to drink and can also be used as a food and beverage preparation Raw materials. Using conventional processing methods, what kind of tea raw materials are generally used to process what kind of instant tea, and the clarity of the product is relatively poor after being dissolved in water. In the prior art, Chinese patent ZL01118460.4 discloses a cold-water-soluble acid-resistant instant black tea powder and a manufacturing method thereof. Black tea leaves are soaked at 80-90° C., and the obtained tea extract is immediately cooled to room temperature. After coarse filtratio...

AI Technical Summary

Problems solved by technology

This method can only use black tea leaves to process instant black tea. Although it can be dissolved in cold water, it is not clear enough

Chinese patent ZL01118449.3 discloses a processing method of instant black tea powder, extracting new tea with hot water and cooling to normal temperature, then adding pectinase, protease and amylase to enzymatically clarify the extract, and then ultrafiltration, Concentrate and spray dry to obtain an instant black tea powder that is basically not cloudy after cold. This method can only use black tea to process instant black tea. It is first extracted with high temperature water, then cooled and then enzymatically muddy, but did not solve the problem of low clarity of its dissolution in water; Chinese patent ZL01118460.4 discloses a manufacturing method of instant black tea powder, black tea leaves are soaked and extracted at 80-90°C, filtered, concentrated, Then use alkali to dissolve, acid to adjust the pH value, and spray dry after centrifugation.

[0003] Only black tea can be used to process instant black tea, without considering the clarity after dissolution