CPC A23F 3/14 (2013.01) [A23F 3/18 (2013.01); A23F 3/20 (2013.01); A23F 3/22 (2013.01); A23F 3/32 (2013.01)] | 5 Claims |
1. A method for preparing a functional beverage of dark tea with zero energy for reducing weight and lipid, comprising the following steps:
step (1): treatment of raw materials: pulverizing dark tea, mulberry leaf, lotus leaf, and stevia leaf separately, screening through a 40 mesh sieve, and mixing in determined amounts uniformly to obtain a raw tea mixture;
step (2): circulatory microwave extraction: mixing the raw tea mixture with purified water in determined amounts uniformly, carrying out circulatory extraction for 10-30 min with microwave power of 400-600 W, and filtering an extract through a 100 mesh sieve and a 300 mesh sieve in sequence;
step (3): static settlement: allowing a filtrate to be statically settled for 8-12 h at 2-8° C. and centrifuged at 4° C. to remove flocs;
step (4): membrane ultrafiltration: subjecting a supernatant to ultrafiltration with a 10-100 kDa semi-permeable membrane to further remove impurities, preventing flocculation during beverage sterilization and storage;
step (5): ultra-high temperature instantaneous sterilization (UHT): sterilizing by heating a permeate at 135-150° C. for 2-8 s to obtain a functional beverage of dark tea,
wherein the functional beverage includes following components in parts by weight: 1.5-3.5 parts of dark tea, 0.3-0.7 parts of mulberry leaf, 0.1-0.5 parts of lotus leaf, 0.1-0.3 parts of stevia leaf, and 95.4-97.4 parts of purified water.
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