Method for preparing low-caffeine tea leaves
A technology with low caffeine and caffeine, applied in the direction of reducing the alkali content of tea, can solve the problems of difficult application in domestic small and medium-sized enterprises, loss of aroma of finished tea, expensive extraction equipment, etc., and achieve the effects of wide application range, convenient operation and small investment.
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Embodiment 1
[0022] 1) Preparation of tea polyphenol solution: use tea polyphenols with a caffeine content of less than 0.5% and a purity of greater than 98% to prepare an aqueous solution of tea polyphenols with a mass fraction of 5%.
[0023] 2) Deactivation and decaffeination: Put 1Kg of fresh tea leaves into 8L of the above-mentioned tea polyphenol solution to immerse and deactivate, treatment conditions, temperature 95℃, time 4min. After centrifugation or draining, the tea leaves were taken out. The treated solution was 7.8L. The content of caffeine in the solution was detected to be 1.52mg / ml. Then 0.9Kg of fresh tea leaves were added again. Treatment conditions, temperature 100℃, time 5min, after treatment, the solution The content of caffeine is 3.21mg / ml (the solution can be recycled after caffeine is removed from the lignocellulose or macroporous resin chromatography column).
[0024] 3) Centrifugal dewatering or draining the extracted tea leaves, according to the traditional tea maki...
Embodiment 2
[0029] 1) Preparation of instant tea powder solution: Use instant tea powder with a caffeine content of less than 0.5% to prepare an aqueous solution of instant tea powder with a mass fraction of 15%.
[0030] 2) Decaffeinated: Put 0.5Kg of roasted green dry green tea into 10L of the above instant tea powder solution, treatment conditions, temperature 95℃, time 7min, centrifuge or drain the tea leaves. The filtered solution can be reused. When the content of caffeine is greater than 3.0mg / ml, it can be recycled after the caffeine is removed from the lignocellulose or macroporous resin chromatography column.
[0031] 3) Centrifugal dehydration of the extracted tea leaves and drying at -0.98MPa and 60°C to obtain hypocaffeine tea.
[0032] 4) In order to illustrate the superiority of this method, deionized water was used to replace the low-caffeine instant tea powder solution, and other conditions were the same as the control treatment. The test results are shown in Table 2
[0033] Ta...
Embodiment 3
[0036] 1) Preparation of tea polyphenol solution: use tea polyphenol with a caffeine content of less than 1.0% and a purity of greater than 95% to prepare a tea polyphenol solution with a mass fraction of 15%.
[0037] 2) Put 0.5Kg of roasted green tea into 10L of the above-mentioned instant tea powder solution, and the treatment conditions are: temperature 100°C, time 5min.
[0038] 3) Centrifugal dehydration of the extracted tea leaves and drying at -0.98Mpa at 60°C to obtain hypocaffeine tea.
[0039] 4) The solution can be used again after the tea is processed. When the content of caffeine is greater than 3.0mg / ml, it can be recycled after the caffeine is removed from the lignocellulose or macroporous resin chromatography column.
[0040] 5) The treated solution is 9.5L, 0.45Kg of fried green tea is put into it, and treated at 100°C for 7 minutes.
[0041] 6) Take out the tea leaves for centrifugal dehydration, and dry them at -0.98Mpa at 60°C to obtain hypocaffeine tea 2. The test...
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