Instant decaffeinated green tea powder and preparation method thereof
A technology for decaffeinated and instant green tea, applied in the direction of tea extraction and the reduction of alkali content in tea, can solve the problems of loss of nutrients, poor cold solubility, oxidation of tea polyphenols, etc., and achieves strong applicability, low cost and good taste. Effect
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[0025] Example 1
[0026] (1) Mix the tea leaves with water so that the water content of the tea leaves accounts for 30% of the total weight, and stir evenly.
[0027] (2) placing the material prepared in step (1) in an extraction kettle, feeding supercritical carbon dioxide, maintaining at 50°C, 350bar, and extracting for about 6 hours, and decaffeinating it;
[0028] (3) The carbon dioxide extracted in the step (2) is washed with water and then used for circulation to decaffeinate the tea leaves prepared in the step (2).
[0029] (4) Add water to the tea leaves treated in step (2) for soaking, add 1 ton of water per 100 kg of tea leaves to mix, and adjust the pH value of the mixed solution to 5.
[0030] (5) To the mixed solution in step (4), add 1 kg of mixed enzyme per 1000 kg of mixed solution, and the mixed enzymes are 5% papain, 30% pectinase, 60% cellulase and 5% tannase (mass). percentage).
[0031] (6) Carry out a heat preservation operation on the mixed solution...
Example Embodiment
[0035] Example 2
[0036] (1) Mix tea and stevia with water (95wt% tea and 5wt% stevia) so that the water content of the raw material accounts for about 40% of the total weight, and stir well;
[0037] (2) placing the material prepared in step (1) in an extraction kettle, feeding supercritical carbon dioxide, maintaining at 40° C., 300 bar, and extracting for about 10 hours, and decaffeinating it;
[0038] (3) the carbon dioxide extracted in step (2) is washed with water and then used to recycle the raw material (95wt% tea leaves and 5wt% stevia) prepared in step (2) to decaffeinate;
[0039] (4) Add water to the raw material treated in step (2) for soaking, add 2 t of water per 100 kg of raw material to mix, and adjust the pH value of the mixed solution to be about 7;
[0040] (5) To the mixed solution in step (4), add 2 kg of mixed enzyme per 1000 kg of mixed solution, and the mixed enzyme includes 20% protease, 15% pectinase, 57% cellulase and 8% tannase (mass percentage...
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