Continuous phase change-based method for extracting tea polyphenol
A technology for extracting tea polyphenols, which is applied in the field of continuous phase change extraction of tea polyphenols, can solve problems such as the reduction of tea polyphenols extraction rate, and achieve the effects of increased extraction rate, high extraction efficiency, completeness and repeatability
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Embodiment 1
[0028] A method for continuous phase change extraction of tea polyphenols of the present invention comprises the following steps:
[0029] 1. Raw material treatment: Dry the tea leaves at 60°C, control the moisture content to about 4%, and crush them to 20-30 mesh to obtain tea powder raw materials.
[0030] 2. Put 2kg of the above-mentioned tea powder into the extraction kettle. Under the conditions of extraction temperature 50°C and extraction pressure 0.6Mpa, use 85% ethanol solution to extract for 80min at a flow rate of 120L / h. After extracting tea polyphenols, flow into the analysis kettle. The analysis temperature was 70°C and the analysis pressure was 0.12Mpa to obtain 0.99L of tea polyphenol alcohol solution, which was concentrated to no alcohol to obtain an aqueous solution. The yield of tea polyphenols was 23.6%, of which the EGCG content was 41.1%.
Embodiment 2
[0032] A method for continuous phase change extraction of tea polyphenols of the present invention comprises the following steps:
[0033] 1. Raw material processing: Dry the tea leaves at 60°C, control the moisture content to about 5%, and crush them to 40-50 mesh to obtain tea powder raw materials.
[0034] 2. Put 10kg of the above-mentioned tea powder into the extraction kettle. Under the conditions of extraction temperature 60°C and extraction pressure 0.8Mpa, use 80% ethanol solution to extract for 70min at a flow rate of 150L / h. After extracting tea polyphenols, flow into the analysis kettle. The analysis temperature was 70°C, and the analysis pressure was 0.15Mpa to obtain 4.35L of tea polyphenol alcohol solution, which was concentrated to no alcohol to obtain an aqueous solution. The yield of tea polyphenols was 25.5%, of which the EGCG content was 45.6%.
Embodiment 3
[0036] A method for continuous phase change extraction of tea polyphenols of the present invention comprises the following steps:
[0037] 1. Raw material processing: Dry the tea leaves at 60°C, control the moisture content to about 5%, and crush them to 60-80 mesh to obtain tea powder raw materials.
[0038] 2. Put 15kg of the above-mentioned tea powder into the extraction kettle. Under the conditions of extraction temperature 70°C and extraction pressure 1.2Mpa, use 75% ethanol solution to extract for 60min at a flow rate of 150L / h. After extracting tea polyphenols, flow into the analysis kettle. The analysis temperature was 75°C and the analysis pressure was 0.2Mpa to obtain 7.02L of tea polyphenol alcohol solution, which was concentrated to no alcohol to obtain an aqueous solution. The yield of tea polyphenols was 31.2%, of which the EGCG content was 43.4%.
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