Ethyl acetate, n-butanol and n-hexane were used as solvents to separate catechins from green tea extract solution and the catechins were decaffeinated using citric acid solution. Ethyl acetate was confirmed to be an appropriate solvent for isolating catechins from tea extract, based on the yield of catechins and the concentration of caffeine. The optimum extraction conditions were that 100 g tea was extracted in 3 L water at 80℃for 40 min and the catechins in the extracted solution were isolated using 1.5 L...
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