Recovery of Tea Polyphenols from Green Tea Waste by Liquid-Liquid Extraction

Zhong Jian Li; Zhe Wei; Wei Xiao; Jun Wang; Fu An Wu

doi:10.4028/www.scientific.net/AMR.396-398.1592

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Research on the Determination Method of Enzymatic Activity for β-Glucan Synthase (ΒGS)
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Study on Antioxidant Activity of Aqueous Extracts from Scum of Mixed Juice
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Recovery of Tea Polyphenols from Green Tea Waste by Liquid-Liquid Extraction
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 396-398Recovery of Tea Polyphenols from Green Tea Waste...

Recovery of Tea Polyphenols from Green Tea Waste by Liquid-Liquid Extraction

Abstract:

Tea (Camellia sinensis L.) has became one of the most consumed beverages in the world in the past five thousand years, and tea polyphenols (TPs) are important organic acids widely used in chemical, pharmaceutical, food and other industries, which have been shown to exhibit various biological and pharmacological properties. In order to look for new technology of downstream process for TPs separation from green tea waste, selective extraction of TPs with 12 varieties of solvents were carried out, the distribution coefficient and equilibrium experiments at various temperatures were described by extraction isotherms model. The results indicated that the optimum solvent conditions were as follow: extractent was glyceryl triacetate, extraction temperature range was 20~30°C, pH value of crude TPs and reextractant were 3.17 and 9, respectively. Equilibrium data of TPs were successfully fitted to Henry isotherm, the distribution coefficient decreases with the increasing of the temperature, which showing an exothermic adsorption process. The data obtained is useful in the designing of solvent extraction process for the recovery of TPs from green tea waste.