Title: Effect of Different Process Conditions on Microbes and Enzyme Activities during the Pile-fermentation of Pu-erh Tea
Abstract: Effect of different process conditions on microbes(mould) and enzyme activities(polyphenol oxidase,cellulase and pectinase) during the pile-fermentation of Pu-erh tea was studied by orthogonal experiment in laboratory-scale.During pile-fermentation process,mould was growth in large number at the beginning then remained stable.Polyphenol oxidase exhibited 3 kinds of trends which were increase-less-increased,decreased after increasing and increase-less-increase-less.Cellulase and pectinase exhibited similar change trend that was decreased after increasing with various peak value and appearance time.In addition,mould and enzyme activities were remained at a high level by initial moisture content controlled in the range of 40% to 45%.There was no effect on mould and enzyme activities by pH modification.Mould was remained at a high level by turning intervals in 8 days and enzyme activities were remained at a high level by turning intervals in 6 days.Based on the contents of theabrownin,tea polyphenol and catechins,it indicated that Puerh tea would be excessive oxidation under high level initial moisture content(50%) and too high or too low turning interval frequency(4 d,8 d).Therefore,proper process will benefit the quality improvement of Pu-erh tea.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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