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儿茶原料加水浸提,并将滤液浓缩成膏的全过程中,各种因素对浸提效率和得率等的影响如下:原料片块的大小厚薄:车削片(刨花)的得率为8%,砍片为5%;时间:浸提1小时可提出全部含量的53%,2小时为59.2%;温度:98℃较好,提一小时,浸提效率为53.70%;次数:较好为提6次,可提出全部含量的94.54%,得率为21.2%;树龄:树龄越大,得率越大(5龄的得率为5%,20龄的为24.2%);部位:树干的中、下部位含量一致,上部稍低。云南儿茶的儿茶素含量为40%,进口儿茶的为29.3%。
The effect of various factors on the extraction efficiency and yield during the whole process of leaching of tea raw materials and concentrating the filtrate into paste is as follows: The size and thickness of the raw material tablets: The yield of the turning piece (wood shavings) is 8 %, cut piece is 5%; time: 53% of total content can be extracted in one hour of leaching, 59.2% in 2 hours; temperature: 98°C is better, mention one hour, extraction efficiency is 53.70%; times: better For mentioning 6 times, 94.54% of the total content can be proposed, and the yield is 21.2%. Tree Age: The larger the tree age, the greater the yield (5% at 5 instars and 24.2% at 20 instars); The content of the middle and lower parts is the same and the upper part is slightly lower. The content of catechins in Yunnan catechu tea is 40%, and 29.3% in imported catechu tea.