【作者】 龙春梅； 李晶晶； 蒋文伟；

【Author】 Long Chunmei, Ling Jingjing, Jiang Wenwei (College of Chemical Engineering, Sichuan University, Chengdu, 610065)

【机构】 四川大学化学工程学院；

【摘要】 采用络合沉淀法制备茶多酚,其中络合剂为对茶多酚沉淀率最高的Al3+ 。要考察了络合剂的循环利用,并从工业化角度考察了Fe3+ 对茶多酚收率的影响。研究表明:(1) 2 0 0g绿茶以6 5克AlCl3·6H2 O为络合剂,在30～5 0℃、pH值5～6的条件下络合,络合得到的沉淀用水充分洗净后再用10 %盐酸酸化转溶,然后用等体积的乙酸乙酯萃取,乙酸乙酯相浓缩即得茶多酚粗品,收率11 94 % ,含量90 %。(2 )Fe3+ 对产品的收率影响很大。当w(Fe3+ ) /w(Al3+ ) =0 17时,产品收率仅为3 2 6 %。这一研究结果对工业化生产具有一定的指导意义。(3)络合剂循环利用3次后产品收率仍无明显变化,产品收率可维持在10 %以上。更多还原

【Abstract】 Tea polyphenols were prepared by complexing precipitation processs using aluminium salt This study mainly focuses on the recycle of complex agent From the point of view of industrialization, the effect of Fe 3+ content on the product yield was investigated The results show that under the conditions of 30-50 ℃ & pH 5-6, the tea polyphenols in 200 gram green tea can complex with 65 gram hydrous aluminium chloride The precipitate thus obtained is washed with deionized water completely, acidified with 10% hydrochloric acid, and then extracted with ethyl acetate of equivalent volume The TP solution of ethyl acetate is concentrated to produce crude TP with the yield up to 11 94% and purity of 90% The experimental data also show great reduction in TP yield when Fe(Ⅲ) was involved in the precipitation process of aluminium salt In the absence of ferric iron, the aluminium complex agent can be recycled at least 3 times with TP yield more than 10%更多还原