摘要
本文选用茯砖茶为原料,通过超声波辅助水浴浸提法得到茶多酚提取液,所得提取液分别用离子沉淀法和大孔树脂吸附法纯化﹒离子沉淀法纯化茶多酚的最佳条件:AlCl_3为沉淀剂,m_(沉淀剂)︰m_(茶多酚)=1︰0.04,NaHCO_3为pH调节剂,调pH=6.0,0.5mol/L盐酸溶解沉淀,茶多酚粗得率为89.99%﹒大孔树脂吸附法纯化茶多酚的最佳条件:吸附时间为40 min,m_(大孔树脂)︰m_(茶多酚)=5︰3,洗脱时间为40 min,茶多酚粗得率为30.98%﹒
In this paper the tea polyphenols were extracted from Fuzhuan tea by ultrasonic-assisted water bath extraction. The extracted liquid was purified by ion precipitation and macroporous resin adsorptionrespectively. The optimum condition for purification of the tea polyphenols by ion precipitation method wasthat the precipitant is AlCl_3, the mass ratio of precipitant to tea polyphenols is 1︰0.04, the pH regulator isNaHCO_3, the optimum pH of the environment is 6, the concentration of the dissolved hydrochloric acid is 0.5mol/L, and the yield of the extracted tea polyphenols is 89.99%. The best condition for the purification of teapolyphenols by macroporous resin adsorption method was that the adsorption time is 40 min, the mass ratio of macroporous resin to tea polyphenols is 5︰3, the elution of 40 min, the yield of tea polyphenols is 30.98%.
引文
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