胶体滴定法测定橡椀栲胶中的单宁含量  

Determination of Tannin Content of Valonea Tannin Extracts by Colloidal Titration

作　　者：戴丽君[1] 苏小宝[1] 卢玉栋[1] 陈少平[1] 吴宗华[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《生物质化学工程》2006年第5期15-17,共3页Biomass Chemical Engineering

摘　　要：用胶体滴定法测定了橡椀栲胶中的单宁含量：实验结果表明，pH值为5，橡椀栲胶中单宁质量在0．6—3．0mg范围内，栲胶的电荷量（以滴定值表示）与单宁质量呈良好的线性关系、样品XK-2和XK-3的平均回收率分别为101．1％、103．4%，RSD分别为5．4％和1．5％，皮粉法和胶体滴定法测定的单宁含量的差值小于2．1％。与皮粉法相比，胶体滴定具有快速、简便、样品用量少的特点.Method of eollidal titration was adopted to determine tannin content of valonea tannin extract. Tannin contents is correlated linearlv with charge densities of the extract （expressed as titration value） in the mass range of tannin from 0.6 mg to 3.0 mg at pH 5. Average recoveries of samples XK-2 and XK-3 are 101.1% and 103.4 % respectively, and relative standard deviations are 5.4 % and 1.5 % respectively. Compared with hide powder method, colloidal titration has the advantages of rapidity, simplicity, and low sample consumption.

关 键 词：胶体滴定法 橡椀栲胶 单宁含量 

分 类 号：TQ94[化学工程]