栲胶中非单宁含量计算公式的改进  

Improvement of the Computational Formula for Non-tannin Content in Vegetable Extracts

作　　者：梁发星 黄仁整 

机构地区：[1]广西武鸣栲胶厂,广西南宁530001

出　　处：《林产化学与工业》2014年第3期13-21,共9页Chemistry and Industry of Forest Products

摘　　要：皮粉法是国际公认的定量分析单宁含量的通用方法。以毛杨梅栲胶为单宁含量分析对象,考察了LY/T 1082-2008标准中皮粉法的非单宁含量值计算标准公式X5=（1.2×20（m3-m4）＋0.075）/（m0（1-X2））×100的使用情况。通过对2000~2011年这12年的生产分析数据,发现皮粉的空白残渣值对皮粉法标准公式计算非单宁含量影响很大。采用参数区间估计法和假设法,皮粉空白残渣修正值以变量值20 m4替代标准中的固定值0.075 g/L,得到了新的栲胶非单宁含量计算公式,即X5=（1.2×20（m3-m4）＋20m4）/（m0（1-X2））×100。新公式中引入皮粉的空白残渣修正值后,皮粉空白残渣值对非单宁含量的影响非常小,皮粉的空白残渣值可允许小于等于0.040 g,是标准允许小于等于0.013 g范围的3倍,计算的毛杨梅栲胶样品的单宁含量值均符合质量指标要求。变量值20 m4也适用于替代分析栲胶原料非单宁含量的标准公式中的0.075 g/L固定值。另外,分析所用高岭土的水溶物这一质量指标对皮粉空白残渣值和栲胶不溶物含量也有较大影响,从而导致毛杨梅栲胶单宁质量分数计算结果比正常值（68%）偏高2~6个百分点,因此期待尽快出台高岭土的相应标准。Hide powder method is the international standard for determining tannin extracts in vegetable tannin, and the computational formula was presented as X5 =（1.2 ×20（m3 -m4） ＋0.075）/（m0（1-X2）） ×100. In this paper, the formula was investigated for its influence on the final results with kaolin as experimental materials. The experiments indicated that the error was significantly influenced by the blank residuals of hide powder, and the fixed factor 0. 075 g/L in the formula could not reduce the error. The quantity of soluble substance in the kaolin still had effect on the test results. Based on the parameter interval estimation method and subjunctive method, the new factor-g/L was obtained and the computational formula was changed to X5 =（1.2 ×20（m3 -m4） ＋20 m4）/（m0（1 -X2）） ×100 for the non-tannins test in vegetable extracts. A series of test results presented the error was greatly reduced due to the correction coefficient for residuals of blank hide powder and soluble substance in kaolin.

关 键 词：皮粉 检测 非单宁 单宁 栲胶 制革 

分 类 号：TQ35[化学工程]