橡子单宁的提取优化及其在皮革中的应用

Optimization of Tannin Isolation from Acorn and Application in Leather Processing

优化了从橡子中提取单宁的最佳工艺参数，并考察其鞣制性能。研究了溶剂／原料比（20～100mL／g）、时间（2～10h）和混合溶剂比（甲醇一水）（0～100％）对提取率、单宁含量和单宁总量的影响。将最佳优化条件下提取出的橡杭单宁应用于皮革鞣制中，并测定鞣革的填充系数（％）和收缩温度（Ts）。优化的提取参数如下：溶剂／原料比为100mL／g，提取时间为6h，混合溶剂比为62％甲醇-38％水。采用提取出的单宁鞣后成革的填充系数为57．81％，收缩温度为75．5℃，远好于市售橡杭单宁鞣革（52．83％，73℃），凸显出优化过程的重要性。表明使用提取出的橡杭单宁作为植物鞣剂应用于皮革工业中，鞣制效果令人满意。

The extraction parameters of tannins from the acorns and the tanning properties were optimized. The effect of sol- vent/feed ratio （20 - 100mL/g） ,time （2 - 10h） and solvent mixture ratio （methanol -water） （0 - 100% ） on extraction yields, tannin contents and total tannin amounts were evaluated. Valonea tannin obtained under optimum conditions was applied to leather tanning process where filling coefficient （ % ） and shrinkage temperature （Ts） of the leathers were examined. Optimum extraction parameters are elicited as 100mL/g for solvent/feed ratio,6h of process duration and solvent mixture ratio of 62% methanol -38% water. The filling coefficient of the leathers tanned with extracted valonea （57.81%） and the shrinkage temperature （75.5℃） is superior to the commercial valonea （52.83% ,73℃ ） implying the significant impact of process optimization. The tanning proper- ties of the extracted valonea are satisfactory for the vegetable tanning in leather industry.