通过对黑荆树皮单宁进行醇沉纯化和溶剂萃取分级 ,可得到分子量分布范围不同的单宁级分。各级分对 5种水解酶均表现出不同程度的抑制作用 ,具有一定的选择性。其抑制能力与抑制剂常数Ki 值有关 ,分子量大的单宁级分 ,Ki 值小 ,对酶活性的抑制作用大 ,同时 ,证明了黑荆树皮单宁对纤维素酶的抑制作用属于非竞争性抑制 Tannin bark tannins by alcohol precipitation purification and solvent extraction grading, you can get a range of molecular weight distribution of tannin fractions. All fractions showed different degrees of inhibition on the five kinds of hydrolases, with a certain degree of selectivity. The inhibitory ability was related to the Ki value of the inhibitor constant. The tannin fraction with large molecular weight had small Ki value and had a great inhibitory effect on the enzyme activity. At the same time, it was proved that the inhibitory effect of tannin on the cellulase was non- Competitive inhibition