云杉鞣质级分的分子量测定及鞣革性能的研究

Mn AND TANNING POWER OF TANNIN FRACTIONS FROM BARK OF PICEALIKIANGENSIS PRITZ

云杉树皮(P.Likangensis Pritz)粉碎后,经丙酮水浸提去脂,依次用乙醚、乙酸乙酯萃取,得到乙醚级分,乙酸乙酯级分和水级分。对各级分进行试验:1.采用蒸气压渗透法,测定各级分的数均分子量Mn;2.鞣革试验。结果表明: 1.乙醚级分的Mn=350,主要由鞣性小的小分子非鞣质组成;乙酸乙酯级分的Mn=860,具有显著的鞣性;水级分的Mn=1550,主要由属于大分子的鞣质组成。 2.各级分与皮蛋白质结合的顺序依次为:水级分、乙酸乙酯级分、乙醚级分。而渗透性顺序依次为:乙醚级分、乙酸乙酯级分、水级分。 3.云杉栲胶鞣性差的原因,除了树皮单宁含量低(8.91％)外,其中脂类物质(二氯甲烷萃取物)含量高(2.44％),也是其渗透极慢的原因之一。本文对云杉鞣料的开发利用提供了一些理论数据。

Three tannin fract ions, including the ether extract (1), ethyl acetate extract (2) and water extract (3) from the acetone-soluble materials of piceaLikiang ensis Pritz Bank were used for determination of number average molecular weight (Mn) and tanning skin. Results of analysis show that the Mn of (1), (2) and (3) is 350, 860 and 1550 respectively, and that the order of penetration rate is (1)>(2)>(3), and that the order of shringkage temperature is (3)>(2)>(1). The results obtained from tanning power agree with Mn of (1),(2) and (3).