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林产化学与工业 ›› 2007, Vol. 27 ›› Issue (6): 22-26.

• 研究报告 • 上一篇    下一篇

桦木醇提取及纯化工艺的研究

王石发, 张明光, 李艳苹   

  1. 南京林业大学 化学工程学院, 江苏 南京 210037
  • 收稿日期:2007-07-02 修回日期:1900-01-01 出版日期:2007-12-30 发布日期:2007-12-30

Study on Extraction and Purification of Betulin from Birch Bark

WANG Shi-fa, ZHANG Ming-guang, LI Yan-ping   

  1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2007-07-02 Revised:1900-01-01 Online:2007-12-30 Published:2007-12-30

摘要: 以白桦树皮为原料,研究了桦木醇提取和纯化的工艺,确定了适宜的提取工艺条件:树皮原料30g,树皮颗粒大小为0.42~1.16mm,采用氯仿为溶剂,用索氏抽提器抽提7h,得到粗桦木醇黄色固体,得率为38.5%.通过重结晶对桦木醇进行纯化,确定了适宜的重结晶条件:以异丙醇为重结晶用溶剂,粗提物与异丙醇的比为1:20(g:mL),结晶温度-5℃,结晶时间1h,在此条件下桦木醇的结晶得率41.4%,产品熔点为245~254℃,纯度为95.4%.

关键词: 白桦树皮, 桦木醇, 提取, 重结晶

Abstract: The technological conditions for extraction and purification of betulin from the outer bark of white birch were investigated. The suitable extraction conditions were determined as follows: amount of bark 30 g, the size of bark particle 0.42-1.16 mm, chloroform was used as extraction solvent, extraction time 7 h. The yield of light-yellow crude extract obtained under aforesaid conditions reached 38.5%. Betulin with high purity was obtained by recrystallization, and the suitable recrystallization conditions were determined as follows: isopropanol was a suitable solvent for recrystallization of betulin, and the ratio of crude extract/isopropanol was 1:20(g:mL); crystallization temperature -5℃, crystallization time 1 h. The yield of betulin was 41.4%, melting point was 245-254℃, and purity was 95.4%.

Key words: white birch bark, betulin, extraction, recrystallization

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