Extractives of cork (Quercus suber L.):: chemical composition of dichloromethane and supercritical CO2 extracts
Extractives of cork (Quercus suber L.):: chemical composition of dichloromethane and supercritical CO2 extracts
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DOI：
10.1016/j.indcrop.2003.12.007
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发表时间：
2005-01-01
影响因子：
5.9
通讯作者：
Casanova, J
中科院分区：
文献类型：
--
作者：
Castola, V;Marongiu, B;Casanova, J
软木的聚合物基质主要由松脂、木质素和多糖组成，还含有抽出物。萃取物的典型成分是三萜类化合物，它们分别属于紫苏烷、羽扇豆烷和甾体族，以及长链烷烃和烷醇。采用了两种提取方法。传统的溶剂萃取(SE)使用二氯甲烷(DCM)，而创新的方法是在中压(200-250bar)下使用超临界二氧化碳(SFE)作为溶剂。通过计算机辅助的~(13)C核磁共振分析，在没有预先分离的情况下，对提取物中的各个三萜类和甾体类化合物进行了鉴定和定量。挥发油中的主要成分为佛手灵。两种提取物之间的主要区别在于Sitost-4-en-3-one的含量，它占二氧化碳提取物的15%，而DCM提取物的含量为3%。同样，在二氧化碳提取物(3%)中发现了β-谷甾醇，而在DCM提取物中没有。(C)2004爱思唯尔B.V.保留所有权利。
The polymeric matrix of the cork is mainly composed of suberin, lignin and polysaccharides and contains also extractives. Typical components of the extracted mixtures are triterpenes belonging to friedelane, lupane and steroid families and long chain alkanes and alkanols. Two extractive methods have been used. the conventional extraction with a solvent (SE) using dichloromethane (DCM) and the innovative method which uses as solvent supercritical CO2 (SFE) at moderate pressures (200-250 bar). Identification and quantitation of the individual triterpenoids and steroids present in the extracts have been carried out by means of the computer aided C-13 NMR analysis without previous separation. Friedelin was found as the main component of the extracts. The main difference between the two extracts concerned the contents of sitost-4-en-3-one which represented 15% of the CO2 extract against 3% in the DCM extract. Similarly, beta-sitosterol was found in CO2 extract (3%) but not in DCM extract. (C) 2004 Elsevier B.V. All rights reserved.