-oic acid ( 5 ), 3-α-hydroxyartemisinic acid ( 6 ) and 3-β-hydroxyartemisinic acid ( 7 ), were isolated by chromatograph methods and identified by the analysis of 1 H NMR, 13 C NMR, and ESI-MS spectra. Compounds 3–5 were obtained for the first time by biotransformation process. It was also the first time to transform artemisinic acid to yield epimeric 3-hydroxy artemisinic acids in plantcell culture
摘要 以长春花和西洋参的细胞悬浮培养物为两种生物催化剂体系,研究了双氢青蒿酸(1)和青蒿酸(2)转化为羟基化衍生物的新型生物转化过程。五种生物转化产物,3-α-羟基二氢青蒿酸(3)、3-β-羟基二氢青蒿酸(4)、15-羟基-cadin-4-en-12-油酸(5)、3-α-羟基青蒿酸(6) ) 和 3-β-羟基青蒿酸 ( 7 ),通过色谱法分离,并通过 1 H NMR、 13 C NMR 和 ESI-MS 光谱分析进行鉴定。化合物3-5是首次通过生物转化过程获得。这也是第一次在植物细胞培养系统中将青蒿酸转化为差向异构的3-羟基青蒿酸。C.生物催化剂体系 Roseus 细胞培养物在外源底物的烯丙基中显示出强大的区域和立体选择性羟基化能力。结果还表明,西洋参冠瘿的生物催化剂体系具有以区域和底物选择性方式羟基化外源底物丙烯基的能力。此外,通过MTT测定评估羟基产物的体外抗肿瘤活性。结果表明α-羟基
Three sesquiterpene compounds biosynthesised from artemisinic acid using suspension-cultured cells of <i>Averrhoa carambola</i> (<i>Oxalidaceae</i>)
A new sesquiterpene glycoside, artemisinic acid 3-beta-O-beta-D-glucopyranoside (3, 31.24%) and other two biotransformation products, 3-beta-hydroxyartemisinic acid (2, 36.69%) and 3-beta-hydroxyartemisinic acid beta-D-glucopyranosyl ester (4, 7.03%), were biosynthesised after artemisinic acid (1) was administered to the cultured cells of Averrhoa carambola. The three biotransformation products were obtained for the first time by using the suspension-cultured cells of A. carambola as a new biocatalyst system, and their structures were identified on the basis of the physico-chemical properties, NMR and mass spectral analyses. The results indicate that the cultured cells of A. carambola have the abilities to hydroxylate and glycosylate sesquiterpene compounds in a regio- and stereoselective manner. Furthermore, the anti-tumour activity of compounds 3 and 4 was evaluated against K562 and HeLa cell lines. Compound 4 showed strong activity against HeLa cell line, with the IC50 value of 0.56 mu molmL(-1).