Abstract Biotransformation products of digitoxigenin by cell suspension cultures of Strophanthus gratus were isolated and their structures established as 17βH-digitoxigenin, 3- epi -17βH-digitoxigenin, 17βH-acovenosigenin-A, 17βH-periplogenin, 3- epi -17βH-periplogenin and 3- epi -4β-hydroxy-17βH-digitoxigenin, respectively. Furthermore, periplogenin was identified by TLC and HPLC. Biotransformations involving
Hybrid cells between Strophanthus gratus and S. amboensis were obtained by electrofusion and confirmed to be hybrids through isozyme and RFLP analyses. Because a new and hybrid compound, 17 beta H-periplogenin beta-D-glucoside, was isolated as a biotransformation product of digitoxigenin by the hybrid cells, isomerization of 17 beta-lactone ring on S. gratus and glucosylation on S. amboensis were demonstrated
通过电融合获得 Strophanthus gratus 和 S. amboensis 之间的杂种细胞,并通过同工酶和 RFLP 分析证实是杂种。由于杂种细胞分离出一种新的杂合化合物 17 β H-periplogenin β-D-葡萄糖苷作为洋地黄毒苷的生物转化产物,因此证明了 S. gratus 上 17 β-内酯环的异构化和 S. amboensis 上的糖基化同时作为杂交细胞中的生物转化能力。此外,通过提高蔗糖浓度提高了杂化化合物的生产率。
Biotransformation of digitoxigenin by cell suspension cultures of Strophanthus gratus