A high taxol yield cell line of Taxus yunnanensis Cheng et L. K. Fu keeps a high taxol-producing level after successive subcultures for more than eight years. In this study, eight taxanes were isolated from the suspension cell cultures of this cell line. Based on NMR and MS analyses, and comparison with literature data and standards, their structures were determined to be 2alpha, 5alpha, 10beta-triacetoxy-14beta-proplonyloxy-4(20), 11-taxadiene (1), 2alpha, 5alpha, 10beta-triacetoxy-14beta-(2'-methyl)-butyryloxy-4(20), 11-taxadiene (2), 2alpha, 5alpha, 10beta-14beta-tetra-acetoxy-4 (20), 11-taxadiene (3, taxuyunnanine C), 2alpha, 5alpha, 10beta-triacetoxy-14beta-(2'-methyl-3'-hydroxy)-butyryloxy-4(20), 11-taxadiene (4, yunnanxane) and its 3'-epimer (5), baccatin IV (6), baccatin III (7) and taxol (8), respectively. Among those compounds, 3, 5, 6 and 7 were reported to be isolated from the suspension cell cultures of T. yunnanensis for the first time. TLC and HPLC analyses indicated that the chemical constituents of the culture solution were similar to those of cultured cells. Moreover, the highest taxol content of this cell line reached 0.3% and the cell line could be applied for a large-scale culture.
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