NW A&F Univ;
Coll Sci;
Yangling 712100;
Shaanxi;
Peoples R China;
Natl Engn Res Ctr Phytochem W China;
Yangling 712100;
Shaanxi;
Peoples R China;
(25R)-Spirost-5-ene-3β; 7β; 21-triol; Coriolus versicolor; Diosgenin; Microbial biotransformation; Biocatalysis;