Microbial metabolism of α-mangostin isolated from Garcinia mangostana L.

► This paper highlights the biotransformation of α-mangostin by endophytic fungi. ► This is the first report on microbial transformation of α-mangostin. ► Four previously unknown xanthone-derivatives were isolated. ► All compounds were evaluated for anti-mycobacterial activity. ► One exhibited highter anti-mycobacterial activity than the substrate.