New derivatives of the iridoid specioside from fungal biotransformation
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY(2021)
摘要
Iridoids are widely found from species of Bignoniaceae family and exhibit several biological activities, such as anti-inflammatory, antimicrobial, antioxidant, and antitumor. Specioside is an iridoid found from Tabebuia species, mainly in Tabebuia aurea . Thus, here fungus-mediated biotransformation of the iridoid specioside was investigated by seven fungi. The fungus-mediated biotransformation reactions resulted in a total of nineteen different analogs by fungus Aspergillus niger , Aspergillus flavus , Aspergillus japonicus , Aspergillus terreus , Aspergillus niveus , Penicillium crustosum , and Thermoascus aurantiacus . Non-glycosylated specioside was the main metabolite observed. The other analogs were yielded from ester hydrolysis, hydroxylation, methylation, and hydrogenation reactions. The non-glycosylated specioside and coumaric acid were yielded by all fungi-mediated biotransformation. Thus, fungus applied in this study showed the ability to perform hydroxylation and glycosidic, as well as ester hydrolysis reactions from glycosylated iridoid. Key points • The biotransformation of specioside by seven fungi yielded nineteen analogs. • The non-glycosylated specioside was the main analog obtained. • Ester hydrolysis, hydroxylation, methylation, and hydrogenation reactions were observe
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关键词
Non-glycosylated specioside, Aspergillus niger, Ester hydrolysis, Methylation, Hydroxylation
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