Simple and Rapid Method for Wogonin Preparation and Its Biotransformation

Area of Science:

• Natural Product Chemistry
• Microbial Biotechnology
• Pharmacology

Background:

• Wogonin, a key flavonoid from *Scutellaria baicalensis* (Baikal skullcap), has therapeutic potential but faces availability issues due to low natural content.
• Wogonin and baicalein are considered crucial in traditional Chinese medicine, including for COVID-19 management.
• Baikal skullcap is rich in wogonin glucuronide, a potential precursor for wogonin production.

Purpose of the Study:

• To develop a rapid, cost-effective method for preparing gram quantities of wogonin and baicalein.
• To investigate the microbial biotransformation of wogonin and identify its metabolites.
• To explore the regioselective glycosylation of flavonoids catalyzed by microorganisms.

Main Methods:

• A novel preparation method yielding gram quantities of wogonin and baicalein.
• Screening of 36 microorganisms for wogonin biotransformation efficiency.
• Scaled-up biotransformation studies to identify Phase I and Phase II metabolites.

Main Results:

• Successful preparation of wogonin and baicalein in significant amounts.
• Identification of 4 étaire-hydroxywogonin as the major Phase I metabolite, a rare flavonoid with anticancer properties.
• Formation of wogonin glucosides as major Phase II metabolism products.

Conclusions:

• The developed method enhances the availability of wogonin and baicalein for research and therapeutic applications.
• Microbial biotransformation provides a route to novel flavonoid derivatives like 4 étaire-hydroxywogonin.
• The study contributes to understanding microbial glycosylation patterns in flavonoids.