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Microbial transformation of papaveraldine
1Medicinal, Aromatic and Poisonous Plants Research Center, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia. abdelaty@ksu.edu.sa
Phytochemistry
|April 4, 2000
Summary
Microbial fermentation of papaveraldine using Mucor ramannianus produced S-papaverinol and its N-oxide. This study elucidates their structures and confirms stereoselective reduction, aligning with prior plant cell studies.
Area of Science:
- Biotechnology
- Organic Chemistry
- Microbiology
Background:
- Papaveraldine is a known benzylisoquinoline alkaloid.
- Previous studies explored papaverine and isopapaverine metabolism in plant cells.
Purpose of the Study:
- Investigate the microbial metabolism of papaveraldine.
- Isolate and elucidate the structures of resulting metabolites.
- Determine the stereochemistry of the reduced product.
Main Methods:
- Preparative-scale fermentation using Mucor ramannianus.
- 1D and 2D Nuclear Magnetic Resonance (NMR) analyses for structure elucidation.
- Horeau's method of asymmetric esterification for absolute configuration determination.
Main Results:
- Stereoselective reduction of papaveraldine's ketone group.
- Isolation of S-papaverinol and S-papaverinol N-oxide.
- Confirmation of metabolite structures and absolute configuration of S-papaverinol.
Conclusions:
- Mucor ramannianus mediates stereoselective reduction of papaveraldine.
- Metabolism findings are consistent with plant cell transformation studies.
- Provides insights into benzylisoquinoline alkaloid biotransformation.