Six new monacolin analogs from red yeast rice

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Pharmacology

Background:

• Red yeast rice is a traditional fermented product known for its health benefits.
• Monacolins are a class of compounds found in red yeast rice with various biological activities.
• Understanding the diversity and properties of monacolins is crucial for developing new therapeutic agents.

Purpose of the Study:

• To isolate and characterize novel monacolin analogs from red yeast rice.
• To determine the structures and absolute configurations of these compounds.
• To evaluate the anti-inflammatory and antioxidant activities of the isolated monacolins.

Main Methods:

• Extraction of compounds from red yeast rice using ethyl acetate.
• Structure elucidation using advanced spectroscopic techniques, including 2D NMR (1H-1HCOSY, HSQC, HMBC, NOESY/ROESY) and CD spectroscopy.
• Chemical derivation for absolute configuration determination.
• In vitro assays to assess anti-inflammatory activity (LPS-induced NO production in BV-2 cells) and antioxidant activity (rat liver microsomal lipid peroxidation).

Main Results:

• Isolation of six novel monacolin analogs (monacolins V1-V6) and seven known ones.
• Determination of the structures and absolute configurations of all isolated compounds.
• Identification of monacolins V2 and V3 as the first examples of monacolins with a 3-hydroxybutyrate substituent.
• Demonstration of anti-inflammatory and antioxidant activities for the evaluated compounds.

Conclusions:

• The study successfully identified novel monacolin analogs from red yeast rice, expanding the known chemical diversity of these compounds.
• The novel monacolins V2 and V3 possess unique structural features.
• The isolated monacolins exhibit promising anti-inflammatory and antioxidant activities, suggesting potential therapeutic applications.