Antioxidant xanthones from Cratoxylum cochinchinense

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Medicinal Chemistry

Background:

• Cratoxylum cochinchinense is a plant species known for its potential medicinal properties.
• Xanthones are a class of organic compounds with diverse biological activities.
• Previous research suggests xanthones possess antioxidant and anti-inflammatory effects.

Purpose of the Study:

• To isolate and characterize novel and known xanthone compounds from Cratoxylum cochinchinense stems.
• To evaluate the antioxidant and anti-lipid peroxidation activities of the isolated compounds.

Main Methods:

• Phytochemical investigation of Cratoxylum cochinchinense stem extracts.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation of the new compound using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
• In vitro assays for free radical scavenging (DPPH assay) and lipid peroxidation inhibition.

Main Results:

• A new xanthone, cratoxylumxanthone A (1), was identified and structurally characterized.
• Five known xanthones, including dulcisxanthone B (2), alpha-mangostin (3), beta-mangostin (4), 2-geranyl-1,3,7-trihydroxy-4-(3-methylbut-2-enyl)xanthone (5), and tectochrystin (6), were isolated.
• All isolated compounds exhibited significant free radical scavenging activity against DPPH.
• The compounds also demonstrated notable inhibition of lipid peroxidation.

Conclusions:

• Cratoxylum cochinchinense is a valuable source of bioactive xanthone compounds.
• Cratoxylumxanthone A represents a novel addition to the xanthone chemical class.
• The isolated xanthones possess promising antioxidant and anti-lipid peroxidation properties, suggesting potential therapeutic applications.