Lupene-type triterpenes from Periploca aphylla

Area of Science:

• Natural Product Chemistry
• Pharmacology
• Medicinal Chemistry

Background:

• Periploca aphylla is a plant species known for its potential medicinal properties.
• Lupane derivatives are a class of triterpenoids with diverse biological activities.
• Natural products are a rich source of novel therapeutic compounds.

Purpose of the Study:

• To isolate and characterize new chemical compounds from Periploca aphylla stems.
• To evaluate the biological activities of the isolated compounds, specifically alpha-glucosidase inhibition and antibacterial effects.

Main Methods:

• Phytochemical investigation of Periploca aphylla stem extracts.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation using spectroscopic methods (NMR, MS) and chemical derivatization.
• In vitro assays to assess alpha-glucosidase inhibitory activity.
• In vitro assays to determine antibacterial activity against selected bacterial strains.

Main Results:

• Two new lupane derivatives, 3beta,6alpha-dihydroxylup-20(29)-ene (1) and 6alpha-hydroxylup-20(29)-en-3beta-octadecanoate (2), were successfully isolated.
• The structures of compounds 1 and 2 were confirmed through comprehensive spectral and chemical analyses.
• Compound 1 exhibited potent inhibition against alpha-glucosidase type VI.
• Compound 1 displayed moderate antibacterial activity.

Conclusions:

• Periploca aphylla stems are a source of novel lupane-type triterpenoids.
• The isolated compound 3beta,6alpha-dihydroxylup-20(29)-ene shows promising potential as an alpha-glucosidase inhibitor.
• The findings suggest that Periploca aphylla derivatives warrant further investigation for therapeutic applications, particularly in managing conditions related to alpha-glucosidase activity and bacterial infections.