Benzophenone glycosides from Gnidia involucrata

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Pharmacognosy

Background:

• Gnidia involucrata is a plant species within the Thymelaeaceae family.
• The chemical constituents of Gnidia species are of interest for their potential biological activities.

Purpose of the Study:

• To isolate and identify chemical compounds from the methanol extract of Gnidia involucrata aerial parts.
• To characterize novel and known compounds using spectroscopic methods.

Main Methods:

• Methanol extraction of aerial parts of Gnidia involucrata.
• Chemical and spectroscopic analyses (e.g., NMR, MS) for compound identification.
• On-line Liquid Chromatography/Ultraviolet/Atmospheric Pressure Chemical Ionization-Mass Spectrometry (LC/UV/APCI-MSn) for real-time analysis.

Main Results:

• Six compounds were isolated and identified: 2,3,4',5,6-pentahydroxybenzophenone-4-C-glucoside, 2,4',6-trihydroxy-4-methoxybenzophenone-2-O-glucoside, mangiferin, kaempferol-3-O-glucoside, yuankanin, and manniflavanone.
• The structures of three additional C-glycosyl flavones, vitexin, isovitexin, and isoorientin, were determined directly from the crude extract.
• Two novel benzophenone glycosides were characterized.

Conclusions:

• The study successfully elucidated the chemical profile of Gnidia involucrata aerial parts.
• The identified compounds, including novel benzophenone glycosides and flavones, contribute to the phytochemical knowledge of the Thymelaeaceae family.
• Advanced analytical techniques like LC/UV/APCI-MSn are effective for rapid characterization of compounds in complex mixtures.