A new cerebroside from Gynura divaricata

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Organic Chemistry

Background:

• Gynura divaricata is a plant with a history of traditional medicinal use.
• The chemical constituents of Gynura divaricata are not fully characterized.
• Isolation of novel compounds can lead to the discovery of new therapeutic agents.

Purpose of the Study:

• To isolate and characterize novel and known chemical constituents from the aerial parts of Gynura divaricata.
• To elucidate the structure of a newly identified cerebroside.
• To expand the phytochemical knowledge of the Gynura genus.

Main Methods:

• Aerial parts of Gynura divaricata were extracted and subjected to various chromatographic separation techniques.
• Spectroscopic methods, including NMR and Mass Spectrometry, were employed for structural determination.
• Chemical evidence was used to confirm the proposed structure of the new compound.

Main Results:

• A new cerebroside, designated compound 1, was isolated and its structure elucidated as 1-O-beta-D-glucopyranosyl-(2S, 3S, 4R, 10Z)-2-[(2'R)-2'-hydroxylignocenoyl-amino]-10-octadecene-1,3,4-triol.
• Five known compounds were also isolated: kaempferol, kaempferol 3-O-glucoside, kaempferol 3-O-rhamnosyl(1 --> 6)glucoside, beta-sitosteryl glucoside-6'-O-heptadecoicate, and a pyrazine derivative.
• Four of the known compounds (compounds 2-6) were reported as being isolated from Gynura divaricata for the first time.

Conclusions:

• The phytochemical investigation of Gynura divaricata led to the discovery of a new cerebroside and the identification of several known compounds.
• The structural characterization of the new cerebroside provides valuable data for natural product chemistry.
• This study enhances the understanding of the chemical diversity within Gynura species and their potential bioactive compounds.