Steroid glycosides from Polygonatum prattii

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• Polygonatum species are known sources of bioactive compounds.
• Steroid glycosides and prosapogenins have diverse pharmacological activities.
• The chemical constituents of Polygonatum prattii remain underexplored.

Purpose of the Study:

• To isolate and characterize new chemical entities from Polygonatum prattii roots.
• To elucidate the structures of novel steroid glycosides and prosapogenins.
• To identify unique structural features in natural products.

Main Methods:

• Extraction and isolation of compounds from plant material.
• Chemical derivatization and enzymatic hydrolysis.
• Spectroscopic analyses (NMR, MS) for structure elucidation.
• Comparison with known compounds.

Main Results:

• Three new steroid glycosides, paratiosides A-C, were isolated.
• Three new prosapogenins, pratiosides D1, E1, and F1, were identified.
• Pratiosides D1, E1, and F1 are proposed as spirostanol glycosides derived from furostanol precursors.
• Pratioside C, featuring a 3,27-di-O-sugar chain, represents a novel natural product structure.

Conclusions:

• The investigation of Polygonatum prattii roots yielded novel steroid glycosides and prosapogenins.
• The structural diversity of steroid glycosides in Polygonatum species is further expanded.
• Pratoside C is a significant finding as the first naturally occurring steroid glycoside with a 3,27-di-O-sugar chain.