Structural Identification of Physalis alkekengi L. Polysaccharides

Area of Science:

• Phytochemistry
• Food Science
• Biochemistry

Background:

• Physalis alkekengi L. fruit polysaccharides demonstrate potential for reducing blood sugar, regulating blood lipids, and improving intestinal flora.
• The specific polysaccharide components responsible for these beneficial effects remain largely uncharacterized.

Purpose of the Study:

• To extract, separate, purify, and characterize specific polysaccharides (Phy-1a, Phy-1b, and Phy-1c) from Physalis alkekengi L. fruit.
• To elucidate the structural composition of these isolated polysaccharides for understanding their bioactivities.

Main Methods:

• Polysaccharide extraction, separation, and purification from Physalis alkekengi L. fruit.
• Compositional analysis using ion chromatography and methylation analysis.
• Structural elucidation via nuclear magnetic resonance (NMR) spectroscopy.

Main Results:

• Phy-1b and Phy-1c were characterized as neutral polysaccharides, lacking uronic acid.
• Ion chromatography revealed distinct monosaccharide compositions for Phy-1b and Phy-1c.
• Detailed structural analysis of Phy-1b identified its main chain and branched chains, including specific linkages and terminal sugars.

Conclusions:

• The structural characterization of Physalis alkekengi L. fruit polysaccharides Phy-1b and Phy-1c provides crucial insights into their composition.
• These findings offer a foundation for understanding the mechanisms behind their potential health benefits.
• The study supports the enhanced utilization and high-value processing of Physalis alkekengi resources.