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Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
Published on: October 16, 2017
Structural features of a pectic polysaccharide from mulberry leaves
Wei Xia1, Shu-Qi Liu, Wen-Qing Zhang
1Department of Chemistry, East China University of Science and Technology, Shanghai, China.
Journal of Asian Natural Products Research
|November 6, 2008
Summary
A novel acidic polysaccharide, SDA, was isolated from mulberry leaves. Structural analysis revealed a unique alpha-(1-->4)-galacturonan backbone with diverse sugar side chains, marking its first discovery.
Area of Science:
- Plant biochemistry
- Carbohydrate chemistry
- Natural product isolation
Background:
- Mulberry leaves are a source of various bioactive compounds.
- Pectic polysaccharides play roles in plant cell walls and have potential health benefits.
- Characterization of novel polysaccharides contributes to understanding plant-derived biomaterials.
Purpose of the Study:
- To isolate and characterize a novel pectic polysaccharide from mulberry leaves.
- To elucidate the primary structure and linkage patterns of the isolated polysaccharide.
- To identify the constituent monosaccharides and their molar ratios.
Main Methods:
- Extraction using boiling water.
- High-performance gel filtration chromatography for molecular weight determination.
- Linkage analysis, partial acid hydrolysis, ESIMS, (1)H-NMR, and (13)C-NMR for structural elucidation.
Main Results:
- Isolation of a new acidic polysaccharide designated SDA.
- SDA comprises rhamnose, arabinose, xylose, glucose, galactose, and galacturonic acid (molar ratio 5:4:1:2:6:38).
- Determined molecular weight of 1.5 x 10(4) Da.
- Established an alpha-(1-->4)-galacturonan backbone with inserted Rha residues and complex side chains including arabinan, rhamnan, xylan, glucan, and galactan.
Conclusions:
- SDA is a newly identified acidic polysaccharide from mulberry leaves.
- Its complex structure features a distinct galacturonan backbone and diverse polysaccharide side chains.
- This finding expands the knowledge of mulberry leaf composition and pectic polysaccharide diversity.
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