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Xylans from the medicinal herb Phyllanthus niruri
Caroline G Mellinger1, Elaine R Carbonero, Thales R Cipriani
1Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, CP-19046, CEP-81531-990, Curitiba, PR, Brazil.
Journal of Natural Products
|February 1, 2005
Summary
Phyllanthus niruri polysaccharides were characterized, revealing two distinct xylan structures. One is a linear beta-(1-->4)-linked xylan, and the other is a complex acidic heteroxylan with unique sugar substitutions.
Area of Science:
- Phytochemistry
- Carbohydrate Chemistry
- Medicinal Plant Research
Background:
- Phyllanthus niruri is a globally recognized medicinal herb.
- Polysaccharides are significant bioactive compounds in medicinal plants.
- Understanding the structure of Phyllanthus niruri polysaccharides can elucidate their properties.
Purpose of the Study:
- To characterize the chemical structures of two purified polysaccharides from Phyllanthus niruri.
- To investigate the linkage and composition of these polysaccharides.
- To contribute to the knowledge of Phyllanthus niruri's chemical constituents.
Main Methods:
- Extraction of polysaccharides using hot aqueous KOH.
- Methylation analysis to determine glycosidic linkages.
- (13)C Nuclear Magnetic Resonance ((13)C NMR) spectroscopy for structural elucidation.
Main Results:
- Two distinct xylan polysaccharides were isolated and characterized.
- A linear beta-(1-->4)-linked xylan was obtained from a 15% aqueous KOH fraction.
- A complex acidic heteroxylan with a beta-Xylp main chain and various sugar substitutions was isolated from a 2% aqueous KOH fraction.
Conclusions:
- The study successfully elucidated the detailed chemical structures of two Phyllanthus niruri xylans.
- The findings provide a basis for understanding the potential bioactivities of these polysaccharides.
- This research enhances the phytochemical understanding of Phyllanthus niruri.