Extraction, structural analysis, and activities of rice bran polysaccharide

Area of Science:

• Food Science and Technology
• Biochemistry
• Polymer Chemistry

Background:

• Rice bran is a rich source of bioactive compounds.
• Polysaccharides from rice bran possess potential health benefits.
• Extraction and modification of rice bran polysaccharides are key to unlocking their applications.

Purpose of the Study:

• To extract rice bran polysaccharide (RBP) from defatted rice bran.
• To determine optimal extraction conditions for RBP.
• To synthesize and characterize RBP derivatives and evaluate their activity.

Main Methods:

• Extraction of polysaccharide from defatted rice bran.
• Optimization of extraction parameters.
• Structural analysis using Infrared (IR) spectroscopy and Carbon-13 Nuclear Magnetic Resonance (¹³C NMR) spectroscopy.
• Preparation and characterization of carboxymethylated, phosphorylated, and acetylated RBP derivatives.

Main Results:

• Optimal extraction conditions for RBP were established.
• The chemical structure of RBP was elucidated.
• Three distinct RBP derivatives were successfully synthesized and characterized.
• Phosphorylated rice bran polysaccharide demonstrated notable biological activity.

Conclusions:

• Rice bran is a viable source for polysaccharide extraction.
• Chemical modification enhances the properties of rice bran polysaccharides.
• Phosphorylated rice bran polysaccharide shows promising activity for further investigation and application.