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Isolation and structural characterisation of okara polysaccharides
1School of Food Science, Henan Institute of Science and Technology, Xinxiang 453003, Henan, China. libowuxi@yahoo.com.cn
Molecules (Basel, Switzerland)
|January 17, 2012
Summary
Okara, a soy byproduct, contains complex polysaccharides. These polysaccharides, composed of various sugars, offer potential for diverse applications in food and biotechnology.
Area of Science:
- Food Science
- Biochemistry
- Carbohydrate Chemistry
Background:
- Okara is a rich, underutilized byproduct of soy processing (tofu, soymilk).
- Polysaccharides are complex carbohydrates with significant functional properties.
Purpose of the Study:
- To isolate and characterize polysaccharides from okara.
- To investigate the structural components of okara polysaccharides for potential applications.
Main Methods:
- Okara defatting and deproteinization to isolate crude polysaccharide.
- Sequential extraction using varying concentrations of EDTA and NaOH to obtain soluble and insoluble fractions.
- Analysis of constituent sugars and glycosidic linkages using chromatographic and spectroscopic techniques.
Main Results:
- Crude okara polysaccharide yield was 56.8%, with four soluble fractions (7.7–20.7%) and one insoluble fraction (27.9%).
- Major constituent sugars included arabinose, galactose, galacturonic acid, xylose, and glucose (in insoluble fraction).
- Structural analysis indicated the presence of galactan, arabinan, arabinogalactan, xylogalacturonan, rhamnogalacturonan, xylan, xyloglucan, and cellulose.
Conclusions:
- Okara polysaccharides are structurally diverse, containing various glycosidic linkages and sugar residues.
- The complex carbohydrate profile suggests potential for okara polysaccharides in food ingredients, hydrocolloids, or nutraceuticals.
- Further research into specific functional properties is warranted to explore okara's full potential.
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