Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12419
Title: Ultrasonic treatment for improved solution properties of a high-molecular weight exopolysaccharide produced by a medicinal fungus
Authors: Wang, ZM
Cheung, YC
Leung, PH
Wu, JY 
Keywords: Cordyceps sinensis
Exopolysaccharide
Molecular weight
Ultrasonic degradation
Viscosity and solubility
Issue Date: 2010
Publisher: Elsevier
Source: Bioresource technology, 2010, v. 101, no. 14, p. 5517-5522 How to cite?
Journal: Bioresource technology 
Abstract: High-power ultrasound (20 kHz) was applied to modify the physicochemical properties of a high-molecular weight (MW) exopolysaccharide (EPS) from mycelial culture of a medicinal fungus. At 35 W/cm2 or higher ultrasound power, the apparent and intrinsic viscosities of EPS solution dropped by nearly 85% within 10 min, and the water solubility was increased by more than fourfold. The ultrasonic treatment led to a notable reduction of the maximum MW and a more uniform MW distribution, but no significant change in the primary structure of the EPS molecules. In contrast, the intrinsic viscosity of EPS was reduced by only 20% in 1.0 M sulfuric acid at 50 °C for 9 h. Ultrasound was proven an effective and favorable means for improving the solution properties of high-MW bioactive polysaccharides in mild conditions.
URI: http://hdl.handle.net/10397/12419
ISSN: 0960-8524
EISSN: 1873-2976
DOI: 10.1016/j.biortech.2010.01.134
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