期刊
ULTRASONICS SONOCHEMISTRY
卷 29, 期 -, 页码 251-257出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2015.10.005
关键词
Phellinus linteus; Polysaccharide; Ultrasonic treatment; Degradation kinetics; Preliminary characterization; Antioxidant activity
资金
- Natural Science Foundation of Jiangsu Province [BK20140542]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Jiangsu Overseas Research & Training Program for University Prominent Young & Middle-aged Teachers and Presidents
In this study, a high-molecular-weight polysaccharide PL-N isolated from the alkaline extract of Phellinus linteus mycelia was degraded by ultrasound. Results showed that ultrasound treatment at different ultrasonic intensities decreased the intrinsic viscosity and molecular weight of PL-N, as well as narrowed the molecular weight distribution. A larger reduction in intrinsic viscosity and molecular weight was caused by a higher ultrasonic intensity. The degradation kinetics model was fitted to (1/M-t - 1/M-0) = k.t, and the reaction rate constant (k) increased with increasing ultrasonic intensity. Ultrasound degradation did not change the primary structure of PL-N, and scanning electron microscopy analysis indicated that the morphology of the original PL-N was different from that of degraded PL-N fractions. Antioxidant activity assays in vitro indicated that the degraded PL-N fraction with low molecular weight had stronger hydroxyl radical scavenging capacity and higher TEAC and FRAP values. (C) 2015 Elsevier B.V. All rights reserved.
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