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International Journal of Polymer Science
Volume 2015, Article ID 168064, 5 pages
http://dx.doi.org/10.1155/2015/168064
Research Article

Rheological Properties of Polysaccharides from Longan (Dimocarpus longan Lour.) Fruit

1Institute of Agro-Products Processing Science and Technology (IAPPST), Chinese Academy of Agricultural Science, Beijing 100193, China
2Chinese Agricultural Ministry Key Laboratory of Tropical Crop Product Processing, Agricultural Product Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524001, China
3College of Food Science, South China Agricultural University, Guangzhou 510642, China

Received 26 January 2015; Revised 27 April 2015; Accepted 29 April 2015

Academic Editor: Cornelia Vasile

Copyright © 2015 Xingxun Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Longan polysaccharide (LP) was extracted from longan (Dimocarpus longan Lour.) pulp. The composition and rheological properties were determined by chemical analysis and dynamic shear rheometer. The flow behavior and viscoelastic behavior of longan polysaccharide (LP) solution were investigated by steady shear and small amplitude oscillatory shear (SAOS) experiments, respectively. The result shows that the solution is a pseudoplastic flow in a range of shear rate (1–100 s−1). The rheological behavior of LP was influenced by cations such as Na+ and Ca2+. With an increase of apparent viscosity, and were accompanied by addition of Na+ and Ca2+.