Rheological characteristics and chain conformation of mannans obtained from Saccharomyces cerevisiae

Liu, H, Li, Y, Shi, A, Hu, H, Sheng, X, Liu, L, Wang, Q and Adhikari, B 2018, 'Rheological characteristics and chain conformation of mannans obtained from Saccharomyces cerevisiae', International Journal of Biological Macromolecules, vol. 107, pp. 2404-2411.


Document type: Journal Article
Collection: Journal Articles

Title Rheological characteristics and chain conformation of mannans obtained from Saccharomyces cerevisiae
Author(s) Liu, H
Li, Y
Shi, A
Hu, H
Sheng, X
Liu, L
Wang, Q
Adhikari, B
Year 2018
Journal name International Journal of Biological Macromolecules
Volume number 107
Start page 2404
End page 2411
Total pages 8
Publisher Elsevier
Abstract Mannans were extracted from S. cerevisiae, the rheological properties of mannan solutions were important in many industrial applications. In this paper, effects of mannans concentration, solution temperature, pH, salts and their concentrations on apparent viscosity were investigated. The conformational parameters of yeast mannans were determined by SEC-MALS-RI-DP. The Higiros 1 and Higiros 2 plots were obtained by capillary viscometry gave an intrinsic viscosity of 0.166 and 0.131 dl/g. The yeast mannans solution showed Newtonian flow behavior at all the tested concentrations. The apparent viscosity of yeast mannans solution decreased continuously with the temperature increase (25 °C85 °C) at a given shear rate. The viscosity did not change within the pH values of 4.010.0, however, it increased when the pH decreased from 4.0 to 2.0. The viscosity decreased with addition of CaCl2 up to 10 mM and remained constant above this concentration. The conformational parameters (derived from [η] vs Mw and Rg vs Mw) showed yeast mannans existed as a sphere-like shape with many shorter branches. The special flow behavior and conformation of yeast mannans may make it preferable polysaccharide in food industry.
Subject Biochemistry and Cell Biology not elsewhere classified
Keyword(s) Molecular conformation
Rheological properties
Yeast mannans
DOI - identifier 10.1016/j.ijbiomac.2017.10.126
Copyright notice © 2017 Elsevier B.V. All rights reserved.
ISSN 0141-8130
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