期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 96, 期 -, 页码 550-559出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2016.12.057
关键词
Galactomannans; Viscosity; Structure; Rheology
Two fractions of carob galactomannans (GM25 and GM80) were extracted at respectively 25 degrees C and 80 degrees C from crude locust bean gum. Those fractions having slightly different chemical structures, previously characterized, were studied for their viscosity properties over a wide range of concentrations: diluted solution, unperturbed state and gel state. For each of the physical properties, links to the chemical fine structure could be established, expanding knowledge on the topic: in dilute solution, GM25 is more soluble in water while GM80 seems to tend to self-association due to its structure as highlighted by intrinsic viscosity measurements ([eta](GM25) = 9.96 dL g(-1) and [eta](GM80) = 4.04 dL g(-1)). In unperturbed state, initial viscosities eta(0) were more important for GM80 fractions at 1% and 2% due to greater hyperentanglements (770(0480,1%) = 9.9 Pas; eta(0(GM80,2%)) = 832.0; Pa.s eta(0(GM25, 1%)) =3.1 Pas; eta(0(GM25, 2%)) = 45.1 Pas). In gel state, hydrogels obtained from GM80 were also stronger (hardness GM80 (2%) = 0.51 N and hardness GM25 (2%) = 0.11 N), suggesting a much more important number of junction areas within the gel network. The findings discussed herein demonstrate the potential for new applications. (C) 2016 Elsevier B.V. All rights reserved.
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