NDLI: Phase transition of locust bean gum-, tara gum- and guar gum-water systems

Content Provider	Springer Nature Link
Author	Naoi, S. Hatakeyama, T. Hatakeyama, H.
Copyright Year	2002
Abstract	Phase transition behaviour of neutral galactomannans, i.e., locust bean gum (LBG), tara gum (Tara-G) and guar gum (GG)-water systems is investigated. In this study, water content {W$_{c}$=(gram of water)/(gram of dry sample)} of these systems was varied from 0.2 to 3.6 g g$^{-1}$. In the DSC heating curves, glass transition (T$_{g}$), cold crystallization (T$_{cc}$) and melting (T$_{m}$) were observed in all three samples. In addition, liquid crystal transition (T) was observed in GG-water systems at a temperature higher than Tm. Using T$_{g}$, T$_{cc}$, Tm and T, phase diagrams of each system were established. From the melting enthalpy of ice in the systems, three types of water, non-freezing water (W$_{nf}$), freezing bound water (W$_{fb}$) and free water were calculated. The maximum amount of Wnf was observed at Wc=0.7 g g-1, where Tg showed the lowest temperature. The amount of Wnf in LBG and GG is higher than that of Tara-G, whereas the highest amount of Wfb is found in GG. T* was only observed in GG-water systems. It is concluded that frequency of the side chains in the repeating unit of the main chains of these three galactomannan affects the frozen structure of the glassy state in the presence of water.
Starting Page	841
Ending Page	852
Page Count	12
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	70
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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