Structure impact of two galactomannan fractions on their viscosity properties in dilute solution, unperturbed state and gel state

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• 作者：Sé ; bastien Gillet^a ; ^b ; ^{s.gillet@yale.edu} ; Mario Aguedo^a ; ^{mario.aguedo@ulg.ac.be} ; Raul Petrut^c ; ^{rfpetrut@student.ulg.ac.be} ; Gilles Olive^a ; ^c ; ^{gilles.olive@ulg.ac.be} ; Paul Anastas^b ; ^{paul.anastas@yale.edu} ; Christophe Blecker^c ; ^{christophe.blecker@ulg.ac.be} ; Aurore Richel^a ; ^{a.richel@ulg.ac.be}
• 关键词：Galactomannans ; Viscosity ; Structure ; Rheology
• 刊名：International Journal of Biological Macromolecules
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：96
• 期：Complete
• 页码：550-559
• 全文大小：1874 K
• 卷排序：96

文摘

Two fractions of carob galactomannans (GM25 and GM80) were extracted at respectively 25 °C and 80 °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 ([η]GM25 = 9.96 dL g−1 and [η]GM80 = 4.04 dL g−1). In unperturbed state, initial viscosities η0 were more important for GM80 fractions at 1% and 2% due to greater hyperentanglements (η0(GM80,1%) = 9.9 Pas; η0(GM80,2%) = 832.0; Pa.s η0(GM25,1%) = 3.1 Pas; η0(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.