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Số người truy cập: 55,390,837

 Insights into gelation kinetics and gel front migration in cation-induced polysaccharide hydrogels by viscoelastic and turbidity measurements: Effect of the nature of divalent cations
Tác giả hoặc Nhóm tác giả: Uyen T.D. Huynh, Odile Chambin, Aline Maire du Poset, Ali Assifaoui
Nơi đăng: Carbohydrate Polymers; Số: 190;Từ->đến trang: 121-128;Năm: 2018
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT

ABSTRACT
Polysaccharide-based hydrogels were prepared by the diffusion of various divalent cations (X2+) into the polygalacturonate (polyGal) solution through a dialysismembrane. The diffusion of various divalent cations (Mg2+, Ca2+, Zn2+ and Ba2+) was investigated. The polyGal gel growth was studied as a function of the initial cation concentration by both viscoelastic and turbidity measurements. We have demonstrated for the first time that the determination of the spatiotemporal variation of turbidity during the gelation process allowed to study the gel front migration. For Ca-polyGal, Zn-polyGal and Ba-polyGal, the gel front migration was characterized by the presence of a peak at the sol/gel interface. This peak was not observed in the case of Mg-polyGal where the gel was not formed. The apparent diffusion coefficient of the gel front (Dapp) which was calculated from the evolution of this peak increased when the initial cation concentration was increased. Moreover, we have suggested a gelation mechanism based on the presence of a threshold molar ratio R* (=[X2+]/[Galacturonic unit]) in which some point-like crosslinks are precursors of the formation of dimers and multimers inducing the contraction of the gel and thus the formation of the gel front.
[ 2018\2018m03d022_9_59_15Insights_into_gelation_kinetics_and_gel_front_migration.pdf ]
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