Gel point determination of gellan biopolymer gel from DC electrical conductivity

Gellan is an anionic bacterial polysaccharide, which in aqueous solution dissociates into a charged gellan polymer molecule containing carboxyl ions and counter ions and forms thermoreversible gel under appropriate conditions. In this study, we investigated the effect of polymer concentration, the c...

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Autores principales:	Jahan Nusrat, Shahnaz Sakiba, Hossain Khandker S.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2020
Materias:	gellan gum biopolymer gel sol–gel transition dc conductivity monovalent ions Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/0ab54b0c088d49f8b3a1f1372e5f8533
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spelling	oai:doaj.org-article:0ab54b0c088d49f8b3a1f1372e5f85332021-12-05T14:10:47ZGel point determination of gellan biopolymer gel from DC electrical conductivity1618-722910.1515/epoly-2021-0002https://doaj.org/article/0ab54b0c088d49f8b3a1f1372e5f85332020-12-01T00:00:00Zhttps://doi.org/10.1515/epoly-2021-0002https://doaj.org/toc/1618-7229Gellan is an anionic bacterial polysaccharide, which in aqueous solution dissociates into a charged gellan polymer molecule containing carboxyl ions and counter ions and forms thermoreversible gel under appropriate conditions. In this study, we investigated the effect of polymer concentration, the concentration of added monovalent metallic ion, and temperature on the DC electrical conductivity of the gellan. Results suggest that the DC conductivity decreases with the increasing polymer concentrations and the added monovalent metallic ions. Such a decrease in DC conductivity can be attributed to the reduction of the mobility of counter ions due to the increase in the crosslinking density of the gellan network. DC conductivity of gellan gels was increased with temperature, which is interpreted as the dissolution of physically cross-linked networks, thus increasing the mobility of counter ions. The behavior of temperature variation of DC electrical conductivity reveals an abrupt change at a specific temperature, which can be considered a way to determine the gel point or sol–gel transition temperature T c of this thermoreversible biopolymer gel. This result agrees with that of rheological measurements where the viscosity showed a similar trend with temperature and diverges to infinity at the temperature close to T c.Jahan NusratShahnaz SakibaHossain Khandker S.De Gruyterarticlegellan gumbiopolymer gelsol–gel transitiondc conductivitymonovalent ionsPolymers and polymer manufactureTP1080-1185ENe-Polymers, Vol 21, Iss 1, Pp 007-014 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	gellan gum biopolymer gel sol–gel transition dc conductivity monovalent ions Polymers and polymer manufacture TP1080-1185
spellingShingle	gellan gum biopolymer gel sol–gel transition dc conductivity monovalent ions Polymers and polymer manufacture TP1080-1185 Jahan Nusrat Shahnaz Sakiba Hossain Khandker S. Gel point determination of gellan biopolymer gel from DC electrical conductivity
description	Gellan is an anionic bacterial polysaccharide, which in aqueous solution dissociates into a charged gellan polymer molecule containing carboxyl ions and counter ions and forms thermoreversible gel under appropriate conditions. In this study, we investigated the effect of polymer concentration, the concentration of added monovalent metallic ion, and temperature on the DC electrical conductivity of the gellan. Results suggest that the DC conductivity decreases with the increasing polymer concentrations and the added monovalent metallic ions. Such a decrease in DC conductivity can be attributed to the reduction of the mobility of counter ions due to the increase in the crosslinking density of the gellan network. DC conductivity of gellan gels was increased with temperature, which is interpreted as the dissolution of physically cross-linked networks, thus increasing the mobility of counter ions. The behavior of temperature variation of DC electrical conductivity reveals an abrupt change at a specific temperature, which can be considered a way to determine the gel point or sol–gel transition temperature T c of this thermoreversible biopolymer gel. This result agrees with that of rheological measurements where the viscosity showed a similar trend with temperature and diverges to infinity at the temperature close to T c.
format	article
author	Jahan Nusrat Shahnaz Sakiba Hossain Khandker S.
author_facet	Jahan Nusrat Shahnaz Sakiba Hossain Khandker S.
author_sort	Jahan Nusrat
title	Gel point determination of gellan biopolymer gel from DC electrical conductivity
title_short	Gel point determination of gellan biopolymer gel from DC electrical conductivity
title_full	Gel point determination of gellan biopolymer gel from DC electrical conductivity
title_fullStr	Gel point determination of gellan biopolymer gel from DC electrical conductivity
title_full_unstemmed	Gel point determination of gellan biopolymer gel from DC electrical conductivity
title_sort	gel point determination of gellan biopolymer gel from dc electrical conductivity
publisher	De Gruyter
publishDate	2020
url	https://doaj.org/article/0ab54b0c088d49f8b3a1f1372e5f8533
work_keys_str_mv	AT jahannusrat gelpointdeterminationofgellanbiopolymergelfromdcelectricalconductivity AT shahnazsakiba gelpointdeterminationofgellanbiopolymergelfromdcelectricalconductivity AT hossainkhandkers gelpointdeterminationofgellanbiopolymergelfromdcelectricalconductivity
_version_	1718371701964668928

Gel point determination of gellan biopolymer gel from DC electrical conductivity

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