Anion specific conformational change in aqueous gellan gum solutions

Masahiko Annaka

doi:10.1016/j.carbpol.2022.120437

Anion specific conformational change in aqueous gellan gum solutions

Carbohydr Polym. 2023 Apr 1:305:120437. doi: 10.1016/j.carbpol.2022.120437. Epub 2022 Dec 20.

Author

Masahiko Annaka¹

Affiliation

¹ Department of Chemistry, Kyushu University Fukuoka, Fukuoka 8190395, Japan; Center for Molecular Systems (CMS), Kyushu University Fukuoka, Fukuoka 8190395, Japan. Electronic address: annaka@chem.kyushu-univ.jp.

PMID: 36737176
DOI: 10.1016/j.carbpol.2022.120437

Abstract

¹²⁷I NMR is applied to investigate the motional state and the selective interaction of I^- ions in tetramethylammonium form of gellan gum (TMA gellan), together with monitoring the conformational change by the optical rotation measurement. The experimental results indicate that I^- ion promotes the conformational transition, and there exists the preferential affinity of I^- ion for the ordered conformation of TMA gellan.

Keywords: Conformation; Gellan gum; Iodide ion; NMR; Preferential affinity.