Supergiant ampholytic sugar chains with imbalanced charge ratio form saline ultra-absorbent hydrogels

Maiko K. Okajima, Takeshi Bamba, Yasuhiro Kaneso, Kazumasa Hirata, Eiichiro Fukusaki, Shin'Ichiro Kajiyama, Tatsuo Kaneko

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55 Citations (Scopus)

Abstract

A novel sugar chain (SC) with an ultrahigh molecular weight and an imbalanced charge ratio was extracted from the jellylike extracellular matrix (ECM) of a freshwater unicellular cyanobacterium, Aphanothece Sacrum. Fourier transform ion cyclotron resonance mass spectroscopy (FT-ICR-MS) analyses of the extracted SC demonstrated the presence sulfated muramic acid as a chain constituent, which indicates that the SC, was novel. These sugar chains, named sacran, was observed to be an extremely high molecular weight polysaccharide composed of a high content of anionic sugars with a low content of cationic sugars. Sacran were soluble in hot water to give a homogeneous solution regardless of pH and formed a physical hydrogel after cooling. Atomic force microscopy of sacran revealed that the sacran gels formed network structures containing nanolooped chains which exhibited a salt-induced transformation into extended rodlike chains.

Original languageEnglish
Pages (from-to)4061-4064
Number of pages4
JournalMacromolecules
Volume41
Issue number12
DOIs
Publication statusPublished - Jun 24 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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    Okajima, M. K., Bamba, T., Kaneso, Y., Hirata, K., Fukusaki, E., Kajiyama, SI., & Kaneko, T. (2008). Supergiant ampholytic sugar chains with imbalanced charge ratio form saline ultra-absorbent hydrogels. Macromolecules, 41(12), 4061-4064. https://doi.org/10.1021/ma800307w