Characterization of exopolymeric substances from selected Rhodopseudomonas palustris strains and their ability to adsorb sodium ions

Tomorn Nunkaew, Duangporn Kantachote, Teruhiko Nitoda, Hiroshi Kanzaki, Raymond J. Ritchie

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Removal of Na+by binding with exopolymeric substances (EPS) from Rhodopseudomonas palustris TN114 and PP803 was investigated. The moderate negative correlation pairs (rp) between remaining Alcian blue and amount of Na+adsorbed on EPS from strains TN114 and PP803 were -0.652 and -0.609. Both strains showed positive relationships between the amounts of EPS produced and bacterial growth. EPS from strain PP803 had a higher efficiency in removing Na+than the EPS from strain TN114 based on their EC50values (1.79 and 1.49 mg/mL for TN114 and PP803, respectively). The principal component from EPS of strain PP803 which was responsible for salt removal was purified and it was identified as a polysaccharide (≈18 kDa) mainly composed of galacturonic acid. Overall results suggested that EPS is a key factor that our strains used to bind Na+allowing their survival in high NaCl concentrations.

Original languageEnglish
Pages (from-to)334-341
Number of pages8
JournalCarbohydrate Polymers
Volume115
DOIs
Publication statusPublished - Jan 22 2014

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Keywords

  • Biofertilizers
  • Exopolymeric substances
  • Galacturonic acid
  • Rhodopseudomonas palustris
  • Rice
  • Salinity

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Medicine(all)

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