Mercury bioremoval by Yarrowia strains isolated from sediments of mercury-polluted estuarine water

Ganiyu Oladunjoye Oyetibo, Shakirat Titilayo Ishola, Wakako Ikeda-Ohtsubo, Keisuke Miyauchi, Matthew Olusoji Ilori, Ginro Endo

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Difference in mercuric ion removal by resting and growing cells of two mercury-resistant yeast strains, identified as Yarrowia spp. (strains Idd1 and Idd2), were studied. Resting cells of strain Idd2 exhibited high maximum Hg2+ removal capacity (59 mg mercury per g dry cell weight [gdw−1]) by adsorption than those of resting cells of strain Idd1 (32 mg gdw−1). The resting cells of strain Idd2 exhibited a higher Hg2+ desorption capacity using CaCl2 (68 %) and EDTA (48 %) than strain Idd1, depicting weaker binding of Hg2+ onto strain Idd2 unlike strain Idd1. The actively growing yeast cells showed opposite Hg removal characteristics to those of the resting cells. Strain Idd1 adsorbed less Hg2+ from culture medium supplemented with Hg2+ than strain Idd2. However, the growing strain Idd1 reduced and vaporized 27 % of supplemented Hg2+ as metallic mercury (Hg0), while the growing strains Idd2 vaporized 15 % of the supplemented Hg2+. These two yeast strains are potential biotechnological tools for the eventual bioremediation of polluted aquatic systems.

Original languageEnglish
Pages (from-to)3651-3657
Number of pages7
JournalApplied Microbiology and Biotechnology
Volume99
Issue number8
DOIs
Publication statusPublished - 2015 Apr 1

Keywords

  • Biosorption
  • Biovolatilization
  • Mercury bioremoval
  • Mercury-resistant yeast
  • Resting and growing cells

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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