TY - JOUR
T1 - Mercury bioremoval by Yarrowia strains isolated from sediments of mercury-polluted estuarine water
AU - Oyetibo, Ganiyu Oladunjoye
AU - Ishola, Shakirat Titilayo
AU - Ikeda-Ohtsubo, Wakako
AU - Miyauchi, Keisuke
AU - Ilori, Matthew Olusoji
AU - Endo, Ginro
N1 - Funding Information:
We thank Dr. Mei-Fang Chien and Toshiki Kurosawa for their useful discussion and assistance during the experiment. GOO and GE appreciate the Japan Society for the Promotion of Science (JSPS) for the awarding of Postdoctoral Research Fellowship FY2012-2013. This work was funded by Grants-in-Aid (No. 24-02373) for Scientific Research from the JSPS.
Publisher Copyright:
© 2014, The Author(s).
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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.
AB - 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.
KW - Biosorption
KW - Biovolatilization
KW - Mercury bioremoval
KW - Mercury-resistant yeast
KW - Resting and growing cells
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U2 - 10.1007/s00253-014-6279-1
DO - 10.1007/s00253-014-6279-1
M3 - Article
C2 - 25520168
AN - SCOPUS:84937990848
VL - 99
SP - 3651
EP - 3657
JO - Applied Microbiology and Biotechnology
JF - Applied Microbiology and Biotechnology
SN - 0175-7598
IS - 8
ER -