Format

Send to

Choose Destination
Biotechnol Lett. 2016 Mar;38(3):441-6. doi: 10.1007/s10529-015-2009-8. Epub 2015 Dec 9.

Biotransformation of hexavalent chromium into extracellular chromium(III) oxide nanoparticles using Schwanniomyces occidentalis.

Author information

1
Institute of Bioinformatics and Biotechnology, Savitribai Phule Pune University, Pune, 411007, India.
2
Institute of Bioinformatics and Biotechnology, Savitribai Phule Pune University, Pune, 411007, India. smita@unipune.ac.in.

Abstract

OBJECTIVES:

To demonstrate biotransformation of toxic Cr(VI) ions into Cr2O3 nanoparticles by the yeast Schwanniomyces occidentalis.

RESULTS:

Reaction mixtures containing S. occidentalis NCIM 3459 and Cr(VI) ions that were initially yellow turned green after 48 h incubation. The coloration was due to the synthesis of chromium (III) oxide nanoparticles (Cr2O3NPs). UV-Visible spectra of the reaction mixtures showed peaks at 445 and 600 nm indicating (4)A2g → (4)T1g and (4)A2g → (4)T2g transitions in Cr2O3, respectively. FTIR profiles suggested the involvement of carboxyl and amide groups in nanoparticle synthesis and stabilization. The Cr2O3NPs ranged between 10 and 60 nm. Their crystalline nature was evident from the selective area electron diffraction and X-ray diffraction patterns. Energy dispersive spectra confirmed the chemical composition of the nanoparticles. These biogenic nanoparticles could find applications in different fields.

CONCLUSIONS:

S. occidentalis mediated biotransformation of toxic Cr(VI) ions into crystalline extracellular Cr2O3NPs under benign conditions.

KEYWORDS:

Cr2O3 nanoparticles; Hexavalent chromium biotransformation; Schwanniomyces occidentalis

PMID:
26650738
DOI:
10.1007/s10529-015-2009-8
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Springer
Loading ...
Support Center