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Investigating the potential use of an oleaginous bacterium, Rhodococcus opacus PD630, for nano-TiO2 remediation

  • Archanaa Sundararaghavan
  • Amitava Mukherjee
  • Gadi K. SuraishkumarEmail author
Sustainable Industrial and Environmental Bioprocesses
  • 24 Downloads

Abstract

The occurrence of titanium dioxide nanoparticles (nTiO2), in the effluents released from wastewater treatment plants, has raised concerns. The fate of nTiO2 and their potential impact on organisms from different ecosystems are widely investigated. For the first time, in this work, we report the responses of an oleaginous bacteria Rhodococcus opacus PD630, belonging to an ecologically important genus Rhodococcus to environmentally relevant concentrations of nTiO2, under dark and UV light conditions. We observed a dose-dependent increase in nTiO2 uptake by the bacteria that reached a maximum of 1.4 mg nTiO2 (g cell)-1 under mid-log UV exposure, corresponding to 97% uptake. The nTiO2 induced oxidative stress in bacteria that increased from 25.1 to a maximum of 100.3, 44.1, and 51.7 μmol .OH (g cell)-1 under dark, continuous, and mid-log UV, respectively. However, nTiO2 did not affect bacterial viability. Further, due to oxidative stress, the triacylglycerol (biodiesel) content from bacteria increased from 30% to a maximum of 54% CDW. Based on our findings, we propose an application of R. opacus PD 630 in nTiO2 remediation due to their high nTiO2 uptake and resistance.

Keywords

Pollutants of concern nTiO2 release Wastewater treatment Oxidative stress R. opacus Triacylglycerol 

Notes

Acknowledgments

The authors thank the Sophisticated and Analytical Instrument Facility (SAIF, IITM, Chennai) for ICP–OES analysis and SEM analysis. The authors also thank the Environmental and Water Resource Engineering section of IIT Madras for help with size and zeta potential analyses.

Fundinginformation

This study received financial assistance from the Department of Science and Technology (DST, grant no. SB/S3/CE/007/2013) and Department of Biotechnology (DBT, grant ref. no. BT/PR11328/PBD/26/176/2008), Government of India.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

11356_2019_6388_MOESM1_ESM.docx (258 kb)
ESM 1 (DOCX 258 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences buildingIndian Institute of Technology MadrasChennaiIndia
  2. 2.Centre for NanobiotechnologyVIT UniversityVelloreIndia

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