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research article

Comparative effect of growth media on the monitoring of E. coli inactivation and regrowth after solar and photo-Fenton treatment

Valero, Pilar
•
Giannakis, Stefanos  
•
Mosteo, Rosa
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2017
Chemical Engineering Journal

This study intends to assess the cultivability of photo-treated Escherichia coil K-12 on media With different selectivity (PCA, LBA, T-7, T-7 + TTC, VRBA and MAC) and to establish optimal conditions for bacterial recuperation. For these purposes, immediate and long-term bacterial recovery after SODIS and photo-Fenton are evaluated. Moreover, the use of catalase and sodium pyruvate supplements in the medium is studied. The non-selective medium PCA showed the highest counts for the untreated and treated cells due to its content in nutrients (e.g. glucose) and lack of inhibitors. On the contrary, the selective media showed lower recovery, being the culture media effectiveness: PCA > LBA > T-7 > T-7 + Trc > VRBA > MAC. The presence of inhibitors, such as heptadecyl sulfate in T-7 or bile salts in VRBA and MAC, reduced the cultivability of the treated cells. These compounds can probably diffuse into the cells more easily after SODIS and photo-Fenton as a consequence of the loss of the membrane integrity. In addition, the lack of yeast extract in MAC had a detrimental effect on E. coli recovery. Sodium pyruvate was tested as supplement to PCA, leading to slightly enhanced bacterial immediate recovery after SODIS, SODIS + H2O2 and photo-Fenton. The addition of catalase and sodium pyruvate to the bulk was studied as well, considerably increasing bacterial survival in the long-term due to their ability to neutralize residual H2O2. (C) 2016 Elsevier B.V. All rights reserved.

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Type
research article
DOI
10.1016/j.cej.2016.11.126
Web of Science ID

WOS:000394723200012

Author(s)
Valero, Pilar
•
Giannakis, Stefanos  
•
Mosteo, Rosa
•
Ormad, María P.
•
Pulgarin, César
Date Issued

2017

Publisher

Elsevier

Published in
Chemical Engineering Journal
Volume

313

Start page

109

End page

120

Subjects

Escherichia coli

•

SODIS

•

Photo-Fenton

•

Culture media

•

Catalase

•

Sodium pyruvate

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GPAO  
Available on Infoscience
February 25, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/134808
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