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Soluble Sunscreens Fully Protect E. coli from Disinfection by Electrohydraulic Discharges

Ching, W.-K. and Colussi, A. J. and Hoffmann, M. R. (2003) Soluble Sunscreens Fully Protect E. coli from Disinfection by Electrohydraulic Discharges. Environmental Science and Technology, 37 (21). pp. 4901-4904. ISSN 0013-936X. doi:10.1021/es034182j.

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We show that the ultraviolet radiation emitted, rather than the thermal/pressure shocks or the chemical species that are generated in these events, is the lethal agent that inactivates Escherichia coli colonies exposed to electrohydraulic discharges, EHD. Disinfection is completely suppressed in the presence of <100 mg L^(-1) of 2,2‘-dihydroxy-4,4‘-dimethoxybenzophenone-5,5‘-disulfonic acid, BP9, a commercial water-soluble sunscreen. Viable bacteria decay by logit kinetics with the number of EHD. The fact that the slopes of the logit plots depend inversely on BP9 concentration, and vanish above ∼ 30 mg BP9 L^(-1), is direct evidence that E. coli is exclusively sterilized by UV radiation in these experiments. Present LD_(50) photon doses are about 10^3 times larger than those required from low-power germicidal lamps, indicating that high-intensity radiation is able to further promote into inactive channels the lower excited state(s) of nucleic acids responsible for DNA damage. The present study confirms the existence of a significant trade-off between photon efficiency and radiative power in bacterial disinfection by UV light.

Item Type:Article
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Colussi, A. J.0000-0002-3400-4101
Hoffmann, M. R.0000-0001-6495-1946
Additional Information:© 2003 American Chemical Society. Received for review February 27, 2003. Revised manuscript received August 7, 2003. Accepted August 11, 2003.
Issue or Number:21
Record Number:CaltechAUTHORS:20150623-154756602
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Official Citation:Soluble Sunscreens Fully Protect E. coli from Disinfection by Electrohydraulic Discharges W.-K. Ching, A. J. Colussi, and M. R. Hoffmann Environmental Science & Technology 2003 37 (21), 4901-4904 DOI: 10.1021/es034182j
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58479
Deposited By: George Porter
Deposited On:28 Jul 2015 20:48
Last Modified:10 Nov 2021 22:05

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