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Transient photothermal inactivation of Escherichia coli stained with visible dyes by using a nanosecond pulsed laser.

Abstract：

:Efficient inactivation of Escherichia coli (E. coli) under visible (532 nm) pulsed light irradiation was achieved by fusion of a visible light-absorbing dye with E. coli. Inactivation experiments showed that 3-log inactivation of E. coli was obtained within 20 min under a 50 kJ/cm2 dose. This treatment time and dose magnitude were 10 times faster and 100 times lower, respectively, than the values previously obtained by using a visible femtosecond laser. The mechanism of bacterial death was modeled based on a transient photothermal evaporation effect, where a quantitative evaluation of the temperature increase was given based on the heat transfer equation. As a result of this theoretical analysis, the maximum temperature of the bacteria was correlated with the absorption ratio, pulse energy, and surface-to-volume ratio. An increase in the surface-to-volume ratio with the decreasing size of organic structures leads to the possibility of efficient inactivation of viruses and bacteria under low-dose and non-harmful-visible pulsed light irradiation. Hence, this method can be applied in many fields, such as the instantaneous inactivation of pathogenic viruses and bacteria in a safe and simple manner without damaging large organic structures.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kohmura Y,Igami N,Tatsuno I,Hasegawa T,Matsumoto T

doi

10.1038/s41598-020-74714-5

subject

Has Abstract

pub_date

2020-10-20 00:00:00

pages

17805

issue

1

issn

2045-2322

pii

10.1038/s41598-020-74714-5

journal_volume

10

pub_type

杂志文章

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