Microorganisms Photocatalytic Inactivation on Ag3PO4 Sub-Microcrystals Under WLEDs Light Source

In this article, we report the silver orthophosphate (Ag 3 PO 4 ) photocatalytic inactivation properties on strains Gram-positive Saprophyte B. subtilis , a diploid fungus Candida albicans and Gram-negative Pseudomonas aeruginosa , using as irradiation source white-light-emitting diodes (WLEDs) with...

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Bibliographic Details
Published in:Journal of inorganic and organometallic polymers and materials 2021-05, Vol.31 (5), p.2233-2241
Main Authors: Cruz-Filho, J. F., Costa, T. M. S., Lima, M. S., Nolêto, L. F. G., Bandeira, Carla C. S., Lima, F. L., Luz, G. E.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Deactivation
Field emission microscopy
Inorganic Chemistry
Irradiation
Light emitting diodes
Light sources
Lipids
Lumens
Microcrystals
Microorganisms
Organic Chemistry
Oxidation
Phosphates
Photocatalysis
Photomicrographs
Polymer Sciences
Pseudomonas aeruginosa
Rupture
Silver compounds
White light
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Summary:In this article, we report the silver orthophosphate (Ag 3 PO 4 ) photocatalytic inactivation properties on strains Gram-positive Saprophyte B. subtilis , a diploid fungus Candida albicans and Gram-negative Pseudomonas aeruginosa , using as irradiation source white-light-emitting diodes (WLEDs) with luminous flux (Φ v) of 1.3 × 10 3 Lumens and relative power density of 15 mW m −2 . Microorganisms death curves and the kinetic constants (K d ) indicated that the inhibitory effect of the Ag 3 PO 4 under WLEDs irradiation is well pronounced to C. albicans (6.6 × 10 –2  min −1 ) in relation to P. augenosas (4.6 × 10 –2  min −1 ) and B. subitilis (2.5 × 10 –2  min −1 ). Decimal reduction time ( D t ) were 34.4 min to C. albicans , 50.1 min P. augenosas and 92.1 min to B.subitilis . The micrographs obtained by scanning electron microscopy with field emission gun (SEM-FEG) demonstrated that there was cell wall permeability and consequently total rupture in the C. albicans , suggesting the lipid peroxidation phenomenon and protein oxidation promoted by the presence of reactive oxygen species (ROS). Furthermore, it was observed the A g3 PO 4 when irradiated by WLEDs demonstrates important sporicidal activity in related to B. subtilis , promoting the endospore wall rupture.
ISSN:1574-1443
1574-1451
DOI:10.1007/s10904-021-01930-5