Small but powerful: Light-emitting diodes for inactivation of Aspergillus species in real water matrices

Beatriz Reis Oliveira; M. T. Barreto Crespo; V. J. Pereira

doi:10.1016/j.watres.2019.115108

Small but powerful: Light-emitting diodes for inactivation of Aspergillus species in real water matrices

Beatriz Reis Oliveira, M. T. Barreto Crespo, V. J. Pereira

Instituto de Tecnologia Química e Biológica António Xavier (ITQB)

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

This study addressed the effectiveness of light emitting diodes to achieve inactivation of three different Aspergillus species (Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus) in a real water matrix. Three single small ultraviolet-C diodes emitting light at two different wavelengths were tested: 255 nm that is similar to the wavelength emitted by low pressure mercury lamps and 265 nm that is closer to the maximum absorbance wavelength of DNA. The ultraviolet-C diodes emitting light at 265 nm were found to be more effective than the 255 nm, achieving 3-log, 1-log and 5-log inactivations of Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus using less than 20 mJ/cm² (13,97 mJ/cm²; 7,28 mJ/cm²; 19,74 mJ/cm²). The diodes have also affected the morphology of the fungal spores and increased the percentage of damaged and dead spores.

Original language	English
Article number	115108
Journal	Water Research
Volume	168
DOIs	https://doi.org/10.1016/j.watres.2019.115108
Publication status	Published - 1 Jan 2020

Keywords

Aspergillus species
Disinfection
Enzymatic activity
Light emitting diodes
Membrane permeability
Spores morphology

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10.1016/j.watres.2019.115108Licence: CC BY-NC-ND

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title = "Small but powerful: Light-emitting diodes for inactivation of Aspergillus species in real water matrices",

abstract = "This study addressed the effectiveness of light emitting diodes to achieve inactivation of three different Aspergillus species (Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus) in a real water matrix. Three single small ultraviolet-C diodes emitting light at two different wavelengths were tested: 255 nm that is similar to the wavelength emitted by low pressure mercury lamps and 265 nm that is closer to the maximum absorbance wavelength of DNA. The ultraviolet-C diodes emitting light at 265 nm were found to be more effective than the 255 nm, achieving 3-log, 1-log and 5-log inactivations of Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus using less than 20 mJ/cm2 (13,97 mJ/cm2; 7,28 mJ/cm2; 19,74 mJ/cm2). The diodes have also affected the morphology of the fungal spores and increased the percentage of damaged and dead spores.",

keywords = "Aspergillus species, Disinfection, Enzymatic activity, Light emitting diodes, Membrane permeability, Spores morphology",

author = "Oliveira, {Beatriz Reis} and {Barreto Crespo}, {M. T.} and Pereira, {V. J.}",

year = "2020",

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doi = "10.1016/j.watres.2019.115108",

language = "English",

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AU - Oliveira, Beatriz Reis

AU - Barreto Crespo, M. T.

AU - Pereira, V. J.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - This study addressed the effectiveness of light emitting diodes to achieve inactivation of three different Aspergillus species (Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus) in a real water matrix. Three single small ultraviolet-C diodes emitting light at two different wavelengths were tested: 255 nm that is similar to the wavelength emitted by low pressure mercury lamps and 265 nm that is closer to the maximum absorbance wavelength of DNA. The ultraviolet-C diodes emitting light at 265 nm were found to be more effective than the 255 nm, achieving 3-log, 1-log and 5-log inactivations of Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus using less than 20 mJ/cm2 (13,97 mJ/cm2; 7,28 mJ/cm2; 19,74 mJ/cm2). The diodes have also affected the morphology of the fungal spores and increased the percentage of damaged and dead spores.

AB - This study addressed the effectiveness of light emitting diodes to achieve inactivation of three different Aspergillus species (Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus) in a real water matrix. Three single small ultraviolet-C diodes emitting light at two different wavelengths were tested: 255 nm that is similar to the wavelength emitted by low pressure mercury lamps and 265 nm that is closer to the maximum absorbance wavelength of DNA. The ultraviolet-C diodes emitting light at 265 nm were found to be more effective than the 255 nm, achieving 3-log, 1-log and 5-log inactivations of Aspergillus fumigatus, Aspergillus niger and Aspergillus terreus using less than 20 mJ/cm2 (13,97 mJ/cm2; 7,28 mJ/cm2; 19,74 mJ/cm2). The diodes have also affected the morphology of the fungal spores and increased the percentage of damaged and dead spores.

KW - Aspergillus species

KW - Disinfection

KW - Enzymatic activity

KW - Light emitting diodes

KW - Membrane permeability

KW - Spores morphology

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JO - Water Research

JF - Water Research

SN - 0043-1354

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ER -

Small but powerful: Light-emitting diodes for inactivation of Aspergillus species in real water matrices

Abstract

Keywords

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