405 ± 5 nm light emitting diode illumination causes photodynamic inactivation of Salmonella spp. on fresh-cut papaya without deterioration

2017 ◽  
Vol 62 ◽  
pp. 124-132 ◽  
Author(s):  
Min-Jeong Kim ◽  
Woo Suk Bang ◽  
Hyun-Gyun Yuk
Keyword(s):  
Light Emitting Diode ◽  
Photodynamic Inactivation ◽  
Salmonella Spp ◽  
Light Emitting ◽  
Fresh Cut

Effect of 460 nm light emitting diode illumination on survival of Salmonella spp. on fresh-cut pineapples at different irradiances and temperatures

2017 ◽  
Vol 196 ◽  
pp. 130-138 ◽  
Author(s):  
Vinayak Ghate ◽  
Amit Kumar ◽  
Min-Jeong Kim ◽  
Woo-Suk Bang ◽  
Weibiao Zhou ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Salmonella Spp ◽  
Light Emitting ◽  
Fresh Cut

scholarly journals A Comparison of Porphyrin Photosensitizers in Photodynamic Inactivation of RNA and DNA Bacteriophages

Viruses ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 530
Author(s):  
Joe Heffron ◽  
Matthew Bork ◽  
Brooke K. Mayer ◽  
Troy Skwor
Keyword(s):  
Light Emitting Diode ◽  
Photodynamic Inactivation ◽  
Oxygen Species ◽  
Resistant Virus ◽  
Human Virus ◽  
Light Emitting ◽  
Porphyrin Photosensitizers ◽  
Therapeutic Alternatives ◽  
Palladium Ion ◽  
Rna And Dna

Effective broad-spectrum antiviral treatments are in dire need as disinfectants and therapeutic alternatives. One such method of disinfection is photodynamic inactivation, which involves the production of reactive oxygen species from dissolved oxygen in response to light-stimulated photosensitizers. This study evaluated the efficacy of functionalized porphyrin compounds for photodynamic inactivation of bacteriophages as human virus surrogates. A blue-light light emitting diode (LED) lamp was used to activate porphyrin compounds in aqueous solution (phosphate buffer). The DNA bacteriophages ΦX174 and P22 were more resistant to porphyrin TMPyP photodynamic inactivation than RNA bacteriophage fr, with increasing rates of inactivation in the order: ΦX174 << P22 << fr. Bacteriophage ΦX174 was therefore considered a resistant virus suitable for the evaluation of three additional porphyrins. These porphyrins were synthesized from TMPyP by inclusion of a central palladium ion (PdT4) and/or the addition of a hydrophobic C14 chain (PdC14 or C14). While the inactivation rate of bacteriophage ΦX174 via TMPyP was similar to previous reports of resistant viruses, ΦX174 inactivation increased by a factor of approximately 2.5 using the metalloporphyrins PdT4 and PdC14. The order of porphyrin effectiveness was TMPyP < C14 < PdT4 < PdC14, indicating that both Pd2+ ligation and C14 functionalization aided virus inactivation.

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