Edna de Morais Garcez, Alessandra Baptista, Michael R Hamblin, Selly S Suzuki, Aguinaldo Garcez, Silvia Cristina Nunez, Ricardo S Navarro, Thamiris Bassoto, Aguinaldo Silva Garcez
{"title":"Effects of transcranial photobiomodulation on fine motor skills in boccia para-athletes.","authors":"Edna de Morais Garcez, Alessandra Baptista, Michael R Hamblin, Selly S Suzuki, Aguinaldo Garcez, Silvia Cristina Nunez, Ricardo S Navarro, Thamiris Bassoto, Aguinaldo Silva Garcez","doi":"10.1111/php.14060","DOIUrl":"https://doi.org/10.1111/php.14060","url":null,"abstract":"<p><p>This study investigated the effects of transcranial photobiomodulation (t-PBM) on para-athletes' manual dexterity and intralimbal coordination. Six para-athletes from a Boccia Team participated. t-PBM was administered using a LED helmet with 204 LEDs (660 and 850 nm) emitting 10 mW each, delivering 9 J/cm<sup>2</sup> per LED during 15-min sessions three times a week. The trial lasted 2 weeks, with baseline, placebo treatment, and post-treatment assessments. Manual dexterity was measured by Box and Ball Test (BBLT), and intralimbal coordination by discrete and continuous horizontal and vertical touch tests. Results showed significant improvements in manual dexterity for the t-PBM group compared to the placebo. Discrete vertical touch tests showed reduced time to perform movements, and continuous vertical touch tests showed increased movement frequency in the t-PBM group. No significant improvements were observed in the placebo group. t-PBM was shown to be a potentially effective treatment, with significant benefits in fine motor skills.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Megumi Nishitani Yukuyama, Karen Campos Fabiano, Alex Inague, Miriam Uemi, Rodrigo Santiago Lima, Larissa Regina Diniz, Tiago Eugenio Oliveira, Thais Satie Iijima, Hector Oreliana Fernandes Faria, Rosangela Silva Santos, Maria Fernanda Valente Nolf, Adriano Brito Chaves-Filho, Marcos Yukio Yoshinaga, Helena Couto Junqueira, Paolo Di Mascio, Mauricio da Silva Baptista, Sayuri Miyamoto
{"title":"Comparative study of ergosterol and 7-dehydrocholesterol and their endoperoxides: Generation, identification, and impact in phospholipid membranes and melanoma cells.","authors":"Megumi Nishitani Yukuyama, Karen Campos Fabiano, Alex Inague, Miriam Uemi, Rodrigo Santiago Lima, Larissa Regina Diniz, Tiago Eugenio Oliveira, Thais Satie Iijima, Hector Oreliana Fernandes Faria, Rosangela Silva Santos, Maria Fernanda Valente Nolf, Adriano Brito Chaves-Filho, Marcos Yukio Yoshinaga, Helena Couto Junqueira, Paolo Di Mascio, Mauricio da Silva Baptista, Sayuri Miyamoto","doi":"10.1111/php.14059","DOIUrl":"https://doi.org/10.1111/php.14059","url":null,"abstract":"<p><p>Melanoma is an aggressive cancer that has attracted attention in recent years due to its high mortality rate of 80%. Damage caused by oxidative stress generated by radical (type I reaction) and singlet oxygen, <sup>1</sup>O<sub>2</sub> (type II reaction) oxidative reactions may induce cancer. Thus, studies that aim to unveil the mechanism that drives these oxidative damage processes become relevant. Ergosterol, an analogue of 7-dehydrocholesterol, important in the structure of cell membranes, is widely explored in cancer treatment. However, to date little is known about the impact of different oxidative reactions on these sterols in melanoma treatment, and conflicting results about their effectiveness complicates the understanding of their role in oxidative damage. Our results highlight differences among ergosterol, 7-dehydrocholesterol (7-DHC), and cholesterol in membrane properties when subjected to distinct oxidative reactions. Furthermore, we conducted a comparative study exploring the mechanisms of cell damage by photodynamic treatment in A375 melanoma. Notably, endoperoxides from ergosterol and 7-DHC generated by <sup>1</sup>O<sub>2</sub> showed superior efficacy in reducing the viability of A375 cells compared to their precursor molecules. We also describe a step-by-step process to produce and identify endoperoxides derived from ergosterol and 7-DHC. While further studies are needed, this work provides new insights for understanding cancer cell death induced by different oxidative reactions in the presence of biologically relevant sterols.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hongjing Sun, Michele M Kim, Yi Hong Ong, Andreea Dimofte, Sunil Singhal, Theresa M Busch, Keith A Cengel, Timothy C Zhu
{"title":"Comprehensive reanalysis of light fluence distribution in pleural photodynamic therapy using standardized anatomical coordinates.","authors":"Hongjing Sun, Michele M Kim, Yi Hong Ong, Andreea Dimofte, Sunil Singhal, Theresa M Busch, Keith A Cengel, Timothy C Zhu","doi":"10.1111/php.14063","DOIUrl":"https://doi.org/10.1111/php.14063","url":null,"abstract":"<p><p>Photodynamic therapy (PDT) has shown promise as an adjuvant treatment for malignant pleural mesothelioma when combined with surgical resection. Accurate light dosimetry is critical for treatment efficacy. This study presents an improved method for analyzing light fluence distribution in pleural PDT using a standardized anatomical coordinate system and advanced computational modeling. We utilized an infrared navigation system with an improved treatment delivery wand to track light delivery in real-time. The human chest cavity geometry was reconstructed and the pleura was mapped to a standardized coordinate system, allowing for direct comparisons across patients. Light fluence was calculated using both primary and scattered components, with a novel dual correction method applied to match measured values at detector locations. The standardized approach allowed for statistical analysis of light fluence distribution across anatomical regions in a cohort of 11 patients. Results showed acceptable light fluence uniformity with a standard deviation of 6.6% from the prescribed dose across patients. This comprehensive analysis provides insights for optimizing treatment protocols and lays the groundwork for future studies on singlet oxygen generation and its correlation with treatment outcomes in pleural PDT.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marcílio Coelho Ferreira, Diego Mendes Xavier, Giovanna Moura Della Santa Lamas, Samara Maria Neves Barbosa, Sheyla Gabrielle Alves Ferreira, Thaís Peixoto Gaiad, Ana Paula Santos, Murilo Xavier Oliveira
{"title":"Effects of photobiomodulation therapy (660-nm laser) on median nerve function in Wistar rats.","authors":"Marcílio Coelho Ferreira, Diego Mendes Xavier, Giovanna Moura Della Santa Lamas, Samara Maria Neves Barbosa, Sheyla Gabrielle Alves Ferreira, Thaís Peixoto Gaiad, Ana Paula Santos, Murilo Xavier Oliveira","doi":"10.1111/php.14067","DOIUrl":"https://doi.org/10.1111/php.14067","url":null,"abstract":"<p><p>This study investigates the effects of photobiomodulation (PBM) with a 660-nm laser on nerve regeneration and muscle morphometry following median nerve axonotmesis in rats. Sixteen Wistar rats were divided into a control group and laser-treated group, with the latter receiving 10 applications of PBM (660 nm; 20 mW; 10 J/cm<sup>2</sup>; 0.4 J; and 20 s) over 2 weeks. Functional analysis was performed using the grasping test, which measures the grip strength of the forelimb digits to evaluate motor function of the median nerve. Morphometric analyses were conducted on the median nerve, flexor digitorum (FD) muscle, and flexor carpi radialis (FCR) muscle. PBM led to functional improvement, with significant differences observed on the 21st day post-injury. However, no significant differences between groups were found in nerve morphometry. Morphometric analysis of the FD muscle revealed significant improvements in the PBM group, but with no significant differences regarding the FCR muscle. These findings suggest that 660-nm laser with the parameters used produced functional improvement as well as significant improvements in the morphometry of the FD muscle, but did not have significant effects on the morphometry of the FCR muscle or nerve regeneration.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Roberto Tomás, Gabriela Di Venosa, Daniel Sáenz, Fernanda Buzzola, Leandro Mamone, Adriana Casas
{"title":"Boosting porphyrin synthesis and ALA-mediated photoinactivation through near-infrared therapy.","authors":"Roberto Tomás, Gabriela Di Venosa, Daniel Sáenz, Fernanda Buzzola, Leandro Mamone, Adriana Casas","doi":"10.1111/php.14056","DOIUrl":"https://doi.org/10.1111/php.14056","url":null,"abstract":"<p><p>Photodynamic inactivation (PDI) combines the use of photosensitizers with visible light to produce reactive oxygen species that effectively eliminate pathogens. To investigate the impact of near- infrared therapy (NIRT) on heme biosynthesis and permeability of the pro-photosensitizers 5-aminolevulinic acid (ALA) and Hexyl-ALA (H-ALA) through biofilms, we applied sub-lethal conditions for both NIRT and PDI to maintain intact bacterial viability. During NIRT, the temperature remained below 37°C, permitting rapid heating (ΔT = 11°C) without causing thermal damage. NIRT potentiated the bactericidal effects of ALA-PDI by 3 logs in Staphylococcus aureus RN6390 biofilms and 4 logs in ST5-SCCmecI biofilms. With H-ALA-PDI, reductions of 4 and 6 logs, respectively, were observed. In the case of ALA, this enhancement was partly due to increased porphyrin synthesis, a result not replicated by simple heating. For H-ALA, the enhanced effect of PDI was likely due to biofilm or bacterial membrane destabilization caused by NIRT and H-ALA. Unlike biofilms, applying the same ALA-PDI conditions, the treatment was effective in planktonic S. aureus RN6390 cultures, reducing the bacteria by 3 logs, with no additional benefit from NIRT, suggesting that NIRT primarily aids in penetrating the biofilm matrix rather than the bacterial cells. Confocal fluorescence microscopy confirmed that NIRT-treated biofilms exposed to ALA exhibited higher porphyrin fluorescence than untreated biofilms. These findings support the use of NIRT in enhancing the effectiveness of PDI against bacterial biofilms.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Whitney Querini-Sanguillén, Jennifer Otero-González, Melannie García-Sánchez, Daniel Zúñiga-Núñez, Germán Günther, Mario L Miranda, Edgardo Castro-Pérez, Carlos Ramos, Denis Fuentealba, José Robinson-Duggon
{"title":"Toluidine blue O demethylated photoproducts as type II photosensitizers.","authors":"Whitney Querini-Sanguillén, Jennifer Otero-González, Melannie García-Sánchez, Daniel Zúñiga-Núñez, Germán Günther, Mario L Miranda, Edgardo Castro-Pérez, Carlos Ramos, Denis Fuentealba, José Robinson-Duggon","doi":"10.1111/php.14066","DOIUrl":"https://doi.org/10.1111/php.14066","url":null,"abstract":"<p><p>Toluidine blue O (TBO) is a type I-type II photosensitizer that has shown good efficacy and selectivity in antimicrobial and anticancer photodynamic therapy applications. However, its complex photochemistry with multiple photoproducts hinders its application as a photosensitizer. We have previously described the mechanism for photooxidative demethylation of TBO which in acetonitrile yields two main products: demethylated-TBO (d-TBO) and double-demethylated-TBO (dd-TBO). In the current work, we describe the photophysical properties of these two photoproducts. In acetonitrile and phosphate buffer, demethylation induces an hypsochromic shift in the absorption and fluorescence emission maxima. Fluorescence quantum yields increase slightly for the demethylated photoproducts, in agreement with the lengthening of the fluorescence lifetimes. Triplet excited states lifetimes in the presence of oxygen decreased slightly upon demethylation. However, the singlet oxygen quantum yield increased significantly reaching unity for the dd-TBO photoproduct. These results are interpreted in terms of the competing pathways of TBO photochemistry. For TBO, demethylation is the main pathway for deactivation of the excited state, while for d-TBO, demethylation and singlet oxygen generation are significant. For dd-TBO, singlet oxygen generation is the main deactivation pathway. Overall, TBO demethylated photoproducts demonstrate good potential as candidates for photodynamic therapy applications.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pavel A Tarakanov, Alexei V Kozlov, Anton O Simakov, Nikolay S Goryachev, Victor E Pushkarev
{"title":"Breakdown of the Kasha-Vavilov's rule in low-symmetry porphyrazines: Ultrafast intersystem crossing via high vibronic state.","authors":"Pavel A Tarakanov, Alexei V Kozlov, Anton O Simakov, Nikolay S Goryachev, Victor E Pushkarev","doi":"10.1111/php.14064","DOIUrl":"https://doi.org/10.1111/php.14064","url":null,"abstract":"<p><p>Recently (Photochem Photobiol. 2023;100:1277-1289. doi:10.1111/php.13898), we described the anti-Kasha effect in tribenzo-6H-1,4-diazepinoporphyrazins with C<sub>2v</sub> symmetry, where the ultrafast spin changes successfully compete with the internal conversion. In this study, we show the presence of this effect in 2 (3),9 (10),16(17),23(24)-tetra-tert-butyl-29H,31H-phthalocyanine (1) and 1,4-di-[2-(2-methoxyethoxy)ethoxy]-29H,31H-phthalocyanine (2), which also possess reduced molecular symmetry and do not bear 6H-1,4-diazepine fragments. The anti-Kasha effect in 1 and 2 supplemented by Mg(II) tribenzo-6H-1,4-diazepinoporphyrazinates 3 and 4 exhibits a close-to-linear dependence on energy gap value between the zero vibrational levels of two lowest singlet excited states S<sub>1</sub> <sup>0</sup> and S<sub>2</sub> <sup>0</sup> (these states are degenerate in D<sub>4h</sub> symmetry) and enhances with increase. The theoretical kinetic model of excited state dynamics, which takes into account the observed effects and follows Fermi's golden rule, predicts the presence of an additional excited state with enhanced spin-orbit coupling compared to S<sub>1</sub> <sup>0</sup>, S<sub>2</sub> <sup>0</sup> and the corresponding triplet states, which is not predicted by TDDFT calculations in the Born-Oppenheimer approximation. The combination of the above indicates that the key role in the observed anti-Kasha effect and the mechanism of dissipation of the excited state in porphyrazines and their analogs is played by vibronic excited states, which requires theoretical research methods beyond the Born-Oppenheimer approximation.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Victória Regina da Silva Oliveira, Inaeh de Paula Oliveira, Heloísa Alonso-Matielo, Victhor Teixeira Oliveira, Jean Lucas Kremer, Milena Cristina Dias Casalverini, Fernando Quadros Ribeiro, Silvya Stuchi Maria-Engler, Silvia Romano Assis, Manoel Jacobsen Teixeira, Claudimara Ferini Pacicco Lotfi, José Pinhata Otoch, Camila Squarzoni Dale
{"title":"Photobiomodulation therapy in diabetes: Benefits for pain relief, quality of life, and wound healing.","authors":"Victória Regina da Silva Oliveira, Inaeh de Paula Oliveira, Heloísa Alonso-Matielo, Victhor Teixeira Oliveira, Jean Lucas Kremer, Milena Cristina Dias Casalverini, Fernando Quadros Ribeiro, Silvya Stuchi Maria-Engler, Silvia Romano Assis, Manoel Jacobsen Teixeira, Claudimara Ferini Pacicco Lotfi, José Pinhata Otoch, Camila Squarzoni Dale","doi":"10.1111/php.14053","DOIUrl":"https://doi.org/10.1111/php.14053","url":null,"abstract":"<p><p>Globally, 537 million people suffer from diabetes mellitus (DM), a condition often associated with sensory disturbances, wound development, and chronic pain, which significantly affects the quality of life and imposes a substantial economic burden. This study evaluated the effects of photobiomodulation (PBM) therapy on nociceptive and sensory changes in diabetic patients to understand pain manifestations and explore PBM's molecular mechanisms on wound healing. Twenty patients with type 2 DM underwent clinical assessments, completed pain and quality of life questionnaires, and had their pain sensitivity evaluated using the quantitative sensory test (QST). A 5 mm skin biopsy was taken for fibroblast culture. PBM therapy, using 660 nm red light, was administered twice weekly for 7 weeks on lower limb wounds. Results indicated that DM patients faced significant sensory impairments, impacting their quality of life. PBM therapy improved pain scores, alleviated neuropathic pain, and enhanced sensory function, leading to better quality of life and reduced anxiety and depression. It also accelerated wound healing, enhancing mobility and autonomy. In vitro studies showed PBM therapy increased cell proliferation through the ERK signaling pathway and modulation of matrix metalloproteinases (MMP-1/8 and 2) and tissue inhibitors of metalloproteinases (TIMP).</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparative study of inactivation efficacy of far-UVC (222 nm) and germicidal UVC (254 nm) radiation against virus-laden aerosols of artificial human saliva.","authors":"Monika, Eeshan Ajay Damle, Kiran Kondabagil, Ambarish Kunwar","doi":"10.1111/php.14062","DOIUrl":"https://doi.org/10.1111/php.14062","url":null,"abstract":"<p><p>Virus-laden aerosols play a substantial role in the spread of numerous infectious diseases, particularly in enclosed indoor settings. Ultraviolet-C (UVC) disinfection is known to be a highly efficient method for disinfecting pathogenic airborne viruses. Recent recommendations suggest using far-UVC radiation (222 nm) emitted by KrCl* (krypton-chloride) excimer lamps to disinfect high-risk public spaces due to lower exposure risks than low-pressure (LP) mercury lamps (254 nm). This study experimentally explored the comparative effectiveness of far-UVC (222 nm) and germicidal UVC (254 nm) in inactivating virus-laden aerosols of different protective vector media in an air disinfection chamber. The UVC inactivation performances of individual filtered KrCl* excimer lamp and LP mercury lamp were determined for inactivating the bacteriophages, MS2 (icosahedral and non-enveloped ssRNA virus) and Phi6 (spherical and enveloped dsRNA virus) aerosolized from artificial human saliva or sodium chloride and magnesium sulfate (SM) buffer as a vector media. Disinfection efficacy of filtered KrCl* excimer lamp (222 nm) and LP mercury lamp (254 nm) were evaluated for highly concentrated viral aerosols, which replicate those exhaled from infected individuals and remain suspended in air or deposited on surfaces as fomites. Our results show that using individual filtered KrCl* excimer lamp (222 nm) and LP mercury lamp (254 nm) could greatly accelerate the inactivation of the viral bioaerosols formed from artificial human saliva and SM buffer. In the case of 222 nm exposure, Phi6 exhibited significantly more susceptibility in artificial human saliva than in SM buffer whereas MS2 showed comparable vulnerability in both artificial human saliva and SM buffer. However, in the case of 254 nm exposure, both Phi6 and MS2 demonstrated significantly greater susceptibility in artificial human saliva than in SM buffer. This study offers valuable insights and improves our understanding of the influence of different vector media on UVC disinfection of exhaled virus-laden aerosols in indoor environments. These findings can guide the deployment of UVC devices which could greatly contribute to mitigating the transmission of exhaled bioaerosols in public settings.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143009790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Far-UVC (222 nm) irradiation effectively inactivates ssRNA, dsRNA, ssDNA, and dsDNA viruses as compared to germicidal UVC (254 nm).","authors":"Monika, Santhosh Kumar Madugula, Kiran Kondabagil, Ambarish Kunwar","doi":"10.1111/php.13961","DOIUrl":"10.1111/php.13961","url":null,"abstract":"<p><p>Ultraviolet-C (UVC) irradiation is being used as an effective approach for the disinfection of pathogenic viruses present in air, surfaces, and water. Recently, far-UVC radiation (222 nm) emitted by KrCl* (krypton-chloride) excimer lamps have been recommended for disinfecting high-risk public spaces to reduce the presence and transmission of infectious viruses owing to limited human health exposure risks as compared to germicidal UVC (254 nm). In this study, the UVC inactivation performances of individual filtered KrCl* excimer lamp (222 nm) and germicidal UVC lamp (254 nm) were determined against four viruses, bacteriophages MS2, Phi6, M13, and T4, having different genome compositions (ssRNA, dsRNA, ssDNA and dsDNA, respectively) and shapes (i.e., spherical (Phi6), linear (M13), and icosahedral (MS2 and T4)). Here, the disinfection efficacies of filtered KrCl* excimer lamp (222 nm) and germicidal UVC lamp (254 nm) were evaluated for highly concentrated virus droplets that mimic the virus-laden droplets released from the infected person and deposited on surfaces as fomites. Filtered KrCl* excimer (222 nm) showed significantly better inactivation against all viruses having different genome compositions and structures compared to germicidal UVC (254 nm). The obtained sensitivity against the filtered KrCl* excimer (222 nm) was found to be in the order, T4 > M13 > Phi6 > MS2 whereas for the germicidal UVC (254 nm) it was T4 > M13 > MS2 > Phi6. These results provide a strong basis to promote the use of filtered KrCl* excimer lamps (222 nm) in disinfecting contagious viruses and to limit the associated disease spread in public places and other high-risk areas.</p>","PeriodicalId":20133,"journal":{"name":"Photochemistry and Photobiology","volume":" ","pages":"147-156"},"PeriodicalIF":2.6,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140912443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}