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Prasad A, Wynands E, Roche SM, Romo-Bernal C, Allan N, Olson M, Levengood S, Andersen R, Loebel N, Sabino CP, Ross JA. Photodynamic Inactivation of Foodborne Bacteria: Screening of 32 Potential Photosensitizers. Foods 2024; 13:453. [PMID: 38338588 PMCID: PMC10855769 DOI: 10.3390/foods13030453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/22/2024] [Accepted: 01/29/2024] [Indexed: 02/12/2024] Open
Abstract
The development of novel antimicrobial technologies for the food industry represents an important strategy to improve food safety. Antimicrobial photodynamic disinfection (aPDD) is a method that can inactivate microbes without the use of harsh chemicals. aPDD involves the administration of a non-toxic, light-sensitive substance, known as a photosensitizer, followed by exposure to visible light at a specific wavelength. The objective of this study was to screen the antimicrobial photodynamic efficacy of 32 food-safe pigments tested as candidate photosensitizers (PSs) against pathogenic and food-spoilage bacterial suspensions as well as biofilms grown on relevant food contact surfaces. This screening evaluated the minimum bactericidal concentration (MBC), minimum biofilm eradication concentration (MBEC), and colony forming unit (CFU) reduction against Salmonella enterica, methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas fragi, and Brochothrix thermosphacta. Based on multiple characteristics, including solubility and the ability to reduce the biofilms by at least 3 log10 CFU/sample, 4 out of the 32 PSs were selected for further optimization against S. enterica and MRSA, including sunset yellow, curcumin, riboflavin-5'-phosphate (R-5-P), and erythrosin B. Optimized factors included the PS concentration, irradiance, and time of light exposure. Finally, 0.1% w/v R-5-P, irradiated with a 445 nm LED at 55.5 J/cm2, yielded a "max kill" (upwards of 3 to 7 log10 CFU/sample) against S. enterica and MRSA biofilms grown on metallic food contact surfaces, proving its potential for industrial applications. Overall, the aPDD method shows substantial promise as an alternative to existing disinfection technologies used in the food processing industry.
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Affiliation(s)
- Amritha Prasad
- Chinook Contract Research Inc., Airdrie, AB T4A 0C3, Canada; (A.P.); (N.A.); (M.O.)
| | - Erin Wynands
- ACER Consulting, Guelph, ON N1G 5L3, Canada; (E.W.); (S.M.R.)
| | - Steven M. Roche
- ACER Consulting, Guelph, ON N1G 5L3, Canada; (E.W.); (S.M.R.)
| | - Cristina Romo-Bernal
- Ondine Biomedical Inc., Bothell, WA 98011, USA; (C.R.-B.); (S.L.); (R.A.); (N.L.); (C.P.S.)
| | - Nicholas Allan
- Chinook Contract Research Inc., Airdrie, AB T4A 0C3, Canada; (A.P.); (N.A.); (M.O.)
| | - Merle Olson
- Chinook Contract Research Inc., Airdrie, AB T4A 0C3, Canada; (A.P.); (N.A.); (M.O.)
| | - Sheeny Levengood
- Ondine Biomedical Inc., Bothell, WA 98011, USA; (C.R.-B.); (S.L.); (R.A.); (N.L.); (C.P.S.)
| | - Roger Andersen
- Ondine Biomedical Inc., Bothell, WA 98011, USA; (C.R.-B.); (S.L.); (R.A.); (N.L.); (C.P.S.)
| | - Nicolas Loebel
- Ondine Biomedical Inc., Bothell, WA 98011, USA; (C.R.-B.); (S.L.); (R.A.); (N.L.); (C.P.S.)
| | - Caetano P. Sabino
- Ondine Biomedical Inc., Bothell, WA 98011, USA; (C.R.-B.); (S.L.); (R.A.); (N.L.); (C.P.S.)
- Center for Lasers and Applications, Energy and Nuclear Research Institute, São Paulo 05508-000, SP, Brazil
| | - Joseph A. Ross
- Chinook Contract Research Inc., Airdrie, AB T4A 0C3, Canada; (A.P.); (N.A.); (M.O.)
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Minor M, Sabillón L. Effectiveness of Ultra-High Irradiance Blue-Light-Emitting Diodes to Control Salmonella Contamination Adhered to Dry Stainless Steel Surfaces. Microorganisms 2024; 12:103. [PMID: 38257930 PMCID: PMC10819507 DOI: 10.3390/microorganisms12010103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/01/2024] [Accepted: 01/03/2024] [Indexed: 01/24/2024] Open
Abstract
Controlling Salmonella contamination in dry food processing environments represents a significant challenge due to their tolerance to desiccation stress and enhanced thermal resistance. Blue light is emerging as a safer alternative to UV irradiation for surface decontamination. In the present study, the antimicrobial efficacy of ultra-high irradiance (UHI) blue light, generated by light-emitting diodes (LEDs) at wavelengths of 405 nm (841.6 mW/cm2) and 460 nm (614.9 mW/cm2), was evaluated against a five-serovar cocktail of Salmonella enterica dry cells on clean and soiled stainless steel (SS) surfaces. Inoculated coupons were subjected to blue light irradiation treatments at equivalent energy doses ranging from 221 to 1106 J/cm2. Wheat flour was used as a model food soil system. To determine the bactericidal mechanisms of blue light, the intracellular concentration of reactive oxygen species (ROS) in Salmonella cells and the temperature changes on SS surfaces were also measured. The treatment energy dose had a significant effect on Salmonella inactivation levels. On clean SS surfaces, the reduction in Salmonella counts ranged from 0.8 to 7.4 log CFU/cm2, while, on soiled coupons, the inactivation levels varied from 1.2 to 4.2 log CFU/cm2. Blue LED treatments triggered a significant generation of ROS within Salmonella cells, as well as a substantial temperature increase in SS surfaces. However, in the presence of organic matter, the oxidative stress in Salmonella cells declined significantly, and treatments with higher energy doses (>700 J/cm2) were required to uphold the antimicrobial effectiveness observed on clean SS. The mechanism of the bactericidal effect of UHI blue LED treatments is likely to be a combination of photothermal and photochemical effects. These results indicate that LEDs emitting UHI blue light could represent a novel cost- and time-effective alternative for controlling microbial contamination in dry food processing environments.
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Affiliation(s)
- Martha Minor
- Department of Family & Consumer Sciences, New Mexico State University, Las Cruces, NM 88003, USA
| | - Luis Sabillón
- Department of Family & Consumer Sciences, New Mexico State University, Las Cruces, NM 88003, USA
- Center of Excellence in Sustainable Food and Agricultural Systems, New Mexico State University, Las Cruces, NM 88003, USA
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Leanse LG, dos Anjos C, Kaler KR, Hui J, Boyd JM, Hooper DC, Anderson RR, Dai T. Blue Light Potentiates Antibiotics in Bacteria via Parallel Pathways of Hydroxyl Radical Production and Enhanced Antibiotic Uptake. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303731. [PMID: 37946633 PMCID: PMC10754126 DOI: 10.1002/advs.202303731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 09/13/2023] [Indexed: 11/12/2023]
Abstract
In the age of antimicrobial resistance, the urgency by which novel therapeutic approaches need to be introduced into the clinical pipeline has reached critical levels. Antimicrobial blue light (aBL), as an alternative approach, has demonstrated promise as a stand-alone therapeutic method, albeit with a limited window of antimicrobial activity. Work by others indicates that treatment with antibiotics increases the production of reactive oxygen species (ROS) which may, in part, contribute to the bactericidal effects of antibiotics. These findings suggest that there may be potential for synergistic interactions with aBL, that similarly generates ROS. Therefore, in this study, the mechanism of aBL is investigated, and the potential for aBL to synergistically promote antibiotic activity is similarly evaluated. Furthermore, the translatability of using aBL and chloramphenicol in combination within a mouse model of Acinetobacter baumanii burn infection is assessed. It is concluded that porphyrins and hydroxyl radicals driven by "free iron" are paramount to the effectiveness of aBL; and aBL is effective at promoting multiple antibiotics in different multidrug-resistant bacteria. Moreover, rROS up-regulation, and promoted antibiotic uptake are observed during aBL+antibiotic exposure. Lastly, aBL combined with chloramphenicol appears to be both effective and safe for the treatment of A. baumannii burn infection. In conclusion, aBL may be a useful adjunct therapy to antibiotics to potentiate their action.
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Affiliation(s)
- Leon G. Leanse
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMA02114USA
- Health and Sports Sciences HubUniversity of Gibraltar, Europa Point CampusGibraltarGX11 1AAGibraltar
| | - Carolina dos Anjos
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMA02114USA
| | - Kylie Ryan Kaler
- Department of Biochemistry and MicrobiologyRutgers UniversityNew BrunswickNew Jersey08901USA
| | - Jie Hui
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMA02114USA
| | - Jeffrey M. Boyd
- Department of Biochemistry and MicrobiologyRutgers UniversityNew BrunswickNew Jersey08901USA
| | - David C. Hooper
- Division of Infectious DiseasesMassachusetts General Hospital, Harvard Medical SchoolBostonMA02114USA
| | - R. Rox Anderson
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMA02114USA
| | - Tianhong Dai
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMA02114USA
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Cong X, Krolla P, Khan UZ, Savin M, Schwartz T. Antibiotic resistances from slaughterhouse effluents and enhanced antimicrobial blue light technology for wastewater decontamionation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:109315-109330. [PMID: 37924165 PMCID: PMC10622382 DOI: 10.1007/s11356-023-29972-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 09/15/2023] [Indexed: 11/06/2023]
Abstract
The frequencies of 6 different facultative pathogenic bacteria of the ESKAPE group (priority list WHO) and a total of 14 antibiotic resistance genes (ARGs) with different priorities for human medicine were quantified in wastewaters of poultry and pig slaughterhouses using molecular biological approaches. Raw sewage from poultry and pig slaughterhouses was found to be contaminated not only with facultative pathogenic bacteria but also with various categories of clinically relevant ARGs, including ARGs against the reserve antibiotics group. The concentration of the different gene targets decreased after on-site conventional biological or advanced oxidative wastewater treatments, but was not eliminated. Hence, the antimicrobial BlueLight (aBL) in combination with a porphyrin photo-sensitizer was studied with ESKAPE bacteria and real slaughterhouse wastewaters. The applied broad LED-based blue light (420-480 nm) resulted in groups of sensitive, intermediate, and non-sensitive ESKAPE bacteria. The killing effect of aBL was increased in the non-sensitive bacteria Klebsiella pneumoniae and Enterococcus faecium due to the addition of porphyrins in concentrations of 10-6 M. Diluted slaughterhouse raw wastewater was treated with broad spectrum aBL and in combination with porphyrin. Here, the presence of the photo-sensitizer enhanced the aBL biocidal impact.
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Affiliation(s)
- Xiaoyu Cong
- Microbiology/Molecular Biology Department, Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Peter Krolla
- Microbiology/Molecular Biology Department, Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Umer Zeb Khan
- Bioengineering Department, Faculty Life Sciences, Rhein-Waal University of Applied Sciences, Marie Curie Straße 1, 47533, Kleve, Germany
| | - Mykhailo Savin
- Institute for Hygiene and Public Health (IHPH), Medical Faculty, University of Bonn, Venusberg-Campus 1, 53127, Bonn, Germany
| | - Thomas Schwartz
- Microbiology/Molecular Biology Department, Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
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Leanse LG, Marasini S, dos Anjos C, Dai T. Antimicrobial Resistance: Is There a 'Light' at the End of the Tunnel? Antibiotics (Basel) 2023; 12:1437. [PMID: 37760734 PMCID: PMC10525303 DOI: 10.3390/antibiotics12091437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 07/30/2023] [Accepted: 08/08/2023] [Indexed: 09/29/2023] Open
Abstract
In recent years, with the increases in microorganisms that express a multitude of antimicrobial resistance (AMR) mechanisms, the threat of antimicrobial resistance in the global population has reached critical levels. The introduction of the COVID-19 pandemic has further contributed to the influx of infections caused by multidrug-resistant organisms (MDROs), which has placed significant pressure on healthcare systems. For over a century, the potential for light-based approaches targeted at combatting both cancer and infectious diseases has been proposed. They offer effective killing of microbial pathogens, regardless of AMR status, and have not typically been associated with high propensities of resistance development. To that end, the goal of this review is to describe the different mechanisms that drive AMR, including intrinsic, phenotypic, and acquired resistance mechanisms. Additionally, the different light-based approaches, including antimicrobial photodynamic therapy (aPDT), antimicrobial blue light (aBL), and ultraviolet (UV) light, will be discussed as potential alternatives or adjunct therapies with conventional antimicrobials. Lastly, we will evaluate the feasibility and requirements associated with integration of light-based approaches into the clinical pipeline.
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Affiliation(s)
- Leon G. Leanse
- Health and Sports Sciences Hub, University of Gibraltar, Europa Point Campus, Gibraltar GX11 1AA, Gibraltar
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA; (C.d.A.); (T.D.)
| | - Sanjay Marasini
- New Zealand National Eye Centre, Department of Ophthalmology, The University of Auckland, Auckland 1142, New Zealand;
| | - Carolina dos Anjos
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA; (C.d.A.); (T.D.)
| | - Tianhong Dai
- Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA; (C.d.A.); (T.D.)
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Shashin DM, Demina GR, Linge IA, Vostroknutova GN, Kaprelyants AS, Savitsky AP, Shleeva MO. The Effect of Antimicrobial Photodynamic Inactivation on the Protein Profile of Dormant Mycolicibacterium smegmatis Containing Endogenous Porphyrins. Int J Mol Sci 2023; 24:13968. [PMID: 37762271 PMCID: PMC10531400 DOI: 10.3390/ijms241813968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/01/2023] [Accepted: 09/05/2023] [Indexed: 09/29/2023] Open
Abstract
During transition into a dormant state, Mycolicibacterium (Mycobacterium) smegmatis cells are able to accumulate free porphyrins that makes them sensitive to photodynamic inactivation (PDI). The formation of dormant cells in a liquid medium with an increased concentration of magnesium (up to 25 mM) and zinc (up to 62 µM) resulted in an increase in the total amount of endogenous porphyrins in dormant M. smegmatis cells and their photosensitivity, especially for bacteria phagocytosed by macrophages. To gain insight into possible targets for PDI in bacterial dormant mycobacterial cells, a proteomic profiling with SDS gel electrophoresis and mass spectrometry analysis were conducted. Illumination of dormant forms of M. smegmatis resulted in the disappearance of proteins in the separating SDS gel. Dormant cells obtained under an elevated concentration of metal ions were more sensitive to PDI. Differential analysis of proteins with their identification with MALDI-TOF revealed that 45.2% and 63.9% of individual proteins disappeared from the separating gel after illumination for 5 and 15 min, respectively. Light-sensitive proteins include enzymes belonging to the glycolytic pathway, TCA cycle, pentose phosphate pathway, oxidative phosphorylation and energy production. Several proteins involved in protecting against oxygen stress and protein aggregation were found to be sensitive to light. This makes dormant cells highly vulnerable to harmful factors during a long stay in a non-replicative state. PDI caused inhibition of the respiratory chain activity and destroyed enzymes involved in the synthesis of proteins and nucleic acids, the processes which are necessary for dormant cell reactivation and their transition to multiplying bacteria. Because of such multiple targeting, PDI action via endogenous porphyrins could be considered as an effective approach for killing dormant bacteria and a perspective to inactivate dormant mycobacteria and combat the latent form of mycobacteriosis, first of all, with surface localization.
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Affiliation(s)
- Denis M. Shashin
- A.N. Bach Institute of Biochemistry, Federal Research Centre ‘Fundamentals of Biotechnology’ of the Russian Academy of Sciences, Moscow 119071, Russia; (D.M.S.); (G.R.D.); (G.N.V.); (A.S.K.)
| | - Galina R. Demina
- A.N. Bach Institute of Biochemistry, Federal Research Centre ‘Fundamentals of Biotechnology’ of the Russian Academy of Sciences, Moscow 119071, Russia; (D.M.S.); (G.R.D.); (G.N.V.); (A.S.K.)
| | - Irina A. Linge
- Central Institute for Tuberculosis, Moscow 107564, Russia;
| | - Galina N. Vostroknutova
- A.N. Bach Institute of Biochemistry, Federal Research Centre ‘Fundamentals of Biotechnology’ of the Russian Academy of Sciences, Moscow 119071, Russia; (D.M.S.); (G.R.D.); (G.N.V.); (A.S.K.)
| | - Arseny S. Kaprelyants
- A.N. Bach Institute of Biochemistry, Federal Research Centre ‘Fundamentals of Biotechnology’ of the Russian Academy of Sciences, Moscow 119071, Russia; (D.M.S.); (G.R.D.); (G.N.V.); (A.S.K.)
| | - Alexander P. Savitsky
- A.N. Bach Institute of Biochemistry, Federal Research Centre ‘Fundamentals of Biotechnology’ of the Russian Academy of Sciences, Moscow 119071, Russia; (D.M.S.); (G.R.D.); (G.N.V.); (A.S.K.)
| | - Margarita O. Shleeva
- A.N. Bach Institute of Biochemistry, Federal Research Centre ‘Fundamentals of Biotechnology’ of the Russian Academy of Sciences, Moscow 119071, Russia; (D.M.S.); (G.R.D.); (G.N.V.); (A.S.K.)
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