https://doi.org/10.4081/ltj.2023.314 Spectra of pathogens predict lethality of blue light photo-inactivation PDF Vol. 30 No. 1 (2023) Submitted: 11 January 2023 Accepted: 24 April 2023 Published: 18 May 2023 antimicrobial phototherapy, antibiotic resistance, whole-cell spectroscopy Abstract Views: 2404 PDF: 99 Publisher's note All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher. Authors David M. Harris bmcinc@comcast.net https://orcid.org/0000-0003-4091-5590 Rutgers School of Dental Medicine, Newark, NJ; Bio-Medical Consultants & Associates, Inc., Canandaigua, NY California State University Chico, Chico, CA, United States. Abstract Whole-cell spectra of human pathogens are examined to identify species-specific wavelengths of maximum light absorption. It is presented how these data relate to clinical efficacy for antimicrobial phototherapies. Twelve species of microorganisms were cultured to exponential growth then processed and suspended in a scattering solution. Diffuse reflectance from the sample was delivered to two spectrometers that covered a spectral range of 370nm to 1200nm. Reflectance spectra were converted to relative absorbance. Absorbance spectra from multiple trials were averaged to produce a representative spectrum for each species. All pathogens studied demonstrated an absorbance spectrum with a primary component in the range 405-426 nm and 1-4 secondary components in the range 445-636 nm. Antibiotic-resistant and antibiotic-sensitive strains of Pseudomonas aeruginosa (Pa) had identical absorbance spectra. Whole-cell spectra support the hypothesis that a pathogen’s absorbance is directly related to efficacy of photoinactivation. The spectral signatures in all pigmented bacteria tested appear to be that of various combinations of in situ porphyrins. The knowledge of the absorption spectrum of a given pathogen provides a logical start for selecting the appropriate light source for a clinical trial. Metrics Dimensions Altmetric PlumX Metrics Downloads Download data is not yet available. Citations References Salyers AA, Whitt DD. Revenge of the microbes: how bacterial resistance is undermining the antibiotic miracle. Washington, D.C: ASM Press; 2005. 186 p. DOI: https://doi.org/10.1128/9781555817602 Donlan RM, Costerton JW. Biofilms: survival mechanisms of clinically relevant microorganisms. Clin Microbiol Rev 2002;15:167–93. DOI: https://doi.org/10.1128/CMR.15.2.167-193.2002 Olsen I. Biofilm-specific antibiotic tolerance and resistance. 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