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Microscopic and Spectroscopic Evaluation of Inactivation of Staphylococcus aureus by Pulsed UV Light and Infrared Heating

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Abstract

Pulsed UV light and infrared heat-treated Staphylococcus aureus cells were analyzed using transmission electron microscopy to identify the cell damage due to the treatment process. A 5-s treatment with pulsed UV light resulted in complete inactivation of S. aureus even after enrichment. The temperature increase during the pulsed UV light treatment was insignificant, which suggested a nonthermal treatment. S. aureus was also infrared heat treated using an infrared heating system with six infrared lamps. Five milliliters of S. aureus cells in phosphate buffer was treated at 700°C lamp temperature for 20 min. The microscopic observation clearly indicated that there was cell wall damage, cytoplasmic membrane shrinkage, cellular content leakage, and mesosome disintegration after both pulsed UV light and infrared treatments. Fourier transform infrared microspectrometry was successfully used to classify the pulsed UV light and infrared heat-treated S. aureus by discriminant analysis.

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Acknowledgments

Funding for this study was provided in part by USDA Special Research Grant (2002-34163-11837) and Pennsylvania Agricultural Experiment Station. Pulsed UV light system was provided by a grant from NASA Food Technology Commercial Space Center. The authors express their sincere appreciation to the staff at the electron microscopy facility of Pennsylvania State University, especially Dr. Gang Ning, Ruth Haldeman, and Missy Hazen for their technical support. We would like to acknowledge Dr. Eric T. Harvill and Dr. Andrew Henderson for granting permission to use their equipment and facility. We also would like to express our gratitude to Xenon for providing technical support for the pulsed UV light system.

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Authors and Affiliations

  1. Department of Food and Animal Sciences, Alabama A&M University, Normal, AL, 35762, USA

    Kathiravan Krishnamurthy

  2. Department of Fiber Science and Apparel Design, Cornell University, Ithaca, NY, 1485, USA

    Jagdish C. Tewari

  3. Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, 4790, USA

    Joseph Irudayaraj

  4. Department of Agricultural and Biological Engineering, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 1680, USA

    Ali Demirci

  5. Pennsylvania State University, 231 Agricultural Engineering Building, University Park, PA, 16802, USA

    Ali Demirci

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  1. Kathiravan Krishnamurthy
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  2. Jagdish C. Tewari
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  3. Joseph Irudayaraj
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  4. Ali Demirci
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Correspondence to Ali Demirci.

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Krishnamurthy, K., Tewari, J.C., Irudayaraj, J. et al. Microscopic and Spectroscopic Evaluation of Inactivation of Staphylococcus aureus by Pulsed UV Light and Infrared Heating. Food Bioprocess Technol 3, 93–104 (2010). https://doi.org/10.1007/s11947-008-0084-8

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