Abstract
The objective of this work is to evaluate the effects of ultrasound waves on the viability of bacteria that usually occur in mineral waters such as spa thermal waters. The study was carried out at a constant temperature of 309.65 K on two Gram-positive bacteria (Staphylococcus epidermidis, Staphylococcus warneri) and two Gram-negative bacteria (Pseudomonas aeruginosa, Proteus mirabilis) with a concentration of 106 CFU mL−1. A commercial ultrasonic bath was used. The effects of the ultrasounds were analysed using a microcalorimetric technique. The microcalorimetric bacterial growth curves were obtained and, stemming from said curves, the heat released by microorganisms during a culture time of 24 h was calculated. The values of the heat released in the samples treated and untreated with ultrasounds were compared. The ultrasound treatment appears to be effective in inhibiting the growth of the two Gram-positive bacteria, but not in the case of the Gram-negative, which presented greater resistance at the same experimental conditions. This study also shows microcalorimetry as an efficient technique to determine the effect of ultrasound waves on bacterial growth.
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Acknowledgments
We thank María Perfecta Salgado González and Sofía Baz Rodríguez for their collaboration with the technical measures. We are also thankful for the financial support provided by the projects EM 2012/141, C269 131H 64502, CN 2012/285, and “Agrupación estratéxica de Biomedicina (INBIOMED)” by “Xunta de Galicia” and the project FIS 2011-23322 funded by Ministry of Science and Innovation of Spain. All these projects are co-financed with FEDER funds.
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Vázquez, C., Iglesias, T.P., Mourelle, L. et al. Ultrasonic bacterial treatment of mineral waters: a study on S. epidermidis, S. warneri, P. aeruginosa and P. mirabilis . Environ Earth Sci 73, 2863–2868 (2015). https://doi.org/10.1007/s12665-014-3488-y
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DOI: https://doi.org/10.1007/s12665-014-3488-y