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Study on the antimicrobial activity of strongly acidic electrolysed oxidising water for large yellow croaker

Hu, Y., Du, S., Wu, D.M., Luo, H.Y.
Quality assurance and safety of crops & foods 2014 v.7 no.2 pp. 133-139
Bacillus subtilis, Candida, Escherichia coli, Larimichthys crocea, Staphylococcus aureus, acidity, amino acid composition, antibacterial properties, bacteria, electrolysis, electrolyzed water, mixing, quality control, redox potential, texture
This study was to evaluate the bactericidal efficiency of strongly acidic electrolysed water (SAEW) and to consider SAEW used as a safe sanitiser for large yellow croaker (LYC). More specifically, bactericidal activities of four kinds of electrolysed water (SAEW1, SAEW2, SAEW3 and SAEW4) were compared by suspension quantitative bactericidal test. Morphological changes of <i>Escherichia coli</i>, amino acid composition and texture of LYC were evaluated during the SAEW1 treatments and the bacteriostatic mechanism of SAEW was observed. Suspension quantitative bactericidal test showed that bactericidal efficiency of SAEW for <i>Staphylococcus aureus</i>, <i>E. coli</i>, <i>Bacillus subtilis</i> and <i>Candida</i> were 62, 48, 28 and 57%, respectively. Increasing the oxidation-reduction potential of SAEW from 640 to 1,250 mV modified the bactericidal efficiency for the bacteria above-mentioned to 100, 10, 97 and 100%, respectively. The damage process of <i>E. coli</i> O157:H7 under the SAEW1 treatment was observed after mixing the bacterium suspension with SAEW1 for 5 min. Finally, amino acid composition and texture analysis test showed that there were no significant differences (<i>P</i>≯0.05) between the treated and control group. SAEW was proved to be a safe and effective sanitiser of the tested bacteria.