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Corona discharge plasma jet for inactivation of Escherichia coli O157:H7 and Listeria monocytogenes on inoculated pork and its impact on meat quality attributes

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Abstract

Corona discharge plasma jet (CDPJ) was used for inactivation of Escherichia coli O157:H7 and Listeria monocytogenes inoculated experimentally onto the surfaces of fresh and frozen pork. CDPJ was generated with an output voltage of 20 kV direct current and a frequency of 58 kHz. Optimal inactivation was found with plasma created at a current of 1.5 A, and at a span length of 25 mm between the plasma electrode tip and the sample. Following CDPJ treatment (0–120 s) of pork samples, reductions in E. coli O157:H7 and L. monocytogenes were 1.5 log and >1.0 log units, respectively. The inactivation pattern fitted well to the Singh-Heldman model or pseudo-first-order kinetics. Compared to untreated pork, with the exception of color and appearance, no statistically significant (P > 0.05) changes were observed in volatile basic nitrogen, peroxide value, or 2-thiobarbituric acid reactive substances of CDPJ-treated pork. Furthermore, CDPJ treatment had no significant impact on the sensory characteristics of frozen pork although there was some effect on unfrozen pork.

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Acknowledgments

This study was supported by Technology Development Programs of the Ministry of Agriculture, Food and Rural Affairs and the Rural Development Administration, Republic of Korea.

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  1. Department of Food Science & Biotechnology, Gachon University, Seongnam-si, Gyeonggi-do, 461-701, Korea

    Soee Choi, Pradeep Puligundla & Chulkyoon Mok

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  1. Soee Choi
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  2. Pradeep Puligundla
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  3. Chulkyoon Mok
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Correspondence to Chulkyoon Mok.

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Choi, S., Puligundla, P. & Mok, C. Corona discharge plasma jet for inactivation of Escherichia coli O157:H7 and Listeria monocytogenes on inoculated pork and its impact on meat quality attributes. Ann Microbiol 66, 685–694 (2016). https://doi.org/10.1007/s13213-015-1147-5

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  • DOI: https://doi.org/10.1007/s13213-015-1147-5

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