Application of a Dielectric Barrier Discharge Atmospheric Cold Plasma (Dbd‐Acp) for Eshcerichia ColiInactivation in Apple Juice

• Autores: Xinyu Liao, Jiao Li, Aliyu Idris Muhammad, Wenjun Zhu, Shi Sun, Fei Yang, Donghong Liu, Tian Ding
• Localización: Journal of food science, ISSN 0022-1147, Vol. 83, Nº 2, 2018, págs. 401-408
• Idioma: inglés
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• Resumen

  • Atmospheric cold plasma (ACP) is a promising non‐thermal technology in food industry. In this study, a dielectric barrier discharge (DBD)‐ACP exhibited strong bactericidal effect on Escherichia coliin apple juice. Under a 30 to 50 W input power, less than 40 s treatment time was required for DBD‐ACP to result in 3.98 to 4.34 log CFU/mL reduction of E. coliin apple juice. The inactivation behavior of ACP on E. coliwas well described by the Weibull model. During the treatment, the cell membrane of E. coliwas damaged severely by active species produced by plasma, such as hydrogen peroxide, ozone and nitrate. In addition, the ACP exposure had slight effect on the °Brix, pH, titratable acidity (TA), color values, total phenolic content, and antioxidant capacity of apple juice. However, higher level of DBD‐ACP treatment, 50 W for more than 10 s in this case, resulted in significant change of the pH, TA, color and total phenolic content of apple juice. The results in this study have provided insight in potential use of DBD‐ACP as an alternative to thermal processing for fruit juices in food industry. Escherichia coliO157:H7 in apple juice is a potential risk for public health. This study demonstrated that 30 s cold plasma treatment resulted in more than 4 log CFU/mL reduction under 50 W, while the quality attributes of apple juice were not significantly affected. Therefore, cold plasma technology is a promising alternative substitute of traditional thermal processing for juice pasteurization.