Division of Environmental Physics - User: student
Faculty of Mathematics, Physics and Informatics, Comenius University Bratislava

Chemical and Antimicrobial Effects of Air Non-Thermal Plasma Processing of Fresh Apple Juice with Focus on Safety Aspects

Tarabová B., Tampieri F., Maran E., Marotta E., Ostrihoňová A., Krewing M., Machala Z.
Foods 10 (9), 2055 (2021)

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Abstract:

Freshly squeezed apple juice was subjected to air non-thermal plasma treatment to investigate the capability of this processing method to inactivate microorganisms and to evaluate its safety when applied to liquid food products. Two different configurations of a transient spark discharge in ambient air were tested: an electrospray system with the juice flowing directly through the high voltage needle electrode, and a batch system, where the discharge was generated onto the surface of the juice. The key physico-chemical parameters of the juice, such as pH, conductivity, color, transmittance, and Brix degree, did not significantly change upon treatment. The concentration of nitrate ions formed by the plasma was safe, while that of nitrite ions and hydrogen peroxide was initially higher than the safety limits, but decreased within 24 h post treatment. The plasma effect on individual natural components of the juice, such as sugars, organic acids, and polyphenols, treated in water solutions led to their partial or substantial decomposition. However, when these compounds were plasma-treated altogether in the juice, they remained unaffected. The antimicrobial effect of the plasma processing was evaluated via the inoculation of model microorganisms. A stronger (6 log) decontamination was detected for bacteria Escherichia coli with respect to yeast Saccharomyces cerevisiae. Plasma processing led to a substantial extension of the juice shelf-life by up to 26 days if refrigerated, which represents a promising application potential in food technology.

Citations:

1.)	Eguchi K; Nakashima D and Ishibashi T: Experimental study on discharging current to reduce voltage stress during underwater shock wave generation, Energy reports 8, pp.113-120 (2022) (2022) -------------
2.)	Volkov AG; Hairston JS; (...); Patel D: Redox Reactions of Biologically Active Molecules upon Cold Atmospheric Pressure Plasma Treatment of Aqueous Solutions Molecules 27 (20) (2022) (2022) -------------
3.)	Sawangrat C; Phimolsiripol Y; (...); Boonyawan D: Application of Pinhole Plasma Jet Activated Water against Escherichia coli, Colletotrichum gloeosporioides, and Decontamination of Pesticide Residues on Chili (Capsicum annuum L.) Foods 11 (18)(2022) (2022) -------------
4.)	Tiban NN; Simovic M; (...); Jakobek L: The Effect of High Voltage Electrical Discharge on the Physicochemical Properties and the Microbiological Safety of Rose Hip Nectars, Foods 11 (5)(2022) (2022) -------------