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Treating Surfaces with a Cold Atmospheric Pressure Plasma using the COST-Jet
Published on: November 2, 2020
Cold atmospheric pressure plasma processing of grape juice: Effects on bioactive properties, microbial inactivation,
Aleyna Tali1, Muhammed Talha Akbulut1, Ozlem Ntougkiantzi1
1Faculty of Agriculture, Department of Food Engineering, Tekirdağ Namik Kemal University, Tekirdağ, Türkiye.
Abstract:
This study investigates the effects of cold atmospheric pressure plasma treatment on the bioactive composition, microbial stability, and physicochemical quality of grape juice. Samples were treated for 1-4 min, and changes in total phenolic content (TPC), antioxidant capacity (DPPH and cupric ion reducing antioxidant capacity [CUPRAC] assays), pH, Brix, titratable acidity, and color parameters (L*, a*, b*) were measured. Microbial analyses, including total mesophilic aerobic bacteria (TMAB) and yeast-mold counts, were conducted both immediately after treatment and during 28 days of refrigerated storage at 4 °C. Plasma treatment reduced TPC from 221.0 to 156.0 mg GAE/L and CUPRAC antioxidant activity from 4.26 to 2.06 µmol TE/L after 4 min. After 28 days of refrigerated storage, yeast-mold counts reached 4.54 log CFU/mL in the control sample, whereas no detectable growth was observed in the sample treated with plasma for 4 min. The TMAB were not detected either before or after plasma treatment. Kinetic modeling revealed that first-order kinetics provided the best fit for TPC degradation and antioxidant capacity, while microbial inactivation also followed a predictable logarithmic decline over treatment time. A treatment duration of 2-3 min preserved over 70% of antioxidant activity and caused minimal changes in quality while effectively reducing yeast and mold growth (by 0.81-1.32 log compared to the control) during refrigerated storage. These results suggest that cold plasma shows promising potential as a nonthermal processing method for fruit juice, with the ability to enhance microbial safety and maintain quality parameters with limited nutrient loss.
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