期刊
FOOD SCIENCE AND BIOTECHNOLOGY
卷 30, 期 3, 页码 405-411出版社
KOREAN SOCIETY FOOD SCIENCE & TECHNOLOGY-KOSFOST
DOI: 10.1007/s10068-020-00867-8
关键词
Chokeberry; Corona discharge plasma; Inactivation; Kinetics; Microbial contaminants; Polyphenols
资金
- Ottogi Foundation, Korea
CDPJ treatment for 2 minutes was found to be optimal for improving the microbiological quality of chokeberries while maintaining their total polyphenol content unchanged, although it led to a decrease in DPPH radical scavenging activity.
To improve the microbiological quality of chokeberries, corona discharge plasma jet (CDPJ) was employed as a decontaminating agent. The mean levels of aerobic bacteria and yeast and molds contaminants in chokeberries were 4.78 and 4.87 log CFU/g, respectively; the viable counts were decreased by 2.09 and 1.83 log units following CDPJ treatment for 3 min, respectively. A first-order kinetic model was well-suited for explaining the inactivations. The concentration of total polyphenols of chokeberries was unaffected (up to 3 min treatment), whereas DPPH radical scavenging activity was significantly decreased by CDPJ treatment (2 min and more). CDPJ treatment (all tested times) of chokeberries led to a significant decrease of monomeric anthocyanin content of their corresponding juices, whereas soluble solids content (Brix) and pH were unaffected. After storage at 4 degrees C for 72 h, juices obtained from CDPJ-treated berries possessed relatively low levels of contaminants with no significant alterations in pH and soluble solids content when compared with controls. In conclusion, CDPJ treatment for 2 min was optimal to improve the microbiological quality of the berries without negatively affecting biochemical qualities of their corresponding juices.
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