Park Yeon-Jae, Puligundla Pradeep, Mok Chulkyoon
Department of Food Science and Biotechnology, College of BioNano Technology, Gachon University, Seongnam-si, Gyeonggi-do 13120 Republic of Korea.
Food Sci Biotechnol. 2021 Feb 5;30(3):405-411. doi: 10.1007/s10068-020-00867-8. eCollection 2021 Mar.
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 °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.
为提高黑 chokeberries 的微生物质量，采用电晕放电等离子体射流（CDPJ）作为去污剂。黑 chokeberries 中需氧菌以及酵母菌和霉菌污染物的平均水平分别为 4.78 和 4.87 log CFU/g；经 CDPJ 处理 3 分钟后，活菌数分别减少了 2.09 和 1.83 个对数单位。一级动力学模型非常适合解释这种失活情况。黑 chokeberries 的总多酚浓度未受影响（处理时间长达 3 分钟），而 CDPJ 处理（2 分钟及更长时间）使 DPPH 自由基清除活性显著降低。黑 chokeberries 的 CDPJ 处理（所有测试时间）导致其相应果汁的单体花青素含量显著降低，而可溶性固形物含量（°Brix）和 pH 值未受影响。在 4°C 下储存 72 小时后，与对照相比，经 CDPJ 处理的浆果制成的果汁污染物水平相对较低，pH 值和可溶性固形物含量无显著变化。总之，2 分钟的 CDPJ 处理最适合提高浆果的微生物质量，而不会对其相应果汁的生化质量产生负面影响。
