Effects of ultrasound-assisted low-concentration chlorine washing on ready-to-eat winter jujube (Zizyphus jujuba Mill. cv. Dongzao): Cross-contamination prevention, decontamination efficacy, and fruit quality

• DOI: 10.1016/j.ultsonch.2021.105905
• Publication Date: 2021-12-29T08:18:44Z
• Authors: Jiayi Wang; Kun Huang; Zhaoxia Wu; Yougui Yu
• Keywords: Mesophile; Titratable acid; Human decontamination; Hand sanitizer; Peracetic acid

Wash water is circulated for use in the minimal processing industry, and inefficient disinfection methods can lead to pathogen cross-contamination. Moreover, few strategies are available ready-to-eat fruits that do not need be cut. In this study, of chlorine ultrasound, two low-cost methods, were evaluated disinfect winter jujube, a delicious, nutritious, widely sold fruit China. Ultrasound treatment (28 kHz) alone could decrease cross-contamination incidence Escherichia coli O157:H7, non-O157 E. coli, Salmonella Typhimurium, free at 10 ppm decreased from 55.00% 5.00% 65.00% 6.67% non-157 70.00% S. Typhimurium. The was completely reduced (pathogens detected sample) when treatments combined. counts aerobic mesophiles, psychrophiles, molds, yeasts, three pathogens group subjected combination kHz ultrasound + chlorine) significantly lower than those control, chlorine-treated, ultrasound-treated groups during storage (0-7 d 4 °C). Analysis weight loss, sensory quality (crispness, color, flavor), instrument color (a*/b*), soluble matter contents (total solids, reducing sugar, total titratable acid), nutritional properties (ascorbic acid polyphenolic contents) indicated with chlorine, their did additional loss compared control. Additionally, activities phenylalanine ammonia-lyase polyphenol oxidase increased group, consistent analysis results. These findings provide insights into uncut using minimum dose disinfectant prevention under ultrasonication. decontaminate fresh produce accompanied by high risk contamination, sanitizers recommended.