Scientific journal

61 2022

Journal of Food and Nutrition Research
Summary No. 3 / 2022

Machuca, A. – Amoros, A. – Escalona, V. H.
Effects of ozonated water as a sanitizer on quality and safety of fresh baby leaves red chard
Journal of Food and Nutrition Research, 61, 2022, No. 3, s. 286-295

Víctor Hugo Escalona, Postharvest Studies Center, Faculty of Agricultural Sciences, University of Chile, Santa Rosa 11315, La Pintana, P.O. Box 1004, Santiago, Chile; Department of Agricultural Production, Faculty of Agricultural Sciences, University of Chile, Santa Rosa 11315, La Pintana, P.O. Box 1004, Santiago, Chile. E-mail: vescalona@uchile.cl

Received 1 April 2022; 1st revised 9 July 2022; accepted 14 July 2022; published online 20 September 2022.

Summary: In recent years, an increased demand worldwide for minimally processed products, especially leafy green salads, has been linked to an increased number of outbreaks of human gastroenteritis caused by associated food-borne pathogens, including Escherichia coli. In this study, treatment with ozone of simulated contaminations with E. coli (6–7 log CFU·g-1) on the baby leaves red chard at harvest and in the water used for washing were evaluated. Leaves (inoculated directly on leaves or inoculated in wash water) were washed by immersion in water with various doses of ozone (0 mg·l-1, 0.5 mg·l-1 and 1.0 mg·l-1) for 3 min. Then they were packed and stored at 5 °C for 12 days. On each day of evaluation, E. coli counts as well as leaf colour, respiration rate, chlorophyll, total phenolics content and antioxidant capacity were evaluated. The results indicated that simulated E. coli contamination on postharvest leaves was more difficult to reduce by ozonated water than contamination that occurred during the washing phase. Baby leaves red chard washed in ozonated water kept the quality parameters such as leaf colour, total phenolics content and antioxidant capacity during storage at 5 °C for 12 days.

Keywords: Beta vulgaris; fresh cut; ozone; safety; vegetables; phenolics

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