Effect of Ultraviolet-C Radiation Combined with Unconventional Atmosphere Packaging on the Quality of Fresh-Cut Arugula (Eruca Sativa Mill.)

The combined effects of ultraviolet (UV) light C (0.34 to 20.13kJ/l(2)) and superatmospheric O-2 (>85%) packaging on the respiration rate, atmospheric composition, microbiological growth and nutritional quality of fresh-cut arugula stored for 10 days at 5C were studied. All treatments performed under increased O-2 levels exhibited a reduction in the respiration rate throughout the cold storage. High microbial load of the raw material were found. UV-C radiation enabled an initial reduction of about 1 and 1.5 log units on mesophilic and psychrotrophic counts, respectively. However, this treatment was not effective for mold control. In addition, a noticeable increase occurred in the total antioxidant capacity and polyphenol content without affecting the visual appearance of the leaves. UV-C radiation, as a sanitizing method, in combination with superatmospheric O-2 conditions maintains the overall quality of fresh-cut arugula and is a feasible alternative to industrial-scale enforcement. Practical ApplicationsOur finding indicates that ultraviolet (UV)-C doses between 15.14 and 20.13kJ/m(2) combined with packaging in high O-2 atmosphere (>85%) are an environmentally friendly disinfection method, effective in preserve fresh-cut arugula during 10 days at 5C. Additionally, the treatments determined an increased compounds considered interesting for consumer health. In fact, UV-C radiation can be applied by a cheap and simple chamber with a relative low maintenance cost being a feasible alternative to small industry.