Abstract
A comparison of the shelf-life of various lettuces (i.e., Ezabel, Butterhead, Pagero, mini Romaine, Caipira and red leaf lettuce) during storage was carried out based on different packaging types. More specifically, the Butterhead lettuce sample was packaged in a polyethylene terephthalate (PET) tray, while the Ezabel, Pagero, mini Romaine, Caipira and red leaf lettuce samples were packaged in polypropylene (PP) film. Changes in the sample weight loss, respiration rate, chlorophyll content, and visual quality were then investigated during storage at 10°C. The Ezabel and Caipira samples exhibited the highest weight loss, whereas the Butterhead sample showed the lowest weight loss. Among the various lettuce samples, the chlorophyll content of the mini Romaine lettuce was the highest. In addition, the freshness of the Butterhead lettuce sample was maintained during 18 days at 10°C, compared to 12 d for the Ezabel, Pagero, mini Romaine, and Caipira samples. These results therefore suggest that tray packaging was effective in maintaining the lettuce quality, while packaging in a PP resulted in leaf softening and discoloration. Larger leaf areas also resulted in longer shelf-life. The development of an optimal packaging for lettuce to ensure that freshness is maintained during storage is therefore necessary.
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