Comparison of organically and conventionally produced Batavia type lettuce stored in modified atmosphere packaging for postharvest quality and nutritional parameters

Abstract

Background: The impacts of organic and conventional production systems on postharvest life and quality parameters of Batavia type 'Caipira' lettuce heads (Lactuca sativa L.) were investigated. Harvested lettuce heads grown in two different production systems were stored at 0 °C temperature and 95-98% relative humidity for 20 days in modified atmosphere packaging.

Results: The lowest weight loss, the highest ascorbic acid content and antioxidant activity were obtained from the organic production system (Org-2). The conventional production system had higher total soluble solids, titratable acidity, and total phenolic contents. During the shelf-life period at 20 °C, the weight losses of lettuce heads grown conventionally were higher than with the other production system. Conventionally grown heads had higher titratable acidity and total phenolic contents than organically grown heads. The highest titratable acidity and h° values were obtained from the plants grown under conventional and organic production systems (Org-2), while the highest chroma value and antioxidant activity were detected from the control treatment. The highest ascorbic acid content was detected in the control treatment, but the effects of control, organic (Org-2) and conventional production systems on ascorbic acid content were not statistically significant.

Conclusion: The results indicated that the organic production system (Org-2) was the most effective treatment in prolonging postharvest life and protecting the quality of Batavia type 'Caipira' lettuce heads stored in modified atmosphere packaging. © 2018 Society of Chemical Industry.

Keywords: Lactuca sativa organic fertilizers; antioxidant activity; storage; total phenolics.