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Effect of modified atmosphere packaging on quality and shelf life of baby leaf lettuce

机译：Effect of modified atmosphere packaging on quality and shelf life of baby leaf lettuce

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摘要

Freshly harvested baby leaf lettuce (Lactuca sativa L. cv. Red Romaine) leaves were packaged with 1,300, 20,000, 40,000, or 100,000 cm~3/m~2/day/atm oxygen transmission rate (OTR) packaging films as modified atmosphere packaging (MAP), as well as perforated film, then stored at 8?°C with 90 relative humidity in order to determine the most suitable OTR film. The results indicated that the 20,000 cm~3 OTR film modified the atmosphere created in the package so that it consisted of 19.25-19.95 oxygen, 1.55-4.90 carbon dioxide and 5.10-8.06 μl/l ethylene. Changes in quality of the lettuce, including weight loss, visual quality, chlorophyll concentration, colour (L*, a*, b*, chroma and hue angle) and off-odour were lowest under the 20,000 cm~3 OTR film. Leaves under the 20,000 cm~3 OTR film also exhibited the highest shelf life at 30 days. The anthocyanin concentration was highest and the peroxidase activity, which results in browning, was lowest under the 20,000 cm~3 OTR film, compared with the other treatments. In the baby leaf lettuce, the antioxidant capacity was tested and measured as flavonoid, phenolic, 1,1-diphenyl-2-picrylhydrazyl and total vitamin C concentrations, all of which showed the highest concentrations under the 20,000 cm~3 OTR film. Therefore, the 20,000 cm~3 OTR film, as a MAP, could be useful for the cold chain distribution of baby leaf lettuce for maintaining quality and thus exporting lettuce for consumer satisfaction.

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