Effect of initial oxygen concentration and film oxygen transmission rate on the quality of fresh-cut romaine lettuce

• Published in: Journal of the science of food and agriculture Vol. 85; no. 10; pp. 1622 - 1630
• Main Authors: Kim, J.G, Luo, Y, Tao, Y, Saftner, R.A, Gross, K.C
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 15.08.2005; Wiley; John Wiley and Sons, Limited
• Subjects: Biological and medical sciences; cell respiration; Food industries; Food preservation; Food science; fresh-cut foods; fresh-cut lettuce; Fruit and vegetable industries; Fundamental and applied biological sciences. Psychology; gas composition; Lactuca sativa; Lettuce; minimally processed; modified atmosphere; modified atmosphere packaging; Oxygen; oxygen tranmission rate; oxygen transmission rate; packaging materials; permeability; plastic film; polypropylenes; postharvest physiology; postharvest technology; Quality; respiration rate; romaine lettuce; storage quality; Oxygen; Vegetables; gas composition; Film; respiration rate; Rate; fresh-cut lettuce; oxygen transmission rate; Concentration; postharvest technology; Lettuce; Quality; modified atmosphere; Oxygen effect; minimally processed
• ISSN: 0022-5142; 1097-0010
• DOI: 10.1002/jsfa.2158

Modified atmosphere packaging (MAP) is widely used to maintain the quality of fresh-cut produce by matching the oxygen transmission rate (OTR) of the packaging film to the respiration rate of the packaged product. The effect of the interaction between film OTR and the initial headspace O2 on quality of fresh-cut vegetables has not previously been reported. Romaine lettuce leaves were sliced, washed, dried and packaged with film OTRs of 8.0 and 16.6 pmol s(-1) m(-2) Pa(-1), and with initial headspace O2 of 0, 1, 2.5, 10 and 21 kPa. Packages were hermetically sealed and stored at 5 degrees C for up to 14 days. For samples packaged in 16.6 OTR film, increasing the initial headspace O2 concentration delayed O2 depletion within the packages, hastened the onset and increased the intensity of discoloration, and inhibited the development of CO2 injury, acetaldehyde and ethanol accumulation, off-odors and electrolyte leakage. With 8.0 OTR-packaged lettuce pieces, less than or equal to 1 kPa initial headspace O2 treatments induced an essentially anaerobic environment within the packages and increased acetaldehyde and ethanol accumulation and off-odor development. Increasing the initial O2 concentration above 1 kPa in 8.0 OTR packages transiently increased O2 concentrations and reduced fermentative volatile production, off-odors, electrolyte leakage and CO2 injury. Regardless of initial headspace O2 concentration, all 16.6 OTR-packaged samples had severe discoloration after 14 days of storage. Quality was better maintained in 8.0 OTR-packaged lettuce pieces as the initial headspace O2 concentration was increased. A 21 kPa initial O2 treatment of 8.0 OTR-packaged lettuce maintained good quality throughout storage and had the best overall quality score.