High oxygen levels promote peel spotting in banana fruit |
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| Institution: | 1. Department of Horticulture, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand;2. Wageningen University and Research Centre, P.O. Box 17, 6700 AA Wageningen, The Netherlands;1. Especialidad de Fruticultura, Campus Montecillo, Colegio de Postgraduados, km. 36.5 Carretera México-Texcoco, 56230 Montecillo, Mexico;2. Departamento de Ingeniería Agroindustrial, Universidad Autónoma Chapingo, km. 38.5 Carretera México-Texcoco, 56230 Texcoco, Mexico;3. Departamento de Ingeniería Mecánica Agrícola, Universidad Autónoma Chapingo, km. 38.5 Carretera México-Texcoco, 56230 Texcoco, Mexico;4. Escuela Superior de Ingeniería Mecánica y Eléctrica, Instituto Politécnico Nacional, Edificio 5, 3er Piso Unidad Zacatenco, Colonia Lindavista, 07738 Distrito Federal, Mexico;5. Departamento de Preparatoria Agrícola, Universidad Autónoma Chapingo, km. 38.5 Carretera México-Texcoco, 56230 Texcoco, Mexico;1. Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, USA;2. Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, USA;3. Department of Psychiatry and Behavioral Sciences, Stony Brook University, Stony Brook, NY, USA;4. Department of Radiology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA;1. Department of Orthopedics and Traumatology, Faculty of Medicine, Akdeniz University, Dumlupinar Avenue, 07058, Konyaalti, Antalya, Turkey;2. Department of Orthopedics and Traumatology, Faculty of Medicine, Sakarya University, Adnan Menderes street, 54100, Sakarya, Turkey;1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B. P. 1171, 3000 Sfax, Tunisia;2. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017, India;3. Department of Physics, Saurashtra University, Rajkot 360005, India;4. UGC-DAE Consortium for Scientific Research, Mumbai Centre, B.A.R.C. Campus, Mumbai 400085, India |
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| Abstract: | We studied the effect of high oxygen on early peel spotting in ‘Sucrier’ bananas held at 25 °C and 90% RH. Fruit first ripened to colour index 3–4 (about as yellow as green) and were then held in containers with a continuous gas flow of 18 ± 2 kPa (control) or 90 ± 2 kPa oxygen. High oxygen promoted peel spotting. The in vitro activities of phenylalanine ammonia lyase (PAL) and polyphenol oxidase (PPO), measured both in the whole peel and in peel spots, were lower in high oxygen than in the controls. The level of total free phenolics, both in the whole peel and in peel spots, was lower in the high oxygen treatment. Dopamine content in the peel spots decreased rapidly, earlier in the high oxygen treatments than in controls. It is concluded that peel spotting was not correlated with in vitro PAL and PPO activities. Decrease in dopamine levels correlated with peel spotting, indicating that it might be used as a substrate for the browning reaction. |
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