Effect of nitric oxide (NO) and associated control treatments on the metabolism of fresh-cut apple slices in relation to development of surface browning |
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| Institution: | 1. School of Environmental and Life Sciences, University of Newcastle, Ourimbah, NSW 2258, Australia;2. NSW Department of Primary Industries, Ourimbah, NSW 2258, Australia;1. KU Leuven, BIOSYST-MeBioS Willem de Croylaan 42, 3001 Leuven, Belgium;2. KU Leuven, Crop Biotechnics, Molecular Plant Hormone Physiology Lab, Willem de Croylaan 42, 3001 Leuven, Belgium;3. Flanders Centre of Postharvest Technology, Willem de Croylaan 42, 3001 Leuven, Belgium;1. Department of Horticultural Sciences, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Iran;2. Department of Horticultural Sciences, Faculty of Agriculture, University of Guilan, Rasht, Iran;1. College of Food Science and Technology, Bohai University, 121013 Jinzhou, PR China;2. National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, 121013 Jinzhou, PR China;3. College of Life Science, Yan’an University, Shanxi Key Lab of Chinese Jujube, 716000 Yan’an, PR China;1. Guangdong Key Laboratory for Postharvest Science and Technology of Fruits and Vegetables, College of Horticulture, South China Agricultural University, Guangzhou 510642, China;2. Institute of Agro-products Processing Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, PR China;3. Institute of Agro-products Storage and Processing, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, PR China |
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| Abstract: | Surface browning is an important cause of deterioration of fresh-cut apples during postharvest handling. ‘Granny Smith’ apple slices treated with NO gas (10 μL/L) and the NO donor compound 2,2′-(hydroxynitrosohydrazino)-bisethanamine (diethylenetriamine nitric oxide (DETANO) (10 mg/L) dissolved in phosphate buffer (pH 6.5) showed delayed development of surface browning during storage at 5 °C and also resulted in a lower level of total phenols, inhibition of PPO activity, reduced ion leakage and reduced rate of respiration but had no significant effect on ethylene production or lipid peroxide level as measured by malondialdehyde (MDA) and hydrogen peroxide levels. The two control treatments of phosphate buffer (pH 6.5) and water dips also had significant effects compared to untreated slices. The relative effectiveness of treatments in extending postharvest life and reducing total phenols, PPO activity, ion leakage and respiration was DETANO > NO gas > phosphate buffer > water > untreated. Apple slices dipped in chlorogenic acid dissolved in water showed surface browning soon after application but dipping in DETANO solution negated the effect of chlorogenic acid whether applied before or after dipping in chlorogenic acid solution while the buffer and NO gas were also effective. It is suggested that an increase in phenols occurs on the apple surface soon after cutting, possibly as a defensive mechanism of the apple to limit damage to surface cells. The effectiveness of the applied treatments to inhibit development of surface browning may relate to their ability to minimize the level of phenols active on the cut surface possibly in conjunction with a reduced PPO activity. |
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