| Title: | Response of pomegranate arils (cv. Wonderful) to low oxygen stress under active modified atmosphere condition |
| Author(s): | Belay ZA; Caleb OJ; Mahajan PV; Opara UL; |
| Address: | "Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Food Science, Faculty of AgriSciences, Stellenbosch University, Stellenbosch, South Africa. Department of Horticultural Engineering, Leibniz-Institute for Agricultural Engineering and Bioeconomy (ATB), Potsdam-Bornim, Potsdam, Germany. Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Science, Faculty of AgriSciences, Stellenbosch University, Stellenbosch, South Africa" |
| ISSN/ISBN: | 1097-0010 (Electronic) 0022-5142 (Linking) |
| Abstract: | "BACKGROUND: Successful characterization of the relationship between respiration rate (RR) and low oxygen (O(2) ) limit is critical for optimizing the modified atmosphere condition. It is well documented that a low O(2) atmosphere reduces the RR of fresh produce, but could also lead to abiotic stress due to the accumulation of glycolysis end products. Therefore, this study investigated the response of pomegranate arils exposed to low O(2) atmosphere (composed of 2 kPa O(2) , 18 kPa carbon dioxide, and 80 kPa nitrogen) and identified the low O(2) limit at 5 degrees C and 10 degrees C. The study aim was achieved by using real-time RR and respiration quotient (RQ) data, microbial growth, identifying changes in the fermentative volatile organic compounds profile, and the consumption of respiratory metabolites (organic acids and individual sugars). RESULTS: The gas concentrations changed significantly respective to the storage temperature and resulted in a significant change in the parameters studied. The response of pomegranate arils to low O(2) stress involves making alterations to the metabolic composition, especially those involved in anaerobiosis, such as the accumulation of ethanol, and an immediate increase on RQ. CONCLUSION: Pomegranate arils (cv. Wonderful) can tolerate down to 1.9 kPa O(2) and 2.3 kPa O(2) concentrations at 5 degrees C and 10 degrees C respectively. (c) 2018 Society of Chemical Industry" |
| Keywords: | Atmosphere/chemistry Cell Respiration Cold Temperature Food Storage/*methods Fruit/*metabolism/microbiology *Lythraceae *Oxygen Volatile Organic Compounds/analysis microbiology respiration rate respiratory metabolites respiratory quotient volatiles; |
| Notes: | "MedlineBelay, Zinash A Caleb, Oluwafemi J Mahajan, Pramod V Opara, Umezuruike L eng Swedish International Development Cooperation Agency/ Organisation for Women in Science for the Developing World/ Department of Science and Technology and National Research Foundation/ England 2018/07/20 J Sci Food Agric. 2019 Feb; 99(3):1088-1097. doi: 10.1002/jsfa.9276. Epub 2018 Sep 17" |
