ISHS Acta Horticulturae 1201: VII International Conference on Managing Quality in Chains (MQUIC2017) and II International Symposium on Ornamentals in association with XIII International Protea Research Symposium
The effects of UV-C irradiation on postharvest quality of tomatoes (Solanum lycopersicum) |
| Authors: | L.W. Khubone, A. Mditshwa |
| Keywords: | shelf-life, irradiation, postharvest quality, carotenoids, total soluble solids |
| DOI: | 10.17660/ActaHortic.2018.1201.11 |
| Abstract:
Tomato (Solanum lycopersicum) is globally one of the most important vegetables. It is an important source of antioxidants in the human diet. However, the loss of quality at postharvest is a major issue limiting the shelf-life of tomatoes. Irradiation is a non-thermal technology that eliminates pathogens and extends the shelf-life of fruit and vegetables. This study investigated the potential of UV-C irradiation in delaying the ripening process and enhancing the overall quality of tomatoes. Tomatoes ('Henry's Beauts'), harvested at mature pink stage, were irradiated at 0, 208.2 and 969.8 µW cm-2, three replications of 5 fruits replicate-1 were used. The radiation dose was measured with a portable digital radiometer. After irradiation, the fruits were stored at 20°C for 4, 8, 12 and 16 d. The total soluble solids (TSS), fruit colour and total carotenoids were determined. UV-C irradiation had no significant effect on the TSS, however, measured and calculated fruit colour parameters (a*, L and hue angle) were significantly influenced by irradiation treatments. Exposing fruit to 969.8 µW cm-2 delayed the colour development and ripening process. Irradiation had significant effect on the content of carotenoids. Although fruit exposed to 969.8 µW cm-2 had better overall quality, the development of lesions on exocarp possibly due to high irradiation intensity remains a concern. This study showed the potential of UV-C irradiation treatment as a postharvest tool for the management of tomatoes. Further research aimed at understanding the mechanism of action used by UV-C irradiation is warranted. | |
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