Effects of Postharvest Quality of Different Litchi Varieties treated with Blue LED Light Combined with Modified Atmosphere Packaging
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Abstract:
The effect of LED blue light treatment combined with modified atmosphere packaging on the quality of different varieties of litchi after harvesting was investigated. Three litchi varieties with leaves (Guiwei, Nuomici and Fei Zi Xiao) were selected for the investigation. They were stored at 4 ℃ in modified atmosphere packaging. The packaged litchi fruits were irradiated using monochromatic blue LED light (primary wavelength (449±5) nm, light intensity (110±5) lx) for 12 h per day (treatment group), whereas the control group was stored in dark. Litchi samples were collected on days 0, 2, 4, 6 and 8, and then the relevant quality indices were measured. The results show that monochromatic blue LED light treatment could alleviate the degree of postharvest browning of the different litchi varieties. The browning coefficient on the sixth day of irradiated Fei Zi Xiao litchi was only 0.23, and that of Guiwei litchi on the eighth day was only 0.37. LED blue light treatment also inhibited the accumulation of malondialdehyde (MDA) in different varieties of litchi, and delayed the reduction of total phenols, total soluble solids (TSS), anthocyanins (LPCs), and titratable acid (TA) content. Moreover, the polyphenol oxidase (PPO) and peroxidase (POD) activities were effectively inhibited. Thus, the combination of LED blue light treatment combined and modified atmosphere packaging demonstrates remarkable efficacy in preventing the deterioration of postharvest quality of different litchi varieties, thereby providing the theoretical basis for the research and development of postharvest preservation technology specific to litchi.
