Effect of gamma radiation on shelf life and quality of onion (Allium cepa L.)
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Abstract
Results revealed that the irradiated onion bulbs showed minimal weight loss as compared to those of the non-radiated (control) bulbs. For instance, at 280 days after irradiation, the maximum weight loss (84.84%) was found in control, whereas the minimal weight loss (47.72%) was found in 100 Gy-irradiated onion bulbs. Most strikingly, sprouting was completely inhibited by irradiation treatments irrespective of doses, and only the non-radiated (control) bulbs were found to be sprouted (i.e. 0.11 and 89.05% sprouting at the 60 to 280 days after irradiation, respectively). The severity of rots was markedly reduced by the application of gamma radiation. At 280 days after irradiation, the highest percentage of rot (26.31) was found in non-radiated control bulbs, whereas the lowest rot percentage (14.69) was observed in those bulbs irradiated with 100 Gy. Optimal colour, texture, TSS and pH which were mostly maintained in the irradiated bulbs. Size of onion bulbs of untreated control was reduced by 16.14%. In contrast, the size of irradiated bulbs was reduced only 0.98-2.72%. The findings would greatly contribute to reduce enormous postharvest loss of onions and maintain their quality during long-term storage and marketing at ambient condition
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