Effect of γ-radiation on post-harvest storage life and quality of onion bulb under ambient condition

Abstract

Different doses of gamma Irradiation (0 Gy, 10 Gy, 60 Gy, 100 Gy and 200 Gy) were evaluated as potential treatment to extend the storage period and maintain the quality attributes of onion bulbs (cv. Punjab Noraya) at ambient temperature for a period of 144 days. It was observed that storage parameters such as physiological loss in weight, sprouting percentage, rotting percentage and quality traits like total soluble solids, firmness, color parameters, ascorbic acid and pyruvic acid varied significantly (p \ 0.05) during storage period with respect to doses of irradiation. No rotting and sprouting were observed upto 24 days and 84 days, respectively in both gamma irradiated and un-irradiated bulbs. At 5 months of storage, the physiological loss in weight varied from 28.5 to 63.6% in all treatments. Physiological weight loss and rotting percentage were higher in the untreated (control) as well as bulbs radiated @ 10 Gy and 200 Gy. Firmness was better retained in the bulbs irradiated with gamma rays @ 120 Gy bulbs upto 84 days of storage. However, no clearcut pattern for colour changes (L, a, b values) was observed with respect to the irradiation doses. TSS in bulbs decreased upto 36 days of storage and thereafter increased upto 48th day of storage irrespective of the dose of gamma irradiation. Ascorbic acid content of bulbs decreases significantly in all the irradiation treatments during storage but pyruvic acid initially increased, then decreased and again increased at the end of the storage period in unirradiated and irradiated treatments. It is concluded that onion bulbs irradiated with gamma rays @ 120 Gy resulted in minimum loss in weight, rotting and sprouting while maintained best quality for 3 months of storage at ambient storage conditions.

Pyramided effects of γ‐irradiation, packaging, and low‐temperature storage on quality, sensory and microbial attributes of minimally processed onion rings

“…Physiological loss in weight (PLW) in both non-radiated and irradiated samples under low temperature was calculated according to the method adopted by Sharma et al (2020aSharma et al ( , 2020b as shown in formulae.…”

“…PLW ( % ) = (Initial weight of onion rings − weight of onion rings after interval of 5 days) × 100 Initial weight of rings . Sharma et al, 2020aSharma et al, , 2020bSharma et al, 2021). The texture analyzer was operated with a test speed of 1 mm/s having 1-mm depth of penetration and other operating parameters such as pre-test speed, post-test speed, return distance, contact weight, and return speed were standardized (Sharma et al, 2020a(Sharma et al, , 2020b.…”

“…Sharma et al, 2020aSharma et al, , 2020bSharma et al, 2021). The texture analyzer was operated with a test speed of 1 mm/s having 1-mm depth of penetration and other operating parameters such as pre-test speed, post-test speed, return distance, contact weight, and return speed were standardized (Sharma et al, 2020a(Sharma et al, , 2020b. From the force v/s time curves, firmness was measured as the maximum force obtained.…”

“…The basic purpose of color measurement was to get an idea of comparative change in color in different treatments during low-temperature storage. Color values of minimally processed onion were recorded using a Color Reader CR-10 colorimeter of Konika Minolta Sensing Inc. (Hunter, 1975;Sharma et al, 2020aSharma et al, , 2020bSharma et al, 2021). The calibration of the apparatus was done before recording the color values using a white plate and black trap.…”

Chemical Composition of Magonia pubescens Essential Oils and Gamma‐Radiation Effects on Its Constituents and Cytotoxic Activity in Leukemia and Breast Cancer Model

“…Concerning the use of EOs, it is important to note the effect of radiation on its composition and activity. EOs are obtained mainly from fresh plant materials and gamma‐radiation is often employed as an alternative to reduce plant sprouting and/or ripening and can eliminate microorganisms, parasites, and pests [13] . In the world scenario, the radiation of natural products, mainly of food products, is a widely spread technique.…”