Abstract
This study focuses on applicability of e-sensing methods in addition to direct epifluorescent filter technique (DEFT), aerobic plate counts (APC), and photostimulated luminescence (PSL) to discriminate e-beam, γ-ray, and X-ray irradiated green onions (scallions) at 1, 4, and 7kGy for each irradiation treatment, along with two confirmatory analysis. Although low dose (1kGy) reduced the APC (6.15-2.69 log CFU/g), no significant difference was observed in DEFT. Scallions with log DEFT/APC ratio of ≥ 5.2 can be suspected as irradiated at at least 1kGy. Both non-irradiated (< 700counts/min) and irradiated (> 5000counts/min) scallions were identified by PSL. Besides distinct volatile compounds profile, cumulative e-nose discrimination of 92.06% from principle component analysis was apparent among irradiation conditions. Sensitivity to changes in perceived taste by e-tongue showed 96.07% variation. The e-sensing capability to discriminate irradiated scallions can be exploited for exposing counterfeit claims as either non-irradiated or irradiated within the recommended standards.
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