Effect of Postharvest Low Dose Electron Beam Irradiation on the Antioxidant Capacity of Lentinula edodes
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Abstract:
Fresh Lentinula edodes are susceptible to decay after harvest. In order to improve its post-harvest storage quality, fresh Lentinula edodes were subjected to electron-beam irradiation at doses of 1.0, 2.0 and 3.0 kGy in this study, before a storage at 4±1 ℃ and 80%±5% relative humidity. Then, the effect of low dose electron beam irradiation on the antioxidant capacity of fresh Lentinula edodes was examined based on the evaluation indices such as color, total phenol content, malondialdehyde content, DPPH radical scavenging ability, and activities of antioxidant enzymes (SOD and CAT). The results showed that compared with other doses, the treatment at 2.0 kGy could delay the browning of Lentinus edodes, maintain the total phenol content at a relatively high level, and reduce the accumulation of malondialdehyde (only 0.54 nmol/g at the end of storage). The irradiation dose of 2.0 kGy exhibited significant differences as compared to other groups: scavenged significantly more DPPH free radicals, and maintained higher activities of SOD and CAT (which decreased only by 3.78% and 27.90%, respectively). The above results indicated that electron beam irradiation at 2.0 kGy can enable fresh Lentinus edodes to maintain high post-harvest antioxidant activity thereby delaying the oxidation reaction in Lentinula edodes and prolonging its postharvest shelf life.
