Effect of High Energy Electron Beam Irradiation on Epidermis Color of Certain Imported Fruits

In order to provide basis for irradiation use on quarantine of fresh fruits,effects of E-beam irradiation on skin color of mango(honeys,R2E2) and carambola were studied.Results showed that,macroscopical changes of fruits skin color were not occurred for those fruits which were just irradiated with doses of 0.43,0.85,1.26,1.68 kGy.But the total color difference(ΔE) of fruits were detected,and 1.68 kGy treated fruits was higher than that of lower dose treated ones.After storage at shelf situation(15~25 ℃) for 7 days,the differences of skin color of which were treated at different dosage were macroscopical.Skins browning were observed which increased with the higher doses,and the ripening of honeys was inhibited.These results indicated that,the appropriate irradiation dose for carambola would be under 0.43 kGy while those for mango(honeys,R2E2) would be under 0.85 kGy.In addition,the correlation analysis between values of L*,a*,b* and irradiation dose showed that a* plays an important role in evaluation of irradiated fruits color because it was significantly correlated with irradiation dose.