Effect of Electron Beam Irradiation on Degradation Rate of 21 Prohibited Pesticides and Active Components of Bupleurum
In order to investigate the effects of electron beam irradiation on degradation of 21 prohibited pesticide residues and active components of bupleurum,the content changes of 21 prohibited pesticides in bupleurum were analyzed by gas chromatography-mass spectrometry(GC-MS/MS),and the content changes of active components in bupleurum were determined by high performance liquid chromatography(HPLC)after electron beam treatment of 4,6,8,10 kGy.The results showed that the degradation rates of 21 prohibited pesticides in bupleurum increased with the increase of irradiation dose,and the maximal degradation rates ranged from 25.58%to 56.61%.The degradation rates of methyl parathion,fipronil sulfone,fipronil and monocrotophos in bupleurum after the 10 kGy irradiation treatment were significantly higher than those of 8 kGy,while the degradation rates of the other 17 pesticides did not show significant difference between 8 kGy and 10 kGy irradiation treatments.In addition,there was no significant change in the contents of saikosaponin a and d after different doses of irradiation treatments.Therefore,taking costs into account,it is concluded that 8 kGy electron beam irradiation can effectively degrade 21 prohibited pesticide residues in bupleurum,and has no significant effect on the content of active components in bupleurum,which can provide technical support for the degradation of 21 pesticides in bupleurum by irradiation.
Electron beam irradiationBupleurumPesticide degradationSaikosaponinGC-MS/MSHPLC
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