Residues and Decline of Chemical Hybridizing Agent SQ-1 in Leaves and Spikelets of Foxtail Millet

ZHU Qidi;WENG Qunzhu;ZHANG Gaisheng;JU Lan;ZHANG Jiao;YU Yong'ang;ZHAO Zhuojun;NIU Na;WANG Junwei;MA Shoucai;Key Laboratory of Crop Heterosis of Shaanxi Province, Wheat Breeding Engineering Research Center, Ministry of Education,Yangling Branch of State Wheat Improvement Center, National Yangling Agricultural Biotechnology & Breeding Center,College of Agriculture, Northwest A&F University;  

A high performance liquid chromatography method was developed for determining chemical hybridizing agent SQ-1 and its dissipation curve in leaves and spikelets of foxtail millet. The samples were extracted with acetonitrile, cleaned up with N-propylethylenediamine(PSA) and quantified by the external standard method. There was a good linear relationship between the peak area and concentration of SQ-1 over the range from 1 to 1 000 mg/L, and the linear equation was y = 30 377 x + 27 634, with a correlation coefficient of 0.999 9. The lowest detectable concentration was 0.05 mg/kg. The mean recoveries of SQ-1 in leaves and spikelet of foxtail millet varied from 87.0% to 95.5% with a relative standard deviation ranging from 0.74% to 2.28% at fortification levels of 10–500 mg/kg. The results indicated that SQ-1 could be transported from leaves to spikelets. The trend of SQ-1 residual dynamics was first increased and then decreased. The halflives of SQ-1 were 1.83–2.08 days in leaves and no SQ-1 pesticide residues were detected after 21 days. The half-lives of SQ-1 were 25.21–28.41 days in spikelets, and its degradation rate in spikelets was significantly lower than in leaves.

【Fund】： 国家高技术研究发展计划(863计划)项目(2011AA10A106);; 国家自然科学基金重大项目(31171611;31371697);; 陕西省科技统筹创新工程计划课题(2014KTZB02-01-02)
【CateGory Index】： S481.8

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