[Objectives]This study was conducted to establish a method for determining residual coumoxystrobin in vegetables using QeEChERS-liquid chromatography-tandem mass spectrometry(QeEChERS-LC-MS/MS).[Methods]The sample was...[Objectives]This study was conducted to establish a method for determining residual coumoxystrobin in vegetables using QeEChERS-liquid chromatography-tandem mass spectrometry(QeEChERS-LC-MS/MS).[Methods]The sample was extracted by acetonitrile,and the extract was purified by QeEChERS,concentrated by nitrogen blowing,and then detected.[Results]Coumoxystrobin had a good linear relation in the range of 0.01-10.0 mg/kg,and the linear equation was y=4686.92×x+5683.28,R^(2)=0.999.The limit of detection was 0.001 mg/kg,and the limit of quantitation was 0.003 mg/kg.[Conclusions]The method has the advantages of convenient and fast operation and stable detection process,and can provide technical support for the supervision and monitoring of coumoxystrobin.展开更多
[Objectives]This study was conducted to establish a liquid chromatography-tandem mass spectrometry method for the determination of coumoxystrobin residue in milk.[Methods]A sample was ultrasonically extracted with ace...[Objectives]This study was conducted to establish a liquid chromatography-tandem mass spectrometry method for the determination of coumoxystrobin residue in milk.[Methods]A sample was ultrasonically extracted with acetonitrile,purified by a solid phase extraction column,concentrated by nitrogen blowing,and tested on a machine.[Results]In the range of 0.01-10.00 mg/kg,the linear relationship of coumoxystrobin was good.The linear equation was y=5045.96x+935.332,r^(2)=0.999.The detection limit was 0.002 mg/kg,and the quantitation limit was 0.006 mg/kg.The method has good stability,high precision,and the detection limit can meet the limit requirement of coumoxystrobin in GB 2763-2019.[Conclusions]This study can provide technical support for the supervision and monitoring of coumoxystrobin.展开更多
[Objective] The paper was to screen suitable agents for controlling northern leaf blight of maize in field. [Method] Field efficacy test was conducted using the agents of propiconazole, azoxystrobin, propiconazole...[Objective] The paper was to screen suitable agents for controlling northern leaf blight of maize in field. [Method] Field efficacy test was conducted using the agents of propiconazole, azoxystrobin, propiconazole·azoxystrobin, coumoxystrobin·tebuconazole, coumoxystrobin·tebuconazole and azoxystrobin. [Result] At 14 d post secondary spraying, the control effects of 25% propionazole EC 168.8 g/hm^2, 25% azoxystrobin SC 300 g/hm^2, 18.7% propiconazole·azoxystrobin SC 196.4 g/hm^2, 40% coumoxystrobin·tebuconazole SC 180 m L/hm^2, 40% coumoxystrobin·tebuconazole SC 180 m L/hm^2＋ 25% azoxystrobin SC 300 g/hm^2 against northern leaf blight of maize were 77.35%, 77.11%, 78.13%, 74.60% and 80.94%, re-spectively. The agents were safe and harmless to maize. [Conclusion] Considering the production factors, 18.7% propiconazole·azoxystrobin SC196.4 g/hm^2 or 40% coumoxystrobin·tebuconazole SC 180 m L/hm^2＋ 25% azoxystrobin SC 300 g/hm^2 can be sprayed in production before the incidence or in the initial incidence of northern leaf blight of maize.展开更多
基金Supported by Natural Science Foundation of Hunan Province(2024JJ8259).
文摘[Objectives]This study was conducted to establish a method for determining residual coumoxystrobin in vegetables using QeEChERS-liquid chromatography-tandem mass spectrometry(QeEChERS-LC-MS/MS).[Methods]The sample was extracted by acetonitrile,and the extract was purified by QeEChERS,concentrated by nitrogen blowing,and then detected.[Results]Coumoxystrobin had a good linear relation in the range of 0.01-10.0 mg/kg,and the linear equation was y=4686.92×x+5683.28,R^(2)=0.999.The limit of detection was 0.001 mg/kg,and the limit of quantitation was 0.003 mg/kg.[Conclusions]The method has the advantages of convenient and fast operation and stable detection process,and can provide technical support for the supervision and monitoring of coumoxystrobin.
基金Special Fund for Innovation Capacity Building of Scientific Research Institutions(QKHFQ[2019]4001)Science and Technology Program of Guizhou Province(QKHZC[2019]2451-8-3).
文摘[Objectives]This study was conducted to establish a liquid chromatography-tandem mass spectrometry method for the determination of coumoxystrobin residue in milk.[Methods]A sample was ultrasonically extracted with acetonitrile,purified by a solid phase extraction column,concentrated by nitrogen blowing,and tested on a machine.[Results]In the range of 0.01-10.00 mg/kg,the linear relationship of coumoxystrobin was good.The linear equation was y=5045.96x+935.332,r^(2)=0.999.The detection limit was 0.002 mg/kg,and the quantitation limit was 0.006 mg/kg.The method has good stability,high precision,and the detection limit can meet the limit requirement of coumoxystrobin in GB 2763-2019.[Conclusions]This study can provide technical support for the supervision and monitoring of coumoxystrobin.
基金Supported by National Key Research and Development Program"Scientific and Technological Innovation in Food Production"(2017YFD0300606)Science and Technology Development Project of Jilin Province(20170412029XH)
文摘[Objective] The paper was to screen suitable agents for controlling northern leaf blight of maize in field. [Method] Field efficacy test was conducted using the agents of propiconazole, azoxystrobin, propiconazole·azoxystrobin, coumoxystrobin·tebuconazole, coumoxystrobin·tebuconazole and azoxystrobin. [Result] At 14 d post secondary spraying, the control effects of 25% propionazole EC 168.8 g/hm^2, 25% azoxystrobin SC 300 g/hm^2, 18.7% propiconazole·azoxystrobin SC 196.4 g/hm^2, 40% coumoxystrobin·tebuconazole SC 180 m L/hm^2, 40% coumoxystrobin·tebuconazole SC 180 m L/hm^2＋ 25% azoxystrobin SC 300 g/hm^2 against northern leaf blight of maize were 77.35%, 77.11%, 78.13%, 74.60% and 80.94%, re-spectively. The agents were safe and harmless to maize. [Conclusion] Considering the production factors, 18.7% propiconazole·azoxystrobin SC196.4 g/hm^2 or 40% coumoxystrobin·tebuconazole SC 180 m L/hm^2＋ 25% azoxystrobin SC 300 g/hm^2 can be sprayed in production before the incidence or in the initial incidence of northern leaf blight of maize.
