目的:基于QuEChERS方法结合气相色谱串联质谱(Gas Chromatography-Tandem Mass Spectrometry,GC-MS/MS)技术,建立一种简单、快速检测果蔬中农药残留的方法。方法:果蔬样品匀浆后,先用乙腈和乙酸缓冲盐包提取,再用m-PFC小柱净化,最后用GC...目的:基于QuEChERS方法结合气相色谱串联质谱(Gas Chromatography-Tandem Mass Spectrometry,GC-MS/MS)技术,建立一种简单、快速检测果蔬中农药残留的方法。方法:果蔬样品匀浆后,先用乙腈和乙酸缓冲盐包提取,再用m-PFC小柱净化,最后用GC-MS/MS测定,外标法定量。结果:13种农药在10~500μg·L^(-1)浓度范围内线性关系良好,相关系数(R^(2))均大于0.994,检出限为0.35~0.92μg·kg^(-1),定量限为1.0~2.8μg·kg^(-1);13种农药在3个水平下的加标回收率为82.4%~110.1%,相对标准偏差为2.9%~9.3%。结论:所建立的方法可操作性强,具有较高的精密度和准确度,可用于果蔬中农药残留的定性和定量检测。展开更多
针对6种欧盟及日本进出口果蔬中重点检测,但在我国食品安全国家标准中暂无检测标准的农药物质进行研究,建立一种改进的QuEChERS(Quick,Easy,Cheap,Effective,Rugged and Safe)提取净化方法结合气相色谱-串联质谱技术(Gas Chromatography...针对6种欧盟及日本进出口果蔬中重点检测,但在我国食品安全国家标准中暂无检测标准的农药物质进行研究,建立一种改进的QuEChERS(Quick,Easy,Cheap,Effective,Rugged and Safe)提取净化方法结合气相色谱-串联质谱技术(Gas Chromatography-tandem Mass Spectrometry,GC-MS/MS)检测方法,能快速检测叶菜类蔬菜基质中邻苯基苯酚钠、二甲基敌草索等6种农药多残留。样品采用乙腈提取、无水MgSO4与NaCl盐析除水后,经N-丙基乙二胺(PSA)固相材料净化,使用GC-MS/MS在多反应监测模式(Multi Reaction Monitoring,MRM)下分析检测。结果表明:6种农药物质在0.002~0.5μg/mL范围内线性关系良好,相关系数R均大于0.998,方法检出限(RSN=3)为0.15~2.32μg/kg,平均回收率为84.50%~106.23%,相对标准偏差为0.96%~8.35%,此结果均符合欧盟农药残留分析质量控制程序要求与日本和欧盟对农残“一律标准”中农药限量要求。将建立的检测方法应用于其他蔬菜中高发农药物质的检测,检测效果良好。该方法重复性好、耗时短、易操作,为邻苯基苯酚钠、二甲基敌草索等多种农药残留的检测提供了新的检测技术和依据。展开更多
In the first article of this series, we presented some evidence of hyperforin as an antibiotic, antiprotozoal, antiviral, anticancer, and immunomodulatory substance. In the present article, evidence of the permeabilit...In the first article of this series, we presented some evidence of hyperforin as an antibiotic, antiprotozoal, antiviral, anticancer, and immunomodulatory substance. In the present article, evidence of the permeability of the blood-testis barrier (BTB) and blood-brain barrier (BBB) to hyperforin and its distribution in other organs of the domestic pig (Sus scrofa domesticus) are revealed. Seven-month-old male boars with a body mass of 100 kg were fed a diet containing hyperforin. Organs were surgically removed under anesthesia. Organs were suitable prepared and extracted, and then analyzed using gas chromatography-mass spectrometry with supersonic molecular beams (GC-MS with SMB). The presence of hyperforin was recorded in all organs and body fluids. Special attention was paid to the evaluation of the presence of hyperforin in the brain and testes of experimental animals. The presence of hyperforin in the brain and testes of experimental animals was established by GC-MS with SMB. The results are of interest because penicillin and numerous other antibiotics cannot pass through the BTB or BBB if healthy or non-inflamed, which limits their use in patients with meningitis and gonorrhea. The findings are also of interest in cases of penicillin- and multi-antibiotic-resistant bacterial infections.展开更多
文摘目的:基于QuEChERS方法结合气相色谱串联质谱(Gas Chromatography-Tandem Mass Spectrometry,GC-MS/MS)技术,建立一种简单、快速检测果蔬中农药残留的方法。方法:果蔬样品匀浆后,先用乙腈和乙酸缓冲盐包提取,再用m-PFC小柱净化,最后用GC-MS/MS测定,外标法定量。结果:13种农药在10~500μg·L^(-1)浓度范围内线性关系良好,相关系数(R^(2))均大于0.994,检出限为0.35~0.92μg·kg^(-1),定量限为1.0~2.8μg·kg^(-1);13种农药在3个水平下的加标回收率为82.4%~110.1%,相对标准偏差为2.9%~9.3%。结论:所建立的方法可操作性强,具有较高的精密度和准确度,可用于果蔬中农药残留的定性和定量检测。
文摘针对6种欧盟及日本进出口果蔬中重点检测,但在我国食品安全国家标准中暂无检测标准的农药物质进行研究,建立一种改进的QuEChERS(Quick,Easy,Cheap,Effective,Rugged and Safe)提取净化方法结合气相色谱-串联质谱技术(Gas Chromatography-tandem Mass Spectrometry,GC-MS/MS)检测方法,能快速检测叶菜类蔬菜基质中邻苯基苯酚钠、二甲基敌草索等6种农药多残留。样品采用乙腈提取、无水MgSO4与NaCl盐析除水后,经N-丙基乙二胺(PSA)固相材料净化,使用GC-MS/MS在多反应监测模式(Multi Reaction Monitoring,MRM)下分析检测。结果表明:6种农药物质在0.002~0.5μg/mL范围内线性关系良好,相关系数R均大于0.998,方法检出限(RSN=3)为0.15~2.32μg/kg,平均回收率为84.50%~106.23%,相对标准偏差为0.96%~8.35%,此结果均符合欧盟农药残留分析质量控制程序要求与日本和欧盟对农残“一律标准”中农药限量要求。将建立的检测方法应用于其他蔬菜中高发农药物质的检测,检测效果良好。该方法重复性好、耗时短、易操作,为邻苯基苯酚钠、二甲基敌草索等多种农药残留的检测提供了新的检测技术和依据。
文摘In the first article of this series, we presented some evidence of hyperforin as an antibiotic, antiprotozoal, antiviral, anticancer, and immunomodulatory substance. In the present article, evidence of the permeability of the blood-testis barrier (BTB) and blood-brain barrier (BBB) to hyperforin and its distribution in other organs of the domestic pig (Sus scrofa domesticus) are revealed. Seven-month-old male boars with a body mass of 100 kg were fed a diet containing hyperforin. Organs were surgically removed under anesthesia. Organs were suitable prepared and extracted, and then analyzed using gas chromatography-mass spectrometry with supersonic molecular beams (GC-MS with SMB). The presence of hyperforin was recorded in all organs and body fluids. Special attention was paid to the evaluation of the presence of hyperforin in the brain and testes of experimental animals. The presence of hyperforin in the brain and testes of experimental animals was established by GC-MS with SMB. The results are of interest because penicillin and numerous other antibiotics cannot pass through the BTB or BBB if healthy or non-inflamed, which limits their use in patients with meningitis and gonorrhea. The findings are also of interest in cases of penicillin- and multi-antibiotic-resistant bacterial infections.
