Determination of Four β2-Agonists Residues in Sausage by Matrix Solid-phase Dispersion and High Performance Liquid Chromatography- Tandem Mass Spectrometry

利用同位素稀释技术,建立了肉肠中4种β2-受体激动剂克伦特罗、莱克多巴胺、沙丁胺醇和特布他林的基质固相分散/高效液相色谱-串联质谱( MSPD/HPLC - MS/MS)分析方法.样品经C1s填料研磨,甲醇洗脱,提取物经酶解后,用MCX小柱净化,经高效液相色谱分离,在正离子多反应监测(MRM)模式下用电喷雾电离串联质谱测定,内标法定量.4种β2-受体激动剂在0.2～20.0 μg/L质量浓度范围内呈良好的线性关系,相关系数(r2)均大于0.990;沙丁胺醇和克伦特罗的检出限为0.10 μg/kg;莱克多巴胺和特布他林的检出限为0.15 μg/kg;方法的回收率为80％～ 109％,相对标准偏差小于10％.该方法简便快捷、灵敏度高,样品和溶剂用量少,可满足肉肠中4种β2-受体激动剂残留的快速检测.     

EXTRACTION OF CITRIC ACID FROM FERMENTATION BROTH USING ION—EXCHANGE METHOD

A number of ion-exchange resins were tested on their capacity to adsorb citric acid,among them resin 335,d315, Amberlite IRA-35 and IRA-68 exhibited higher adsorption capacity.We chose resin 335 and D315 to be used for extraction of citric acid from fermentation broth,followed by elution with 10% ammonia liquor,decoloration with K-15 carbon and removal of ammonia with resin 732,converting citrate of free citric acid with a concentration of 10% and an amount of readily carbonizable substance meeting the GB 8269-87 standard.     

基质固相分散/高效液相色谱-串联质谱法分析肉肠中4种β-2-受体激动剂残留

利用同位素稀释技术,建立了肉肠中4种β2-受体激动剂克伦特罗、莱克多巴胺、沙丁胺醇和特布他林的基质固相分散/高效液相色谱-串联质谱(MSPD/HPLC-MS/MS)分析方法。样品经C18填料研磨,甲醇洗脱,提取物经酶解后,用MCX小柱净化,经高效液相色谱分离,在正离子多反应监测(MRM)模式下用电喷雾电离串联质谱测定,内标法定量。4种β2-受体激动剂在0.2～20.0μg/L质量浓度范围内呈良好的线性关系,相关系数(r2)均大于0.990;沙丁胺醇和克伦特罗的检出限为0.10μg/kg;莱克多巴胺和特布他林的检出限为0.15μg/kg;方法的回收率为80%～109%,相对标准偏差小于10%。该方法简便快捷、灵敏度高,样品和溶剂用量少,可满足肉肠中4种β2-受体激动剂残留的快速检测。