高效液相色谱-二极管阵列检测法同时分析兽药粉剂中11种磺胺类药物

建立了高效液相色谱-二极管阵列检测法同时测定兽药粉剂中11种磺胺类药物的分析方法。试样采用95%乙腈提取,经碱性氧化铝固相萃取小柱净化,15%乙腈复溶残渣后用Agilent TC-C18色谱柱分离,0.017 mol/L磷酸溶液和乙腈为流动相进行梯度洗脱,二极管阵列检测器进行检测。结果表明,在优化实验条件下,11种磺胺类药物的色谱分离和相应光谱图匹配理想;在0.25～10.0 mg/L范围内线性关系良好;兽药粉剂中添加0.5～5.0 mg/kg水平的11种磺胺类药物的回收率在67%～97%之间,相对标准偏差为1.5%～9.9%;以3倍信噪比(S/N=3)结合相应光谱图计算得11种磺胺类药物的检出限均为0.25 mg/kg。     

固相萃取-高效液相色谱法测定鸡肝中磺胺类药物残留量

建立了一种鸡肝中7种磺胺类药物残留量固相萃取-反相高效液相色谱分析方法。对样品提取后磺胺类药物在氨基键合固相萃取柱上的保留行为进行了研究。采用Intersil ODS-3 C18柱,以甲醇-乙腈冰．乙酸为流动相梯度洗脱,进行高效液相色谱分离,二极管阵列检测器检测,外标法定量。7种磺胺类药物标准曲线的线性回归系数均在0．999以上,线性范围为25—10000μg／L;检出限在8—12μ／kg之间;在50、100、200μg／kg^3个添加浓度水平下添加回收率在69．6％-91．3％范围内;相对标准偏差在4．3％-8．0％之间。该方法具有快速、灵敏、环保的特点,符合现行兽药残留分析的要求。     

固相萃取-高效液相色谱法测定畜牧粪便中13种抗生素药物残留

建立了固相萃取-反相高效液相色谱法测定畜牧粪便中5种磺胺类、4种四环素类、2种喹诺酮类以及氯霉素和呋喃唑酮的检测方法.采用乙腈和0.01 mol/L草酸作为流动相分离4种四环素类和氯霉素,乙腈和0.025 mol/L醋酸铵作为流动相分离5种磺胺类和其它3种抗生素.结果表明,检测的13种抗生素出峰时间稳定,峰形较好,检出限0.01～0.05 mg/L,定量下限0.03～0.167 mg/L,采用柠檬酸缓冲液酸化的乙腈对猪粪便样品前处理,采用EDTA-McIlvaine提取液对鸡粪便样品前处理,两类样品均通过HLB固相萃取小柱纯化富集,回收率为54%～103%.该方法成功用于天津市4个畜牧养殖基地的20个畜牧粪便样品中抗生素的检测.结果表明,均有不同浓度的抗生素检出,浓度范围0.3～173 mg/kg.     

固相萃取-高效液相色谱法同时测定牛奶中13种磺胺残留

建立了固相萃取-高效液相色谱同时测定牛奶中13种磺胺类药物残留的方法。样品经乙腈溶液漩涡超声提取后,采用自制碱性氧化铝固相萃取小柱(SPE)净化,洗脱液减压浓缩至近干后用流动相溶解并定容,过PTFE滤膜后在Thermo Fisher Scientific ODS hypersil色谱柱上,以乙腈-20 mmol/L H3PO4溶液为流动相进行梯度洗脱,检测波长为270 nm。13种磺胺在50~5000μg/L范围内具有良好的线性,相关系数≥0.999,检出限为2.0~4.2μg/L,定量限为8.9~14.2μg/L。在20,50,100μg/L添加水平的加标回收率为79.0%~118.2%,相对标准偏差在2.7%~6.9%之间。方法能对牛奶中13种磺胺类药物残留实现准确定量分析。     

高效液相色谱法同时检测蜂蜜中的5类抗生素残留

建立了蜂蜜中氯霉素类、硝基咪唑类、喹诺酮类、磺胺类、四环素类5类共15种抗生素残留同时检测的高效液相色谱分析方法.蜂蜜经pH 2.0的磷酸水溶液溶解后直接用PCX固相萃取小柱净化富集,以乙腈-磷酸溶液(pH 2.5)作流动相,梯度洗脱,紫外检测器在274、315 nm波长下进行检测.15种抗生素在0.2 ～20.0 m...     

固相萃取-高效液相色谱法测定水中磺胺类药物

提出了固相萃取-高效液相色谱法测定水中3种磺胺类药物(磺胺甲噁唑、磺胺异噁唑和磺胺间甲氧嘧啶)的方法。水样经自制的阳离子交换固相萃取柱净化和富集后,以C18色谱柱(250mm×4.6mm,5μm)为固定相,以乙腈和2%(体积分数)乙酸溶液以体积比1比5的混合液为流动相进行分离,在波长270nm处用紫外检测器测定。3种磺胺类化合物的质量浓度均在0.005～0.5mg.L-1之间与其峰面积呈线性关系,方法检出限(3S/N)在2.4～3.7μg.L-1之间。方法用于水样中上述3种磺胺类化合物的测定,测定值的相对标准偏差(n=6)在2.6%～4.4%之间,加标回收率在88.6%～103%之间。     

固相萃取-HPLC法测定蜂蜜中残留的10种磺胺类药物

研究了用固相萃取-高效液相色谱法同时测定蜂蜜中10种磺胺类药物残留量的方法。样品经三氯甲烷溶液提取,过Oasis HLB C18固相萃取柱净化,用乙腈洗脱10种磺胺,反相高效液相色谱-紫外检测器测定。检测波长为270nm,柱温45℃．流动相：磷酸水溶液-乙腈梯度洗脱．该方法前处理简单,梯度洗脱分离效果和重现性好,在0．010～1．0mg／kg添加水平,10种组分的回收率在86．5％～100．8％之间,室内相对标准偏差在3．5％～8．1％之间,线性范围为0．010～10μg／mL,检出限为0．005mg／kg。该方法快速、灵敏、专属,可用于食品中磺胺类药物残留量的常规检测。     

高效液相色谱法测定水和土壤中磺胺类抗生素

建立了固相萃取(SPE)-高效液相色谱法(HPLC)同时测定水和土壤中5种磺胺类抗生素的分析方法。水样过滤后采用HLB固相萃取柱净化、富集;土样采用甲醇/EDTA-Mcllvaine缓冲液提取,LC-SAX和LC-18串联固相萃取小柱净化富集;采用高效液相色谱,以乙腈和0.01mol/LH3PH4作为流动相,于270nm波长处对样品进行检测。5种抗生素在水和土壤中的检出限分别为0.94～13.2ng/L和0.24～3.3μg/kg;加标回收率分别为81.0～105.5%和72.6%～85.3%。采集了不同菜地土壤和污水处理厂水样,用上述方法进行了检测,表明本方法对环境样品中磺胺类抗生素的检测是可行的,污水厂进水和菜地土壤中磺胺类抗生素总浓度分别为2.26～12.12ng/L和53.68～155.24μg/kg。     

分散固相萃取-超高效液相色谱-串联质谱法测定海龙中11种磺胺类抗菌药物残留

采用超高效液相色谱串联三重四极杆质谱(UPLC-MS/MS)技术,建立了测定海龙中11种磺胺类抗菌药物残留量的分析方法.样品经2%甲酸-乙腈超声提取,增强型脂质去除分散固相萃取净化管(EMR-Lipid dSPE)净化,采用Waters ACQUITY BEH C 18色谱柱(1.7µm,2.1 mm×100 mm)分离,电喷雾离子源电离,正离子多反应监测模式(MRM)检测,以含2 mmol/L乙酸铵-0.1%甲酸的水溶液和含0.1%甲酸的乙腈溶液为流动相进行梯度洗脱,外标法定量.11种磺胺类抗菌药物在0~30 ng/mL的质量浓度范围内线性关系良好,相关系数(R2)均不低于0.9959,检出限(LOD)与定量限(LOQ)分别在0.11~1.30µg/kg和0.37~4.40µg/kg之间,11种磺胺类抗菌药物在质量浓度为20.0、50.0、100.0µg/kg时的三个加标水平的平均回收率为62.5%~118.1%,相对标准偏差为2.1%~9.2%.方法前处理简便、准确性好,可用于海龙中11种磺胺类抗菌药物残留的快速筛查.     

磁性高交联聚苯乙烯-纳米Fe_3O_4的制备及其在牛奶中磺胺类药物检测中的应用

制备了磁性超高交联聚苯乙烯(HCP)-纳米Fe_3O_4微球,作为固相萃取材料,对牛奶中的4种磺胺类药物:磺胺甲氧嗪、磺胺甲嘧啶、磺胺甲恶唑、磺胺氯哒嗪进行预富集处理后,经C18反相液相色谱柱分离,以乙腈-0.1%H_3PO_4溶液(20:80,V/V)为流动相进行洗脱检测。4种磺胺类药物在0.2~10 ng/m L范围内呈良好的线性关系,相关系数均不小于0.98,检出限为0.022~0.068 ng/m L,平均回收率为94%~105%,相对标准偏差为2.1%~4.3%。方法已用于实际样品中磺胺类药物的定量分析。     

Determination of 19 sulfonamides residues in pork samples by combining QuEChERS with dispersive liquid–liquid microextraction followed by UHPLC–MS/MS

A new simple and rapid pretreatment method for simultaneous determination of 19 sulfonamides in pork samples was developed through combining the QuEChERS method with dispersive liquid–liquid microextraction followed by ultra‐high performance liquid chromatography with tandem mass spectrometry. The sample preparation involves extraction/partitioning with QuEChERS method followed by dispersive liquid–liquid microextraction using tetrachloroethane as extractive solvent and the acetonitrile extract as dispersive solvent that obtained by QuEChERS. The enriched tetrachloroethane organic phase by dispersive liquid–liquid microextraction was evaporated, reconstituted with 100 μL acetonitrile/water (1:9 v/v) and injected into an ultra‐high performance liquid chromatography with a mobile phase composed of acetonitrile and 0.1% v/v formic acid under gradient elution and separated using a BHE C₁₈ column. Various parameters affecting the extraction efficiency were investigated. Matrix‐matched calibration curves were established. Good linear relationships were obtained for all analytes in a range of 2.0–100 μg/kg and the limits of detection were 0.04–0.49 μg/kg. Average recoveries at three spiking levels were in the range of 78.3–106.1% with relative standard deviations less than 12.7% (n = 6). The developed method was successfully applied to determine sulfonamide residues in pork samples.     

Determination of β-Blockers in Bovine and Porcine Tissues and Bovine Milk by High-Performance Liquid Chromatography – Tandem Mass Spectrometry

The illicit use of β-blockers in food-producing animals may induce the presence of these compounds in meat and milk. The presence of β-blockers in these foods is a safety issue. A simple and economic high-performance liquid chromatography – tandem mass spectrometry method was developed and validated for β-blockers in bovine and porcine muscle, kidney, liver, and bovine milk. The focus of the study was on the detection and quantitation of acebutolol, atenolol, betaxolol, carazolol, metoprolol, nadolol, penbutolol, and propranolol. Homogenized tissues were digested with glucuronidase/aryl sulfatase to release the analytes that were extracted with acetonitrile and purified using matrix solid-phase dispersion. For residues in milk, acidolysis and extraction utilized trichloroacetic acid and acetonitrile and the samples were purified using mixed-mode cation exchange solid phase extraction. Standard curves generated using homogenized tissues and milk matrices were linear with correlation coefficients exceeding 0.99. The limits of detection and quantification were 1?μg/kg and 2.5?μg/kg, respectively, for all analytes in the meat tissues. The corresponding values for milk were 0.2?μg/kg and 0.5?μg/kg. The average recoveries of the spiked samples were from 84.4 to 114.2% with the standard deviations of the intra- and inter-day assays from 2.0 to 14.6% and 2.9 to 18.7%, respectively. This method is simple, economical, and time-saving for the determination of β-blockers in bovine tissue, porcine tissue, and bovine milk.     

QuEChERS-超高效液相色谱-串联质谱法测定牛奶中6种头孢菌素类抗生素残留

建立了QuEChERS-超高效液相色谱-串联质谱（UPLC-MS/MS）同时测定牛奶中6种头孢菌素类抗生素的分析方法。牛奶样品加入含1%（v/v）醋酸的乙腈溶液提取,于45℃氮吹浓缩,经100 mg C18吸附剂净化后,采用HSS T3柱（100 mm×2.1 mm,1.8 μm）分离,以0.1%（v/v）甲酸水溶液和乙腈为流动相进行梯度洗脱,在电喷雾离子源、正离子模式（ESI⁺）下电离,多反应监测（MRM）模式下检测,外标法定量。结果表明,6种头孢菌素类抗生素在2~200 μg/L质量浓度范围内均呈良好的线性关系,相关系数（r）均大于0.999,方法的检出限为0.2~0.6 μg/kg、定量限为0.8~2.0 μg/kg。在8、16和80 μg/kg的加标水平下,6种头孢菌素类抗生素的回收率为75.1%~94.4%,相对标准偏差为0.63%~8.3%。该方法简单快捷,准确可靠,适用于牛奶中头孢菌素类抗生素残留的同时测定。     

Development of multiple monolithic fiber solid‐phase microextraction and liquid chromatography–tandem mass spectrometry method for the sensitive monitoring of aminoglycosides in honey and milk samples

A simple and sensitive method for the simultaneous extraction and determination of six aminoglycosides in honey and milk samples was developed using multiple monolithic fiber solid‐phase microextraction and liquid chromatography with tandem mass spectrometry. The multiple monolithic fibers based on poly(methacrylic acid‐co‐ethylenedimethacrylate) monolith as the extraction medium was used to concentrate target analytes. Because there were abundant carboxyl groups in the monolith, the monolithic fibers could extract aminoglycosides effectively through cation‐exchange and hydrophobic interactions. To obtain optimum extraction performance, several extraction parameters including desorption solvent, adsorption and desorption time, pH value and ionic strength in sample matrix, were investigated in detail. Under the optimized extraction conditions, the limits of detection of the proposed method were 0.10–0.30 and 0.23–0.59 μg/kg for honey and milk samples, respectively. Satisfactory linearity was achieved for analytes with the coefficients of determination above 0.99. At the same time, the developed method showed acceptable method repeatability and reproducibility. Finally, the proposed method was successfully applied to the determination of aminoglycosides in real honey and milk samples. Recoveries obtained for the determination of six target analytes in spiking samples ranged from 67.9 to 110%, and the relative standard deviations were in the range of 1.2–11%.     

气相色谱法测定土壤中酰胺类除草剂

建立了从土壤中同时提取甲草胺、乙草胺和丁草胺并采用气相色谱法测定的分析方法。采用丙酮-石油醚(2:1,V/V)为提取液,经弗罗里矽硅土固相萃取柱净化,超声30 min、振荡10 min。测定结果显示,甲草胺、乙草胺、丁草胺的保留时间分别为16.333,16.019,20.249 min;线性相关系数>0.9990;6个平行样品在0.10,0.50,0.90 mg/kg的添加水平回收率在84.9%~101.0%之间;对3种酸碱度不同的土壤样品进行了重复测定,得到相对标准偏差(RSD)在0.88%~4.3%之间。方法的检出限分别为甲草胺300 ng/kg,乙草胺400 ng/kg,丁草胺400 ng/kg。定量限分别为甲草胺3.3μg/kg,乙草胺3.9μg/kg,丁草胺3.9μg/kg。方法可同时检测土壤中甲草胺、乙草胺、丁草胺残留量。     

固相萃取-高效液相色谱-串联质谱法同时测定牛奶和羊奶中莫奈太尔及其代谢产物残留

建立了高效液相色谱-串联质谱快速测定牛奶和羊奶中莫奈太尔及其代谢产物残留量的分析方法。样品经乙腈沉淀蛋白质,中性氧化铝固相萃取柱净化,以Inertsil C8-3（150 mm×4.6 mm,5 μm）色谱柱分离,甲醇-乙酸铵溶液为流动相进行梯度洗脱,采用电喷雾负离子监测模式检测,外标法定量。结果表明,在0.1~5.0 μg/L范围内,待测物色谱峰面积与其质量浓度间的线性关系良好（相关系数均大于0.99）,定量限为2.0 μg/kg。莫奈太尔及其代谢产物在2类基质中3个水平（2.0、50和100 μg/kg）下的加标回收率为90.1%~103.3%,相对标准偏差（RSD）为2.0%~6.2%（n=6）。该方法操作简便、快速,灵敏度高,抗干扰能力强,回收率和重复性良好,能够满足牛奶和羊奶中莫奈太尔及其代谢产物残留量的检测要求。     

QuEChERS结合液相色谱-串联质谱法快速测定猪肉中多类兽药残留

采用改进的QuEChERS方法提取和净化猪肉样品,建立了同时测定磺胺类、磺胺类增效剂、β-受体激动剂、四环素类、喹诺酮类、金刚烷胺和性激素共7类35种兽药残留的液相色谱-串联质谱（LC-MS/MS）检测方法。样品经 Na₂EDTA（乙二胺四乙酸）-Mcllvaine缓冲液-2.5%（体积分数）乙酸乙腈溶液提取,提取液经盐析后取乙腈相,用氨基（NH₂）吸附剂分散固相萃取净化后,在电喷雾离子源正离子多反应监测（MRM）模式下进行测定,基质外标法定量。35种兽药在1.0～50.0 μg/L范围内线性关系良好,相关系数均大于0.996。在3个不同添加水平下的平均回收率为71.8%～113.5%,相对标准偏差为0.6%～9.8%（n=6）,检出限和定量限分别为0.01～1.01 μg/kg和0.04～3.37 μg/kg。该方法操作简单,净化效果好,灵敏度高,适用于猪肉中兽药多残留的同时快速定性、定量分析。     

多壁碳纳米管固相萃取技术同时测定蜂蜜中多类兽药残留

采用多壁碳纳米管固相萃取-超高效液相色谱-串联质谱技术同时测定蜂蜜中的磺胺类、喹诺酮类、硝基咪唑类和四环素类等52种兽药残留. 样品用Na₂EDTA-Mcllvaine提取,经改性的多壁碳纳米管固相萃取小柱净化,通过Waters C₁₈色谱柱分离,以乙腈和0.1%（体积分数）的甲酸水溶液为流动相进行梯度洗脱,采用电喷雾-正离子多反应监测的质谱模式,以基质外标法进行定量分析. 实验结果表明,52种兽药在相应的浓度范围内线性相关系数均大于0.99,该方法的定量限为1.5 ~7.5 μg/kg. 在7.5,25和50 μg/kg 3个浓度添加水平下,各种兽药的回收率为67.3% ~117.8%,相对标准偏差为1.9% ~17.4%. 结果表明,多壁碳纳米管固相萃取材料具有较好的净化效果,适用于蜂蜜中多类兽药残留的同时检测.     

超高效液相色谱-串联质谱法测定猪肉、鸡蛋、牛奶中9种食源性兴奋剂类药物残留

β-受体激动剂、β-阻断剂、蛋白同化制剂属于兴奋剂类药物,在动物饲养和屠宰过程中的违禁使用成为食源性兴奋剂类药物残留的来源,危害人类健康.目前 β-受体激动剂、蛋白同化制剂的检测较多,β-阻断剂检测报道较少,动物源食品中 β-阻断剂检测尚无标准方法.该文建立了超高效液相色谱-串联质谱测定猪肉、鸡蛋、牛奶中 β-受体激动...