SPE-GC/MS法测定植物油中16种邻苯二甲酸酯类化合物

目的:建立快速准确地测定植物油中16种邻苯二甲酸酯的检测方法。方法:采用不含邻苯二甲酸酯的CleanertPAE玻璃固相萃取小柱(SPE法)进行前处理,通过气相色谱-质谱法(GC-MS)法进行定性和定量测定。实验结果表明,该方法净化效果较好,处理方法快速、准确、重复性好,克服了普通固相萃取柱处理样品空白值高,凝胶渗透色谱(GPC)法处理样品时间长、空白值较高等不足。     

亲水作用色谱-串联质谱同时测定原料乳和液体乳中三聚氰胺和舒巴坦

建立了亲水作用色谱-串联质谱同时测定原料乳和液体乳中三聚氰胺和舒巴坦的分析方法。试样采用2%乙酸水溶液提取,经乙腈沉淀蛋白,以乙腈-乙酸铵溶液为流动相,经Acquity UPLC BEH HILIC色谱柱分离后,采用多反应监测（MRM）扫描,外标法定量。三聚氰胺定量下限为10μg/kg,加标回收率为85.4%¹02.5%,相对标准偏差为3.10%⁶.55%。舒巴坦检定量下限为1.0μg/kg,加标回收率为86.1%¹04.3%,相对标准偏差为2.35%⁵.37%。该方法前处理简便快捷,灵敏度高,回收率和重现性良好,适用于原料乳和液体乳中三聚氰胺和舒巴坦的测定。      

凝胶渗透色谱—气相色谱/质谱法测定塑料桶装食用油中四种邻苯二甲酸酯

建立用凝胶渗透色谱净化―气相色谱/质谱分析塑料桶装食用油中四种邻苯二甲酸酯类增塑剂方法。样品用环己烷―乙酸乙酯(体积比为1∶1)稀释,稀释液经Bio–Bead S–X3凝胶柱净化后,采用气相色谱―质谱在选择离子检测(SIM)模式下进行定性定量分析;结果表明,四种增塑剂在0.1 mg/L~5 mg/L范围内线性关系良好;在空白油样中添加四种增塑剂(添加水平为0.5 mg/kg、5 mg/kg、10 mg/kg)混合标准溶液,平均回收率为85.7%~108.2%,相对标准偏差为3.8%~9.2%,检出限为0.1 mg/kg~0.2 mg/kg。     

气相色谱高分辨飞行时间质谱法快速筛查水果中283种农药残留

目的建立气相色谱高分辨飞行时间质谱法(gas chromatography time-of-flight mass spectrometry,GC-TOF/MS)快速筛查水果中283种农药残留量的分析方法。方法利用气相色谱高分辨飞行时间质谱结合MassHunter、PCDL软件建立283种农药的EI精确质量谱库,试样经QuEChERS方法进行萃取净化后,采用EI全扫描监测,通过PCDL谱库全离子筛查模式检索,以保留时间、特征离子精确质量数、分子离子同位素信息等作为定性依据。由谱库选择质量数较大、丰度比较高的精确质量离子为定量离子,进行定量测定。结果在空白苹果、葡萄、橙3种水果中添加10、20、40μg/kg 3个浓度水平下,方法的平均回收率65.9%～129.1%,相对标准偏差(relative standard deviation,RSD)2.8%～11.6%,方法的最低检出浓度可达0.5～10μg/kg。结论该方法简便、快速、灵敏、精密度好,是水果中常见农药残留有效快速筛查技术。     

Analysis of vinylidene chloride and 1-chlorobutane in foods packaged with polyvinylidene chloride casing films by headspace gas chromatography/mass spectrometry (GC/MS)

A headspace gas chromatography/mass spectrometry method was developed for the simultaneous determination of vinylidene chloride and 1-chlorobutane in foods packaged with polyvinylidene chloride casing films. The solid foodstuff was homogenized with an equal mass of distilled water. The homogenate was incubated for 1 h at 90°C in a sealed headspace vial, and the headspace gas was then analysed by gas chromatography/mass spectrometry in selected ion-monitoring mode using a bonded porous polymer-coated capillary column. The recovery rates of vinylidene chloride and 1-chlorobutane in foodstuffs were 94.5-103.9 and 85.8-120.3%, respectively. Among 13 samples tested, vinylidene chloride was detected at 0.001-0.020 µg g^-1 in 11 foodstuffs, and 1-chlorobutane was detected at 0.004-0.040 µg g^-1 in all 13 foodstuffs. Furthermore, vinylidene chloride was detected at 0.04 µg g^-1 in one casing film, and 1-chlorobutane was detected in all casing films. The results indicate that these compounds migrated from the casing films into the foodstuffs.     

液液萃取—接受相固化—反萃取—气相色谱/质谱法测定奶粉中的香兰素

建立液液萃取—接受相固化—反萃取技术联用气相色谱/质谱法检测奶粉中香兰素的新方法。该方法选用乙醚为提取剂,0.01 mol/L 100μL氢氧化钠溶液为接受相,二氯甲烷为反萃取剂,采用GC—MS测定,选择离子监测(SIM)模式,外标法定量。结果表明,在优化试验条件下,方法的线性范围为0.20~10.0"g/m L,相关系数为0.999 5,检出限为(S/N=3)0.004 mg/kg。应用该方法分析实际样品,加标回收率为82.0%~98.0%,相对标准偏差(RSD)2.83%~6.83%。该法简便、快速、准确和灵敏度好,适用于奶粉中香兰素含量的检测。     

Surveillance study of novobiocin and phenylbutazone residues in raw bovine milk using liquid chromatography-tandem mass spectrometry

A simple method permitting the simultaneous determination of trace residues of novobiocin and phenylbutazone in raw milk samples using liquid chromatography-tandem mass spectrometry was developed. Raw milk samples were mixed with acetonitrile to facilitate the concurrent precipitation of milk proteins and extraction of both veterinary drugs. Without additional clean-up or concentration of the resulting extract, the analytes could be quantified at concentrations as low as 0.0025 and 0.001 µg ml^?1 for phenylbutazone and novobiocin, respectively. The analysis of a series of fortified raw milk samples at analyte concentrations ranging from 0.005 to 0.1 µg ml^?1 and from 0.01 to 0.2 µg ml^?1 for phenylbutazone and novobiocin, respectively, yielded average recoveries ranging from 89.2% to 104.3% with standard deviations below 7%. The analytical method was applied to the analysis of raw milk samples collected from transport trucks upon delivery at dairy-processing plants throughout Alberta, Canada. Novobiocin was detected in 13 of 1072 samples tested at concentrations ranging from 0.001 to 0.007 µg ml^?1. Phenylbutazone was not detected in any of the samples tested.     

吹扫捕集-气相色谱/质谱法测定纺织品中多种异味物质

建立了气相色谱/质谱联用法测定纺织品中多种异味物质的方法.样品经吹扫、捕集及热脱附后,用气相色谱/质谱联用仪(GC/MS)测定,采用外标法定量.对GC/MS的仪器条件、吹扫捕集器(P&T)影响因素(吹扫时间和温度、吹扫流速、脱附条件等)、基质效应、样品量等条件进行优化.在最佳实验条件下,10种异味物质的质量分数与峰面积...     

液相色谱-串联质谱法测定发酵乳中爱德万甜的含量

目的建立液相色谱-串联质谱法(liquid chromatography tandem mass spectrometry,LC-MS-MS)测定发酵乳中爱德万甜含量的方法。方法样品经1%高氯酸水溶液超声提取,提取液通过Oasis HLB固相萃取柱净化,经Agilent Zorbax XDB C_(18)色谱柱分离,流动相0.1%甲酸水溶液和乙腈洗脱,然后采用电喷雾串联质谱进行定性和定量分析。结果爱德万甜在5~200μg/L浓度范围内线性关系良好,相关系数大于0.99,爱德万甜的检出限(S/N=3)为1.5μg/kg,定量限(S/N=10)为5.0μg/kg,在5.0~500.0μg/kg的加标范围内,回收率为92.1%~101.6%,相对标准偏差为2.57%~4.56%。结论本方法前处理简单、灵敏度高,适用于发酵乳中爱德万甜含量的测定。     

液相色谱-串联质谱法测定牛奶和奶粉中6种大环内酯类药物的残留量

建立了液相色谱串联质谱测定牛奶和奶粉中6种大环内酯类药物(螺旋霉素、吡利霉素、竹桃霉素、替米卡星、红霉素和泰乐菌素)残留量的分析方法。采用乙腈提取目标物,OasisHLB固相萃取柱净化提取液,液相色谱-串联质谱测定,外标法定量。牛奶中6种大环内酯类药物的检测低限(LOQ)为1μg/kg,奶粉的LOQ为8μg/kg。6种分析物在0～100μg/L的浓度范围内呈良好线性,线性相关系数>0.992。方法在三个水平的添加回收率在81.5%～96.1%之间,相对标准偏差在3.29%～9.96%之间。方法回收率高、重现性好,适用于牛奶、奶粉等样品中大环内酯类药物残留的定量及确证检测。     

凝胶渗透色谱-高效液相色谱-串联质谱法测定 食品中邻苯二甲酸酯类化合物的含量

目的建立同时测定食品中6种邻苯二甲酸酯类化合物含量的高效液相色谱-串联质谱方法(HPLC-MS/MS)。方法以Agilent ZORBAX SB-C18色谱柱为分析柱,以甲醇-0.1%甲酸水为流动相,采用梯度洗脱模式,流速为0.35 m L/min;质谱离子源的工作模式为正离子电离模式(ESI+),采用多反应监测离子模式(MRM)进行定量检测;样品用有机溶剂提取,凝胶渗透色谱净化。结果食品中邻苯二甲酸丁苄酯等6种增塑剂在线性范围内线性关系良好(r20.999),定量限为0.04~0.2μg/kg,检测限为0.01~0.04μg/kg。方法的加标回收率为81.9%~103.9%,相对标准偏差均小于7.2%。结论本文所建立的方法简单,灵敏度高,适用于食品中的6种邻苯二甲酸酯类增塑剂的分析检测。     

QuEChERS结合GC-MS法快速检测酿酒玉米中14种邻苯二甲酸酯类塑化剂

建立了QuEChERS结合气相色谱-质谱法(GC-MS)快速检测玉米中14 种邻苯二甲酸酯类塑化剂(PAEs)的方法。样品经乙腈溶液提取,无水硫酸镁和氯化钠盐析后,经N-丙基乙二胺(PSA)填料、十八烷基键合硅胶(C₁₈)及石墨炭黑(GCB)净化,采用选择离子模式,外标法定量。结果表明:14 种PAEs在1~500 μg/L范围内,采用基质匹配法绘制标准曲线,线性良好,相关系数在0.9945~0.9995之间;在15、150、500 μg/kg的加标水平下,平均回收率为80.0%~109.8%,相对标准偏差均小于9.0%;检出限(S/N=3)与定量限(S/N=10)分别为0.1~2.5和0.13~5.0 μg/kg。将该方法应用于6 个不同产地的玉米原料检测,结果显示:样品中检出邻苯二甲酸二甲酯、邻苯二甲酸二乙酯、邻苯二甲酸二异丁酯、邻苯二甲酸二丁酯和邻苯二甲酸二(2-乙基)己酯此5种塑化剂,且塑化剂含量均低于国标限量标准。该方法高效、快速、灵敏度高,适合于玉米样品的日常监测。     

索氏提取-气相色谱/质谱法测定食品包装材料中羟基苯醚

目的 建立一种适用于食品包装材料中羟基苯醚的气相色谱/质谱检测方法。方法 采用索氏提取法, 以二丙醚萃取提取样品中二苯醚类物质, 经色谱分离后采用质谱检测器, 保留时间、分子碎片峰定性, 外标法定量。结果 对于二苯醚类物质检测回收率范围88%~109%, 相对标准偏差<3.9, 检测限0.032 ~0.067mg/L。结论 本方法便捷、重现性好, 适用于各种类型食品包装材料中二苯醚类物质检测。     

气相色谱-串联质谱法测定速溶茶粉中的9,10蒽醌

目的建立气相色谱-串联质谱法(gas chromatography tandem mass spectrometry,GC-MS/MS)测定茶粉中9,10蒽醌残留的检测方法。方法样品经过丙酮-正己烷(1:4,V:V)提取,弗罗里硅土SIPE小柱净化,GC-MS/MS选择离子监测模式(selective reaction monitoring,SRM)进行测定,内标法定量。结果在0.02~0.2 mg/kg加标水平下,9,10蒽醌的回收率为91.2%~119.7%,相对标准偏差(relative standard deviations,RSD)在2.14%-6.18%,定量限(limit of quantitation,LOQ)为0.02 mg/kg。结论该方法快速简便、检出限低、灵敏度高、抗干扰性强、节省有机溶剂,适用于速溶茶粉中9,10蒽醌检测。     

气相色谱-串联质谱法测定婴幼儿配方乳粉中的丙烯酰胺

目的 建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)测定婴幼儿配方乳粉中丙烯酰胺.方法 样品经水溶解后,用乙酸锌、亚铁氰化钾沉淀蛋白,离心,上清液经溴化衍生,乙酸乙酯提取,采用气相色谱-串联质谱法进行检测,内标法定量.结果 丙烯酰胺在...     

Determination of aflatoxin M1 in milk by triple quadrupole liquid chromatography-tandem mass spectrometry

A sensitive and reliable method using liquid chromatography-tandem mass spectrometry (LC-MS/MS) with an electrospray-positive ionization method was developed for the determination of aflatoxin M₁ in milk. This method includes simple extraction of the sample with acetonitrile by ultrasonic, separation on an MGIII-C₁₈ column using 0.01% formic acid buffer/acetonitrile (60 : 40, v/v) as mobile phase, and MS/MS detection using multiple reaction-monitoring mode. Average recoveries of aflatoxin M₁ from spiked samples at concentrations of 0.02 and 1 ng ml^?1 ranged from 77% to 94%, with a 6% relative standard deviation. The limit of detection and limit of quantification were 0.006 and 0.02 ng ml^?1, respectively. The standard curve was linear between 0.02 and 20.0 ng ml^?1. The recommended method is simple, rapid, specific and reliable for the routine monitoring of aflatoxin M₁ in milk.     

邻苯二甲酸二（2-乙基己基）酯在青春期小鼠体内的代谢动力学研究

研究邻苯二甲酸二（2-乙基己基）酯（di-（2-ethylhexyl）phthalate,DEHP）在青春期小鼠体内的代谢动力学,以300 mg/kg DEHP灌胃青春期小鼠,血清样品经固相萃取（solid phase extraction,SPE）提取和净化,气相色谱-质谱联用（gas chromatography-mass spectrometry,GC-MS）法测定不同时间点的血药质量浓度,以3p97软件拟合其动力学参数。DEHP在青春期小鼠体内的主要药物代谢动力学参数：药峰质量浓度ρmax为（0.476±0.028） μg/mL,达峰时间Tpeak为（2.539±0.424） h,药-时曲线下面积AUC（0-t）为（32.209±11.220） h•μg/mL,分布半衰期t1/2α为（1.886±0.480） h,消除半衰期t1/2β为（36.473±8.324） h。本方法简便快捷,其灵敏度和准确度均可满足青春期小鼠体内DEHP代谢动力学研究。DEHP在青春期小鼠体内药物代谢动力学过程符合一级吸收二室开放模型,其分布较快,代谢较慢。     

气相色谱-串联质谱法测定不同酒类食品中17种邻苯二甲酸酯

目的 建立酒类食品中17种邻苯二甲酸酯的气相色谱-串联质谱检测方法, 并对市场上不同类型酒类食品邻苯二甲酸酯含量的分布情况进行分析。方法 用正己烷提取样品, 气相色谱-串联质谱定量分析。结果 线性范围为5~10000 μg/L , 相关系数大于0.999, 仪器检出限为0.1~25 μg/L, 样品的检出限为0.001~0.1 mg/kg 。3个浓度梯度(0.3、3.0、30.0 mg/kg)的平均回收率在83.7%~105.9%, 相对标准偏差(RSD, n = 6)在1.9%~5.7%。抽样结果显示配制酒中邻苯二甲酸酯检出率较其他类型酒类高。结论 此方法灵敏度高、准确、重现性好, 适用于酒类食品中邻苯二甲酸酯的检测。     

Short communication: Identification of subclinical cow mastitis pathogens in milk by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

Subclinical mastitis is a common and easily disseminated disease in dairy herds. Its routine diagnosis via bacterial culture and biochemical identification is a difficult and time-consuming process. In this work, we show that matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) allows bacterial identification with high confidence and speed (1 d for bacterial growth and analysis). With the use of MALDI-TOF MS, 33 bacterial culture isolates from milk of different dairy cows from several farms were analyzed, and the results were compared with those obtained by classical biochemical methods. This proof-of-concept case demonstrates the reliability of MALDI-TOF MS bacterial identification, and its increased selectivity as illustrated by the additional identification of coagulase-negative Staphylococcus species and mixed bacterial cultures. Matrix-assisted laser desorption-ionization mass spectrometry considerably accelerates the diagnosis of mastitis pathogens, especially in cases of subclinical mastitis. More immediate and efficient animal management strategies for mastitis and milk quality control in the dairy industry can therefore be applied.     

同位素稀释-气相色谱/高分辨质谱法测定食品中的指示性毒杀芬指示性毒杀芬

目的 建立食品样品中P26, P50, P62等三大指示性毒杀芬的检测分析方法,为进一步开展常规监测提供技术平台和基础数据。方法 食品样品使用索式提取系统(Soxtec)提取, 提取液依次由30%酸性硅胶柱和氧化铝柱净化, 利用同位素稀释-高分辨气相色谱/高分辨双聚焦磁式质谱联用(ID-HRGC/HRMS)技术对三种指示性毒杀芬单体P26, P50, P62进行定量定性分析。结果 本研究所建成的检测方法相对标准偏差(RSD)小于25%, 回收率可以达到40%~120%; P26, P50, P62的方法检测限分别为0.08、0.02、0.06 pg/g; 方法性能达到开展食品样品中毒杀芬检测技术的要求。结论 该方法可以对食品样品中毒杀芬进行检测, 检测效率高, 结果准确可靠。