凝胶渗透色谱-超高效液相色谱-串联质谱法测定奶及奶粉中黄曲霉毒素M_1

建立了用凝胶渗透色谱-超高效液相色谱/串联三重四级杆质谱测定牛奶中黄曲霉毒素M_1的方法。方法以乙腈超声提取,凝胶渗透色谱净化后,以乙腈-0.1%甲酸(3:7,V/V)为流动相,UPLC BEH C18分离,ESI+模式质谱检测,外标法定量。黄曲霉毒素M_1在0.1~4.0μg/L范围内线性关系良好,相关系数r为0.9955,检出限为0.01μg/kg,定量限为0.05μg/kg。牛奶样品在0.1,0.2,0.5μg/kg 3个加标浓度下,黄曲霉毒素M_1的回收率为72.4%~92.2%,相对标准偏差为4.0%~7.8%。     

固相萃取-高效液相色谱/串联质谱检测谷物中黄曲霉毒素B1、B2、G1、G2和M1

建立了高效液相色谱/串联质谱(LC-MS/MS)同时检测谷物中的黄曲霉毒素B1、B2、G1、G2和M1的方法.并优化了液相色谱条件和质谱的相关参数.谷物样品经研磨成粉末后,直接经甲醇-水( V∶V=10∶90)提取,Oasis HLB固相萃取净化,乙腈-水(0.2％甲酸)梯度洗脱,选择电喷雾离子源(ESI),正离子扫描...     

高效液相色谱-串联质谱法测定动物源食品中粘杆菌素、多粘菌素B的残留量

建立了动物源食品中粘杆菌素和多粘菌素B残留的高效液相色谱-串联质谱(HPLC-MS/MS)测定方法。样品用V(10%三氯乙酸水溶液):V(乙腈)=30:70提取,Oasis WCX SPE柱净化,LC-MS/MS电喷雾正离子多反应监测模式(ESI+-MRM)检测。分析物在0～250μg/kg的浓度范围内呈良好线性,线性相关系数>0.995。方法的定量限为10μg/kg。方法在三个添加水平的平均回收率在71.6%～78.9%之间,相对标准偏差在6.2%～12%之间。方法适用于动物源食品中粘杆菌素和多粘菌素B的定量及确证检测。     

高效液相色谱-串联质谱法测定山茶油中黄曲霉毒素B1

建立了山茶油中黄曲霉毒素B1含量的高效液相色谱-串联质谱分析方法。通过对前处理方法的优化,选择了甲醇和水作为山茶油中黄曲霉毒素B1的提取溶剂,经免疫亲和柱富集浓缩后,采用高效液相色谱-串联质谱进行分析,经C18色谱柱分离,在电喷雾离子化正离子模式(ESI+)及多反应监测模式(MRM)下进行测定,基质匹配标准溶液外标法定量。在优化条件下,该方法线性范围为0.4～6.4μg/L,相关系数r2>0.998,最低检出限为0.026μg/kg,在添加水平为0.008,0.016和0.032μg时,方法回收率在85.9%～93.8%之间;相对标准偏差为1.8%～5.0%。方法可满足山茶油中黄曲霉毒素B1的检测要求。     

液相色谱-串联质谱法测定饲料中14种霉菌毒素及其类似物

采用高效液相色谱-电喷雾串联质谱仪(LC-ESI-MS-MS),在多反应监测(MRM)模式下建立了饲料中玉米赤霉烯酮、黄曲霉毒素和单端孢霉烯族A类毒素等14种毒素及其类似物的快速确认测定方法。试样中的黄曲霉毒素、玉米赤霉烯酮和单端孢霉烯族A类毒素经乙腈-水(84:16,V/V)提取,正己烷脱脂及霉菌毒素多功能净化柱净化,氮气吹干,用1mL乙腈/水(1:1,V/V)定容后,进行液相色谱-串联质谱法测定,采用色谱保留时间和质谱碎片离子丰度比定性,外标法定量。采用正离子扫描和负离子扫描的方式进行仪器方法学研究,确定丰度比最高的2对离子作为监测离子,进行MRM模式定性定量分析。本方法的检出限(LOD)为0.1～0.8μg/kg;线性范围为2.0～200.0μg/L,相关系数r均大于0.999。在5.0～100μg/kg的添加水平上,上述14种霉菌毒素及其类似物的平均回收率为59.0%～107%;相对标准偏差为2.1%～12.6%。     

高效液相色谱-质谱法同时测定曲霉菌代谢物中的黄曲霉毒素及其同系物

建立了同时检测曲霉菌代谢物中黄曲霉毒素和同系物的超高效液相色谱-线性离子阱质谱测定方法。寄生曲霉(菌株3.124)经PDA液体培养基培养,Qu ECh ERS方法提取净化后经线性离子阱(QTrap)质量分析器分析(正离子模式,多反应检测),检出3.124代谢物中黄曲霉毒素B1(AFB1)、黄曲霉毒素B2(AFB2)、黄曲霉毒素G1(AFG1)、黄曲霉毒素G2(AFG2)、O-甲基杂色曲霉素(MST)、杂色曲霉素(ST)6种真菌毒素。结果表明,6种代谢物在0.1~40μg/L范围内线型关系良好,相关系数均大于0.993,检出限在0.03~0.2μg/L之间,定量限在0.1~0.5μg/L之间。本方法 6种代谢物日内回收率为81.3%~92.1%,相对偏差(RSD)为4.3%~8.6%;日间回收率为81.8%~91.5%,RSD为4.0%~8.7%。方法可满足霉菌代谢物中黄曲霉毒素及其类似物的检测与确证的需要。     

多功能柱净化-柱后光化学衍生-高效液相色谱法同时检测玉米和花生中9种真菌毒素

建立了同时检测玉米和花生中黄曲霉毒素B1、B2、G1、G2、M1、M2、玉米赤霉烯酮、呕吐毒素和展青霉素的多功能柱净化-柱后光化学衍生-高效液相色谱检测方法。样品经乙腈-水(体积比为86∶14)提取,多功能净化柱净化,采用C18柱分离,以甲醇、乙腈和水为流动相进行梯度洗脱,在线光化学衍生,以荧光和二极管阵列测器同时检测。黄曲霉毒素B1、B2、G1、G2、M1、M2、玉米赤霉烯酮、呕吐毒素和展青霉素的检出限分别为0.02μg/kg、0.01μg/kg、0.03μg/kg、0.05μg/kg、0.08μg/kg、0.04μg/kg、0.09μg/kg、0.20mg/kg和0.04 mg/kg,在相应浓度范围内线性相关系数均大于0.999,平均加标回收率为80.0%~101.5%,相对标准偏差在1.3%~5.6%之间。该方法简便快速、灵敏度高、重现性好,可满足玉米、花生中9种黄曲霉毒素的检测。     

固相萃取-液相色谱-串联质谱法检测小鼠肌肉组织中矮壮素

建立了快速检测小鼠肌肉组织中矮壮素的固相萃取-液相色谱-串联质谱(SPE-LC-MS/MS)方法。小鼠肌肉样品经乙腈提取,弱阳离子交换(WCX)固相萃取柱净化,3 mL甲酸-甲醇(1∶99,V/V)重力洗脱。采用亲水作用色谱柱(HILIC),含10 mmol/L乙酸铵、0.1%甲酸水溶液-乙腈(40∶60,V/V)为流动相,以电喷雾正离子(ESI+)、多反应监测模式(MRM)进行矮壮素的定性分析,采用基质标准曲线外标法进行定量分析。结果表明:矮壮素的线性范围为5.0～500.0μg/L,线性相关系数为0.9991。在10.0,100.0和200.0μg/kg添加浓度下的回收率为73.2%～82.3%;相对标准偏差小于9.3%;方法定量限为10.0μg/kg,能够满足小鼠肌肉组织中痕量矮壮素检测的要求。     

分散固相萃取/液相色谱-串联质谱法测定花生及土壤中的噻虫啉

建立了一种检测土壤、花生植株、花生果实及花生壳中噻虫啉的分散固相萃取(DSPE)/液相色谱-串联质谱(HPLC-MS/MS)快速检测方法。对提取溶剂、不同分散固相吸附剂及其用量进行了考察和优化。样品经0.1%乙酸乙腈溶液提取后,以50 mg N-丙基乙二胺吸附剂(PSA)、50 mg十八烷基键合硅胶(C18)和10 mg石墨化碳黑(GCB)固相萃取填料净化,采用水-甲醇作为流动相进行梯度洗脱,电喷雾正离子(ESI+)模式电离,质谱采用多离子监测模式(MRM)进行定性分析,基质标准曲线外标法进行定量分析。在0.1~50μg/kg范围内,不同基质中噻虫啉的线性相关系数均大于0.996。在土壤、花生植株、花生果实及花生壳中添加3个不同浓度水平的噻虫啉标准品,得到噻虫啉的回收率为70.6%~119%,相对标准偏差不大于16.6%,方法的定量下限为1.0~5.0μg/kg,能够满足现有国际限量的要求。     

全自动固相萃取/高效液相色谱-串联质谱法（HPLC-MS/MS）测定深海鱼中雪卡毒素残留量

建立了深海鱼鱼肉中雪卡毒素残留的高效液相色谱-串联质谱检测方法。虎鳗等样品经甲醇-正己烷(4∶1)提取,HLB柱净化后,采用高效液相色谱-串联质谱分析,外标法定量。质谱分析采用电喷雾电离,正离子扫描,多反应监测模式。定性离子对为m/z 1 128.9/1 057.6、1 128.9/1 039.9、1 128.9/1 075.8。实验结果表明,HLB柱净化后基质效应明显降低,样品中添加0.01～0.1μg/kg的雪卡毒素,其回收率为70%～84%,相对标准偏差(n=6)小于7%;雪卡毒素的检出限为0.01μg/kg,定量下限为0.02μg/kg。该方法样品前处理简单、分析时间短、灵敏、可靠,适用于深海鱼中雪卡毒素含量的检测。     

液相色谱-串联质谱法同时检测饲料中7种精神类药物

建立了液相色谱-串联质谱同时检测饲料样品中7种精神类药物(硝西泮、奥沙西泮、氯丙嗪、异丙嗪、地西泮、奋乃静、硫利达嗪)的方法.通过对提取溶剂、净化等预处理条件及LC-MS/MS 分析条件的优化,可以同时检测饲料中7种违禁精神类药物.饲料样品经乙腈/水(9:1, V/V)提取后,过MCX固相萃取柱净化,氮吹至干,用1 mL乙腈/水(2:8, V/V)溶解后测定,采用SRM模式进行定性与定量分析.7种精神类药物在饲料中的回收率为53.9%～110.2%; 相对标准偏差为3.4%～18.4%;硝西泮、奥沙西泮、氯丙嗪、异丙嗪的检出限为1.0 ng/g;对地西泮、奋乃静、硫利达嗪的检出限为5.0 ng/g.结果表明,本方法可用于饲料中7种精神类药物的测定.     

固相萃取-超高效液相色谱-电喷雾串联质谱法测定调味品中的罗丹明B

利用超高效液相色谱-电喷雾串联质谱(UPLC-MS/MS)方法测定了调味品中罗丹明B。样品经乙腈-乙酸水溶液提取后,经固相萃取(SPE)柱净化,采用BEH C18柱分离,以乙腈和0.2%的甲酸水溶液为流动相进行梯度洗脱,采用正离子、多反应监测(MRM)模式进行定性定量测定。罗丹明B在0.5～500μg/L质量浓度范围内线性关系良好,相关系数r为0.999,检出限、定量限分别为0.03,0.10μg/kg;平均回收率为86.6%～95.7%,标准偏差小于10%。方法适用于调味品中罗丹明B的测定。     

液相色谱-串联质谱法测定宠物食品中赭曲霉毒素A和B

建立了同时测定宠物食品中赭曲霉毒素A和B的液相色谱-串联质谱分析方法。样品经乙腈/水(1∶1,V/V)提取,HLB固相萃取柱净化。采用Agilent ZOBRAX C_(18)柱(150×2.1mm,5μm)分离,以0.1%甲酸水溶液-乙腈作为流动相,梯度洗脱。目标化合物在多反应监测模式(MRM)下进行检测,外标法定量。在优化的条件下,赭曲霉毒素A和B在0.1~10.0ng·mL~(-1)范围内呈良好的线性关系,相关系数均不低于0.9993,方法定量限分别为0.1μg·kg~(-1)和0.05μg·kg~(-1)。方法平均回收率为78.3%~107.5%,相对标准偏差不大于9.5%。该方法前处理简单、选择性好、灵敏度高,可用于宠物食品中赭曲霉毒素A和B的测定。     

Determination of abamectin in soil samples using high-performance liquid chromatography with tandem mass spectrometry

Abamectin, which is comprised of a mixture of avermectins B1a and B1b, is a natural pesticide used as an anti-parasitic agent in livestock, ornamental, and agricultural crops, which can potentially be transported to aquatic systems. These compounds are highly toxic to both aquatic vertebrates and invertebrates at low concentrations in water. This investigation developed high-performance liquid chromatography/tandem mass spectrometry (HPLC/MS/MS) techniques to support automated extraction by an accelerated solvent extraction (ASE) system and chromatographic techniques to measure residues of avermectins in complex soil samples. HPLC along with atmospheric pressure chemical ionization (APCI) MS/MS was used for separation and determination of avermectin isomers in soil samples. Average method recovery for abamectin by UV was 91%, while detection by MS/MS resulted in a 68% recovery for abamectin. Individual method recoveries by MS/MS were 53.6% for avermectin B1a and 36.8% for avermectin B1b. The use of tandem technology eliminated matrix interferences and resulted in an approximately eight-fold increase in sensitivity.     

液相色谱-串联质谱法同时测定动物血浆中21种霉菌毒素或其代谢物残留

建立了同时检测动物血浆中黄曲霉毒素B1等21种霉菌毒素或其代谢物残留的液相色谱-串联质谱方法.动物血浆样品中加入0.1％甲酸-乙腈溶液、NaCl和无水MgSO4进行萃取,无水MgSO4和C18,PSA,A-AL对提取液进行脱水净化,经浓缩、复溶和离心后,再进行测定.采用反相C18色谱柱分离,以0.1％甲酸-0.5 mmol/L乙酸铵溶液和0.1％甲酸-甲醇溶液作为流动相进行梯度洗脱,采用电喷雾离子源(ESI)多反应监测离子模式(MRM)进行检测,基质标准曲线外标法进行定量分析,线性范围在0.05 ～ 100 ng/mL之间,方法的定量限为0.05 ～0.5 ng/mL.在高、中、低3个添加浓度水平下,21种霉菌毒素的平均回收率为62.0％ ～ 116.4％,相对标准偏差小于19％.     

Determination of polychlorodibenzo-p-dioxins and polychlorodibenzofurans by gas chromatography/tandem mass spectrometry and gas chromatography/triple mass spectrometry in a quadrupole ion trap

The determination of tetra- to octachlorodibenzo-p-dioxins and tetra- to octachlorodibenzofurans (PCCD/Fs) by high-resolution gas chromatography/tandem mass spectrometry (HRGC/MS/MS) and high-resolution gas chromatography/triple mass spectrometry (HRGC/MS(3)) in a quadrupole ion trap, equipped with an external ion source, is presented. MS/MS involves a typical four-step process, namely ionization, parent ion isolation, collision-induced dissociation (CID) and mass analysis of the daughter ions. For the MS(3) experiment, the MS/MS scan function is used with the addition of selected daughter ion isolation, their CID and the mass analysis of second-generation product ions called 'grand-daughter ions.' For both methods, the energies necessary for the CID of the 17 PCDD/Fs were determined and optimized using multiple scan functions with different CID amplitudes. The CID efficiency, defined as the signal ratio of fragment ions detected from the major dissociation channels to molecular ions isolated, was 1.15-2.40 V for parent ion dissociation (MS/MS) and 1.05-1.50 V for daughter ion dissociation (MS(3)) and for all the chloro congeners. The same sensitivity (1 pg microl(-1)) can be reached with both the MS/MS and MS(3) methods and linear responses were obtained between 1 and 100 pg microl(-1) injected.     

高效液相色谱法测定含脂羊毛中灭蝇胺和环虫腈

建立了高效液相色谱法(HPLC)测定含脂羊毛中的灭蝇胺和环虫腈的方法及HPLC-MS/MS确证方法。样品用80mL1%三氯乙酸溶液超声提取,MCX柱净化,Hypersil NH2色谱柱分离,水-乙腈为流动相梯度洗脱,214nm检测,HPLC-MS/MS确证。在正离子电喷雾电离(ESI+)模式下,环虫腈[M+H]+及2个主要的特征离子分别为m/z191.0,150.0和163.0;灭蝇胺[M+H]+及2个主要的特征离子分别为m/z167.0,85.0和125.0。在0.05～5.0mg/L范围内,灭蝇胺和环虫腈均有良好的线性关系,相关系数均为0.9999。本方法的检出限灭蝇胺为0.02mg/kg,环虫腈为0.01mg/kg。方法的平均加标回收率:灭蝇胺为95.0%～99.9%,环虫腈为83.6%～92.2%。     

高效液相色谱-串联质谱法测定稻米和稻壳中井冈霉素A的残留

本文建立了稻米和稻壳中井冈霉素A的高效液相色谱-串联质谱(HPLC-MS/MS)分析方法。样品用甲醇-水(9+1)涡旋提取,过滤膜后进行HPLC-MS/MS分析。用多反应监测技术确定井冈霉素A的两对离子对m/z498.2/178.1、m/z498.2/336.1为定性离子对,m/z498.2/178.1为定量离子对。方法的线性范围为0.005～0.2mg/L,其中稻壳的线性相关系数为0.9993,稻米的线性相关系数为0.9988。稻米、稻壳的0.05、0.1、0.5 mg/kg三个浓度的添加回收率为71.6%～88.8%,相对标准偏差(RSD)为1.89%～8.16%。方法的定量限(LOQ)为5μg/kg。     

Determination of the glycation sites of Bacillus anthracis neoglycoconjugate vaccine by MALDI-TOF/TOF-CID-MS/MS and LC-ESI-QqTOF-tandem mass spectrometry

We present herein an efficient mass spectrometric method for the localization of the glycation sites of a model neoglycoconjugate vaccine formed by a construct of the tetrasaccharide side chain of the Bacillus anthracis exosporium and the protein carrier bovine serum albumin. The glycoconjugate was digested with both trypsin and GluC V8 endoproteinases, and the digests were then analyzed by MALDI-TOF/TOF-CID-MS/MS and nano-LC-ESI-QqTOF-CID-MS/MS. The sequences of the unknown peptides analyzed by MALDI-TOF/TOF-CID-MS/MS, following digestion with the GluC V8 endoproteinase, allowed us to recognize three glycopeptides whose glycation occupancies were, respectively, on Lys 235, Lys 420, and Lys 498. Similarly, the same analysis was performed on the tryptic digests, which permitted us to recognize two glycation sites on Lys 100 and Lys 374. In addition, we have also used LC-ESI-QqTOF-CID-MS/MS analysis for the identification of the tryptic digests. However, this analysis identified a higher number of glycopeptides than would be expected from a glycoconjugate composed of a carbohydrate-protein ratio of 5.4:1, which would have resulted in glycation occupancies of 18 specific sites. This discrepancy was due to the large number of glycoforms formed during the synthetic carbohydrate-spacer-carrier protein conjugation. Likewise, the LC-ESI-QqTOF-MS/MS analysis of the GluC V8 digest also identified 17 different glycation sites on the synthetic glycoconjugate.