高效液相色谱-串联质谱法同时测定食品中9种人工色素

目的建立一种同时测定食品中9种人工色素(赤藓红、诱惑红、柠檬黄、亮蓝、靛蓝、胭脂红、苋菜红、日落黄、新红)的高效液相色谱-串联质谱(high performance liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)检测方法。方法 3种食品样品分别经3种不同的固相萃取柱净化方法净化,采用甲醇(A)和10 mmol/L乙酸铵(B)为流动相,梯度洗脱分离,电喷雾离子化,正离子扫描,多反应监测对9种人工色素进行定性和定量。结果本方法在15 min内完成9种目标化合物的分离分析;采用PLS固相萃取小柱进行前处理,各色素在100μg/kg添加水平的回收率为98.1%~102.3%,结论该前处理方法回收率高,仪器方法快速、准确、灵敏,适合测定食品中9种人工色素。     

高效液相色谱-串联质谱法测定甘蔗中的3-硝基丙酸含量

目的建立高效液相色谱-串联质谱法(high liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)检测甘蔗中的3-硝基丙酸含量。方法样品经乙腈提取,经Sep-pak氨基柱固相萃取净化,再经Merck seQuant~(TM) Zic-Hilic(150 mm×2.1 mm,5μm)色谱柱分离,以10 mmol/L甲酸铵-0.1%甲酸和乙腈为流动相进行梯度洗脱,采用电喷雾负离子(electrospray ionization,ESI-)模式进行HPLC-MS/MS测定。结果 3-硝基丙酸在0.005~0.1 mg/L浓度范围内呈良好的线性关系,工作曲线的回归方程为Y=4.48X+46.72,相关系数为0.9994,该方法的检出限为0.0036 mg/kg,定量限为0.0119 mg/kg。在0.02、0.08和0.1 mg/kg加标水平下,3-硝基丙酸的平均回收率为80.0%~96.8%,相对标准偏差为1.90%~8.69%(n=6)。结论本方法快捷、灵敏度高、结果准确,可适用于甘蔗中的3-硝基丙酸的检测。     

超高效液相色谱-串联质谱法测定乳饼中的氯霉素

目的建立一种超高效液相色谱-串联质谱法(ultra high performance liquid chromatography tandem mass spectrometry, UPLC-MS/MS)检测乳饼中氯霉素的分析方法。方法样品经乙酸乙酯提取,分析了分别经C18(100 mm×2.1 mm, 1.7μm)及MCS固相萃取柱净化、富集的结果;以乙腈-0.05%氨水为流动相,经C18色谱柱分离,采用多反应检测负离子模式进行定性及定量分析。结果 MSC固相萃取柱具有较好的回收率,氯霉素的方法检出限为0.004μg/kg,方法定量限为0.01μg/kg,在0.10、0.50、1.00、10.00 ng 4个加标水平下回收率分别为76.4%、101%、62.4%、61.1%。结论本方法灵敏度高、重复性好,可满足乳饼样品中痕量氯霉素残留的测定。     

固相萃取-高效液相色谱-串联质谱法测定蜂蜜中高氯酸盐

目的建立一种固相萃取-高效液相色谱-串联质谱法测定蜂蜜中高氯酸盐的含量。方法样品用酸化甲醇水提取, WAX固相萃取柱净化,经Phenyl-hexyl色谱柱分离,以电喷雾离子源在负离子多反应监测模式下进行测定,内标法定量。结果高氯酸盐的检出限和定量限分别为0.33μg/kg和1μg/kg,高氯酸盐在1～10μg/kg的加标水平内的回收率为91.6%～108.3%,相对标准偏差为2.81%～3.47%。结论该方法准确、灵敏,适用于蜂蜜中高氯酸盐的测定。     

全自动固相萃取-高效液相色谱-串联质谱法测定 蜂蜜中3种农药残留

目的建立蜂蜜中多菌灵、甲基托布津和乙基托布津3种农药的全自动固相萃取-高效液相色谱-串联质谱检测方法。方法蜂蜜样品经磷酸盐缓冲液(pH=7.8)溶解,稀释,全自动固相萃取净化后,采用高效液相色谱-串联质谱测定,内标法定量。结果 3种农药在2~100μg/L范围内呈良好的线性关系(r~20.99),定量限为5μg/kg。在5.0、10.0、20.0μg/kg 3个加标水平下,3种农药的回收率为75.6%~97.1%,相对标准偏差小于13.2%。结论该方法简单、快速,准确度和精密度良好,可用于蜂蜜中多菌灵、甲基托布津和乙基托布津的同时测定。     

高效液相色谱-串联质谱法测定蜂蜡中痕量氯霉素残留

目的 建立正己烷预处理-固相萃取净化-高效液相色谱-串联质谱法检测蜂蜡中痕量氯霉素的分析方法.方法 试样采用正己烷预溶解,经水提取后进行亲水亲脂平衡(hydrophilic-lipophilic-balance,HLB)固相萃取小柱净化,用Accucore XL C18柱分离,多反应监测(multiple reacti...     

超高效液相色谱-串联质谱法测定鸭肝中的头孢曲松钠

目的建立超高效液相色谱-串联三重四极杆质谱(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)测定鸭肝中头孢曲松钠的分析方法。方法样品经乙腈水溶液(8:2,V:V)提取,以hydrophilic-lipophilic balance(HLB)固相萃取小柱净化,采用甲醇-0.1%甲酸水溶液为流动相,Agilent Eclipse Plus C_(18) RRHD为分离柱,进行梯度洗脱,串联质谱ESI正模式电离,多反应监测(multiple reaction monitoring,MRM)模式检测,以保留时间和子离子比定性,外标法定量。结果头孢曲松钠在2～40μg/L范围内线性关系良好,相关系数均大于0.999,方法检出限(S/N=3)为1.0μg/kg,加标水平为2～10μg/kg(n=6)时,平均回收率为84.5%～94.6%,相对标准偏差(RSD)6%。结论本方法准确、灵敏,可适用于鸭肝中头孢曲松钠抗生素的测定。     

全自动固相萃取-超高效液相色谱串联质谱法测定蜂蜜中的氯霉素

目的:建立全自动固相萃取超高效液相色谱-质谱联用测定蜂蜜中氯霉素的分析方法。方法:样品经乙酸乙酯提取,全自动固相萃取仪净化后,采用超高效液相色谱串联质谱法进行检测,内标法定量。结果:氯霉素在0.50~5.0 ng/mL范围内保持良好的线性,以3倍信噪比计算氯霉素的检出限为0.05μg/kg。结论:该方法自动化程度高,结果准确度和重现性好,检出限低,可满足蜂蜜中氯霉素残留的检测要求。     

高效液相色谱-串联质谱法测定肌肉组织中4种兽药残留

建立同时测定肌肉组织中新霉素、灰黄霉素、多黏菌素B、喹乙醇及其代谢物3-甲基喹啉-2-羧酸(3-methyl-quinoxaline-2-carboxylic acid,MQCA)的高效液相色谱-串联质谱(high performance liquid chromatography-tandem mass spectrometry,HPLC-MS/MS)分析方法。肌肉组织匀浆均质后使用乙腈-5%甲酸水溶液提取,HLB固相色谱柱净化,HPLC分离,电喷雾离子源正离子模式及多反应监测模式检测,外标法定量。结果表明:4种兽药在质量浓度1.0~200.0ég/L范围内均表现出良好的线性关系,R2均大于0.998 0;新霉素、灰黄霉素和多黏菌素B的方法检出限为5.0μg/kg,喹乙醇及MQCA为0.5μg/kg;阴性样品中4种兽药的加标回收率为82.1%~98.4%,日内相对标准偏差(relative standard deviation,RSD)(n=6)为2.2%~6.7%。该方法前处理过程简单、干扰较少,检测结果准确,适用于肌肉组织中4种兽药的定性与定量检测。     

液相色谱串联质谱法测定食品中红曲色素

采用液相色谱串联质谱法测定了食品中红曲红胺、红曲红素、红曲素、红曲黄素的含量,并选择离子检测进行阳性确证。液体试样用水超声提取,离心定容后,固体和半固体样品采用水溶解定容,提取液再经固相萃取柱净化,样液经洗脱定容后,供液相色谱-质谱/质谱仪测定和确证,外标法定量。该方法的最低检出限、线性范围和方法回收率分别为:1.0 mg/kg、1.0～100.0 mg/kg和89.3%～94.3%。     

液相色谱串联质谱法测定饲料中高氯酸盐含量

目的建立液相色谱串联质谱检测饲料中高氯酸盐含量的方法。方法饲料样品经乙腈-水(2:1,V:V)超声提取,高速离心后,上清液经石墨炭黑固相萃取柱净化,液相色谱串联质谱测定,内标法定量。结果高氯酸盐在0～100ng/mL浓度范围内呈良好线性关系(r2=0.9998)。本方法的定量限为15.0μg/kg。高氯酸盐在15～150μg/kg添加浓度范围内,回收率为95.1%～102.4%,相对标准偏差为1.13%～9.82%。结论本方法前处理简单,具有较高准确度、灵敏度、稳定性,可以满足饲料中高氯酸盐的含量检测。     

Development and validation of rapid multiresidue and multi-class analysis for antibiotics and anthelmintics in feed by ultra-high-performance liquid chromatography coupled to tandem mass spectrometry

A new multi-residue method for the analysis of veterinary drugs, namely amoxicillin, chlortetracycline, colistins A and B, doxycycline, fenbendazole, flubendazole, ivermectin, lincomycin, oxytetracycline, sulfadiazine, tiamulin, tilmicosin and trimethoprim, was developed and validated for feed. After acidic extraction, the samples were centrifuged, purified by SPE and analysed by ultra-high-performance liquid chromatography coupled to tandem mass spectrometry. Quantitative validation was done in accordance with the guidelines laid down in European Commission Decision 2002/657/CE. Matrix-matched calibration with internal standards was used to reduce matrix effects. The target level was set at the authorised carryover level (1%) and validation levels were set at 0.5%, 1% and 1.5%. Method performances were evaluated by the following parameters: linearity (0.986 < R² < 0.999), precision (repeatability < 12.4% and reproducibility < 14.0%), accuracy (89% < recovery < 107%), sensitivity, decision limit (CCα), detection capability (CCβ), selectivity and expanded measurement uncertainty (k = 2).This method has been used successfully for three years for routine monitoring of antibiotic residues in feeds during which period 20% of samples were found to exceed the 1% authorised carryover limit and were deemed non-compliant.     

Determination of malachite green residues in rainbow trout muscle with liquid chromatography and liquid chromatography coupled with tandem mass spectrometry

A method for the determination of malachite green and its major metabolite leucomalachite green in rainbow trout muscle is reported with limits of detection of 0.8 and 0.6 μg kg^-1, respectively. Residues were extracted with an acetonitrile-acetate buffer mixture and partitioned into methylene chloride. Clean-up of the extracts was performed on alumina and propylsulfonic acid solid-phase extraction columns using the automated solid-phase extraction system. The chromatographic separation of malachite green and leucomalachite green was achieved on a Chromspher 5B column using an acetonitrile-acetate buffer mobile phase. Leucomalachite green was converted to malachite green by post-column oxidation before spectrophotometric detection at 600 nm. The mean recoveries of malachite green and leucomalachite green from control rainbow trout muscle spiked at 2-50 μg kg^-1 were 65% (range 63.4-65.9%, relative standard deviation 3.9-16.1%) and 74% (range 58.3-82.6%, relative standard deviation 3.3-11.4%), respectively. Qualitative confirmation of the determined residues was performed with liquid chromatography coupled with tandem mass spectrometry detection with limits of detection of 2.5 and 1 μg kg^-1 for malachite green and leucomalachite green, respectively.     

Multi-targeted screening of botanicals in food supplements by liquid chromatography with tandem mass spectrometry

Safety, quality and composition assessments of food supplements based on botanical ingredients are of major concern, as they have usually not been through a rigorous testing process as required for the approval of therapeutic phytopreparations. Therefore, an efficient multi-targeted method was developed to screen selected botanicals of interest in herbal food supplements. Liquid chromatography coupled with a hybrid triple quadrupole linear ion trap was used for this purpose. Botanicals were characterised by means of appropriate biomarkers, which were unambiguously identified by mass spectrometry using an information dependent acquisition experiment which combined a multiple reaction monitoring survey with dependent enhanced product ion scans. During this procedure, product ion scans of targeted analytes were generated at three collision energies and compared with an in-house library of MS/MS spectra acquired from reference standards of all biomarkers. This generic method enables detection, identification and quantification of 98 biomarkers intended to characterise 79 selected plants.     

液相色谱-串联质谱技术在食品中抗菌药物残留分析中的应用

对液相色谱-串联质谱技术在食品中常用抗菌药物残留分析中的应用进展进行了综述,重点论述了近年来该技术在几种常用抗菌药物如β-内酰胺类、四环素类、大环内脂类、氨基糖苷类、酰胺醇类、磺胺类、喹诺酮类和硝基呋喃类的残留分析中的应用。同时,介绍了食品中多种类别抗菌药物残留同时检测的液相色谱-串联质谱方法,提出四极杆串联飞行时间质谱在多类别抗菌药物残留同时分析中具有广阔的应用前景,并对液相色谱-串联质谱技术在食品中抗菌药物残留分析领域未来的发展趋势进行了展望。      

液相色谱-串联质谱法快速测定食品中的可乐定

目的 采用超高压液相色谱-电喷雾串连四极杆质谱分析食品基质中的可乐定, 为可乐定中毒事件的 样本分析提供依据。方法 食物样本粉碎后经甲醇水溶液超声提取, 低温离心后, 上清液用 Waters ACQUITY UPLCTM BEH C18 色谱柱分离, 以 0.1%甲酸和甲醇溶液为流动相梯度洗脱, 最后用串联四极杆质谱在正离子 MRM 模式下进行测定。结果 以淀粉和炸鸡为加标基质, 三个加标水平下可乐定的平均回收率为 91.5%~127.8%, 相对标准偏差小于 16%, 定量限为 0.02 mg/kg。结论 该方法操作快速简单、重现性好, 成功 用于 2010 年 4 月怀柔水岸山吧可乐定中毒事件的食品检测。     

Simultaneous determination of pesticide residues in crops by liquid chromatography with tandem mass spectrometry

A simultaneous method using liquid chromatography coupled with electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) was developed for the determination of pesticide residues in crops. Mass spectral acquisition was performed in the positive mode by applying multiple reaction monitoring. In LC separation, an Atlantis dC18 Column was used with acetic acid-ammonium acetate-acetonitrile as the mobile phase. Pesticide residues in crops were extracted with acetone, and cleaned up by liquid-liquid separation with saturated salt solution and hexane, followed by an ENVI-Carb cartridge. The quantification limits of compounds in crops were below 5 ng/g. Eighty compounds were obtained with recoveries ranging from 60 to 130% at the level of 50 ng/g with RSD (%) of less than 15%. Fifty crop samples were analyzed by the developed method. Seven pesticide residues were detected in nine crops.     

Simultaneous determination of aminoglycoside antibiotics in milk by liquid chromatography with tandem mass spectrometry

A multiresidue method was developed for determination of nine aminoglycoside antibiotics (streptomycin, dihydrostreptomycin, spectinomycin, neomycin, kanamycin, gentamicin, destomycin A, apramycin, and tobramycin) in milk by LC/MS/MS. The drugs were extracted with 0.01 mol/L potassium dihydrogen phosphate containing 2% trichloroacetic acid, and the extracted solution was cleaned on cation-exchange cartridge columns (Oasis WCX and Oasis MCX). LC separation was performed on a TSK-gel VMpak25 column (50 mmx2.0 mm i.d.) using gradient elution with 0.1% formic acid and acetonitrile containing 0.1% formic acid as the mobile phase. Recoveries of the drugs spiked at 0.01 or 0.1 microg/g in milk ranged from 66.1 to 110.8%, with a coefficient of variation of less than 17.1%. Limits of quantification of the drugs in milk were 0.001 approximately 0.01 microg/g. This method was used for analysis of milk from a lactating cow treated for clinical mastitis with two intramammary infusions of kanamycin (KM). Milk samples were analyzed during the withdrawal times at 12-hour intervals. KM concentrations were lower than the Japanese provisional MRLs (0.4 microg/g) at 60 hours after infusion, and subsequently fell to 0.01 microg/g.     

Determination of selected mycotoxins in mould cheeses with liquid chromatography coupled to tandem with mass spectrometry

A simple and feasible method is described for analysing nine mycotoxins in cheese matrix. The method involves liquid extraction followed by high performance liquid chromatographic separation and mass spectrometric detection of the analytes, and allows the determination of aflatoxins B1, B2, G1, G2 and M1, ochratoxin A, mycophenolic acid, penicillic acid and roquefortine C simultaneously. Average recoveries of the mycotoxins from spiked samples at concentration levels of 5-200 µg kg^-1 ranged from 96-143%. Within-day relative standard deviations at these concentration levels varied from 2.3-12.1%. The limit of quantification for aflatoxin M1 was 0.6 µg kg^-1 and for the other compounds 5 µg kg^-1. The method developed was applied for analysing these mycotoxins in blue and white mould cheeses purchased from Finnish supermarkets. Roquefortine C was detected in all of the blue mould cheese samples in concentrations of 0.8-12 mg kg^-1. One blue cheese contained also 0.3 mg kg^-1 mycophenolic acid. The other investigated mycotoxins were absent in the samples.     

高效液相色谱和液相色谱串联质谱技术在检测苹果制品中展青霉素的研究进展

展青霉素是一种有害的真菌毒素代谢物,主要对人类的中枢神经系统造成影响,且对消化系统和肾脏也造成不同程度的毒害影响。展青霉素在食品中的污染是世界各地普遍存在的问题,尤其在苹果汁、苹果脯、苹果蜜饯、苹果酱等食物中。考虑到它的毒性和广泛性,很多管理机构对食品基体中展青霉素的含量做出了严格的限制。因此控制展青霉素污染对于保障食品安全具有重要意义。目前液相色谱技术是苹果制品中展青霉素的主要检测方法。本文系统地总结了检测苹果制品中展青霉素的前处理方法,并综述了高效液相色谱和液相色谱联用质谱技术在苹果制品中展青霉素检测的最新研究进展。