Determination of Tetracyclines and Their Epimers in Agricultural Soil Fertilized with Swine Manure by Ultra-High-Performance Liquid Chromatography Tandem Mass Spectrometry

A rapid, sensitive and specific ultra-high-performance liquid chromatography tandem mass spectrometry （UPLC-MS） method was developed for the analysis of tetracycline antibiotics, including tetracycline （TC）, oxytetracycline （OTC）, chlortetracycline （CTC） and their 4-epimers （4-epiTCs） in agricultural soil fertilized with swine manure. Soil samples were extracted and cleaned-up with 10 mL EDTA-McIlvaine buffer solution （pH 4.0）, then cleaned-up and pre-concentrated using the Oasis MAX cartridge and then eluted with 1 mL solution by mixing formic acid, methanol and water at a ratio of 2：15：83 （v/v/v）. The purified samples were separated by an ACQUITY UPLC BEH C18 column using acetonitrile and water containing 0.1% formic acid mobile phase and detected by a single quadrupole MS. The limits of detection for the soil extraction method （LODsoil） ranged from 0.6-2.5 lag kg-~ with recoveries from 23.3-159.2%. Finally, the method was applied to an agricultural field in an area with intensive pig-fattening farming. Tetracyclines were detected in soil from 2.8 to 42.4 μg kg-1 soil. These results demonstrate that soil from swine farms can become severely contaminated with tetracycline antibiotics and their metabolites.

Determination of Steroid Hormone Residues in Fish Tissues Using Gel Permeation Chromatography and Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

A highly sensitive method was developed for the simultaneous determination of 8 steroid hormones in high-fat fish tissues using ultra high performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS).The 8 steroid hormones were extracted from the tissues with diethyl ether.Differing from other common purification methods,the extract solutions were cleaned by gel permeation chromatography(GPC) using ethyl acetate-cyclohexane solution(1:1,v/v) as the mobile phase.The separation of target compounds was carried out by a BEH C18 column and a gradient elution consisting of acetonitrile and 0.2% aqueous formic acid(v/v).The compounds were detected under the multiple reaction monitoring(MRM) mode and quantified with external standard method.This method was validated with respect to linearity,specificity,accuracy and precision.A linearity with correlation coefficient larger than 0.995 was achieved in the range of 0.5 to 50 ng m L^(-1).The average recoveries at the spiked levels of 1.0,5.0,and 10.0 μg kg^(–1) varied between 81.7% and 90.8%,with the relative standard deviations(n=5) ranged from 3.50% to 10.0%.The limit of quantification(LOQ) for 8 steroid hormones ranged from 0.2 to 1.5 μg kg^(-1).It was concluded that this method can be successfully applied for the determination of 8 steroid hormones in complicated matrices including high-fat fish tissues.

Simultaneous Determination of Bisphenols and Alkylphenols in Water by Solid Phase Extraction and Ultra Performance Liquid Chromatography-tandem Mass Spectrometry

To establish an analytical method for determination of four bisphenols （BPA, BPB, BPF, and BPS） and two alkylphenols （4-n-OP, 4-n-NP） in water by ultra performance liquid chromatography- tandem mass spectrometry （UPLC/MS/MS）. The water samples were extracted and condensed with solid-phase extraction （SPE） using C18 cartridges and eluted by acetonitrile. Separation was carried out with Acquity BEH C8 column and detection were performed by UPLC/MS/MS. Quantification was calculated by using the internal standard BPA-d16 and 4-n-NP-d8. The linear correlation coefficients of these compounds in the range of 1.0-100.0μg/L were all over 0.999. The minimum detectable concentrations were 0.75-1.0 ng/L, and the recoveries ranged from 87.0% to 106.9%.

Uncertainty Evaluation of Determination of Microcystin MC-LR in Environmental Samples by Solid Phase Extraction-Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

To assess uncertainty of determination of MC-LR in environmental samples by solid phase extraction- ultra performance liquid chromatography- tandem mass spectrometry,the sources of the uncertainty were evaluated firstly,and the expanded uncertainty was calculated finally.The results show that when MC-LR concentration in the water samples was 0.50 μg/L,the expanded uncertainty was 0.00628 μg/L(k=2).

A Rapid Separation and Highly Determination of Paraben Species by Ultra-Performance Liquid Chromatography —Electrochemical Detection

In this study, a new technique was developed using rapid ultra-performance liquid chromatography (UPLC)-based separation coupled with electrochemical detection by a boron-doped diamond (BDD) electrode for the detection and quantification of three commonly used parabens (methylparaben (MP), ethylparaben (EP) and propylparaben (PP)). We aimed to reduce the analysis time by using UPLC coupled with a short reverse phase C 18 monolithic column (25 mm×4.6 mm). Operating the monolithic column at low back-pressure resulted in high flow rates. A mobile phaseconsisting of a 25:75 (v/v) ratio of acetonitrile:0.05 Mphosphate buffer (pH 5) at a flow rate of 2.5 mL·min?1 was used to perform the separation. The amperometric detection with the BDD electrode was found to be optimal and reliably reproducible at a detection potential of 1.5 V vs. Ag/AgCl. Under these conditions, the separation of the three targetanalytes (MP, EP and PP) was achieved in 2 min and was linear within a sample concentration range of 0.1 to 50.0 mg·L?1 (r2 values of 0.9970, 0.9994 and 0.9994 for MP, EP and PP, respectively). This method was successfully applied to determine the concentrations of each parabeninsix real samples with therecoveries ranging from of 80.3% - 98.9% for all three parabensfrom samples spiked at 12, 22 and 32 mg·L?1. Therefore, the proposed method can be used as an alternative rapid and selective method for the determination of paraben levels in real samples.

Chemical Components of Achyranthes bidentata Leaves by Ultra High Performance Liquid Chromatography-Mass Spectrometry

[Objectives] To study the chemical components and relative content of Achyranthes bidentata leaves and provide a scientific basis for further development and utilization of A. bidentata leaves.[Methods] The chemical components of A. bidentata leaves were rapidly analyzed using the ultra high performance liquid chromatography-time of flight-high resolution mass spectrometry (UHPLC-TOF-MS).[Results] Thirty eight chemical compounds were identified in samples of A. bidentata leaves collected from Wen County of Henan Province, in which seven chemical compounds had the relative content higher than 5%, linoleic acid reached 25.7% and inokosterone A reached 13.8%.[Conclusions] A. bidentata leaves contain many kinds of chemical compounds. This study is expected to provide a certain basis for further extraction of linoleic acid and inokosterone A.

Simultaneous Determination of Ultraviolet Absorbers and Antibacterial Agents in Textiles by Ultra-High Performance Liquid Chromatography/Orbitrap High Resolution Mass Spectrometry

This paper reported a new analytical method for the simultaneous determination of seven benzotriazole ultraviolet absorbers and seven antibacterial agents in textiles. After ultrasonic extraction for the textile samples in methanol, the solutions were analyzed by ultra-high performance liquid chromotagraphy/orbitrap high resolution mass spectrometry (UPLC/Orbitrap HRMS). It showed that a good chromatographic separation for these target compounds was achieved by a Hypersil GOLD column (100 mm × 2.1 mm × 1.9 μm) with a gradient elution of methanol and 0.1% aqueous formic acid solution (containing 0.5 mmol/L ammonium acetate). Triclosan and 4-chloro-3,5-dimethyl phenol (PCMX) were detected by the orbitrap HRMS in an electrospray ionization (ESI) negative mode while the other twelve target compounds were detected by orbitrap HRMS in ESI positive mode. Full scan experiment was performed over the range from m/z 100 to m/z 500. These target compounds were routinely detected with mass accuracy below 2 × 10-6 (2 ppm) at the optimized conditions. The results showed that the limits of detection (LODs) were in the range from 0.1 to 0.3 μg/kg. The blank samples were spiked at three levels and their average recoveries varied from 80.5% to 96.3% while the relative standard deviation (RSD) changed from 3.2% to 9.9%. The present method was also applied for the determination of those ultraviolet absorbers and antibacterial agents in the commercial textiles.

Development of a Fast and Facile Analytical Approach to Quantify Radiometabolites in Human Plasma Samples Using Ultra High Performance Liquid Chromatography

Introduction: Conventional metabolite analyses often require manual sample preparation, generating variability of measurements. This study describes a new method to quantify radiometabolites in blood, combining ultra high performance liquid chromatography (UHPLC) and turbulent flow chromatography, an alternative fully automated process allowing analyte’s extraction. Methods: A new radiotracer for dopamine transporter imaging, namely LBT-999, was used to demonstrate the method’s robustness. Matrix effect, Turboflow column loading, linearity, specificity and precision were evaluated with in vitro samples of LBT-999 in human plasma. Radiodetector sensitivity and preliminary evaluation were respectively determined by analysis of calibrated samples of [18F]LBT-999 and blood samples from 4 healthy subjects injected with [18F]LBT-999, withdrawn at 5, 15, 30 and 45 min pi. Results: With three sequential loadings (3 × 100 μL) of the Turboflow column, mean coefficients of variation were 1%, below 2%, 2% and 30.9% for matrix effect, specificity, repeatability and intermediate precision, respectively. Correlation coefficients for linearity were superior to 0.97. Limits of detection and quantification of the radiodetector were fixed at 3 and 9 c/s. Retention times for [18F]LBT-999 and the two radiometabolites detected by radio-UHPLC were 6.5, 4.8 and 9.6 min. Forty-five min after the injection, parent fraction was still predominant with 57.8% ± 25% of the total radioactivity. Conclusions: An innovative approach, allying UHPLC and Turboflow column, was developed and its sensitivity, linearity, specificity and repeatability validated. Preliminary results of the clinical trial are in accordance with literature data, demonstrating its efficiency in radiometabolites quantification.

Lysophosphatidylcholine Biomarkers of Lung Cancer Detected by Ultra-performance Liquid Chromatography Coupled with Quadrupole Time-of-flight Mass Spectrometry

Centrifugal ultrafiltration after methanol extraction of whole plasma was used as an optimal condition for the preparation of blood plasma before metabonomic studies. The plasma samples from 102 lung cancer patients and 34 healthy volunteers were prepared with this approach. With ultra-performance liquid chromatography（UPLC） coupled with quadrupole time-of-flight mass spectrometry（Q-TOF MS） analysis, the samples were investigated in order to find potential disease biomarkers. After data acquisition, orthogonal signal correction partial least squares models were built to differentiate the healthy volunteers from lung cancer patients and to identify metabolites that showed significantly different expression between the two groups. Several metabolite ions were identified as potential biomarkers according to the variable importance in the project（VIP） value in both ion modes. Five lysophosphatidylcholines were further identified as specifically lysoPC 16：0, isomer of lysoPC 16：0, lysoPC 18：0, lysoPC 18：1 and lysoPC 18：2. These results suggest that UPLC coupled with Q-TOF MS is an effective technique for the analysis of plasma metabolites in metabonomic studies.

Determination of thyreostats in bovine urine using ultra-high performance liquid chromatography-tandem mass spectrometry

Five thyreostats(TSs),namely tapazole,thiouracil,methylthiouracil,propylthiouracil,and phenylthiouracil,were determined in bovine urine using ultra-high performance liquid chromatography-tandem mass spectrometry(UHPLC-MS/MS)in positive electrospray ionization mode.Extraction and clean-up were achieved using a ChemElut cartridge with tert-butyl methyl ether,without a derivatization step.Separation was achieved on an Acquity UPLC SS T3 column.The mobile phase was acetonitrile and water containing 0.2%(v/v)formic acid.The mass spectrometer was operated in multiple reaction monitoring mode.Urine samples were spiked with TS solution at levels corresponding to 5,10,15,and 20μg/L.The accuracy(internal standard corrected)ranged from 92%to 107%,with a repeatability precision(relative standard deviation,RSD)less than 15%for all five analytes.The RSDs within-laboratory reproducibility was less than 26%.The decision limits(CCα)and detection capabilities(CCβ)were obtained from a calibration curve and were in the ranges of 3.1-6.1μg/L and 4.0-7.4μg/L,respectively.The CCαand CCβvalues were below the recommended concentration,which was set at 10μg/L.The results show that the described method is suitable for the direct detection of TSs in bovine urine.This method can also be used to determine TSs in porcine urine.

Rapid Determination of Three Kinds of Microcystins in Environmental Water Samples by Disk SPE-Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

A method of rapidly detecting three kinds of microcystins( MCs) in environmental water samples by using disk SPE- ultra high performance liquid chromatography- tandem mass spectrometry( UPLC- MS / MS) was established. Firstly,environmental water samples were extracted by disk SPE column( C_(18)),and three kinds of MCs were separated by Waters BEH C_(18) chromatographic column with acetonitrile- 0. 2% formic acid solution as the mobile phase. After the gradient elution separation,the external standard method was used for quantitative and qualitative analysis under MRM of UPLC- MS / MS. The results showed that the three kinds of MCs in the range of 0. 05- 10 μg / L showed good linear relation,and the correlation coefficients were higher than 0. 999 4,while the method detection limit was 0. 04 ng / L. Under 0. 1,1,and 5 μg / L standard addition for the same environmental sample,the average recovery was 82. 8%- 108. 8%,and the relative standard deviation of determination results was2. 1%- 10. 1%( n = 6). This method is rapid,sensitive and accurate,so it can be effectively applied in the monitoring of MCs in environmental water samples.

同位素内标稀释-UPLC-MS/MS法同时测定生活饮用水中5种消毒副产物和高氯酸盐

利用同位素稀释技术建立一种可同时测定生活饮用水中二氯乙酸、三氯乙酸、氯酸盐、亚氯酸盐和溴酸盐5种消毒副产物以及高氯酸盐的超高效液相色谱串联质谱(ID-UPLC-MS/MS)检测方法。样品过膜后加入同位素内标,采用Torus DEA色谱柱(100 mm×2.1 mm,1.7μm)分离,以0.5%氨水-1 mmol/L乙酸铵和乙腈为流动相洗脱,多反应监测(MRM)负模式(ESI-)测定,内标法定量。6种化合物线性相关系数r均大于0.990,检出限为1.5~2.1μg/L,定量限为5.0~7.0μg/L,应用该方法对399份水样进行测定,检出率为16.04%。该方法采用同位素内标稀释直接进样,分析速度快,灵敏度高,数据准确适用于饮用水国家标准(GB/T 5750.5—2023和GB/T 5750.10—2023)检测限值的要求。

基于UPLC-QTOF MS/MS技术研究甜叶菊绿原酸类成分的降解机制

本文以甜叶菊绿原酸为研究对象,利用高效液相色谱检测样品中3-咖啡酰奎宁酸(3-CQA)、4-咖啡酰奎宁酸(4-CQA)、5-咖啡酰奎宁酸(5-CQA)、咖啡酸、3,4-二咖啡酰奎宁酸(3,4-diCQA)、3,5-二咖啡酰奎宁酸(3,5-diCQA)、4,5-二咖啡酰奎宁酸(4,5-diCQA)等7种绿原酸类成分的含量,并利用超高效液相色谱-串联四极杆飞行时间质谱(UPLC-QTOF MS/MS)法鉴定绿原酸在不同诱发条件下的降解产物及降解途径。结果表明,样品中绿原酸总量在溶剂、光、热、pH值等诱发条件下均呈下降趋势。通过分析降解产物,甜叶菊绿原酸在溶剂中存放易发生烷基化反应,在光照条件下易发生降解,在高温环境中易发生脱水和烷基化,在酸碱介质中易发生水解和构型转化。综上,脱水、降解、水解和异构化是甜叶菊绿原酸受外界环境干扰时可能发生的4种损失途径。本研究不仅深化了对绿原酸理化性质的理解,也为制定有效的保存策略,确保绿原酸类成分在药品、保健品及化妆品等产品中的质量控制提供了科学依据和实践指导。

UPLC-ESI-Q-TOF/MS法测定化妆品中甲基泼尼松及其9种类似物

建立了超高效液相色谱-高分辨质谱联用仪(UPLC-ESI-Q-TOF/MS)法同时测定化妆品中甲基泼尼松及其9种类似物的检测方法。样品采用饱和氯化钠分散,乙腈提取,经C_(8)色谱柱分离,以0.1%甲酸水溶液和含0.1%甲酸的50%甲醇乙腈溶液梯度洗脱,在电喷雾离子源正离子模式(ESI^(+))下,采用全扫描模式进行数据采集,根据保留时间、母离子、子离子进行定性筛查,采用母离子的质谱响应建立含量测定方法。结果表明,10种化合物在相应质量浓度范围内线性关系良好,相关系数均大于0.99;检出限为0.27~1.98μg/g,平均回收率76.0%~96.4%,RSD为1.9%~5.7%。应用该方法对20批次样品进行筛查,共有3批检出,1批检出氯倍他索杂质B,1批检出甲基泼尼松和倍他米松杂质E,1批检出地塞米松。该方法操作简便,具有良好的选择性及准确度,能够用于化妆品中糖皮质激素的测定。

基于UPLC-Q-TOF MS及GC-MS技术分析脑血栓专利方全成分

本研究采用超高效液相色谱-四极杆飞行时间质谱(UPLC-Q-TOF MS)法和气相色谱-质谱(GC-MS)法分析脑血栓专利方的化学成分。对于非挥发性成分,采用Waters BEH C18色谱柱(100 mm×2.1 mm,1.7μm),以0.1%甲酸水溶液-乙腈为流动相进行梯度洗脱,电喷雾离子源正、负离子模式采集数据;对于挥发性成分,采用DB-5MS毛细管柱(30 m×0.25 mm,0.25μm)在程序升温下分离,EI离子源电离,质量扫描范围m/z 50~550。根据精确质荷比、二级质谱信息、NIST标准谱库检索及相关文献鉴定脑血栓专利方成分,并对化合物进行来源归属。结果表明,在脑血栓专利方中共鉴定出61种非挥发性成分以及29种挥发性成分,其中包括14种黄酮类、13种萜类、9种苷类、5种有机酸类、17种烃类、3种醇类、1种醛类、1种酯类、3种酚类、2种萜烯类以及12种其他类型的化合物。本研究可为揭示脑血栓专利方的药效物质基础提供数据支持。

全自动QuEChERS-UPLC-MS/MS法测定麦冬中19种植物生长调节剂和杀菌剂

建立全自动QuEChERS-UPLC-MS/MS法快速测定浙麦冬中19种植物生长调节剂和杀菌剂残留量的分析方法。研究使用挥发性盐提取溶液体系联合全自动QuEChERS仪器制备样品溶液,以ACQUITY UPLC BEH C_(18)色谱柱(1.7μm,3.0 mm×100 mm)进行分离,0.05%甲酸-2 mmol/L甲酸铵-乙腈为流动相进行梯度洗脱,采用正、负离子模式电离,保留时间依赖多反应监测(MRM)模式检测,以保留时间和离子丰度比定性,基质匹配外标法定量。结果表明,19种农药在5~200 ng/mL范围内线性关系良好,相关系数(r^(2))均大于0.999。方法检出限为0.048~1.68μg/kg,方法定量下限为0.16~5.61μg/kg。19种农药在空白基质中3个加标水平浓度的回收率为62.8%~117%,相对标准偏差(RSDs,n=6)为1.9%~9.1%。使用该方法对30批麦冬进行检测,样品中3-吲哚乙酸、氟醚唑、烯效唑、胺鲜酯有不同程度的检出。该研究方法高效、便捷、准确,适用于麦冬中19种植物生长调节剂和杀菌剂的测定,可满足大批量检测的需求。

经典名方保元汤UPLC特征图谱研究

目的 建立经典名方保元汤的UPLC特征图谱,为其质量标准的建立提供参考。方法 色谱柱为Agilent ZORBAX SB C18(2.1 mm×150 mm,1.8μm);流动相为乙腈-水(梯度洗脱),流速为0.20 mL/min,柱温为35℃,进样量为1μL,检测波长为203 nm。以峰5芒柄花苷为参照峰,绘制21批保元汤基准样品的UPLC特征图谱,采用《中药色谱指纹图谱相似度评价系统(2012版)》进行相似度评价。结果 21批保元汤基准样品共有12个特征峰,分别为毛蕊异黄酮葡萄糖苷(峰1)、新甘草苷(峰2)、甘草苷(峰3)、芹糖异甘草苷(峰4)、芒柄花苷(峰5)、异甘草苷(峰6)、甘草素(峰7)、人参皂苷Re(峰8)、人参皂苷Rg1(峰9)、毛蕊异黄酮(峰10)、芒柄花素(峰11)、人参皂苷Rd(峰12),相似度大于0.70。结论 所建立的UPLC特征图谱和特征峰的分析结果可为经典名方保元汤的质量控制提供参考。

UPLC-MS法测定保健食品中的乌地那非和氯地那非

目的:建立一种超高效液相色谱串联质谱法(Ultra Performance Liquid Chromatography Tandem Mass Spectrometry,UPLC-MS)法测定保健食品中非法添加乌地那非、氯地那非含量的检测方法。方法:色谱柱为Agilent ZORBX Eclipse Plus C_(18)柱(50 mm×2.1 mm,1.8μm),以0.1%甲酸水溶液-乙腈(65∶35)为流动相梯度洗脱,流速0.2 mL·min^(-1),柱温35℃;采用电喷雾离子源正模式多反应监测模式,外标法定量。结果:溶剂空白无干扰,乌地那非、氯地那非在10~200 ng·mL^(-1)时线性关系良好,相关系数分别为0.9990和0.9997;乌地那非的平均回收率为90.0%~104.3%,相对标准偏差为0.2%~3.8%;氯地那非的平均回收率为92.3%~105.8%,相对标准偏差为0.3%~2.2%;两者方法检出限、定量限分别为25μg·kg^(-1)和50μg·kg^(-1)。结论:建立的方法准确、灵敏、专属性强,适用于保健食品中非法添加乌地那非、氯地那非的痕量分析。

UPLC-MS/MS法检测3种食品中松仁过敏原

基于食品基质中松仁过敏原Pin k 2建立了一种超高效液相色谱-串联质谱法。将松仁经过研磨、脱脂、浸提、酶解后经Easy-nLC 1000-QExactive高分辨质谱仪进行分离分析,结合Uniprot蛋白数据库以及ProteinPilotTM软件对质谱图进行数据处理,经BLAST验证特异性,最终筛选3条松仁特异性肽段。方法学验证结果表明,方法在0.001~50mg/mL范围内线性关系良好,定量限为1mg/kg;在饼干、巧克力和饮料3种空白基质中的平均回收率为88.50%~107.57%,相对标准偏差不高于6.08%,基质效应为89.77%~96.13%。该方法具有灵敏度高、特异性好的优势,可应用于饼干、巧克力、饮料等食品样品中松仁过敏原的检测,为我国食品标签真实性检验及食品中隐性过敏原的检测提供技术支持。

微透析联合UPLC-MS/MS研究丹参酮ⅡA在大鼠脑脊液中的药动学

目的应用在体脑微透析联合UPLC-MS/MS探究丹参酮ⅡA(tanshinone IIA,TSA)在正常大鼠及脑缺血/再灌注(cerebral ischemia reperfusion injury,CIRI)损伤模型大鼠脑脊液中的药动学特征。方法采用增量法和减量法考察灌流液流速和TSA的质量浓度对回收率和相对释放率的影响;减量法测定探针在大鼠体内相对释放率,考察其8 h内的稳定性。应用UPLC-MS/MS技术分析大鼠在体脑透析液样品中TSA浓度,绘制脑透析液药物浓度-时间曲线,计算药动学参数。结果探针体外回收率和相对释放率基本一致,且随灌流速度的增大而减小,与TSA的浓度无关;体内相对释放率在1.5~8.0 h内基本保持不变。UPLC-MS/MS方法学考察结果均符合生物样品要求。正常大鼠和大脑中动脉阻塞/再灌注损伤模型大鼠分别腹腔注射TSA后,脑脊液中药物浓度分别在60 min和80 min达到最高值,半衰期均为69.32 min。不同剂量给药后,脑透析液中TSA浓度差异显著(P<0.05),达峰浓度、药时曲线下面积随剂量而升高,平均驻留时间为102.90~170.48 min。结论本研究建立稳定可行的TSA在体脑微透析取样体系和UPLC-MS/MS定量方法,并用于治疗时间窗内TSA脑透析液药动学研究。TSA溶液在正常和模型大鼠脑脊液中分布迅速,病理状态使TSA脑内分布浓度增加。本研究为TSA早期预防和治疗CIRI用药合理性提供依据。