Determination of Sym-triazine Residues in Animal-derived Food by Liquid Chromatography-High Resolution Mass Spectrometry

[Objective]The research aimed to establish a liquid chromatography-high-resolution mass spectrometry for detecting residues of diclazuril,toltrazuril and its metabolites in animal-derived food.[Method]The samples were pre-treated by QuEChERS technology and detected by Exactive liquid chromatography-high resolution mass spectrometry.The liquid chromatography-high-resolution mass spectrometry for detecting the residues of diclazuril,toltrazuril,toltrazuril sulfone and toltrazuril sulfoxide in animal-derived food was established.[Result]Diclazuril,toltrazuril,toltrazuril sulfone and toltrazuril sulfoxide showed a good linear correlation in the range of 2.0-50.0μg/L（r^2〉0.99）.The average recoveries of these four compounds in bovine power at the spiked levels of 2,10 and 20μg/kg were 74.5%-90.1%,and the relative standard deviations（RSD）were 15.4%-17.5%.[Conclusion]This method was stable and reliable,and could be used to detect diclazuril,toltrazuril,toltrazuril sulfone and toltrazuril sulfoxide in animal-derived food.

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.

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.

Detecting N-nitrosamines in water treatment plants and distribution systems in China using ultra-performance liquid chromatography-tandem mass spectrometry

N-nitrosodimethylamine （NDMA） and several other N-nitrosamines have been detected as disinfection by-products in drinking waters in many countries around the world. An ultra-performance liquid chromatography- tandem mass spectrometry method with solid phase extraction sample preparation was developed to study the occurrence of N-nitrosamines in several water treatment plants and distribution systems in China. Isotope labeled N-nitrosodi-n-propylamine-dl4 （NDPA-dl4） was selected as the internal standard for quantification. The solid phase extraction procedures including pH, enrichment process and MS/MS parameters including capillary voltage, cone gas flow, cone voltage, collision energy were optimized to give average recoveries of 26% to 112% for nine N- nitrosamine species. The instrument detection limits were estimated to range from 0.5 to 5μg.L-1 for the nine N- nitrosamine species. NDMA and several other N-nitrosa- mines were found at fairly high concentrations in several water treatment plants and distribution systems. NDMA was found in all locations, and the highest concentrations in cities B, G, T, and W were 3.0, 35.7, 21.3, and 19.7 ng. L 1, respectively. A wide range of N-nitrosamines concentrations and species were observed in different locations. Higher concentrations of N-nitrosamines were detected in distribution systems that were further away from the treatment plants, suggesting that the contact time between the residual disinfectant and natural organic matter may play an important role in the formation of these compounds.

Pharmacokinetic Comparison of Four Major Bio-Active Components of Naoxintong Capsule in Normal and Acute Blood Stasis Rats Using Ultra-Performance Liquid Chromatography Coupled with Triple-Quadrupole Mass Spectrometry

Objective: To compare the pharmacokinetic differences of the main components of Naoxintong capsule(NXTC) in normal and acute blood stasis rats. Materials and Methods: Rats were subcutaneously injected with adrenaline hydrochloride twice;during the two subcutaneous injections, the rats were placed in ice water for 4 min to reproduce the model rat of acute blood stasis. The normal and acute blood stasis rats were administrated a 5.04 g/kg dose of NXTC suspension. Then, blood samples were collected from the posterior retinal venous plexus at different time points. Plasma concentrations of four major bio-active components including caffeic acid, ferulic acid, formononetin, and tanshinone IIA in NXTC were measured using ultra-performance liquid chromatography coupled with triple-quadrupole mass spectrometry. Phoenix Win Nonlin v6.2 software was used to calculate the pharmacokinetic parameters. Results: Compared with the normal rats, the acute blood stasis rats showed a significant decrease in C_(max) of ferulic acid and formononetin, AUC_(all) of caffeic acid and ferulic acid, and AUC_(INF_obs) of ferulic acid. Conversely, an increase in the Vz_F_obs and MRT_(last) of ferulic acid and caffeic acid was observed. These findings demonstrate that the absorption of the four NXTC components was weakened in the acute blood stasis rats and that the elimination time was prolonged. Conclusions: The significant difference in some parameters of the four NXTC components between the normal and acute blood stasis rats might be caused by an increase in blood viscosity and the subsequent slowing down of blood flow in the acute blood stasis rats. The pharmacokinetic study conducted in pathological state can provide important information and scientific basis for further rational clinical application of NXTC.

Rapid Differentiation of Aconiti Kusnezoffii Radix from Different Geographic Origins Using Ultra-Performance Liquid Chromatography Coupled with Time-of-Flight Mass Spectrometry

Objective:There are different geographic origins of Aconiti Kusnezoffii Radixs(AKRs)sold in the market with different quality.This study aims to establish a rapid analysis method to distinguish the different geographic origins of AKRs and to realize the rapid evaluation of their quality.Methods:An ultra-performance liquid chromatography coupled with time-of-flight mass spectrometry(UPLC-Q-TOF MS)method was utilized to acquire the constituents'information of AKRs from different geographic origins.MSE data and Progenesis QI software were employed to identify the chemical constitutes.Principal component analysis(PCA)was applied to comparing MS data to find the chemical markers of AKRs from different geographic origins.Results:Twenty-three components were detected and 17 out of them were identified,including diester-diterpenoid alkaloids,monoester-diterpenoid alkaloids,and amine-diterpenoid alkaloids.Three pairs of isomers were detected and two of them were distinguished by the retention time of standard samples.Thirteen chemical markers were screened out through PCA and orthogonal partial least square discriminant analysis.Through detecting Napelline or isomer of Napelline(m/z 360.2530)and Aconifine(m/z 662.3170),AKRs from inner Mongolia autonomous could be screened.According to the existence of benzoylaconine(m/z 604.3108)and Indaconitine(m/z 630.3159),it could be confirmed that the AKRs are from Xinjiang Uygur autonomous.AKRs that cannot detect compounds above-mentioned could be from Liaoning or Shanxi Province.Conclusions:The chemical profile could be used not only to distinguish the AKRs from different geographic origins but also to identify the true and false of AKRs.This study lays a foundation for the study of efficacy and toxic of AKRs.

Simultaneous Determination of Six Compounds in Rat Plasma by Ultra-Performance Liquid Chromatography with Tandem Mass Spectrometry: Application in the Pharmacokinetic Study of Qing Gan-Shu Yu-Fang

A rapid and high selective ultra-performance liquid chromatography(UPLC)with tandem mass spectrometry method for simultaneous determination of six compounds including albiflorin,paeoniflorin,picroside I,picroside II,saikosaponin A,and saikosaponin D in rat plasma was developed and validated using butyl p-hydroxybenzoate as an internal standard.One-step direct protein precipitation with acetonitrile was used to extract the compounds from the rat plasma samples.Chromatographic separation was achieved using an ACQUITY UPLC BEH C18 column(100 mm×2.1 mm,1.7μm)at a flow rate of 0.4 m L/min,using gradient mode containing 0.1%formic acid in water and acetonitrile were used as the Mobile phase A and B.Electrospray ionization in negative ion mode and multiple reaction monitoring were used to identify and quantify active components.Calibration curves showed good linearity(R^2>0.9908)over a wide concentration range for all compounds.The intra-and interday precision(relative standard deviation)ranged 2.4%–7.0%and 2.6%–8.0%,respectively.The accuracy(relative error)was from-13.0%to 13.2%at all quality control levels.The recovery ranged from 81.1%to 92.5%.The validated method was successfully applied to pharmacokinetic study in rats after oral administration of Qing Gan-Shu Yu-Fang.The results show that one can draw a conclusion that these six active ingredients can be quickly absorbed and play a pharmacodynamic role rapidly in vivo.

An Automatic Solid Phase Extraction and Ultra-Performance Liquid Chromatography Tandem Mass Spectrometry for Determination of Seven Microcystins at Ultra-Trace Levels in Surface Water

A method was developed for the detection of seven microcystins(microcystin-LR, RR, YR, LA, LY, LW and LF) in surface water using automatic solid-phase extraction(A-SPE) coupled with ultra-performance liquid chromatography tandem mass spectrometry(UPLC-MS/MS). The automated solid-phase extraction system was used to extract microcystins(MCs) from water samples. UPLC-MS/MS was used to determine MCs concentrations in just 5 min. Method detection limits were from 0.3 to 0.9 ng/L, microcystin recoveries ranged from 83.8% to 114%, and the relative standard deviation(RSD) varied from 5.6% to 12.5%. This analytical approach was found to be simple, highly sensitive, accurate, which required little manual operation. Additionally, to validate this analytical method, A-SPE+UPLC-MS/MS was applied to characterize the concentration of MCs in Taihu Lake, Wuxi, China.

Ultra-performance Liquid Chromatography-Quadrupole/Time-of-Flight Mass Spectrometry Based Bile and Urine Metabonomics Study on the Ameliorative Effects of Curcuma wenyujin Rhizoma on Acute Blood Stasis in Rats

Background: Curcuma wenyujin rhizome(CWR) is a commonly used Chinese herbal medicine for treating blood stasis in China for 1000 of years. However, the underlying mechanism of CWR remains unclear. Aims and Objectives: The purpose of this study is to clarify the bioactive mechanism of CWR in treating blood stasis. Materials and Methods: In this study, pharmacological indexes, including hemorheology and four blood coagulation indexes were tested. Bile and urine metabolomics were engaged by UPLC-Q/TOF-MS. Multivariate statistical analysis were used to screen out differential endogenous metabolites. Results: The results indicated that CWR significantly ameliorated the hemorheology and coagulation functions of acute blood stasis(ABS) model rats. Moreover, 27 endogenous metabolites between the CWR group and the ABS group were screened, and the levels were all improved to certain degrees by CWR preadministration. Metabonomics results indicated that ABS was mainly related to linoleic acid metabolism, arachidonic acid metabolism, glycerophospholipid metabolism, sphingolipid metabolism, pentose and glucuronate intercereasonversions, steroid hormone biosynthesis, and primary bile acid biosynthesis. Conclusion: In a word, the metabolomics method is consistent with the holistic view of traditional Chinese medicine(TCM) that can be a powerful means to illustrate the biological activity mechanism of CWR in treating blood stasis and to offer research demonstration for further study on the effector mechanism of TCM.

Perfluoropentane-based oxygen-loaded nanodroplets reduce microglial activation through metabolic reprogramming

Microglia,the primary immune cells within the brain,have gained recognition as a promising therapeutic target for managing neurodegenerative diseases within the central nervous system,including Parkinson’s disease.Nanoscale perfluorocarbon droplets have been reported to not only possess a high oxygen-carrying capacity,but also exhibit remarkable anti-inflammatory properties.However,the role of perfluoropentane in microglia-mediated central inflammatory reactions remains poorly understood.In this study,we developed perfluoropentane-based oxygen-loaded nanodroplets(PFP-OLNDs)and found that pretreatment with these droplets suppressed the lipopolysaccharide-induced activation of M1-type microglia in vitro and in vivo,and suppressed microglial activation in a mouse model of Parkinson’s disease.Microglial suppression led to a reduction in the inflammatory response,oxidative stress,and cell migration capacity in vitro.Consequently,the neurotoxic effects were mitigated,which alleviated neuronal degeneration.Additionally,ultrahigh-performance liquid chromatography–tandem mass spectrometry showed that the anti-inflammatory effects of PFP-OLNDs mainly resulted from the modulation of microglial metabolic reprogramming.We further showed that PFP-OLNDs regulated microglial metabolic reprogramming through the AKT-mTOR-HIF-1αpathway.Collectively,our findings suggest that the novel PFP-OLNDs constructed in this study alleviate microglia-mediated central inflammatory reactions through metabolic reprogramming.

超高效液相色谱-四极杆-飞行时间高分辨质谱用于化妆品中15种前列腺素类似物的快速筛查和测定

建立了超高效液相色谱-四极杆-飞行时间高分辨质谱(UPLC-Q-TOF MS)快速筛查和测定化妆品中15种前列腺素类似物的方法。样品以饱和氯化钠作为分散剂(蜡质类样品以四氢呋喃分散),经乙腈提取,离心取上清液过滤后,采用Poroshell 120 EC-C_(18)柱(150 mm×3.0 mm,2.7μm)分离,以5 mmol/L甲酸铵(含0.1%甲酸)-乙腈为流动相梯度洗脱。在ESI正离子模式下,采用Targeted MS/MS模式采集15种前列腺素类似物的质谱信息,构建筛查数据库进行快速筛查,确证后的目标物通过外标法定量。结果表明,15种前列腺素类似物的线性关系良好,相关系数(r^(2))均大于0.99;检出限为0.3~17.6μg/g,定量下限为1.1~58.8μg/g。在低、中、高3个加标水平下,水剂、膏霜、乳类、粉类、凝胶5类化妆品基质的回收率为70.1%~134%,相对标准偏差不大于7.5%。该方法简单高效、准确度好,可用于化妆品中前列腺素类似物的定性确证和定量分析,为化妆品风险识别提供技术支撑。

基于UHPLC-Q-Exactive Orbitrap HRMS技术结合化学计量学方法的不同干燥处理杜仲叶成分分析

采用基于液质联用的非靶向代谢组学技术结合化学计量学数据自动解析软件AntDAS-LCHRMS分析了4种不同干燥处理(冻干、热泵烘干、电热烘干、晒干)杜仲叶样本中的化合物。杜仲叶样本数据由超高效液相色谱-四极杆-静电场轨道阱高分辨质谱(UHPLC-Q-Exactive Orbitrap HRMS)分别在正、负离子模式下进行采集,经AntDAS-LCHRMS软件解析,共鉴定出71种差异性化合物,经标准品验证确定40种化合物,包括环烯醚萜类、有机酸类、黄酮类、氨基酸类、核苷类、维生素类等9类物质。其中,正、负离子模式下均可识别并验证的化合物有车叶草苷、绿原酸、芦丁、异槲皮苷、车叶草苷酸、京尼平苷等25种化合物。层次聚类分析(HCA)及主成分分析(PCA)结果均显示,相同处理的杜仲叶样本各自聚成一类,不同处理的杜仲叶样本可明显区分。热图分析进一步揭示了不同干燥处理杜仲叶样本中差异性化合物的含量变化。晒干处理样本中苯丙氨酸及色氨酸等氨基酸类物质的水平较高;冻干及热泵烘干处理样本中有机酸类、环烯醚萜类、糖类等含量较高;电热烘干样本中核苷类、黄酮类物质的含量较高;黄酮类物质在冻干、热泵烘干及晒干样本中差异较小。研究结果为不同干燥处理杜仲叶的成分分析、品质评价及其开发应用提供了科学依据,也可为其他复杂药用植物体系的化学成分分析提供参考。

超高效液相色谱-四极杆-飞行时间高分辨质谱用于化妆品中18种非甾体抗炎药筛查和测定

建立了超高效液相色谱-四极杆-飞行时间高分辨质谱(UPLC-Q-TOF MS)快速筛查和测定化妆品中18种非甾体抗炎药(NSAIDs)的方法。样品采用60%乙腈水溶液超声提取,以ACQUITY UPLC BEH C_(18)(100 mm×2.1 mm,1.7μm)色谱柱分离,0.1%甲酸水和0.1%甲酸乙腈为流动相梯度洗脱。在ESI正离子扫描模式下,采用Target MS/MS模式采集化合物的质谱信息构建筛查数据库,以保留时间、一级母离子精确质量数、同位素丰度比和二级子离子谱库匹配进行快速筛查,以基质匹配外标法进行定量分析。结果表明18种化合物的线性关系良好,相关系数(r^(2))均大于0.99;检出限为0.001~0.050μg/g,定量下限为0.004~0.150μg/g。低、中、高3个加标水平下,膏霜及水剂两种化妆品基质的平均回收率为70.7%~116%,日内相对标准偏差(RSD,n=6)为0.70%~7.5%,日间RSD(n=3)为3.0%~14%。该方法前处理简单高效、准确度好、分析速度快,筛查结果准确,可用于化妆品中非甾体抗炎药的定性确证和定量分析,为化妆品风险识别提供技术手段。

消瘀泄浊饮中活性成分鉴定以及HPLC法测定其中5种关键成分

目的利用高效液相色谱联合质谱技术鉴定消瘀泄浊饮中的活性成分,并利用HPLC法测定毛蕊异黄酮葡萄糖苷、大黄素、芦荟大黄素、杯苋甾酮、苦杏仁苷这5种成分的含量。方法采用液质联用技术测定消瘀泄浊饮中的生物活性成分,色谱柱:Waters HSS T3(100 mm×2.1 mm,1.8μm),流动相为0.1%甲酸-水溶液→0.1%甲酸-乙腈-异丙醇,梯度洗脱;流速:0.3 mL/min;柱温:40℃。高分辨质谱:鞘气40 Arb;辅助气10 Arb;离子喷雾电压3000 V/-2800 V;温度350℃;离子传输管温度320℃;扫描模式为Full-scan MS2模式。采用Progenesis QI进行基线过滤、峰识别、积分、保留时间校正、峰对齐,对比公共数据库和实验室自建数据库后得到消瘀泄浊饮中的生物活性成分。选择Sharpsil-U C_(18)色谱柱;流动相为甲醇→超纯水;梯度洗脱;流速:1.0 mL/min;柱温:30℃;进样量:10μL;检测波长:210 nm(苦杏仁苷、杯苋甾酮),260 nm(毛蕊异黄酮葡萄糖苷、大黄素、芦荟大黄素)。结果从消瘀泄浊饮中共找到276种生物活性成分,其中负离子模式下找到119种,正离子模式下找到157种。选择毛蕊异黄酮葡萄糖苷、大黄素、芦荟大黄素、杯苋甾酮、苦杏仁苷为消瘀泄浊饮的指标成分。各成分均能有效检出,分离度良好,阴性无干扰;5种成分在测定的进样浓度范围内与峰面积线性关系良好;平均加样回收率为99.94%~101.07%;RSD为0.78%~2.27%。结论液质联用技术可以有效鉴定消瘀泄浊饮中的生物活性成分,所建立的HPLC法稳定性好,特异性强,可以为消瘀泄浊饮的质量控制和评价提供参考依据。

超高效液相色谱-四极杆-飞行时间-高分辨质谱法分析6种李果实中的代谢物差异性

目的采用超高效液相色谱-四极杆-飞行时间高分辨质谱法分析6种李果实中的代谢物差异。方法使用天然产物高分辨二级谱库、代谢物高分辨二级谱库和相关数据库等对不同李果实样品中的代谢产物进行数据分析,利用峰面积归一化法计算各化学成分的相对含量,采用主成分分析方法、偏最小二乘法判别分析和方差分析等方法,分析不同李果实样品中代谢产物的差异。结果共分析鉴定了130个化学成分,其中包括28个黄酮类、25个脂肪酸、18个萜烯类、11个核苷酸、10个酚酸、9个香豆素类、8个含氮化合物、6个酚类以及15个其他类化合物;在所鉴定的130个化合物中,有123个化合物对各组李果实均值间的差异具有统计学意义(P<0.05);6组不同品种李果实的数据间具备很好的区分度,贡献最大的化合物共有32个。结论6个品种李果实存在相同种类的代谢产物,各代谢产物在不同品种李果实中的相对含量存在显著差异性,为李果品种选育、区分以及产地溯源等提供参考。

超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法检测婴幼儿配方奶粉中苯并三唑类紫外线吸收剂

目的建立超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法检测婴幼儿配方奶粉中苯并三唑类紫外线吸收剂。方法样品经乙腈提取,-20℃冷冻1 h,离心取上清后上机测定。以ACQUITY UPLC BEH C8色谱柱(100 mm×2.1 mm,1.7μm)为分析柱,甲醇-5 mmol/L乙酸铵为流动相进行梯度洗脱分离,采用电喷雾电离源正离子模式,高分辨质谱全扫描模式检测,基质匹配外标法定量。结果6种苯并三唑类紫外线吸收剂在0.05~10.00ng/mL范围内线性关系良好,相关系数均大于等于0.9977。空白样品的加标回收率为50.39%~109.00%,相对标准偏差为2.88%~17.99%,方法检出限为0.01~0.97ng/g,定量限为0.04~3.23ng/g。结论该方法操作便捷、快速,能够准确检测婴幼儿配方奶粉中6种苯并三唑类紫外线吸收剂的含量,对于婴幼儿食品安全监测具有良好的现实意义。

高效液相色谱-四级杆/飞行时间高分辨质谱法检测保健食品中非法添加药物

建立高效液相色谱-四级杆/飞行时间高分辨质谱法检测保健食品中非法添加药物西布曲明和酚酞的分析方法。通过保留时间对西布曲明和酚酞进行定性分析,通过标准曲线法对保健食品中西布曲明和酚酞进行定量分析。结果表明,2种药物标准品的溶液浓度与检测响应具有良好的线性关系,其相关系数(R~2)均大于0.99,该方法简单、快速、准确,适合用于保健食品中非法添加物的筛查。

超高效液相色谱-高分辨质谱快速筛选贴膏剂中170种兴奋剂

目的:建立超高效液相色谱-高分辨质谱(UPLC-HRMS)快速筛选贴膏剂中兴奋剂的检测方法,以加强药源性兴奋剂风险防控。方法:贴膏剂样品除去外衬后,分别采用叔丁基甲醚和无水乙醇超声提取,合并提取液后氮气流吹干,采用甲醇溶解残留物,过滤后采用赛默飞Vanquish-Q Exactive Plus超高效液相色谱-高分辨质谱仪检测。采用安捷伦ZORBAX Eclipse C18(2.1×100 mm,1.8μm)色谱柱分离,柱温为40℃,进样体积为3μL,以10 mmol/L甲酸铵(含0.1%甲酸,pH 3.5)和乙腈为流动相进行梯度洗脱,分别在电喷雾正、负离子模式下,以全扫描/数据依赖的二级质谱(Full MS/dd-MS2)扫描模式检测。结果:该方法具有良好的选择性,样品经前处理后在48 h内检测具有稳定性,92种兴奋剂检出限约为3 ng/g,31种兴奋剂检出限约为6 ng/g,47种兴奋剂检出限约为30 ng/g。采用该方法检测10例贴膏剂样品,检出4例含士的宁,3例含去甲乌药碱,3例含麻黄碱。结论:本研究建立了超高效液相色谱-高分辨质谱(UPLC-HRMS)快速筛选贴膏剂中9个类别共170种兴奋剂的检测方法,该方法简单、灵敏、可靠,适用于贴膏剂中兴奋剂的快速筛选。

液相色谱-高分辨质谱法定性定量检测血液透析器中3种未知可沥滤物

参考血液透析器说明书以及GB/T 14232.1—2020,分别采用水和乙醇-水混合溶液浸提血液透析器中可沥滤物,液相色谱-高分辨质谱法采集浸提液中未知可沥滤物的色谱、质谱信息,并以二甲基乙酰胺为例介绍了定性流程,外标法测定了可沥滤物的含量。结果显示,在1.7,2.1,2.5 min附近发现3种可沥滤物,经质谱解析和对照品比对,分别确定为2-吡咯烷酮、二甲基乙酰胺和N-甲基吡咯烷酮。3种可沥滤物的质量浓度分别在0.089 6~4.48 mg·L^(-1),0.469 5~18.78 mg·L^(-1)和0.102 6~5.130 mg·L^(-1)内与其对应的定量离子的峰面积呈线性关系,检出限(3S/N)分别为0.005 1,0.009 9,0.010 5μg·g-1。方法用于28个血液透析器的分析,乙醇-水浸提液中3种可沥滤物的溶出量高于水浸提液中的,最大溶出量分别为376.7,2 668.4,517.8μg。

基于血液代谢组学分析缺血性心脏病患者疾病进程的代谢紊乱特征

本研究以47例心绞痛患者、51例心肌梗死患者和80例心力衰竭患者的血浆作为样本,结合超高效液相色谱-高分辨质谱(UPLC-HRMS)技术和化学计量学方法,分析缺血性心脏病患者疾病进程的代谢紊乱特征。实验共定性、定量鉴定97种内源性代谢物,基于t检验、主成分分析、偏最小二乘-判别分析、变量重要性投影等方法,分别筛选出28种和32种可区分心绞痛与心肌梗死患者,心肌梗死与心力衰竭患者的差异性特征代谢物。代谢通路分析结果表明,从心绞痛到心肌梗死,以及从心肌梗死到心力衰竭的疾病进程中,氨基酸代谢和三羧酸循环等能量代谢均发生了紊乱;从心肌梗死到心力衰竭的疾病进程中,以甘油磷脂代谢和脂肪酸生物合成为代表的脂质代谢显著紊乱;通过分析受试者工作曲线(ROC),糖胆酸、富马酸、棕榈酸、肌钙蛋白、高密度脂蛋白、谷丙转氨酶和谷草转氨酶等联合指标可提高心肌梗死诊断精度,ROC曲线下面积(AUC)值达到1.0000;瓜氨酸、柠檬酸、硬脂酸、甘油磷酸胆碱和NT-proBNP联合指标可提高心力衰竭诊断精度,AUC值达到0.9570。本研究可为缺血性心脏病患者的精准诊断和疾病发展过程中的药物、营养干预提供重要的代谢靶标。