气相色谱-质谱法分析硫芥子气及相关化合物

用气相色谱－质谱法对含硫芥子气类化合物进行了分析。探讨了长链芥子气的电子轰击电离的质谱规律，并对待测化合物的色谱保留数据进行了研究，在给定条件下，各种待测含硫芥子气在气相色谱柱中能有效的分离和鉴定。     

气相色谱-质谱法分析芥子气的氯氨消毒产物

用气相色谱／质谱法分析了芥子气的氯胺Ｔ、氯胺Ｂ的消毒产物。根据消毒剂和消毒产物的性质，研究了不同消毒液样品制备方法。探讨了消毒剂过量和不过量时对消毒反应的影响。     

搅拌棒萃取-热解吸气相色谱法测定水中倍半芥子气

建立了一种以SBSE萃取与热解吸-气相色谱-火焰光度法联用技术为基础的测定水中倍半芥子气的方法。对比了SBSE和固相微萃取(SPME)对水中的倍半芥子气的萃取回收率,实验结果表明,SBSE对倍半芥子气的萃取率在22.47%～22.60%之间,SPME对倍半芥子气的萃取率为0.4%。研究了萃取时间、解吸附时间、样品溶液pH值、萃取温度对萃取回收率的影响,选择萃取时间为20min、一级解吸时间为10min、二级解吸时间为4min、样品溶液pH值为7.0、萃取温度为25℃。检测倍半芥子气的线性范围为0.462～23.1μg/L,最低检出限为0.0924μg/L(S/N=3)。该方法已成功应用于河水的检测。     

芥子气纯度测定不确定度分析与评定

采用酸碱滴定法测定芥子气纯度,对测量结果的不确定度进行评定。分析了测定过程中不确定度来源,包括滴定剂的标定、消耗滴定剂体积、样品称量等引入的不确定度及其计算方法,最后合成得到标准不确定度。当芥子气纯度测定结果为94.78%时,扩展不确定度为0.34%(k=2)。实验结果表明,样品称量引入的不确定度对测量结果的影响最大。     

芥子气过氧化物消毒产物的气相色谱-质谱测定

采用气相色谱-质谱(GC-MS)技术对芥子气的过氧化物消毒产物进行了分离和检测。不完全消毒定性检测到芥子气的6种氧化产物,未检测到其水解产物。增加消毒剂用量和延长消毒时间都会使消毒产物进一步氧化,最终变成二乙烯基砜、氯乙基乙烯基砜和芥子砜3种消毒产物。定量分析得出,1 mol芥子气生成的最终消毒产物分别为二乙烯基砜0.193 mol,氯乙基乙烯基砜0.145 mol,芥子砜0.504 mol。3种化合物线性范围1~30 mg/L,加标回收率在57%~78%之间,相对标准偏差小于3.1%,检出限均为0.5 mg/L。     

有机聚合物整体柱的改性与应用进展

有机聚合物整体柱具有制备简单、易于改性和通透性好的优点,不仅可作为微柱色谱分离分析的固定相,而且可用作样品纯化富集的载体,广泛应用于基体复杂的生化样品分析领域.该文综述了近年来有机聚合物整体柱的研究进展,重点介绍了其制备方法、改性技术及在生化样品预处理领域的研究动态.针对其制备方法,从制备过程、制备原料(单体、交联剂、...     

超高效液相色谱-串联质谱法同时检测人血浆中6种芥子气染毒标识物

针对芥子气( HD)染毒血浆的溯源性分析需求,采用超高效液相色谱-串联质谱技术( UHPLC-MS/MS),建立了人血浆中6种HD生物标识物( TDG,TDGO,SMO,SBMSE,MSMTESE,SBSNAE)的高灵敏度和专属性检测方法。应用甲醇和乙腈混合有机溶剂沉淀HD染毒血浆中的蛋白,然后用HLB柱固相萃取( SPE)纯化,经超高效液相色谱梯度洗脱分离,在三重四极杆串联质谱正离子多反应监测( MRM)模式下进行定性与定量检测。结果表明,6种目标物的线性范围为0.05~500 ng/mL(R2=0.9840~0.9955),检测限在0.01~1.0 ng/mL之间,各分析物的精密度(n=5)≤5.5%,加标回收率在86.5%~110.8%之间。本方法通过SPE的引入和UHPLC程序的优化,有效地解决了基质背景对分析可靠性的影响问题,并成功应用于国际禁止化学武器组织( OPCW)第5次生物医学样品分析演练HD染毒血浆样品的鉴定。     

人工尿样中芥子气-谷胱甘肽加合物的气相色谱-质谱法检测

该文以气相色谱-质谱法测定人工尿样中的芥子气-谷胱甘肽加合物的β-裂解产物1,1′-磺酰基二(2-甲巯基)乙烷(SBMTE)。采用固相萃取(SPE)及固相支持液-液萃取(SLE)两种方法对尿样中的SBMTE进行富集净化,并对两种方法的影响因素进行了优化。采用中等极性毛细管色谱柱(DB-17MS)分离,以电子轰击源(EI)质谱选择离子模式(SIM)检测,内标法定量。结果表明,以SPE/GC-MS方法检测,SBMTE在1~100μg/L范围内线性关系良好,相关系数r为0.998 4,检出限(LOD)为0.1μg/L,回收率大于90%;以SLE/GC-MS方法检测,SBMTE在2~150μg/L范围内线性关系良好,相关系数r为0.998 8,检出限为0.5μg/L,回收率大于90%。SPE方法适用于直接检测空白尿样中添加SBMTE或芥子气染毒真实尿样还原后样品的进一步净化处理,SLE方法可应用于芥子气染毒后真实尿样的确证检测和溯源性检测。     

固相萃取-气相色谱-质谱法检测染毒尿样中芥子气-谷胱甘肽加合物的β-裂解产物

合成并纯化了芥子气-谷胱甘肽的β-裂解产物1,1′-磺酰基二(2-甲巯基)乙烷(SBMTE),纯度为98.9%.建立了固相萃取-气相色谱质谱法检测染毒尿样中SBMTE的方法,对尿样中SBMTE的提取富集、 Oasis HLB固相萃取柱净化条件等因素进行了优化.实验中采用DB-5MS毛细管柱进行分离,以化学电离源(CI)质谱选择离子模式(SIM)进行检测,并通过内标法定量.SBMTE的线性范围为1～100 ng/mL,r=0.9991,回收率为89.0%～92.6%,检出限为0.5 ng/mL.方法满足芥子气中毒人群尿中SBMTE的检测要求.     

洗脱法制备薄层色谱

前言色谱是一种有效的分离手段,但分离后的组分一般色谱自身不能定性,定性要借助于标准样品或者其它仪器。薄层色谱对于气相色谱和液相色谱而言它是开放床,可以直接对分离组分显色定性。若分析未知样品,或者又无标样时,就需要把分离的各个组分从薄层板上提取下来,用其它仪器如红外光谱、紫外光谱、质谱、核磁共振波谱测定结构。应用制备薄层色谱提纯或者制备少量样品是很必要的。制备薄层色谱     

Screening hydrolysis products of sulfur mustard agents by high-performance liquid chromatography with inductively coupled plasma mass spectrometry detection

Sulfur mustard (HD), bis(2-chloroethyl)sulfide, is one of a class of mustard agents which are chemical warfare agents. The main chemical warfare hydrolysis degradation products of sulfur mustards are: thiodiglycol, bis(2-hydroxyethylthio)methane, 1,2-bis(2-hydroxyethylthio)ethane, 1,3-bis(2-hydroxyethylthio)propane, and 1,4-bis(2-hydroxyethylthio)butane. The aim of this study is to identify these five hydrolysis degradation products utilizing reversed-phase high-performance liquid chromatography coupled with inductively coupled plasma mass spectrometry (ICP-MS) for element-specific sulfur detection using a collision/reaction cell and electrospray ionization mass spectrometry to confirm the identification. To date, this is the first study utilizing ICP-MS with ³²S element-specific detection for the analysis of vesicant chemical warfare agent degradation products.     

芥末种子中脂肪酸的 GC－MS分析

报道了用色谱－质谱分析芥末种中脂肪酸成分及其含量,结果表明芥末种子中含有丰富的饱和的和不饱和的脂肪酸及其乙酯,为芥末种子的开发利用提供了信息。     

Use of High Pressure Liquid Chromatography and Thin Layer Chromatography for the Separation and Detection of Testosterone and its Metabolites from in vitro Incubation Mixtures

Abstract

Testosterone and its 6β-, 7α-, and 16α-hydroxylated metabolites were resolved by high pressure liquid chromatography and thin layer chromatography. Separation by HPLC was achieved in less than 45 min on a microparticulate silica gel column using isocratic elution with isopro-panol:tetrahydrofuran:hexane (5:15:80) as the mobile phase. TLC systems utilizing silica gel on glass and plastic plates, and polysilicic acid on glass fiber sheets are presented. The monohydroxylated metabolites of testosterone formed during incubation of (¹⁴C)-testosterone with liver postmitochondrial preparations from adult male rats pre-treated with phenobarbital or Aroclor 1254 were separated and quantitated by both HPLC and TLC. The results using both techniques are compared with those obtained by paper chromatography.     

Use of HPTLC,HPLC, and Densitometry for Qualitative Separation of Indole Alkaloids from Rauvolfia serpentina Roots

JPC – Journal of Planar Chromatography – Modern TLC - High-performance thin-layer chromatography (HPTLC) has been used for normal-phase separation of the components of hexane,...     

Application of Thin-Layer Chromatography and Gas Chromatography—Mass Spectrometry for Evaluation of the Chemical Stability of Hexyl Nicotinate

JPC – Journal of Planar Chromatography – Modern TLC - In this study, thin-layer chromatography with densitometry and gas chromatography—mass spectrometry (GC—MS) were used...     

Rapid Isolation of a Dipeptidyl Peptidase IV Inhibitor from Fritillaria cirrhosa by Thin-Layer Chromatography–Bioautography and Mass Spectrometry-Directed Autopurification System

JPC – Journal of Planar Chromatography – Modern TLC - A thin-layer chromatography (TLC)-bioautography-mass spectrometry (MS) method coupled with a liquid chromatography- MS-controlled...     

New Interfaces for Coupling TLC with TOF SIMS

JPC – Journal of Planar Chromatography – Modern TLC - Two interfaces have been tested for coupling thin-layer chromatography (TLC) with time-of-flight secondary-ion mass spectrometry...     

Rapid monitoring of sulfur mustard degradation in solution by headspace solid-phase microextraction sampling and gas chromatography mass spectrometry

A method using headspace solid-phase microextraction (HS-SPME) followed by gas chromatography/mass spectrometry (GC/MS) analysis has been developed to gain insight into the degradation of the chemical warfare agent sulfur mustard in solution. Specifically, the described approach simplifies the sample preparation for GC/MS analysis to provide a rapid determination of changes in sulfur mustard abundance. These results were found to be consistent with those obtained using liquid-liquid extraction (LLE) GC/MS. The utility of the described approach was further demonstrated by the investigation of the degradation process in a complex matrix with surfactant added to assist solvation of sulfur mustard. A more rapid reduction in sulfur mustard abundance was observed using the HS-SPME approach with surfactant present and was similar to results from LLE experiments. Significantly, this study demonstrates that HS-SPME can simplify the sample preparation for GC/MS analysis to monitor changes in sulfur mustard abundance in solution more rapidly, and with less solvent and reagent usage than LLE.     

A simple and controlled oxidative decontamination of sulfur mustard and its simulants using ozone gas

A simple and efficient oxidative decontamination method was developed for sulfur mustard (HD), a potential chemical warfare agent. The method involves treatment of chemical warfare agent HD and its simulants, i.e., dimethyl sulfide, diethyl sulfide, and 2-chloroethyl ethyl sulfide with ozone gas at ambient conditions in acetonitrile solvent. Ozone gas readily oxidizes sulfur mustard in a controlled manner to give its corresponding nontoxic sulfoxide. This transformation is selective and takes place even at subzero temperatures. The oxidation products of HD and its simulants were monitored and quantified by gas chromatography and gas chromatography–mass spectrometry.