共查询到18条相似文献,搜索用时 103 毫秒
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用MS/MS研究气煤吡啶抽提残煤热解加氢产物的组成结构 总被引:4,自引:1,他引:3
本文用MS/MS技术研究抚顺老虎台气煤吡啶抽提残煤热解和加氢产物中油段分的组成结构。先用硅胶色谱以地该段分进行了分离,再用MS/MS技术进行表征。鉴定出氢化菲、氢化苯并芴等多环芳烃以及苯酚类多环芳烃等结构。这一结果为研究煤的基本结构单元的结构,乃至推导原始煤的大分子结构,提供了重要的科学依据。 相似文献
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用GC/MS和FTIR技术结合气相色谱外标定量分析方法,对神府煤甲醇萃取物进行了定性和定量分析,讨论了神府煤甲醇萃取物的化学组成及其结构特征.结果显示,神府煤甲醇萃取物的GC/MS可测组分主要由多环芳烃和含氧化合物组成,其中芳烃以2~3环的烷基取代稠环芳烃为主,含氧化合物中以酮类和酯类化合物居多;结果还检测到种类较多的含氮化合物和少量的含硫、磷、氯的化合物.GC/MS不可测组分的IR分析显示,其中主要官能团有各类羟基、羰基、芳环和亚甲基、甲基等,表明其中可能存在分子量较大的稠环芳香族或其酚、酸、酮、酯类及烷基衍生物的化合物. 相似文献
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介绍了橡胶制品中多环芳烃(PAH)的危害及来源,采用气质联用(GC/MS)结合内标法,建立了测定橡胶制品中18种PAH含量的方法。制品的超声波提取液经GC/MS选择离子监测模式采集数据后,根据内标法建立标准曲线,计算其中的PAH含量。经精密度和回收率验证,本方法灵敏、准确、可靠,适用于橡胶制品中PAH含量的测定。 相似文献
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UPLC/MS/MS法测定小麦中炔草酯及其代谢物残留量 总被引:4,自引:1,他引:3
采用丙酮提取,UPLC/MS/MS测定,建立了小麦中炔草酯和其代谢物残留量的UPLC/MS/MS测定方法.添加炔草酯质量分数为0.01、0.08 mg/kg,平均回收率分别为83.5%和89.5%,相对标准偏差分别为2.0%和7.1%,检出限为0.01 mg/kg;添加代谢物质量分数为0.001、0.08 mg/kg,平均回收率分别为90.4%和89.1%,相对标准偏差分别为4.9%和8.9%,检出限为0.001 mg/kg. 相似文献
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NATHALIE WESSEL MARIE LE DÛ-LACOSTE HÉLÈNE BUDZINSKI THIERRY BURGEOT FARIDA AKCHA 《Polycyclic Aromatic Compounds》2013,33(1):52-71
Biotransformation pathways of PAHs in a flat fish, Solea solea, living in nurseries close to coastal areas and estuaries constitute a great challenge for the environmental risk. Among PAHs, Fluoranthene (Fluo) has a different chemical structure than benzo[a]pyrene (BaP), and can influence its biotransformation pathways and genotoxic potential. The aim of this study was to bring some response elements about the in vitro metabolic activation of Fluo and BaP by sole liver microsomes. The quantification of several primary metabolites of BaP and Fluo produced in vitro, following a sole liver microsomal activation, was conducted using a sensitive analytical UPLC MS/MS method. Four types of BaP metabolites (dihydrodiols, diones, OH-BaP, and 7,8-dihydro-epoxide), and three types of Fluo metabolites (2,3-dihydrodiol, 2,3-dione, and sum of OH-Fluo) were quantified. The concentration for which the metabolite production was maximal was of 40 μM and 100 μM for BaP and Fluo, respectively. The biotransformation rate was higher for Fluo (9.97%) than for BaP (6.69%).Whatever the PAH, dihydrodiols and phenols were the major metabolites produced accounting for, respectively, 50% and 30–40% for BaP, and 40 and 60% for Fluo. Despite some differences in conformation, both PAHs seem to be activated by similar pathways and the diol-epoxide appears as a predominant one. 相似文献
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Zhiyu ZHANG Changxiao LIU Duanyun SI Rong LU Xiulin YI 《Frontiers of Chemical Science and Engineering》2012,6(4):436
More and more herbal medicines are found to be the substrates of drug transporters. In this paper, chromatography/tandem mass spectrometry (LC/MS/MS) combined with radioisotope method was used for the quantification of catalpol, a traditional Chinese medicine, to study the affinity relationship between herbal medicines and transporters. Catalpol uptake experiment was carried out by using several transporters (OAT1, OCT2, OAT3, OATP1B1 and OATP2B1). And samples were precipitated with methanol and quantified with LC/MS/MS. The results show that catalpol has a good affinity with OCT2-transfected S2 cells. After studying drug-drug interaction between catalpol and 14C-tetraethylammonium (TEA), we found that catalpol is able to facilitate TEA transport mediated by OCT2, suggesting that catalpol could probably be a new promoter of OCT2. 相似文献
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以辐照含脂食品为实验材料,首次建立了液相色谱串联质谱法(HPLC-ESI-MS/MS)测定辐照含脂食品中2-十二烷基环丁酮(2-DCB)的含量。样品经正己烷提取浓缩得到脂肪,再经中性氧化铝柱净化后,采用液相色谱串联质谱法(HPLC-ESI-MS/MS)分析,多反应监测模式下(MRM)外标法定量。结果表明:方法在5~100μg/L范围内线性良好,线性相关系数为r=0.9996,定量下限为0.08 mg/kg(以脂肪计),回收率在75%~95%之间,相对标准偏差(RSD)小于10%。该方法前处理过程简便快捷,回收率高,可满足实验室大量、快速分析的需求。 相似文献
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GC/MS法建立烟用香精指纹图谱研究 总被引:4,自引:1,他引:4
采用超声辅助液液萃取法(ULLE)对8个不同批次的烟用HMT香精成分进行提取,用GC/MS对其进行定性定量分析,建立了该香精的GC/MS指纹图谱的研究方法,目的在于为烟用香精质量控制提供一种方便、快捷、可靠的分析手段。结果表明:ULLE方法具有操作简便、快速、节能、萃取效率高、重现性好等特点,适合于烟用香精成分的提取。8个批次的HMT香精的指纹图谱稳定性好,相似度高,具有很强的特征性和唯一性。通过该香精指纹图谱的建立,对日后进厂的HMT香精进行质量控制提供了依据。 相似文献