简介:目的:研究苔类植物石地钱中具有微管抑制活性的大环双联苄类化合物。方法:在具有微管抑制活性的石地钱提取部分中,利用LC-DAD/MS/MS方法检测其中的大环双联苄,通过制备高效液相分离和纯化此类化合物、光谱方法鉴定其结构,利用稳定表达EYFP—tubulin的HeLa细胞株考察其抑制微管活性。结果:LC—DAD/MS/MS检测到11个双联苄类化合物,经分离纯化得到其中8个并鉴定为:异地前素C(1)、片叶苔素C(2)、新地前素A(3)、地前素A(4)、异片叶苔素C(5)、片叶苔素B(6)、羽苔素E(7)和地前素C(8)。化合物4和8具有显著的抑制微管解聚活性。结论:化合物3—7均为首次从该植物中分得,并首次报道联苄类化合物具有微管抑制活性。
简介:目的:通过对紫薯花色苷(anthocyaninsfrompurplesweetpotato,APSP)组分的分离、鉴定和相对含量的分析,为紫薯花色苷在食品工业中的应用提供方法借鉴和理论依据。方法:取实验室自制的APSP粉末25mg,置于5mL容量瓶中,用甲醇水混合液(甲醇∶水=2∶1)定容,所得溶液过0.45μm滤膜,利用LC-MS/MS对滤液中的成分进行分离、鉴定,并进行相对含量的计算。结果:根据LC-MS/MS结果可知,分离得到8种组分,并依据相关文献的报道,鉴定其中6种分别为矢车菊素3-咖啡酰槐糖苷-5-葡糖苷(Cyanidin3-caffeoylsophoroside-5-glucoside)、芍药素3-咖啡酰槐糖苷-5-葡糖苷(Peonidin3-caffeoylsophoroside-5-glucoside)、矢车菊素3-(6"-咖啡酰-6"’-阿魏酰槐糖苷)-5-葡糖苷(Cyanidin3-(6"-caffeoyl-6"’-feruloylsophoroside-5-glucoside))、芍药素-双咖啡酰槐糖苷-5-葡糖苷(Peonidindicaffeoylsophoroside-5-glucoside)、芍药素3-咖啡酰-对-羟基苯甲酰槐糖苷-5-葡糖苷(Peonidin3-caffeoylp-hydroxybenzoyl-sophoroside-5-glucoside)、芍药素3-咖啡酰-阿魏酰槐糖苷-5-葡糖苷(Peonidin-caffeoylferuloylsophoroside-5-glucoside),另外2种组分未知,同时对各组分的相对含量进行了比较。结论:利用所建立的LC-MS/MS方法可对APSP进行分离、鉴定和相对含量的分析。
简介:为快速、准确检测烟草中高级脂肪酸含量,建立了测定烟草中7种高级脂肪酸的液相色谱-串联质谱(LC-MS/MS)方法。样品经KOH的甲醇溶液皂化,二氯甲烷萃取后,十七烷酸作内标直接进样LC-MS/MS分析定量。结果表明各高级脂肪酸峰面积与内标峰面积的比值和其浓度与内标浓度之比的线性关系良好(R^2≥0.9818),加标回收率在87.5%~109%之间,平均相对标准偏差(RSD)在1.1%~4.7%之间,方法的检出限(LOD)和定量限(LOQ)分别为0.0004~0.007mg/g和0.001~0.02mg/g。该方法适用于烟草7种高级脂肪酸的快速测定,具有简单、快速、灵敏等特点。
简介:摘要:随着近几年来我国社会各方面的建设发展,科学水平的高速发展正在逐渐开始促进现如今我国社会各行各业的创新进步与发展,并且现代人民群众的生活水平与质量日益提升,对于生活中所面临的诸多方面要求也逐渐开始有所提高,比如人们的衣食住行等问题,在现代经济富足的环境影响下,人们更加重视起食品的安全性来,并且现代食品中经常会发现较多的有害化合物与添加剂,对现代人民群众的健康造成了严重的威胁。基于此,将LC-MS/MS技术应用于食品质量与安全研究中,对现代我国社会食品安全方面的问题做出保障。
简介:Varian500-MSLC离子阱液相色谱/质谱所采用的SelecTemp技术的特征是,大气压电离源(API)电子掌控能力的特点,该技术能够在一个完整的分析流程中,通过控制温度分布,为梯度液相分离过程制造最优化的干燥气体。SelecTemp使得方法的设置及开发更加容易,并且可以自动记录数据文件中的所有参数。增强电容技术(ECC)则增加了可以被同时分析的离子数,能够提高灵敏度并降低背景干扰。这些特征有利于对热不稳定化合物的分析,包括制药产品和药物代谢物。全套500-MS包括MS工作站软件、HPLC设备、以及综合的串联HPLC柱。
简介:AbstractBackground:The human brain is the most complex organ in the body, and it is important to have a better understanding of how the protein composition in the brain regions contributes to the pathogenesis of associated neurological disorders.Methods:In this study, a comparative analysis of the frontal and temporal cortex proteomes was conducted by isobaric tags of relative and absolute quantification (iTRAQ) labeling and two-dimensional liquid chromatography-tandem mass spectrometry (2D LC-MS/MS). Brain protein was taken from relatively normal tissue that could not be avoided of damage during emergent surgery of the TBI (traumatic brain injury) patients admitted in Beijing Tiantan Hospital from 2014 to 2017. Eight cases were included. Four frontal lobes and 4 temporal lobes proteome were analyzed and the proteins were quantitated. Gene Ontology (GO), Ingenuity Pathway Analysis (IPA), and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis were used to analyze the biological function of identified proteins, unchanged proteins, and differentially expressed proteins (DEPs).Results:A total number of 2127 protein groups were identified in the frontal and temporal lobe proteomes. A total of 1709 proteins could be quantitated in both the frontal and temporal cortex. Among 90 DEPs, 14 proteins were screened highly expressed in the temporal cortex, including MAPT, SNCG, ATP5IF1, GAP43, HSPE1, STMN1, NDUFS6, LDHB, SNCB, NDUFA7, MRPS36, EPDR1, CISD1, and RALA. In addition, compared to proteins expressed in the frontal cortex, 14 proteins including EDC4, NIT2, VWF, ASTN1, TGM2, SSB, CLU, HBA1, STOM, CRP, LRG1, SAA2, S100A4, and VTN were a low expression in the temporal cortex. The biological process enrichment showed that unchanged proteins between the frontal and temporal cortex mainly take part in regulated exocytosis, axon guidance, and vesicle-mediated transport. The KEGG pathway analysis showed that unchanged proteins between the frontal and temporal cortex mainly take part in oxidative phosphorylation, carbon metabolism, Huntington's disease, and Parkinson's disease.Conclusions:The majority of proteins are unchanged between the frontal and temporal cortex, and unchanged proteins are closely related to its function. Among DEPs, MATP (tau) is upregulated in the temporal cortex, closely related to Alzheimer's disease (AD), and is one of the targets for the treatment of AD. CLU is downregulated in the temporal cortex which functions as an extracellular chaperone that prevents aggregation of non-native proteins. It was suggested that the temporal lobe may not be the "functional dumb area" of the traditional view, but could be involved in important neural metabolic circuits.
简介:目的建立同时测定比格犬血浆中非洛地平和美托洛尔的LC-MS/MS法。方法分析柱为AccucoreaQ色谱柱(50mm×2.1mm,2.6μm)。质谱采用电喷雾离子源(ESI),采用多反应监测(MRM),检测离子为正离子,分别选择m/z384/338.1、268/74.2和436.2/207.1作为非洛地平、美托洛尔和内标(缬沙坦)的检测离子对。结果非洛地平、美托洛尔的线性范围分别为0.2~100、2~800ng·ml-1,相关系数分别为0.9977和0.9959,批内精密度分别在1.2%~2.4%和0.7%~0.8%,基质效应分别在100.4%~103.9%和98.2%~100.9%,回收率分别在97.6%~98.5%和92.0%~101.7%。结论本法操作简单、方法准确可靠、检测灵敏度高,可以用于复方非洛地平美托洛尔缓释片比格犬体内的药代动力学研究。
简介:摘要目的探讨用液相色谱质谱技术(LC/MS/MS)检测肾上腺皮质类固醇激素的方法。方法采用多反应监测(MRM)分析模式检测干血斑标本(DBS)中17-OHP、雄烯二酮(androstenedione,4-A)和皮质醇(cortisol)等类固醇激素谱,进行定量分析。观察样品定量检测限(LOQ)、变异系数和回收率等指标,分析该检验方法的灵敏度和特异性。结果使用WatersUPLCI-ClassXevoTQ-D系统结合HSST3色谱柱建立了干血斑DBS中5种激素同时测定的分析方法,皮质醇、21-脱氧皮质醇、11-脱氧皮质醇、雄烯二酮和17-羟孕酮等5种激素在XevoTQ-D系统在标准曲线范围内呈线性,线性拟合系数r2均>0.99。最低定量限在5~10ng/ml之间。信噪比大于三倍最低定量限。具有较好的灵敏度,线性关系和重现性结果。结论串联质谱技术可应用于皮质类固醇激素检测,灵敏度和特异性较高,有开展二线筛查的可行性。
简介:摘要:目的:建立一种毛发中Δ9-四氢大麻酚的的液相色谱-串联质谱(LC-MS/MS)的检测方法。方法:洗涤后的毛发通过1mL4%的氢氧化钠溶液水解,在PH3~4条件下,用2mL氯仿:异丙醇(9:1)提取两次,合并两次提取液,于60℃空气流下吹干。残留物用100μL甲醇溶解,采用LC-MS/MS多反应监测模式对Δ9-四氢大麻酚进行定性定量分析。结果:该方法对毛发中Δ9-四氢大麻酚的线性范围为0.05~5.0ng/mg(r=0.997),检出限和定量限皆为0.05ng/mg,日内精密度和日间精密度分别为4.53%~11.2%、4.23%~10.2%,准确度为90.5%~96.4%。结论:建立的碱消化-液-液提取LC-MS/MS检测方法操作简单,经济实用,成本较低,不需要借助其他特殊的装置就能完成,适用于毛发样品中Δ9-四氢大麻酚的定性定量检测分析。