简介:摘要:目的 建立UPLC-MS/MS法同时测定大败毒胶囊中的芍药苷、绿原酸、橙皮苷3个成分的含有量。方法 Agilent poroshell 120 EC-C18(2.1mm×50mm,1.9μm)色谱柱,流动相A为乙腈,流动相B为0.02%甲酸水溶液,梯度洗脱,柱温为35℃,流速为0.2ml/min,进样量为5μl;电喷雾(ESI)离子源。结果 各组分在线性范围内线性关系良好,平均加样回收率98.1%-102.1%,RSD1.83%-4.42%。结论 该方法结果准确可靠,效率高,可为大败毒胶囊的质量控制研究提供科学依据。
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:摘要: 目的 采用UHPLC-MS/MS法测定中成药中西地那非、伐地那非、他达那非。方法 采用Agilent C18 (1.8μm,2.1×50mm) 色谱柱;流速:0.2mL/min ;流动相: A为含0.1%乙酸的0.02mol/L乙酸铵溶液,B相为甲醇,梯度洗脱;柱温35℃。结果 三种物质在所建立的色谱条件下均能较好分离, 在 20ng/mL~200ng/mL浓度范围内线性关系良好,相关系数均大于0.995,平均回收率97.3%~102.0%。结论 该方法前处理简单、选择性强,灵敏度高,可用于测定中成药中3种非法添加的壮阳类化学药物。
简介:摘要:目的 探讨广西玉林地区高龄孕妇羊水细胞检查胎儿染色体核型异常情况。方法对广西玉林地区1001例高龄孕妇羊水细胞检查胎儿染色体核型结果进行统计分析。结果 2019年1月至2019年12月广西玉林地区高龄孕妇1001例行羊膜腔穿刺术,羊水细胞检查出胎儿染色体核型异常63例,异常率为 6.29%,其中数目异常26例,占异常核型41.27%;结构异常22例,占异常核型34.92%;嵌合体9例,占异常核型14.29%;染色体多态6例,占异常核型9.52%;且随年龄增长胎儿染色体异常比率增加,按孕妇年龄35-39岁、≥40岁组胎儿染色体异常率比较,随着孕妇年龄增长胎儿染色体异常率上升。结论 高龄孕妇导致胎儿染色体非整倍体机率增加,并且随着孕妇年龄的增长胎儿染色体异常率逐渐增高,对高龄孕妇进行优生遗传咨询,行细胞检查胎儿染色体核型是减少染色体异常儿出生的有效手段,从而提高我国出生人口素质。
简介:摘要:建立了一种全新的以QuEChERS法为样品前处理技术结合UPLC-TQS法快速测定动物源性食品多种兽药残留的方法。样品经甲醇-乙腈混合溶液提取并通过DISQUETM净化管净化,上清液经正己烷除去脂肪、样品浓缩后用色谱柱进行分离,以甲醇5mmol/L醋酸铵含0.1%甲酸水溶液为流动相进行梯度洗脱,多反应监测(MRM)模式检测,外标法定量。结果表明:目标物在1~50μg/kg的空白添加浓度范围内均有良好线性关系,相关系数r≥0.99;样品中多种药物的检出限(LOD)均为0.5μg/kg,定量限(LQD)均为1.0μg/kg;在5~20μg/kg的添加水平范围内平均回收率为75.8%~93.2%,(RSD)为3.1%~13.2%。该方法具备快速、简便、准确性高、用性强等特点,适合动物源性食品中多类药物残留的定性定量检测。
简介:摘要:本文建立了一种利用液相色谱-串联质谱法LC-Ms/Ms测定蜂产品中氯霉素残留量的方法。样本提取、净化后,经乙腈-水流动相体系洗脱,C18色谱柱分析后,利用三重四级杆液相色谱质谱联用仪灵敏度高、专属性强、定量准确来检测氯霉素,可以用来快速筛查蜂蜜和蜂王浆中的氯霉素残留。
简介:摘要:本论文旨在建立运用电感耦合等离子体质谱技术同时检测水中25种元素含量的方法。除铍、硼两个待测元素运用No gas调谐模式,其余23种待测元素均运用He模式消除测定中的质谱干扰,同时应用在线添加内标液的形式校正非质谱干扰,提高测定方法的灵敏度和准确度。本实验所测25种待测元素质量浓度线性关系较好,标准曲线相关系数R在0.9994~1.0000。本方法建立的水中25种待测元素的检出限为0.00127~7.58μg/L,相对标准偏差RSD%在0.2%~4.6%,三个不同加标浓度水平下测试的水样平均加标回收率为87.5%~129%。本实验所建方法具有线性范围宽,较高的灵敏度、精密度和准确度,满足水中25种元素痕量检测和定量分析的要求。
简介:摘要 目的:对延边州地区10批朝鲜当归中重金属元素铅(Pb)、镉(Cd)、砷(As)、汞(Hg)、铜(Cu)进行测定。方法:样品制备采用微波消解法,测定采用电感耦合等离子体质谱(ICP-MS)法。结果:铅、砷在0~20ng/ml,镉在0~10ng/ml,铜0~500ng/ml,汞0~5ng/ml范围内与各自CPS比值呈良好的线性关系,铅、砷、镉、铜、汞的回归方程分别为y=0.0093X-0.0012,y=0.0051X+0.003895,y=0.0061X+0.006473,y=0.1276X-0.00363,y=0.0024X+0.0045733,r均为0.9999,精密度、稳定性、重复性试验结果的RSD均<5%,平均回收率分别为
简介:摘要:多环芳烃 Polycyclic Aromatic Hydrocarbons;PAHs
简介:摘要:通过徕卡高端设备的技术发展,对于无法直接量取的三维空间尺寸来说,需要逆向建模后才可查询到完整的空间尺寸关系,极大的提升了工作效率与数据的准确性,也丰富了数据资料的准确性、直观性与可视性。
简介:摘要:采用萃取与超高效液相色谱与电喷雾四极杆飞行时间串联质谱联用法(UPLC-QTOF-MS)对固化胶黏剂中的添加剂乙二胺四乙酸二钠(EDTA-2Na)及其钠盐进行分析。首先考察了萃取流程的优化,确认了先采用少量THF溶胀已经剪碎的样品,然后再用三氯化铁作水溶液萃取,EDTA-2Na可以被络合成EDTA-Fe而被萃取到水溶液中,可以获得较高的萃取效率。以三氯化铁作为络合剂,并应用了色谱柱Waters ACQUITY UPLC HSST3柱(2.1mm×100mm,1.8μm),流动相采用甲醇和水(10mM/L 醋酸铵)的梯度洗脱,柱温40℃,大气压喷雾电离源,负离子采集模式,离子源温度为120℃。结果表明形成的络合物乙二胺四乙酸铁(EDTA-Fe)峰有很好的信号,测定的乙二胺四乙酸二钠在5000μg/L 浓度范围内峰面积与浓度呈良好线性关系(r = 0.9998)。本法提供了固化胶中EDTA的提取检测方法,采用三氯化铁络合的方法萃取以及后续UPLC-XTOF-MS定性和定量检测,优化得到的萃取流程和色谱质谱条件可以拓展应用于其他固体基质中EDTA-2NA的定性与定量检测。