兴奋剂药物的液质联用检测方法

本文以激素类药物和利尿剂为例介绍了兴奋剂检测中液质联机用于利尿药物、糖皮质激素和一些气质联机难以完成的药物检测工作.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

蛋白质组学在HIV中的研究进展

阐明AIDS的分子病理学机制,提出新的疾病预防措施是当前的研究热点.本文综述了当前普遍使用的蛋白质组学技术在HIV研究领域的应用,为人们对HIV进行更深入的研究提供了理论依据.     

Mass spectrometry-based proteomics: principles, perspectives, and challenges

Mass spectrometry-based proteomics is a modern and rapidly developing methodology for qualitative and quantitative characterization of proteins and their posttranslational modification, subcellular localization, and interaction partners. It enables characterization of entire proteomes with unprecedented sensitivity and precision, providing platforms for identification of biomarkers and drug targets.     

Determination of benzimidazole residues using liquid chromatography and tandem mass spectrometry.

The determination of residues of benzimidazole using liquid chromatography and tandem mass spectrometry (LC-MS-MS) with ion spray ionization is described. Swine muscle tissue was spiked with a mixture of fifteen benzimidazoles, including metabolites of fenbendazole and albendazole. As clean-up procedure, an ethyl acetate extraction followed by solid-phase extraction on styrol-divinyl-benzene cartridge was used. The evaluation was performed by selecting the characteristic product ions for the benzimidazoles and using multiple reaction mode. 2-n-Butylmercaptobenzimidazole was used as internal standard. Blank muscle samples were fortified in the concentration range of 1-22 microg/kg. The limits of detection were below 6 microg/kg and the limits of quantification for most benzimidazoles were below 10 microg/kg. The matrix effect was checked using spiked muscle tissues of cattle and sheep as well as liver of cattle. Practical application will be shown by incurred egg material from laying hens treated with flubendazole. The recovery of the clean-up was mostly above 50% in muscle tissue and 70% in egg yolk.     

结构域蛋白质组学研究进展

蛋白质的结构域是蛋白质中具有特异结构和独立功能的区域。与蛋白质本身的数量相比，结构域的数量是有限，每个结构域所包含的成员数目也是有限的。在蛋白质组学研究的现阶段，研究方法上的限制尚无法全面实时地研究哺乳动物细胞的整个蛋白质组。由于结构域在功能上的重要性和其数量的有限性决定了以结构域为研究对象在蛋白质组学规模上进行研究不失为现阶段蛋白质组学研究的一种现实的选择。本文综述一些在这些方面所做出的早期的尝试。研究人员分别以SH3、PDZ和WW等结构域为对象进行蛋白质组学规模上的研究，并建立和完善了一些研究方法。总之，在结构域基础上研究蛋白质组是研究蛋白质组学的一个独特的视角。     

质谱技术在蛋白质组学中的应用

质谱技术是通过测定样品离子的不同质荷比（m/z）及其分布来进行结构和成分分析的一种分析方法.自从20世纪中期商品化的离子仪出现以后,由于其电离技术和分析技术的不断发展与完善,质谱在环境化学、有机化学、地质化学及制药等多个领域都有着较为广泛的应用.     

精子蛋白质组学研究进展

迄今蛋白质组学技术已被广泛应用于生理与病理状态下差异蛋白表达的研究,在人类精子蛋白质组学研究方面,许多研究应用该技术对生理与病理状态下精子差异蛋白表达进行了探索,从蛋白质组水平揭示了精子不同生理与病理条件下的蛋白质表达谱的变化规律,为全面理解精子生理与病理的分子机制提供了可靠的理论依据.     

Allelic loss analysis by denaturing high-performance liquid chromatography and electrospray ionization mass spectrometry

Analysis of allelic imbalance is of great importance for understanding tumorigenesis and the clinical management of malignant disease. Fluorescent-based capillary electrophoresis (CE) of highly polymorphic short tandem repeats (STRs) has become the main method used to detect the loss/gain of alleles. However, there is continued interest in the development of techniques that require no fluorescence and allow the rapid analysis of individual samples. One promising alternative is ion-pair reversed-phase high-performance liquid chromatography (IP-RP-HPLC), which is widely available because of its use in denaturing HPLC. Its applicability in combination with ultraviolet (UV) absorbance detection to the efficient separation of di- and tetranucleotide repeats on the short arm of chromosome 11 was tested using 25 matched pairs of normal and ovarian cancer tissues. Loss of heterozygosity (LOH) could be readily identified for all 13 loci tested, based on changes in the ratios between either the alleles or homo- and heteroduplex signals. However, discrimination between noninformative homo- or hemizygous and heterozygous samples was difficult or impossible when HPLC failed to resolve the alleles. Hyphenation of HPLC with electrospray ionization (ESI) quadrupole ion trap (IT) mass spectrometry (MS) not only allowed the identification of coeluting alleles, but also the reliable detection of a 40% reduction of one allele. The size range of DNA fragments amenable to mass spectrometric analysis was effectively tripled to >300 bp by the use of a linear IT and a Taq DNA polymerase cocktail lacking detergents that otherwise adversely affect ESI.     

Characterization of a recombinant monoclonal antibody by mass spectrometry combined with liquid chromatography

In this report, we present the characterization of a humanized monoclonal antibody specific for the human epidermal growth factor receptor (hEGFR). Direct analysis by matrix assisted laser desorption ionization mass spectrometry (MALDI-MS) of peptide mixtures and chromatographically isolated fractions allowed identification of 94.0% and 85.4% of the amino acid sequence of light and heavy chains, respectively. Microheterogeneity sources were identified in light and heavy chains and a previously unreported posttranslational modification for immunoglobulins was found. One N-glycosylation site was identified in the heavy chain with non-sialylated bianntenary fucosylated structures. This study is one of the first to assess the potential of MALDI-MS in combination with more conventional protein chemistry techniques for the characterization of monoclonal antibodies.     

Heart disease, clinical proteomics and mass spectrometry

Heart disease is the leading cause of mortality and morbidity in the world. As such, biomarkers are needed for the diagnosis, prognosis, therapeutic monitoring and risk stratification of acute injury (acute myocardial infarction (AMI)) and chronic disease (heart failure). The procedure for biomarker development involves the discovery, validation, and translation into clinical practice of a panel of candidate proteins to monitor risk of heart disease. Two types of biomarkers are possible; heart-specific and cardiovascular pulmonary system monitoring markers. Here we review the use of MS in the process of cardiac biomarker discovery and validation by proteomic analysis of cardiac myocytes/tissue or serum/plasma. An example of the use of MS in biomarker discovery is given in which the albumin binding protein sub-proteome was examined using MALDI-TOF MS/MS. Additionally, an example of MS in protein validation is given using affinity surface enhanced laser desorption ionization (SELDI) to monitor the disease-induced post-translational modification and the ternary status of myocyte-originating protein, cardiac troponin I in serum.     

Analysis of tetracyclines in raw urine by column-switching high-performance liquid chromatography and tandem mass spectrometry

The aim of the project was to develop a fast and reliable method for the quantification of the three tetracyclines: tetracycline, oxytetracycline and chlortetracycline in urine. The method is based on column-switching high-performance liquid chromatography with detection by MS-MS. Buffer is added to the sample before it is injected into the chromatographic system, and the first column which is an internal surface reversed-phase column separates the tetracyclines from the bulk of other compounds in urine. The tetracyclines are collected and concentrated on the analytical column before they are separated and eluted into the mass spectrometer in which the tetracycline are detected. The mass spectrometer is a triple quadrupole instrument and is equipped with an electrospray ion source. The MH+ ions are selected in the first quadrupole and collisionally activated in the collision cell. Upon collision, activation all three tetracyclines form fragment ions which could be assigned as: [M+H-H2O-NH3]+ which are selected in the sond mass filter. The detection limits for all three tetracyclines are about 10 ppb, and the calibration curves are linear from 10 to 1000 ppb.