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2010全国质谱大会大会报告(二)

2010.8.03

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美国北卡大学Chaple Hill医学院 Chen, Xian(陈先)教授

  来自美国北卡大学Chaple Hill医学院的 Chen, Xian(陈先)教授,做了题为“Systems Dissection of Signal Transduction by Using Quantitative Proteomics”(用定量蛋白质组方法系统剖析信号传导)的报告,在报告中,陈教授主要介绍了课题组利用同位素标记的方法,进行蛋白质组学定量研究的方法。

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芝加哥大学 Zhao, Yingming(赵英明)教授

  来自芝加哥大学的Zhao, Yingming(赵英明)教授做了题为“Discovery of Novel Biochemical Pathways Using Proteomics Approaches”(使用蛋白质组学方法发现新的生化路径”的报告。在报告中,赵教授谈到,很多对于组蛋白和p53的研究显示,这些蛋白可能会存在一系列的翻译后修饰,而这些修饰的大多数和重要的生物功能相关。然而除了对于已被广泛研究的几个蛋白,在其它蛋白中,翻译后修饰的类型和修饰的位点还有很多是未知的。对信息的缺乏暗示了一种对于可靠的表征蛋白中所有的翻译后修饰及动态变化的迫切需求。该课题组最近发展了一种非限制的蛋白序列校准算法,PTMap,并用它配合质谱一起用于所有可能的翻译后修饰的测定,不管是已知的还是以前从未发表过的。使用这种算法,课题组鉴定了新型的翻译后修饰,发现常见的体外蛋白修饰,研究了翻译后修饰的交叉污染和蛋白的突变。以下是英文摘要:

  Extensive studies in histones and p53 suggest that these proteins can be modified by an array of protein post-translational modifications(PTMs), most of which are correlated with important biological functions. Nevertheless, PTM types and their sites in other proteins remain largely unknown, except several widely studied ones. The information deficiency suggests an urgent need for reliable technology for characterization of all the PTMs in a protein and for their dynamic studies. To this end, we recently developed an unrestrictive protein sequence alignment algorithm, PTMap, and used it in conjunction with mass spectrometry for accurate identification of all the possible PTMs, known or undescribed ones. We have used the algorithm to identify novel PTMs, to discover common in vitro protein modifications, to study PTM cross-talks, and to study protein mutations. In this presentation, applications of such mass spectromety-based proteomics technologies will be discussed.

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台湾国立Chung Hsing大学 Maw-Rong Lee(李茂榮)教授

  来自台湾国立Chung Hsing大学的Maw-Rong Lee(李茂榮)教授,做了题为“Functionalized Nanoparticles Assisted Desorption Electrospray Ionization for Determination of Ultraviolet Absorbers in Urine”(用功能纳米粒子辅助解吸电喷雾技术测定尿中的紫外线吸收剂)的报告,该课题组用实验室自制的丝网印刷的银板或石墨板,进行高电压下的电喷雾,并介绍了课题组使用的紫外线吸收剂的提取过程。经过提取,用溶剂从磁性粒子NPs上提取出分析物。提取物或未解吸的磁性粒子NPs被滴在丝网上印刷,来评估离子化效率。实验结果显示,该纳米粒子可以提高信号强度缩短分析时间。说明功能纳米粒子辅助解吸电喷雾技术可在痕量分析中增强专一性并提高通量。以下是英文摘要:

  Functionalized nanoparticles assisted desorption electrospray ionization for analysis of ultraviolet absorbers in urine was developed. The electrospray was performed with high voltage on a laboratory-made screen-printed plate with silver or graphite. In this study, the ultraviolet absorbers including 3-(4-methylbenzylidene)-camphor (4-MBC),2-ethyl-4-(dimethylamino)-benzoate(O-PABA)AND 2-hydroxy-4-(octyloxy)-benzophenone(BP-12) were extracted with iron oxide-coated silicon dioxide nanoparticles as the affinity adsorbent. After extraction, the analytes were isolated from magnetic NPs with solvent. The extract or the magnetic NPs without desorption was dipped on the screen-printed to evaluate the effect on the ionization efficiency. From the results, the nanoparticles can enhance the intensity of the signal detected and short the analytical time. This technique demonstrates that the nanoparticles assisted desorption electrospray ionization offers a high specific and high throughput screening for trace analysis.

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台湾新竹国立清华大学 Yong-Chien Ling (凌永健)教授

  来自台湾新竹国立清华大学的Yong-Chien Ling (凌永健)教授,做了题为“GC-MS雜質剖析及GC-IRMS同位素指紋應用於追蹤甲基安非他命來源”的报告。报告摘要如下:

  甲基安非他命多你来一直为台湾地区缉获的最大宗毒品,为毒品滥用日渐严重之主因,如何由查缉之甲基维他命毒品,透过化学分析,判定相关的合成原料及途径,以供参考追溯毒品来源及管道,作为更近一步防制的基础,已成为认识科学上不可或缺的关键技术。台湾地区目前分析甲基安非他命的方法主要利用GC/MS杂质剖析,分析合成过程所产生的杂质,以区分不同合成途径之甲基安非他命,随着毒枭的制毒工艺持续精进,产生杂质愈来愈少,GC/MS杂质的剖析的功能,成效有限。利用同位素比质谱仪(IRMS)获得甲基安非他命的δ13C、δ15N值的特异性,逐渐成为来源追踪的新兴工具。

   本研究与国际接轨使用CHAMP进行GC/MS杂质剖析,搭配GC(气相层析)-IRMS、EA(素分析)-IRMS分析,追踪甲基安非他命毒品来源。本研究首先利用Nagai、Moscow、Reductive amination等制备扣之甲基安非他命毒品。以CHAMP GC/MS 杂质剖析以及IRMS分析所有样品。根据欧氏距离及δ13C、δ15N值结果可以区分批次、方法、前驱物不同之样品,整合横、纵面了解。用统计方法确认样品间相关性,建立药物来源之相关性。可以区分合法药品与毒品来源,供后续建立毒品资料库之依据。

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