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Health and Safety Concerns of Hydrogen Use with Gas Chromatography 气相色谱法使用氢气的健康和安全问题
4区 化学 Q4 Chemistry Pub Date : 2023-10-01 DOI: 10.56530/lcgc.na.ub5690a5
Tony Taylor
The author discusses the benefits and challenges of using hydrogen in the laboratory, specifically regarding gas chromatography and GC–MS procedures.
作者讨论了在实验室中使用氢的好处和挑战,特别是关于气相色谱和GC-MS程序。
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引用次数: 0
Good Laboratory Practice (GLP): An Overview for the Analytical Chemist 良好实验室规范(GLP):分析化学家概述
4区 化学 Q4 Chemistry Pub Date : 2023-10-01 DOI: 10.56530/lcgc.na.un1878g5
Leon Doneski, David Roos, Michael Dong
Good Laboratory Practice (GLP) is a regulatory requirement to help ensure the quality, reliability, and integrity of pharmacological and toxicological studies during drug development. This article overviews GLP regulations and related public standards, focusing on practices relevant to analytical and bioanalytical chemists.
良好实验室规范(GLP)是一项监管要求,旨在帮助确保药物开发过程中药理学和毒理学研究的质量、可靠性和完整性。本文概述了GLP法规和相关公共标准,重点介绍了与分析和生物分析化学家相关的实践。
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引用次数: 1
The Evolution of LC Troubleshooting: Degassing LC故障诊断的演变:脱气
4区 化学 Q4 Chemistry Pub Date : 2023-10-01 DOI: 10.56530/lcgc.na.cy7988u5
Dwight R. Stoll
As chromatography technologies change, our approaches to using them in ways that value reliability, as well as the ways we should approach troubleshooting and fixing problems, should also change. In this installment, I continue the discussion started last month about how some specific troubleshooting topics have evolved over time, this time focusing on mobile phase degassing. Understanding how approaches to degassing have evolved is helpful for troubleshooting problems with pumps and detection, designing reliability into new methods, and when considering updates to legacy methods that have been in use for decades.
随着色谱技术的变化,我们以重视可靠性的方式使用它们的方法,以及我们应该处理故障和解决问题的方法,也应该改变。在本文中,我将继续上个月开始的讨论,讨论一些特定的故障排除主题是如何随着时间的推移而演变的,这一次将重点放在移动相脱气上。了解脱气方法的发展过程有助于排除泵和检测问题,设计新方法的可靠性,以及考虑更新已经使用了几十年的传统方法。
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引用次数: 0
Trends in Sample Preparation, Part I: Current State of the Field 样品制备的趋势,第一部分:该领域的现状
4区 化学 Q4 Chemistry Pub Date : 2023-10-01 DOI: 10.56530/lcgc.na.tu5672b5
Douglas E. Raynie
This installment of “Sample Prep Perspectives” reports the results obtained from a new survey on sample preparation techniques. This is our first survey since 2016 and its findings are compared with the results of previous surveys dating from 1991. Results involve undercover trends in the field over the last generation and their impact. The survey investigated trends in areas such as which technologies are currently being used, sample loads, sample sizes, automation, the use of solid-phase extraction (SPE) devices (cartridges, disks, plates, tips), SPE chemistries, selection criteria, and problems encountered. Respondents were also asked about sample preparation technologies on the horizon.
这一期的“样品制备观点”报告了从一项新的样品制备技术调查中获得的结果。这是我们自2016年以来的首次调查,其结果与1991年以来的前几次调查结果进行了比较。结果包括过去一代人在该领域的卧底趋势及其影响。该调查调查了目前正在使用的技术、样品负载、样品大小、自动化、固相萃取(SPE)设备(盒、磁盘、板、尖端)的使用、SPE化学、选择标准和遇到的问题等领域的趋势。受访者还被问及即将出现的样品制备技术。
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引用次数: 0
Overcoming Complex Analytical Challenges Posed by Targeted Multispecific Antibody Cancer Therapeutics 克服靶向多特异性抗体癌症治疗带来的复杂分析挑战
4区 化学 Q4 Chemistry Pub Date : 2023-10-01 DOI: 10.56530/lcgc.na.fz8280l1
Mark Lies
Complex multispecific antibodies overcome the limitations of standard monoclonal antibodies (mAbs), and have complex three-dimensional structures, greater heterogeneity, and often novel disulfide linkages and unusual post-translational modifications. As a result, the comprehensive characterization essential to the development of cost-effective manufacturing processes and safe and efficacious cancer treatments is much more challenging using traditional analytical instruments and techniques. Fortunately, there are new solutions available that provide fast results, often with greater sensitivity and resolution, even for these novel, complex molecules. The application of various new methods and instruments for the analysis of multispecifics is discussed as a means of highlighting their ability to facilitate the development of these important new modalities.
复杂的多特异性抗体克服了标准单克隆抗体(mab)的局限性,具有复杂的三维结构,更大的异质性,通常具有新颖的二硫键和不寻常的翻译后修饰。因此,综合表征对于开发具有成本效益的制造工艺和安全有效的癌症治疗至关重要,使用传统的分析仪器和技术更具挑战性。幸运的是,有新的解决方案可以提供快速的结果,通常具有更高的灵敏度和分辨率,甚至对于这些新的,复杂的分子也是如此。讨论了各种新方法和工具在分析多特性方面的应用,作为强调它们促进这些重要新模式发展的能力的手段。
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引用次数: 0
Are You Ready to Switch to Comprehensive Two-Dimensional Gas Chromatography? 你准备好切换到全面的二维气相色谱法了吗?
4区 化学 Q4 Chemistry Pub Date : 2023-09-01 DOI: 10.56530/lcgc.na.zy5775b7
Nicholas H. Snow
In the past two decades, comprehensive two-dimensional gas chromatography (GC×GC) has progressed from an interesting concept to the forefront of thinking and research in gas chromatography. Especially when combined with mass spectrometry detection, GC×GC provides high resolution, high sensitivity, and massive chromatographic data sets, which is useful in diverse fields such as petroleum analysis, metabolomics, food, flavor, fragrance, and environmental analysis. In this installment, recent developments in GC×GC that make it more amenable for routine use are discussed. These include advances in instrumentation, especially modulation, column sets, data analysis, and the range and types of samples amenable to GC×GC. We will ponder the question – are you ready to make the switch to GC×GC?
在过去的二十年里,综合二维气相色谱(GC×GC)已经从一个有趣的概念发展到气相色谱的思考和研究的前沿。特别是当与质谱检测相结合时,GC×GC提供高分辨率,高灵敏度和大量色谱数据集,可用于石油分析,代谢组学,食品,风味,香味和环境分析等不同领域。在本文中,将讨论GC×GC的最新发展,使其更适合日常使用。这些包括仪器的进步,特别是调制,柱组,数据分析,以及适用于GC×GC的样品范围和类型。我们会思考这个问题——你准备好切换到GC×GC了吗?
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引用次数: 0
A Multiphase Sampling and Analytical Approach for Investigating Airborne PFAS Transmission 研究机载PFAS传输的多相采样分析方法
4区 化学 Q4 Chemistry Pub Date : 2023-09-01 DOI: 10.56530/lcgc.na.vn3175v1
Steve Suh, David Kennedy, Reika Takahara, Manabu Takayanagi, Hiroshi Hayashida, Zhonghua Shen
The authors evaluated a sampling and analytical system to measure differing modes of atmospheric per- and polyfluorinated substances (PFAS) transmission. The sampling was conducted with the FM4 sampling module, which features particulate collection followed by polyurethane foam sorption followed by activated carbon disc adsorption, a configuration designed to capture PFAS-laden particulate matter (one-micron to ten-microns), as well as aerosol, volatile, and ionic PFAS species in a single sampling event. Individual sampling media fractions were subsequently analyzed by gas chromatography coupled with tandem quadrupole mass spectrometry (GC–MS/MS) and liquid chromatography coupled with tandem quadrupole mass spectrometry (LC–MS/MS) for 33 ionic and 20 neutral PFAS species. A multi-day field sampling event conducted in an outdoor urban environment demonstrated that the system was able to capture and differentiate a number of airborne PFAS species. The study showed that simultaneous, multi-phase sample collection coupled with GC–MS/MS and LC–MS/MS analysis can be a useful approach to further elucidate the mode and manner of atmospheric PFAS transmission.
作者评估了一个采样和分析系统,以测量大气中全氟和多氟物质(PFAS)传输的不同模式。采用FM4采样模块进行采样,该模块的特点是颗粒收集,然后是聚氨酯泡沫吸附,然后是活性炭盘吸附,该配置旨在捕获含有PFAS的颗粒物质(1微米至10微米),以及气溶胶、挥发性和离子型PFAS。随后,采用气相色谱-串联四极杆质谱(GC-MS /MS)和液相色谱-串联四极杆质谱(LC-MS /MS)对单个取样介质组分进行了33种离子PFAS和20种中性PFAS的分析。在室外城市环境中进行的为期数天的现场采样活动表明,该系统能够捕获和区分许多空气中的PFAS物种。研究表明,同时采集多相样品,结合GC-MS /MS和LC-MS /MS分析,可以进一步阐明大气中PFAS的传输模式和方式。
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引用次数: 0
Suspect Screening of Lupin-Produced Phytotoxins in Environmental Samples 环境样品中羽扇豆素产生的植物毒素的可疑筛选
4区 化学 Q4 Chemistry Pub Date : 2023-09-01 DOI: 10.56530/lcgc.na.hv2690i5
Xiaomeng Liang, Jan H. Christensen, Thomas D. Bucheli, Nikoline Juul Nielsen
Phytotoxins, secondary metabolites synthesized by plants, are now recognized as a new category of environmental micropollutants. Only a limited number of phytotoxins have been detected and reported in terrestrial and aquatic environments, partially due to analytical challenges. In this article, a robust, reliable, and efficient approach, namely Source Supported Suspect Screening (4S), is introduced for high-throughput analysis of phytotoxins from their plant origin to the downstream environmental compartments. The approach was established on an ultrahigh-performance liquid chromatography–electrospray ionization–quadrupole‑time‑of‑flight-mass spectrometry (UHPLC–ESI–QTOF-MS) analytical platform where optimal sample preparation and chromatographic conditions were investigated and a new suspect screening protocol was suggested.
植物毒素是植物合成的次生代谢产物,是目前公认的一类新的环境微污染物。在陆地和水生环境中仅发现和报告了数量有限的植物毒素,部分原因是分析方面的挑战。本文介绍了一种强大、可靠和高效的方法,即来源支持的可疑筛选(4S),用于从植物来源到下游环境区室的植物毒素的高通量分析。建立了超高效液相色谱-电喷雾电离-四极杆飞行时间质谱(UHPLC-ESI-QTOF-MS)分析平台,研究了最佳样品制备和色谱条件,并提出了新的可疑分子筛选方案。
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引用次数: 0
Functional Copolymers Analysis Using Liquid Chromatography (LC)—Sort It Out 功能共聚物的液相色谱分析-分选
4区 化学 Q4 Chemistry Pub Date : 2023-09-01 DOI: 10.56530/lcgc.na.ld1067s1
Ron A. H. Peters
The latest developments and challenges of using liquid chromatography (LC) for copolymer analysis are discussed.
讨论了用液相色谱法分析共聚物的最新进展和面临的挑战。
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引用次数: 0
Highlights from the 51st International Symposium on High Performance Liquid Phase Separations and Related Techniques (HPLC 2023) 第51届高效液相分离及相关技术国际研讨会(HPLC 2023)
4区 化学 Q4 Chemistry Pub Date : 2023-09-01 DOI: 10.56530/lcgc.na.hq8476g7
David S. Bell
The 51st International Symposium on High Performance Liquid Phase Separations and Related Techniques (HPLC 2023), chaired by Michael Lämmerhofer and Oliver Schmitz, was held from June 18 to 22 in Duesseldorf, Germany. This installment of “Column Watch” presents many of the highlighted topics and trends observed at this exceptionally well-run symposium.
由Michael Lämmerhofer和Oliver Schmitz主持的第51届高效液相分离及相关技术国际研讨会(HPLC 2023)于6月18日至22日在德国杜塞尔多夫举行。本期“专栏观察”将介绍在这次运行异常良好的研讨会上观察到的许多突出主题和趋势。
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引用次数: 0
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