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Developing an LC-MS/MS Assay for Screening Tracheal Aspirate Samples for Pepsin

Resolian
14 Oct 2018

A gastric reflux event (GRE) is defined as the passing of the gastroduodenal contents into the oesophagus and causing damage to the oesophagal mucosa. Monitoring GREs can aid clinical studies for drug development and inform treatment regimes in the clinic to minimise GRE occurrence, which can dramatically improve quality of life. This application note presents the development of a robust, semi-quantitative LC-MS/MS method to detect pepsin in tracheal aspirate using a Waters Acquity hyphenated to a Waters Xevo TQS.

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Clinical ChemistryBiochemistry (or clinical chemistry) involves the analysis of bodily fluids using chemical tests. Techniques used include HPLC, chromatography, spectroscopy, mass spectrometry, immunochemical, electrophoresis, turbidometric / spectrophotometric assay, MRI and ISE analysis. Tests are often carried out on plasma or serum but urine (urinalysis) and fecal specimens are also processed.Mass SpectrometryMass spectrometry (MS) is a powerful analytical technique used to identify and quantify molecules based on the mass-to-charge ratio of gas-phase ions. It provides detailed information about the structure, composition, and properties of compounds and is widely used across fields such as environmental monitoring, materials science, drug discovery and development, food and beverage testing, and wider chemical research. Key MS techniques include tandem mass spectrometry (MS/MS), liquid chromatography–mass spectrometry (LS-MS) and inductively coupled plasma (ICP-MS). Choosing from these wide range of techniques and technologies can be a daunting task, so keep up to date with scientific applications, performance expectations, and customer reviews here all in one place. Visit our product directory to receive quotes direct from the manufacturer. LC-MSLC-MS (liquid chromatography-mass spectrometry) systems and equipment are used for separation and quantitative analysis of complex mixtures, combining liquid chromatography and mass spectrometry. Quantify proteins, contaminants, pesticides or screen for drug metabolites with a high level of sensitivity. LC-MS systems and equipment include reverse phase, normal phase and specialized columns integrated with various MS detectors such as time-of-flight (TOF), quadrupole, orbitrap or ion trap mass analyzers. LC-MS/MS instruments equipped with a qTOF or triple quadrupole analyzer give greater sensitivity and resolving power to your analysis. Find the best LC-MS equipment in our peer-reviewed product directory: compare products, check customer reviews and receive pricing direct from manufacturers.ScreeningUsing robotics, data processing and control software, liquid handling devices and sensitive detectors, screening allows a researcher to quickly conduct millions of chemical, genetic or pharmacological tests.Compound ScreeningCompound screening is a method used to discover specific compounds that could be promising candidates for pharmaceutical use. This potential is identified when compounds interact with the target protein during screening and could therefore be carried forward in the drug development process.

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Developing an LC-MS/MS Assay for Screening Tracheal Aspirate Samples for Pepsin