impact II VIP

This application note describes the application of bbCID data acquisition for pesticide target screening by coupling a GC to an atmospheric pressure chemical ionization source (GC-APCI) and a high resolution QTOF-MS. Pesticides are frequently found as contaminations in food and environmental matrices, and commonly analyzed by GC-MS or LC-MS.

This application note presents a study evaluating the suitability of high resolution, accurate mass Quadrupole Time of Flight (QTOF) technology as an additional approach for the simultaneous detection, confirmation and quantification of benzodiazepine and non-benzodiazepine hypnotics in human serum. Traditionally liquid chromatography - tandem mass spectrometry (LC-MS/MS) systems using multiple reaction monitoring (MRM) have been used for this type of analysis.

This poster presents a method optimized QTOF MS system with self-adapting deep sequencing MS/MS capabilities (InstantExpertise™) that allows facile pharmaceutical product verification of synthetic peptides. Bioactive peptides are common, widely used supplement products in pharma, biopharma, as well as nutritional industries. The synthesis of bioactive peptides with accurate amino acid sequences is pivotal to ensure correct biological activity; thus, methods that ensure accurate de novo verification as well as simultaneous impurity characterization are very important. This method combines high speed self-optimized MS/MS, accurate isotopic patterns, and high mass accuracy fragment data.

Persistent Organic Pollutants (POPs) are major concern for the environment, quantifying them with sensitivity and confidence increasingly important. The study in this application note uses an atmospheric pressure chemical ionization GC coupled to a high-resolution QTOF – MS to analyze the levels of key substances in POPs, including decaBDE which is the most difficult PBDE to analyze.

Over their life cycle, proteins undergo various transformations that can alter their functions while keeping a good part of their primary sequence intact. This multiplication of Post Translational Modifications (PTM) patterns, alternative splice forms or products of proteolytic processing cannot be easily resolved with a bottom-up approach, as very few peptides are specific from a given proteoform. However, the information relative to the distribution of different proteoforms can be seen in their intact mass profile. This application note explores the potential of the latest generation UHR-QTOF to quickly map the distribution and relative abundances of proteoforms in complex protein extracts.

In trapped ion mobility spectrometry (TIMS), ions are radially confined in a quadrupolar field and axially trapped by an electric field gradient (EFG) that counteracts the drag force exerted from a flow of gas. After ions reach a mobility-dependent equilibrium position inside the trap, the magnitude of the EFG is decreased such that ions elute over a user defined timescale (~10 ms to 1 s). Recently, an analytical model for TIMS was derived and, in part, experimentally verified. A central, but not yet fully explored component of the model involves the fluid dynamics at work in the analyzer (i.e.: gas velocity, pressure gradient, flow profile, etc.). This poster characterizes the fluid properties using computational fluid dynamics (CFD) simulations and ion mobility experiments.

A new gas chromatography atmospheric pressure chemical ionization (GC-APCI) source coupled to a high-resolution QTOF-MS was used for the GC/MS analysis of polycyclic aromatic hydrocarbons (PAH), pesticide and explosive standards as well as soil, sediment and sludge samples of environmental origin. Compared to an earlier GC-APCI design, the source demonstrated improved GC/MS performance in terms of reproducibility and analytical working range.

This case study describes the creation of a high-resolution, manually curated metabolite library of about 800 human metabolites established using a high performance quadrupole-time-of-flight mass (Q-TOF) spectrometer. This library formed the basis for the described workflow for rapid and accurate metabolite identification in untargeted metabolomics research, exemplified on plasma, urine and saliva samples.

This poster demonstrates an investigation in to early stress responses and adaptation mechanisms in Solanum tuberosum to nitrogen limitation using combined ,omics’ approaches.

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