High resolution mass spectrometry

In ebook "Applications of MALDI-TOF spectroscopy" some topics involve the principles and the applications of ISD. Typically, MALDI is coupled with time-of-flight (TOF) analyzers with rather high resolution and a good cost performance, therefore MALDI-TOF-MS has become a nice combination in MS analysis.

220p coduathanh1122 27-03-2024 2 1   Download

This study aimed to develop a method for measuring eight alkenylbenzenes (eugenol, methyl eugenol, acetyl eugenol, trans-isoeugenol, safrole, estragole, myristicin and trans-anethole) in various spices using gas chromatography highresolution mass spectrometry (GC-HRMS) with a simple ultrasonic vibration sample extraction method.

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Ebook "Advancements of mass spectrometry in biomedical research" explores the use of mass spectrometry for biomedical applications. Chapters focus on specific therapeutic areas such as oncology, infectious disease, and psychiatry. Additional chapters focus on methodology, technologies and instrumentation, as well as on analysis of protein-protein interactions, protein quantitation, and protein post-translational modifications. Various omics fields such as proteomics, metabolomics, glycomics, lipidomics, and adductomics are also covered.

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Part 1 book "Chemical analysis of non antimicrobial veterinary drug residues in food" includes content: Basic considerations for the analyst for veterinary drug residue analysis in animal tissues, emerging techniques in sample extraction and rapid analysis, capabilities and limitations of high resolution mass spectrometry (HRMS) - time of flight and orbitrap... and other contents.

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In the last decade, the consumption trend of organic food has increased dramatically worldwide. However, the lack of reliable chemical markers to discriminate between organic and conventional products makes this market susceptible to food fraud in products labeled as “organic”.

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A method for the trace analysis of polar micropollutants (MPs) by direct injection of surface water and groundwater was validated with ultrahigh-performance liquid chromatography using a core-shell biphenyl stationary phase coupled to time-of-flight high-resolution mass spectrometry.

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Polyetherpolyols are oftenusedinformulatedsystems,buttheir complete characterizationis challenging, because of simultaneous heterogeneities in chemical composition, molecular weight and functionality. One-dimensional liquid chromatography–mass spectrometry is commonly used to characterize polyether polyols.

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Mandatory disclosure of the species identity, production method, and geographical origin are embedded in the regulations and traceability systems, governing international seafood trade. A high-resolution mass spectrometry-based metabolomics approach could simultaneously authenticate the species identity and geographical origin of commercially important shrimps.

10p viginny 23-12-2022 11 3   Download

We developed a new multiplexed reversed phase liquid chromatography-high resolution tandem mass spectrometric (LC-MS/MS) method. The method is based on isobaric labeling with a tandem mass tag (TMT10-plex) and stable isotope-labeled internal standards, and was used to analyze amino acids in mouse brain microdialysis samples.

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Next generation human therapeutic monoclonal antibodies (t-mAbs) are harder to quantify with the widely used bottom-up tryptic digestion method. Due to their homology with endogenous immunoglobulins, there is a lack of unique and stable ‘signature’ peptides that can be targeted. Middle-up two dimensional liquid chromatography high resolution mass spectrometry (2D-LC-HRMS), targeting the entire light chain, was examined as an alternative.

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Structural elucidation of compounds detected with liquid chromatography coupled to high resolution mass spectrometry is a challenging and time-consuming step in the workflow of non-targeted analysis and often requires manual validation of the results. Retention time, alongside exact mass, isotope pattern, fragmentation spectra, and collision cross-section, is valuable information for ruling out unlikely structures and increasing the confidence in others.

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For high throughput native mass spectrometry (MS) protein characterization, it is advantageous to desalt and separate proteins by size exclusion chromatography (SEC). Sensitivity, resolution, and speed in these methods remain limited by standard SEC columns.

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The present study evaluates the presence, persistence and distribution of thymol during a five-month sampling period; before, during and after the application of thymol treatment in field conditions. Moreover, its impact on the development of bee brood was also studied at different development stages which consist of larvae, prepupae, pupae and adult honeybee.

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In this report, by a high performance liquid chromatography (HPLC) - high resolution mass spectrometry (HRMS) method, 7 molecular species of phospholipid in the polar lipid class were identified including phosphatidylinositol (PI) and phosphatidylglycerol (PG). The PI 32:0 (16:0/16:0) and PG 34:3 (16:1/18:2) molecular species have the highest content.

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New derivatives of 2(3),9(10),16(17),23(24)-tetrakis-(6-methylpyridin-2-yloxy)phthalocyanine (Pc) (2b, 2c, and 2d) were synthesized and their structures were characterized by elemental analysis, IR, 1 H NMR, and high-resolution mass spectrometry. The spectral results were in line with the proposed structures. The photodegradation of Orange G (OG) dye in DMSO by the Pc derivatives was investigated. The compounds showed relatively high photodegradation rates that increased with increasing size of the central atoms.

11p tudichquannguyet 29-11-2021 17 1   Download

: The study aims to determine the secondary metabolites of Hypericum androsaemum L. extracts by liquid chromatographyhigh resolution mass spectrometry (LC-HRMS), and investigate the antioxidant and cytotoxic activities of the plant. Cytotoxic activity was evaluated by MTT assay, and apoptosis induction abilities on human prostate adenocarcinoma (PC-3), and hepatocellular carcinoma (Hep G2) cell lines. Accordingly, major secondary metabolites were found as hederagenin (762 ± 70.10 μg/g) in the leaves dichloromethane (LD), herniarin (167 ± 1.

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In this study, authors investigated analytical procedure for the determination of 17 toxic PCDD and PCDF congeners in human serum using HRGC-HRMS according to US EPA method 1613B with necessary modifications suitable for practical facilities in our laboratory in Vietnam-Russia Tropical Center (VRTC).

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Interpreting non-targeted metabolomics data remains a challenging task. Signals from non-targeted metabolomics studies stem from a combination of biological causes, complex interactions between them and experimental bias/noise.

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Advances in high-resolution mass spectrometry facilitate the identification of hundreds of metabolites, thousands of proteins and their post-translational modifications. This remarkable progress poses a challenge to data analysis and visualization, requiring methods to reduce dimensionality and represent the data in a compact way.

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Lipidomics, the comprehensive measurement of lipids within a biological system or substrate, is an emerging field with significant potential for improving clinical diagnosis and our understanding of health and disease.

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