Robert S. Plumb
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Adaptive Modeling of Tandem Mass Spectrometry Data: Creation of the METLIN 960K MRM Database Open
Multiple Reaction Monitoring (MRM) remains the gold standard for quantitative mass spectrometry but continues to be constrained by the limited availability of high-quality transitions and collision energy (CE) values for many biologically …
View article: Development and validation of a streamlined workflow for proteomic analysis of proteins and post-translational modifications from dried blood
Development and validation of a streamlined workflow for proteomic analysis of proteins and post-translational modifications from dried blood Open
It is increasingly recognized that the ‘omic analysis of whole blood has applications for precision medicine and disease phenotyping. Despite this realization, whole blood is generally viewed as a challenging analytical matrix in compariso…
View article: UHPLC-MS/MS analysis of PFAS in the serum of patients with Alzheimer's disease, mild cognitive impairment and controls: A preliminary study
UHPLC-MS/MS analysis of PFAS in the serum of patients with Alzheimer's disease, mild cognitive impairment and controls: A preliminary study Open
Complimentary UHPLC-MS methods for 6 ultra short chain (polar) and 30 long chain (and relatively non-polar) PFAS compounds have been developed and used to profile these compounds in human serum. The methods were developed to be rapid, with…
View article: An investigation of the plasma and urinary metabolite profiles of the hepatotoxin methapyrilene in the male Wistar rat
An investigation of the plasma and urinary metabolite profiles of the hepatotoxin methapyrilene in the male Wistar rat Open
The plasma and urinary metabolite profiles of the 2-thiophene-based H1-receptor antagonist methapyrilene (N,N-dimethyl-N'-pyridin-2-yl-N'-(thiophen-2-ylmethyl)ethane-1,2-diamine) were investigated in the rat following the oral administrati…
View article: A HILIC‐IM‐MS‐Based Pharmacometabodynamic Study of the Effects of Orally Administered Gefitinib on the Polar Urinary Metabolic Phenotypes of C57Bl6 Mice
A HILIC‐IM‐MS‐Based Pharmacometabodynamic Study of the Effects of Orally Administered Gefitinib on the Polar Urinary Metabolic Phenotypes of C57Bl6 Mice Open
The effects of the anilinoquinazoline tyrosine kinase inhibitor (TKI) gefitinib on the polar urinary metabolome of mice following oral administration (50 mg/kg) were studied over the 24 h period post dose. Analysis was performed using a hy…
View article: Mass spectrometry-based quantification of proteins and post-translational modifications in dried blood: longitudinal sampling of patients with sepsis in Tanzania
Mass spectrometry-based quantification of proteins and post-translational modifications in dried blood: longitudinal sampling of patients with sepsis in Tanzania Open
The proteomic analysis of blood is routine for disease phenotyping and biomarker development. Whole blood is commonly separated into soluble and cellular fractions. However, this can introduce pre-analytical variability; and analysis of a …
View article: Microbore-based vacuum jacketed liquid chromatography for fast, efficient and sustainable high throughput bioanalysis
Microbore-based vacuum jacketed liquid chromatography for fast, efficient and sustainable high throughput bioanalysis Open
Extra-column band broadening can significantly reduce the performance of rapid ultra-high performance liquid chromatography-MS-based methods (UHPLC-MS). However, as we show here, UHPLC-MS/MS methods on short 2.1 mm i.d. columns can be opti…
View article: Detection of pharmacolipidodynamic effects following the intravenous and oral administration of gefitinib to C57Bl/6JRj mice by rapid UHPLC-MS analysis of plasma
Detection of pharmacolipidodynamic effects following the intravenous and oral administration of gefitinib to C57Bl/6JRj mice by rapid UHPLC-MS analysis of plasma Open
Omics-based biomarker technologies, including metabolic profiling (metabolomics/metabonomics) and lipidomics, are making a significant impact on disease understanding, drug development, and translational research. A wide range of patho-phy…
View article: The rapid separation and characterization of sulfates of tyrosine and its metabolites in reaction mixtures and human urine using a cyclic ion mobility device and mass spectrometry
The rapid separation and characterization of sulfates of tyrosine and its metabolites in reaction mixtures and human urine using a cyclic ion mobility device and mass spectrometry Open
Ion mobility (IM) separations, especially when combined with mass spectrometry, offer the opportunity for the rapid analysis and characterization of mixtures. However, the limited resolution afforded by many IM systems means that in practi…
View article: Increasing coverage of the urinary polar metabolome using ultra high-performance hydrophobic interaction liquid chromatography combined with linear and cyclic travelling wave ion mobility and mass spectrometry
Increasing coverage of the urinary polar metabolome using ultra high-performance hydrophobic interaction liquid chromatography combined with linear and cyclic travelling wave ion mobility and mass spectrometry Open
The use of HILIC-based separations for the analysis of polar metabolites in metabolic phenotyping studies is well established. Here, we demonstrate the increased coverage of the polar metabolome obtained by travelling wave (TW) ion mobilit…
View article: Detection of Pharmacolipidodynamic Effects Following the Intravenous and Oral Administration of Gefitinib to C57Bl/6JRj Mice by Rapid UHPLC/MS Analysis of Plasma
Detection of Pharmacolipidodynamic Effects Following the Intravenous and Oral Administration of Gefitinib to C57Bl/6JRj Mice by Rapid UHPLC/MS Analysis of Plasma Open
Omics based biomarker technologies including metabolic profiling ( metabolomics /metabonomics) and lipidomics are making a significant impact on disease understanding, drug development, and translational research. A wide range of patho-phy…
Ensuring Fact-Based Metabolite Identification in Liquid Chromatography–Mass Spectrometry-Based Metabolomics Open
Metabolite identification represents a major bottleneck in contemporary metabolomics research and a step where critical errors may occur and pass unnoticed. This is especially the case for studies employing liquid chromatography-mass spect…
View article: A Novel Blood Proteomic Signature for Prostate Cancer
A Novel Blood Proteomic Signature for Prostate Cancer Open
Prostate cancer is the most common malignant tumour in men. Improved testing for diagnosis, risk prediction, and response to treatment would improve care. Here, we identified a proteomic signature of prostate cancer in peripheral blood usi…
View article: Investigation of the pharmacokinetics and metabolic fate of Fasiglifam (TAK-875) in male and female rats following oral and intravenous administration
Investigation of the pharmacokinetics and metabolic fate of Fasiglifam (TAK-875) in male and female rats following oral and intravenous administration Open
The metabolism and pharmacokinetics of fasiglifam (TAK-875, 2-[(3S)-6-[[3-[2,6-dimethyl-4-(3-methylsulfonylpropoxy)phenyl]phenyl]methoxy]-2,3-dihydro-1-benzofuran-3-yl]acetic acid), a selective free fatty acid receptor 1 (FFAR1)/GPR40 agon…
View article: High Throughput LC-MS Platform for Large Scale Screening of Bioactive Polar Lipids in Human Plasma and Serum
High Throughput LC-MS Platform for Large Scale Screening of Bioactive Polar Lipids in Human Plasma and Serum Open
Lipids play a key role in many biological processes, and their accurate measurement is critical to unraveling the biology of diseases and human health. A high throughput HILIC-based (LC-MS) method for the semiquantitative screening of over…
View article: Application of hybrid surface technology for improving sensitivity and peak shape of phosphorylated lipids such as phosphatidic acid and phosphatidylserine
Application of hybrid surface technology for improving sensitivity and peak shape of phosphorylated lipids such as phosphatidic acid and phosphatidylserine Open
The use of hybrid surface technology (HST), applied to the metal surfaces of an ACQUITY™ UPLC™ system and column, designed to mitigate the chelation, poor peak shape and analyte loss seen with acidic phospholipids was investigated. Compare…
View article: High Throughput UHPLC-MS-Based Lipidomics Using Vacuum Jacketed Columns
High Throughput UHPLC-MS-Based Lipidomics Using Vacuum Jacketed Columns Open
Reversed-phase UHPLC-MS is extensively employed for both the profiling of biological fluids and tissues to characterize lipid dysregulation in disease and toxicological studies. With conventional LC-MS systems the chromatographic performan…
High-Throughput UHPLC/MS/MS-Based Metabolic Profiling Using a Vacuum Jacketed Column Open
In UHPLC, frictional heating from the eluent flowing through the column at pressures of ca. 10-15 Kpsi causes radial diffusion via temperature differences between the center of the column and its walls. Longitudinal dispersion also occurs …
The Pharmacometabodynamics of Gefitinib after Intravenous Administration to Mice: A Preliminary UPLC–IM–MS Study Open
The effects of intravenous gefitinib (10 mg/kg), an anilinoquinazoline thymidylate kinase inhibitor (TKI), selective for the epidermal growth factor receptor (EGFR), on the urinary metabotypes of mice were studied. We hypothesized that, in…
Use of Cyclic Ion Mobility Spectrometry (cIM)-Mass Spectrometry to Study the Intramolecular Transacylation of Diclofenac Acyl Glucuronide Open
1-β-O-Acyl-glucuronides (AGs) are common metabolites of carboxylic acid-containing xenobiotics, including, e.g., many nonsteroidal anti-inflammatory drugs (NSAIDs). They are of concern to regulatory authorities because of the association o…
Rapid determination of the pharmacokinetics and metabolic fate of gefitinib in the mouse using a combination of UPLC/MS/MS, UPLC/QToF/MS, and ion mobility (IM)-enabled UPLC/QToF/MS Open
The metabolism and pharmacokinetics of gefitinib (Iressa®, N-(3-chloro-4-fluorophenyl)-7-methoxy-6-(3-morpholino-propoxy)quinazolin-4-amine), a selective thymidylate kinase inhibitor for the epidermal growth factor receptor (EGFR), was stu…
High Throughput Targeted Metabolomics Panels to Support Large Studies. Open
There is increasing need for throughput as the metabolomics studies are getting larger. Throughput can be achieved on the analytical side by using rapid methods or speeding up the data analysis and metabolite identification steps. Series o…
High fat diet causes distinct aberrations in the testicular proteome Open
Diet has important effects on normal physiology and the potential deleterious effects of high fat diets and obesity on male reproductive health are being increasingly described. We conducted a histological review of the effects of chronic …