Mass spectrometry

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Showing 1-30 of 162 results

Ion-Suppression & Phospholipid Contamination

We are presenting an article focusing on ion-suppression and phospholipid contamination and some of their major causes and difficulties.

Supel™-Select Polymeric SPE

Supel-Select HLB SPE - a hydrophilic modified styrene based polymer developed for the solid phase extraction of a broad range of compounds from aqueous samples.

Hopane Reference Standards for use as Petrochemical Biomarkers in Oil Field Remediation and Spill Analysis

We provide high-quality, relevant hopane reference standards to be used as biomarkers for petrochemical oil field remediation and spill analysis.

Rapid Determination of Protein Binding Affinity Using Solid Phase Microextraction

Accurate protein binding affinities were measured using bioSPME more rapidly than membrane dialysis (RED) techniques. Binding affinities correlated to the reference values.

Quantification of Infliximab in Human Serum by LC-MS/MS Using A Full-Length Stable Isotope Labeled Internal Standard

Infliximab, a chimeric monoclonal antibody, is used to treat rheumatoid arthritis, psoriatic arthritis, Crohn’s disease, and other autoimmune diseases.

Bioanalysis with SPME

Biocompatible SPME devices employ C18 bonded porous silica sorbent particles, in a binder which resists fouling by biological matrix components

Determination of Stevioside and Rebaudioside A in Stevia leaves, beverages and food additives using HPTLC-MS

HPTLC-MS was used to analyze stevioside and rebaudioside in artificial sweeteners, stevia plants, cola and isotonic drinks with a minimum of sample preparation.

Analysis of Tetrahydrocannabinol (THC) and Carboxytetrahydrocannabinol (THCCOOH) in Surface Waters by SPME and GC/MS

Evaluation of Different Enzymes on Hydrolysis Efficiencies of Glucuronide Drug Metabolites in Urine

β-glucuronidase (GUS) enzymes are utilized to hydrolyze glucuronide (gluc) drug metabolites to the parent drug, facilitating analysis by LC-MS/MS.

Rapid Trypsin Digestion of Complex Protein Mixtures for Proteomics Analysis

Reliable and reproducible results in mass spectrometry proteomics analyses are highly dependent on robust sample preparation.

Method Optimization for LC-MS Analysis of Vitamin D Metabolite Critical Pairs in Serum

Using HybridSPE-Phospholipid, Ascentis Express, and Other LC-MS Workflow Components

Method Optimization for LC-MS Analysis of Vitamin D Metabolite Critical Pairs in Serum

Novel sample prep technique coupled with the unique selectivity of the Ascentis Express F5 column enables a fast and simplified bioanalytical method for associated vitamin D metabolites.

HybridSPE-Phospholipid Technology

This Sigma-Aldrich article discusses how the HybridSPE-Phospholipid Technology works and how the phospholipids are removed.

Exactly Why is Low Bleed Important for Capillary Columns?

Quick, Sensitive LC/MS/MS Analysis of Aflatoxins in Cannabis

Analyte recovery values from spiked cannabis extracts ranged from 102 to 127% with RSD below 12% for 3 replicates. Excellent recovery values were even observed for Aflatoxins B2 and G2 which were spiked at a low level of 6.1 ppb.

Chromatography Profile Analysis of Phosphorothioate Oligonucleotides

The ultimate goal of most antisense research is to develop therapeutic agents for diseases such as diabetes, cancer, and HIV/ AIDS. Phosphorothioate oligonucleotides (commonly referred to as S-oligos) are often the molecules of choice because of their resistance to cellular

Ultrapure Water to Assess Elemental Impurities per USP

Elemental impurities in pharmaceutical drugs present a risk to human health and are regulated. Milli-Q® ultrapure water purification systems comply with the requirements for trace element analyses.

Characterization of Stable Isotope Caffeine as Reference Material for Isotope Dilution Mass Spectrometry

This technique is based on the direct proportionality of mass fraction ratio and signal intensity ratio of the natural isotope and the C-13 labeled caffeine.

Silylation of Non-Steroidal Anti-Inflammatory Drugs

Results of a study involving the ability few Fluka silylating reagents to form GC-MS-compatible trimethylsilylmethyl derivatives of NSAIDs

Silylation of Non-Steroidal Anti-Inflammatory Drugs

Results of a study involving the ability few Fluka silylating reagents to form GC-MS-compatible trimethylsilylmethyl derivatives of NSAIDs

Silylation of Non-Steroidal Anti-Inflammatory Drugs

Results of a study involving the ability few Fluka silylating reagents to form GC-MS-compatible trimethylsilylmethyl derivatives of NSAIDs

Quantification of Bitter Acids in Hops by Thin Layer Chromatography

HPTLC separation followed by UV detection of the bitter acid content in various hop samples.

Quantification of Bitter Acids in Hops by Thin Layer Chromatography

HPTLC separation followed by UV detection of the bitter acid content in various hop samples.

Comparison of QuEChERS Products for the Extraction of Planar Pesticides from Spinach

Supel™ QuE Verde combines a novel carbon with zirconia coated silica (Z-Sep+) to provide an optimum balance between planar pesticide recovery and color removal.

Comparison of QuEChERS Products for the Extraction of Planar Pesticides from Spinach

Supel™ QuE Verde combines a novel carbon with zirconia coated silica (Z-Sep+) to provide an optimum balance between planar pesticide recovery and color removal.

Comparison of QuEChERS Products for the Extraction of Planar Pesticides from Spinach

Supel™ QuE Verde combines a novel carbon with zirconia coated silica (Z-Sep+) to provide an optimum balance between planar pesticide recovery and color removal.

Ultrapure Water for LC MS Biomedical Analyses

This study assesses the suitability of ultrapure water from a Milli-Q® water system for sensitive LC-MS analyses of hormones.

Ultrapure Water for LC MS Biomedical Analyses

This study assesses the suitability of ultrapure water from a Milli-Q® water system for sensitive LC-MS analyses of hormones.

Vitamin D epi-Metabolites Separated with HybridSPE-Phospholipid

This Sigma-Aldrich article continues to detail new methodology for the analysis of Vitamin D metabolites using HybridSPE-Phospholipid technology.

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