When developing analytical methods, several parameters are often considered, things like solvent type and amount, sample size, pH, sorptive phases, temperature, time, and more. While some of these considerations can be considered unimportant in a given situation and experience and chemical knowledge can guide us to appropriate starting points, extraction method development is often a one-parameter-at-a-time proposition. A family of statistical approaches, which fall under the category of response surface methodology, are available to screen and optimize several parameters simultaneously.
The 54th International Symposium on High Performance Liquid Phase Separations and Related Techniques (HPLC 2025) will be held from Sunday through Thursday, June 15-19, 2025, in Bruges, Belgium.
Compact mass spectrometry, in combination with suitable sample introduction techniques-such as the atmospheric solids analysis probe, thin-layer chromatography, and classical liquid chromatography techniques-can be used effectively for the detection and quantification of cannabinoids and pesticides in cannabis-related material and contraband.
Experiments presented here demonstrate the suitability of LC–SAI-MS for the detection and quantification of pharmaceuticals, with limits of detection in the low parts-per-trillion range. A comparison of LC–ESI-MS to LC–SAI-MS also yielded favorable results for SAI.
With this method, a single injection was sufficient to characterize the amino acid sequence with complete sequence coverage. In addition, glycosylation and drug-loaded peptides could be identified from MS/MS spectra. A drug-loaded peptide fragmentation mass spectra study yielded drug-specific fragments, which reinforced the confidence about the identifications. The results reveal the ability of the sheathless CZE–MS/MS method to characterize an ADC’s primary structure in a single experiment.
An analytical methodology for the characterization of the primary structure of biotherapeutic proteins using sheathless CE–ESI-MS-MS instrumentation is presented. For the first time, complete sequence coverage can be achieved using a bottom-up proteomic approach from a single analysis of a tryptic digest. In a biosimilarity assessment, a single amino acid substitution was detected.
With this method, a single injection was sufficient to characterize the amino acid sequence with complete sequence coverage. In addition, glycosylation and drug-loaded peptides could be identified from MS/MS spectra. A drug-loaded peptide fragmentation mass spectra study yielded drug-specific fragments, which reinforced the confidence about the identifications. The results reveal the ability of the sheathless CZE–MS/MS method to characterize an ADC’s primary structure in a single experiment.
An analytical methodology for the characterization of the primary structure of biotherapeutic proteins using sheathless CE–ESI-MS-MS instrumentation is presented. For the first time, complete sequence coverage can be achieved using a bottom-up proteomic approach from a single analysis of a tryptic digest. In a biosimilarity assessment, a single amino acid substitution was detected.
The impact of ionic strength, buffer capacity, and pH-response on the retention behavior and peak shape of mAb species characterization is evaluated for IEX-MS. The aim of the present study was to understand the impact of ionic strength, buffer capacity, and pH-response on the retention behavior and peak shape of mAb species.
With this method, a single injection was sufficient to characterize the amino acid sequence with complete sequence coverage. In addition, glycosylation and drug-loaded peptides could be identified from MS/MS spectra. A drug-loaded peptide fragmentation mass spectra study yielded drug-specific fragments, which reinforced the confidence about the identifications. The results reveal the ability of the sheathless CZE–MS/MS method to characterize an ADC’s primary structure in a single experiment.
Ionic contaminants in the water used in UHPLC analyses with MS detection method lead to adduct formation and reduced analytical signals because of ion suppression. In MS, the preferred ion type is the protonated molecular ion, especially in peptide analysis, since the partially mobile proton charge enables more meaningful fragmentation analysis, as compared to a sodiated peptide ion. Moreover, the occurrence of protonated analyte signals indicates that solvents and reagents, as well as the MS instrument used in analyses, are clean and do not contribute any contaminating cationic components to the analytical process. In the experiments presented here, it was observed that the signal intensities of the protonated species decreased as the sodium ion concentration in the water increased. This was accompanied by an increase in the intensity of sodiated adducts.
To translate the enormous potential of MS into meaningful, actionable, and safe test results in the specific setting of a clinical laboratory is a very substantial challenge. It is essential to realize that reliability is not inherent to this technology but must be addressed carefully and questioned systematically.
This article presents a method for comparing the levels of baseline interference arising from common laboratory mobile phase contamination sources and assesses different approaches for removing dissolved contaminants to generate interference-free chromatogram baselines. The authors demonstrate that recirculating mobile phase through a semi-preparative scale column using a reagent delivery pump has advantages over previously published mobile phase decontamination methods.
This article presents a method for comparing the levels of baseline interference arising from common laboratory mobile phase contamination sources and assesses different approaches for removing dissolved contaminants to generate interference-free chromatogram baselines. The authors demonstrate that recirculating mobile phase through a semi-preparative scale column using a reagent delivery pump has advantages over previously published mobile phase decontamination methods.
This article presents a method for comparing the levels of baseline interference arising from common laboratory mobile phase contamination sources and assesses different approaches for removing dissolved contaminants to generate interference-free chromatogram baselines. The authors demonstrate that recirculating mobile phase through a semi-preparative scale column using a reagent delivery pump has advantages over previously published mobile phase decontamination methods.
LC Determination of Residual Primary Amine Content in Epoxy-Amine Adducts
This article demonstrates the superiority of the GC-MS approach over spectrophotometry.
GC–MS Analysis of Aroma Compounds in Edible Oils by Direct Thermal Desorption
The monomer bisphenol A (BPA) is used to make polycarbonate plastic and epoxy resins and has been present in many plastic bottles and metal food and drinks cans since the 1960s.
Understanding the chemistry of embedded polar group and perfluorophenyl phases leads to better decisions during method developement
High fat content of foods has been a problem when analyzing samples for nonpolar contaminants such as pesticides, PCBs, and PAHs. Extraction methods for these compounds tend to generate samples that are highly contaminated with fatty matrix, causing a number of problems with the subsequent chromatographic analysis. Traditional cleanup techniques, such as gel permeation chromatography (GPC) and normal phase column chromatography can be very effective, but are often expensive and time consuming. In this seminar, we will present an alternative approach to the cleanup of fats using a novel zirconia-based family of sorbents, for both QuEChERS (dispersive SPE) and traditional cartridge SPE.
Toxicology Laboratory at the Veterans Administration, Portland, Oregon, USA, Agilent Technologies
Advances in Sample Preparation: Removing Phospholipids from Biological Samples
Advances in Sample Preparation: Removing Phospholipids from Biological Samples
How to modernize an older pharmaceutical monograph from an HPLC column to an UHPLC column, along with calculated time and solvent savings.
Disinfection by-products (DBP) are an ever-present nuisance in the efforts to purify drinking water, wastewater, and municipal waters from various sources.
A summary of the most recent advances in sample preparation, instrumentation, and data-processing techniques for MALDI-IMS