Author


Vincent Larraillet

Latest:

Monitoring of On-column Methionine Oxidation as Part of a System Suitability Test During UHPLC–MS/MS Peptide Mapping

Long-term column use can lead to on-column methionine oxidation during LC–MS/MS peptide mapping of antibody-based biotherapeutics. Following the approach described here minimizes the risk of measuring oxidative artifacts, and helps generate high quality data to provide reliable quantitative information about product-related heterogeneities.


Michael Mølhøj

Latest:

Monitoring of On-column Methionine Oxidation as Part of a System Suitability Test During UHPLC–MS/MS Peptide Mapping

Long-term column use can lead to on-column methionine oxidation during LC–MS/MS peptide mapping of antibody-based biotherapeutics. Following the approach described here minimizes the risk of measuring oxidative artifacts, and helps generate high quality data to provide reliable quantitative information about product-related heterogeneities.


David Fulchiron

Latest:

Size-Exclusion Chromatography for the Analysis of Complex and Novel Biotherapeutic Products

This study presents applications of size-exclusion chromatography (SEC) for characterization and quality control of novel biotherapeutic products, including antibody–drug conjugates, hydrophobic proteins, and coformulations. Examples of modifying SEC mobile-phase composition and running conditions to modulate the separation are discussed, as well as approaches and strategies for analyzing atypical protein products such as coformulations.


Jennifer Rea

Latest:

Size-Exclusion Chromatography for the Analysis of Complex and Novel Biotherapeutic Products

This study presents applications of size-exclusion chromatography (SEC) for characterization and quality control of novel biotherapeutic products, including antibody–drug conjugates, hydrophobic proteins, and coformulations. Examples of modifying SEC mobile-phase composition and running conditions to modulate the separation are discussed, as well as approaches and strategies for analyzing atypical protein products such as coformulations.


Luda Darer

Latest:

Size-Exclusion Chromatography for the Analysis of Complex and Novel Biotherapeutic Products

This study presents applications of size-exclusion chromatography (SEC) for characterization and quality control of novel biotherapeutic products, including antibody–drug conjugates, hydrophobic proteins, and coformulations. Examples of modifying SEC mobile-phase composition and running conditions to modulate the separation are discussed, as well as approaches and strategies for analyzing atypical protein products such as coformulations.


Whitney Shatz

Latest:

Ferritin as a Natural Protein Scaffold: Building a Multivalent Ferritin–Fab Conjugate

In this study, a conjugation strategy for Fab–ferritin conjugates, used for drug delivery, was successfully optimized using LC–MS. Characterization of the resulting conjugates was performed using SEC-MALS-QELS.


Yoge-shvar N. Kalia

Latest:

Ferritin as a Natural Protein Scaffold: Building a Multivalent Ferritin–Fab Conjugate

In this study, a conjugation strategy for Fab–ferritin conjugates, used for drug delivery, was successfully optimized using LC–MS. Characterization of the resulting conjugates was performed using SEC-MALS-QELS.


Robert F. Kelley

Latest:

Ferritin as a Natural Protein Scaffold: Building a Multivalent Ferritin–Fab Conjugate

In this study, a conjugation strategy for Fab–ferritin conjugates, used for drug delivery, was successfully optimized using LC–MS. Characterization of the resulting conjugates was performed using SEC-MALS-QELS.


Craig Blanchette

Latest:

Ferritin as a Natural Protein Scaffold: Building a Multivalent Ferritin–Fab Conjugate

In this study, a conjugation strategy for Fab–ferritin conjugates, used for drug delivery, was successfully optimized using LC–MS. Characterization of the resulting conjugates was performed using SEC-MALS-QELS.


Patrick Holder

Latest:

Ferritin as a Natural Protein Scaffold: Building a Multivalent Ferritin–Fab Conjugate

In this study, a conjugation strategy for Fab–ferritin conjugates, used for drug delivery, was successfully optimized using LC–MS. Characterization of the resulting conjugates was performed using SEC-MALS-QELS.


Remo Perozzo

Latest:

Ferritin as a Natural Protein Scaffold: Building a Multivalent Ferritin–Fab Conjugate

In this study, a conjugation strategy for Fab–ferritin conjugates, used for drug delivery, was successfully optimized using LC–MS. Characterization of the resulting conjugates was performed using SEC-MALS-QELS.


Julien Camperi

Latest:

Analytical Applications of Immobilized Enzyme Reactors (IMERs) Coupled to LC–MS/MS for Bottom- and Middle-Up Characterization of Proteins

Flow-through immobilized-enzyme reactors (IMERs) can streamline protein digestion for bottom- and middle-up LC–MS characterization while providing high accuracy and reproducibility.


Arthur John Schick

Latest:

Utilizing Multidimensional LC–MS for Hydroxyl Radical Footprinting Analysis

The potential of multidimensional online peptide mapping analysis as a strategy for improving a postlabeling workflow for protein–protein interactions is demonstrated using both hydroxy radical footprinting–mass spectrometry (HRF–MS) and LC–MS/MS.


Aaron T. Wecksler

Latest:

Utilizing Multidimensional LC–MS for Hydroxyl Radical Footprinting Analysis

The potential of multidimensional online peptide mapping analysis as a strategy for improving a postlabeling workflow for protein–protein interactions is demonstrated using both hydroxy radical footprinting–mass spectrometry (HRF–MS) and LC–MS/MS.


Fred Jacobson

Latest:

Development of a Size-Exclusion Chromatography Method to Characterize a Multimeric PEG–Protein Conjugate

A simple and robust size-exclusion chromatography (SEC) method has been developed for characterizing a multimeric PEG–protein conjugate. A wide range of size variants of the conjugate, ranging from 50 kDa to >1000 kDa, can be resolved and quantitated.


Joseph Elich

Latest:

Development of a Size-Exclusion Chromatography Method to Characterize a Multimeric PEG–Protein Conjugate

A simple and robust size-exclusion chromatography (SEC) method has been developed for characterizing a multimeric PEG–protein conjugate. A wide range of size variants of the conjugate, ranging from 50 kDa to >1000 kDa, can be resolved and quantitated.


Lu Dai

Latest:

Development of a Size-Exclusion Chromatography Method to Characterize a Multimeric PEG–Protein Conjugate

A simple and robust size-exclusion chromatography (SEC) method has been developed for characterizing a multimeric PEG–protein conjugate. A wide range of size variants of the conjugate, ranging from 50 kDa to >1000 kDa, can be resolved and quantitated.


Thomas J. Lauer

Latest:

Effects of Buffer Capacity in LC, Part II: Visualization of pH Changes Inside the Column

In situ measurements of the mobile-phase pH before and after the column help to rationalize the effects of mismatch in pH and concentration between the mobile phase and sample buffer mismatch in reversed-phase LC separations.


Brian A. Logue

Latest:

Sample Preparation Goes Subzero: Ice Concentration Linked with Extractive Stirrer (ICECLES)

A new technique, ice concentration linked with extractive stirrer (ICECLES), provides highly efficient isolation of trace compounds from aqueous samples. ICECLES combines freeze concentration with stir-bar sorptive extraction into a seamless analytical extraction methodology. This month, we discuss how to perform this relatively simple technique, and discuss its advantages and limitations.


Chris Skaggs

Latest:

Sample Preparation Goes Subzero: Ice Concentration Linked with Extractive Stirrer (ICECLES)

A new technique, ice concentration linked with extractive stirrer (ICECLES), provides highly efficient isolation of trace compounds from aqueous samples. ICECLES combines freeze concentration with stir-bar sorptive extraction into a seamless analytical extraction methodology. This month, we discuss how to perform this relatively simple technique, and discuss its advantages and limitations.


Abdullah H. Alluhayb

Latest:

Sample Preparation Goes Subzero: Ice Concentration Linked with Extractive Stirrer (ICECLES)

A new technique, ice concentration linked with extractive stirrer (ICECLES), provides highly efficient isolation of trace compounds from aqueous samples. ICECLES combines freeze concentration with stir-bar sorptive extraction into a seamless analytical extraction methodology. This month, we discuss how to perform this relatively simple technique, and discuss its advantages and limitations.


Niharika Budholiya

Latest:

A Review of Recent Developments in Analytical Characterization of Glycosylation in Therapeutic Proteins

Advanced separation and mass spectrometry methods enable comprehensive profiling of the inherent glycan heterogeneities of protein therapeutics. In particular, reversed-phase HPLC–based multiattribute methods (MAMs) provide a wealth of information, and other techniques, such as HILIC and CE-MS, also continue to evolve.


Peter Tattersall

Latest:

Cover Story - Technical Challenges Encountered During Chromatographic Method Transfers to Pharmaceutical Manufacturing Sites

Drug substance development requires a range of analytical methods to be developed to generate process knowledge and to support in-process and release testing throughout a synthetic sequence. This article describes practical examples of a wide variety of transfer challenges and our remediation strategy.


Jia Zang

Latest:

Cover Story - Technical Challenges Encountered During Chromatographic Method Transfers to Pharmaceutical Manufacturing Sites

Drug substance development requires a range of analytical methods to be developed to generate process knowledge and to support in-process and release testing throughout a synthetic sequence. This article describes practical examples of a wide variety of transfer challenges and our remediation strategy.


Frantisek Benes

Latest:

Determination of Seventeen Phytocannabinoids in Various Matrices by UHPLC–HRMS/MS

A simple ultrahigh-performance liquid chromatography high resolution tandem mass spectrometry (UHPLC−HRMS/MS) method to determine seventeen phytocannabinoids was developed and validated for Cannabis plants, resins and their extracts, and oils. The analysis was challenging because of the complexity of matrices, the large differences in the concentration of phytocannabinoids and their pattern in various cultivars, and the structural similarity of these analytes.


Zuzana Binova

Latest:

Determination of Seventeen Phytocannabinoids in Various Matrices by UHPLC–HRMS/MS

A simple ultrahigh-performance liquid chromatography high resolution tandem mass spectrometry (UHPLC−HRMS/MS) method to determine seventeen phytocannabinoids was developed and validated for Cannabis plants, resins and their extracts, and oils. The analysis was challenging because of the complexity of matrices, the large differences in the concentration of phytocannabinoids and their pattern in various cultivars, and the structural similarity of these analytes.


Zbynek Dzuman

Latest:

Determination of Seventeen Phytocannabinoids in Various Matrices by UHPLC–HRMS/MS

A simple ultrahigh-performance liquid chromatography high resolution tandem mass spectrometry (UHPLC−HRMS/MS) method to determine seventeen phytocannabinoids was developed and validated for Cannabis plants, resins and their extracts, and oils. The analysis was challenging because of the complexity of matrices, the large differences in the concentration of phytocannabinoids and their pattern in various cultivars, and the structural similarity of these analytes.


Petra Peukertova

Latest:

Cannabis Metabolomic Data Processing: Challenges to be Addressed

The challenges that arise during cannabis metabolomics analysis using ultrahigh-performance reversed-phase liquid chromatography coupled with high-resolution tandem mass spectrometry (UHPLC–reversed-phase–HRMS/MS) are presented.


Marie Fenclova

Latest:

Determination of Seventeen Phytocannabinoids in Various Matrices by UHPLC–HRMS/MS

A simple ultrahigh-performance liquid chromatography high resolution tandem mass spectrometry (UHPLC−HRMS/MS) method to determine seventeen phytocannabinoids was developed and validated for Cannabis plants, resins and their extracts, and oils. The analysis was challenging because of the complexity of matrices, the large differences in the concentration of phytocannabinoids and their pattern in various cultivars, and the structural similarity of these analytes.


Rocco Pacella

Latest:

Chicago Bound

Chicago, Illinois, USA, will host the 71st annual Pittcon conference and exposition. Thosands of separation scientists from across the globe and from a wide spectrum of industries will gather at the McCormick Place convention centre to discuss, investigate, and assess the latest scientific advances in technology and instrumentation.