Author


John D. Orr

Latest:

Validation of Impurity Methods, Part II

Second column in a series that reviews impurity method validation guidelines.


S. Kueppers

Latest:

Practical Aspects of Preparative HPLC in Pharmaceutical Development and Production

This month's installment discusses the practical aspects of the scale-up process and the problems and costs of preparative separations within a mid-sized pharmaceutical company.


A. Brandt

Latest:

Practical Aspects of Preparative HPLC in Pharmaceutical Development and Production

This month's installment discusses the practical aspects of the scale-up process and the problems and costs of preparative separations within a mid-sized pharmaceutical company.


I. Chappell

Latest:

The Benefits of Reversed Phases with Extended Polar Selectivity in Analyzing Wide-Polarity-Range Samples

This article describes the use of phases with extended polar selectivity to reduce analysis time for wide-polarity-range samples such as an insecticide, simulated carboxylic acid degradants, and phthalate esters.


Terry Franey

Latest:

A Volatile Ion-Pairing Chromatography Reagent for an LC–MS Mobile Phase

This article presents a volatile ion-pairing reagent that enables good retention of highly polar anionic species using reversed-phase LC–MS.


G. William Tindall

Latest:

Mobile-Phase Buffers, Part III — Preparation of Buffers

Guest author Tindall's final installment of a three-part series about buffers.


András Guttman

Latest:

Rapid Adeno-Associated Virus Genome Integrity Analysis by Capillary Gel Electrophoresis

In this paper, two adeno-associated virus (AAV) genome integrity analysis workflows are introduced; a standard sample preparation protocol and an accelerated procedure, both utilizing capillary gel electrophoresis with laser induced fluorescent detection (CGE–LIF) to analyze the released nucleic acids.


Bruce Flickinger

Latest:

GC Instruments and Accessories at the 54th Pittsburgh Conference

The authors describe GC product introductions at Pittcon 2003.


Matthew C. Allgeier

Latest:

Comparison of an Evaporative Light-Scattering Detector and a Chemiluminescent Nitrogen Detector for Analyzing Compounds Lacking a Sufficient UV Chromophore

The authors discuss the advantages and disadvantages of evaporative light-scattering detection and chemiluminescent nitrogen detection for determining compounds lacking UV chromophores.


Lennart Mathiasson

Latest:

Membrane Extraction for Sample Preparation

The guest authors describe sample preparation techniques based on liquid membrane extraction.


Moira C. Ringo

Latest:

Mobile-Phase Cleanup Using Solid-Phase Extraction Disks

The authors describe a fast, simple procedure for purifying mobile phase that uses SPE disks during the filtration step.


Mark A. Nussbaum

Latest:

Comparison of an Evaporative Light-Scattering Detector and a Chemiluminescent Nitrogen Detector for Analyzing Compounds Lacking a Sufficient UV Chromophore

The authors discuss the advantages and disadvantages of evaporative light-scattering detection and chemiluminescent nitrogen detection for determining compounds lacking UV chromophores.


Christopher L. Basel

Latest:

Critical Pairs in Column Chromatography: A Primer for Pharmaceutical Method Validation

This article reviews several common applications of the critical-pair approach to column chromatography as it is applied under pharmaceutical guidelines and validation strategies.


Danna M. Mattocks

Latest:

Mobile-Phase Cleanup Using Solid-Phase Extraction Disks

The authors describe a fast, simple procedure for purifying mobile phase that uses SPE disks during the filtration step.


John R. Allen

Latest:

Mobile-Phase Cleanup Using Solid-Phase Extraction Disks

The authors describe a fast, simple procedure for purifying mobile phase that uses SPE disks during the filtration step.


David T. Rossi

Latest:

Breaking Down Barriers: Can LC–MS Revolutionize the Quantitation of Drug Product Impurities?

The authors test and compare performance of three types of LC–MS systems for precision, linearity, selectivity, accuracy, and sensitivity in the quantitation of drug impurities.


Jan Åke Jönsson

Latest:

Membrane Extraction for Sample Preparation

The guest authors describe sample preparation techniques based on liquid membrane extraction.


F.-T.A. Chen

Latest:

Interactions of Enantiomers of Aromatic Amino Acids with Highly Sulfated Cyclodextrins

The author reports a comparative study of the interaction of aromatic amino acids with a class of highly sulfated cyclodextrins as the chiral selectors by capillary electrophoresis.


David A. Weil

Latest:

Directions in Automated Sample Preparation of Proteins

The guest authors discuss current procedures for protein sample preparation, protein analysis, and automation.


Cédric Saucier

Latest:

Estimation of Triterpenes in Wines, Spirits, and Oak Heartwoods by LC–MS

The authors report the use of LC–MS for monitoring triterpenes in oak heartwoods, wines, and spirits.


Olga Issakova

Latest:

Intelligent Automation of LC–MS Analysis for the Characterization of Compound Libraries

This article reports an approach to applying intelligent automation for high-throughput LC}MS analysis of compound libraries using Microsoft Visual Basic software.


Robert C. Richter

Latest:

Microwave-Assisted Organic Extraction and Evaporation: An Integrated Approach

The authors present integrated microwave extraction as an enhanced version of microwave-assisted solvent extraction in which solvents are optimized for chemistry and microwave absorption is modified using secondary microwave absorbers.


Sejal Shah

Latest:

Microwave-Assisted Organic Extraction and Evaporation: An Integrated Approach

The authors present integrated microwave extraction as an enhanced version of microwave-assisted solvent extraction in which solvents are optimized for chemistry and microwave absorption is modified using secondary microwave absorbers.


Shu-Hui Chen

Latest:

Microchip Electrophoresis and the Analysis of Polymerase Chain Reaction Products

The author compares chip-based electrophoretic methods with existing methods and competitors.


Nikolai Sepetov

Latest:

Intelligent Automation of LC–MS Analysis for the Characterization of Compound Libraries

This article reports an approach to applying intelligent automation for high-throughput LC}MS analysis of compound libraries using Microsoft Visual Basic software.


Hajime Ohtani

Latest:

GC–MS Analysis of Heart-Cut Fractions During Evolved Gas Analysis of Polymeric Materials

The authors describe the characterization of polymers and additives using a novel heart-cut evolved gas analysis GC–MS method.


Akihiko Hosaka

Latest:

GC–MS Analysis of Heart-Cut Fractions During Evolved Gas Analysis of Polymeric Materials

The authors describe the characterization of polymers and additives using a novel heart-cut evolved gas analysis GC–MS method.


Raymond J. Weigand

Latest:

An Efficient Approach to Column Selection in HPLC Method Development

The authors present an efficient, informed approach to HPLC column selection based upon complementary decisions regarding bonded-phase and particle physical characteristics.


Paul Tobias

Latest:

GC–MS Analysis of Heart-Cut Fractions During Evolved Gas Analysis of Polymeric Materials

The authors describe the characterization of polymers and additives using a novel heart-cut evolved gas analysis GC–MS method.


Yoshio Kawahara

Latest:

GC–MS Analysis of Heart-Cut Fractions During Evolved Gas Analysis of Polymeric Materials

The authors describe the characterization of polymers and additives using a novel heart-cut evolved gas analysis GC–MS method.