Pharmaceutical Analysis

LC-MS monitoring of the drug clozapine is detailed along with a description of the overall system architecture, workflow, and maintenance routines that spport a large-scale drug monitoring program.

Hyaluronic acid (HA) is a naturally occurring, unbranched polysaccharide that consists of alternately repeating D-glucuronic acid and N-acetylglucosamine units. This biopolymer is present throughout all mammalian systems but occurs primarily in synovial (joint) fluid, vitreous humor, and various loose connective tissues (such as rooster comb) (1). HA is of enormous commercial interest for ophthalmic, medical, pharmacological, and cosmetic applications.

In this month's installment of "Directions in Discovery," the authors discuss how, with the arrival of combinatorial libraries and high-throughput screening, pharmaceutical firms can develop new models of drug discovery that not only lessen the initial capital outlay involved in drug discovery, but also refine the discovery process.

A simple HPLC procedure is described for the determination of bendroflumethiazide (BMFT) in pharmaceutical formulations and urine samples. No interferences from common additives or other drugs frequently administered with BMFT or from endogenous compounds in urine samples were found. The lack of an organic solvent in the mobile phase reduces the risk of environmental contamination and human toxicity.

A new detection method based upon aerosol charging was examined for its applicability and performance with high performance liquid chromatography (HPLC). Our results demonstrate universal detection of nonvolatile analytes with response magnitude that is independent of analyte chemical properties, four orders of magnitude dynamic range, low nanogram, lower limits of detection, and < 2% relative standard deviation response variability. Broad applicability was demonstrated for a range of methods including those using gradient elution, reversed phase, hydrophilic interaction, and ion chromatography; normal and narrow bore column formats; and in combination with other detectors (for example, UV detectors, evaporative light-scattering detectors, and mass spectrometers).

A new detection method based upon aerosol charging was examined for its applicability and performance with high performance liquid chromatography (HPLC). Our results demonstrate universal detection of nonvolatile analytes with response magnitude that is independent of analyte chemical properties, four orders of magnitude dynamic range, low nanogram, lower limits of detection, and < 2% relative standard deviation response variability. Broad applicability was demonstrated for a range of methods including those using gradient elution, reversed phase, hydrophilic interaction, and ion chromatography; normal and narrow bore column formats; and in combination with other detectors (for example, UV detectors, evaporative light-scattering detectors, and mass spectrometers).

This month'ss "Directions in Discovery" column discusses current work in the use of capillary isoelectric focusing and mass spectrometry as a multidimensional separation technique for proteomic studies.

How the use of peptide standards can indicate control as well as provide guidelines for method development.

This article describes the optimum performance laminar chromatography technique and gives a brief account of recent applications in which it has been used.

Wehr discusses strategies for coupling LC and CE with MALDI&#150;MS for use in proteomic studies.

Two solutions to the problem of obtaining quantitative information about protein expression are to couple two or more chromatographic modes to increase resolution and to use affinity selection techniques.

This column describes the principles of stir-bar sorptive extraction and presents some typical applications.

Tim Wehr looks at the requirements of multidimensional LC and provides examples of some systems used in proteomics.

Tim Wehr looks at the use of fast LC}MS for high-throughput analysis of pharmaceutical compounds.

Wehr defines 50 key terms that have come into common use in the era of genomics and proteomics.

This "CE Currents" column examines the use of capillary electrophoresis (CE) in three important areas of pharmaceutical analysis.

This month Tim Wehr discusses traditional approaches to protein characterization.

Wehr examines developments discussed at "CE in the Pharmaceutical Industry," a symposium sponsored by the California Separation Science Society.

In this first installment of this new column, editor Tim Wehr explores the evolution of drug discovery and the analytical challenges that lie ahead.

Krull and Swartz examine validating cleaning methods for pharmaceutical manufacturing equipment and look at general requirements and specific cleaning procedures, sampling types, and analytical methods.