Articles by Karyn M. Usher - Chromatography Online
Articles by Karyn M. Usher

Karyn M. Usher


Articles
Agilent EU - Determination of Parabens in Body Wash using Solid-Supported Liquid?Liquid Extraction
July 25, 2014

This application note describes the extraction and analysis of four parabens from an infant shampoo/body wash using solid-supported liquid?liquid extraction (SLE) cartridges and an Agilent 1200 HPLC system.

Agilent NA - Determination of Parabens in Body Wash using Solid-Supported Liquid-Liquid Extraction
June 19, 2014

This application note describes the extraction and analysis of four parabens from an infant shampoo/body wash using solid-supported liquid-liquid extraction (SLE) cartridges and an Agilent 1200 HPLC system.

Agilent NA - Analysis of Phthalates in Body Wash using Solid-Supported Liquid-Liquid Extraction
May 22, 2014

This application note describes the extraction and analysis of four phthalates from an infant shampoo/body wash using solid-supported liquid-liquid extraction (SLE) cartridges and an Agilent 1200 HPLC system.

Agilent EU - Analysis of Phthalates in Body Wash using Solid-Supported Liquid-Liquid Extraction
May 22, 2014

This application note describes the extraction and analysis of four phthalates from an infant shampoo/body wash using solid-supported liquid-liquid extraction (SLE) cartridges and an Agilent 1200 HPLC system.

Back to the Basics: Considering Carryover, Column Back Pressure, and Wavelength When Developing Chromatographic Methods
October 2, 2013

The parameters that should be considered in the optimization of HPLC methods are explained and then illustrated through the analysis of two commercial agricultural products.

Back to the Basics: Considering Carryover, Column Back Pressure, and Wavelength When Developing Chromatographic Methods
April 1, 2013

The parameters that should be considered in the optimization of HPLC methods are explained and then illustrated through the analysis of two commercial agricultural products.

Phyllis Brown: A Story of Serendipity, Perseverance, Vision, and Chromatography
November 1, 2012

In the 1960s, high performance liquid chromatography (HPLC) was in its infancy and Phyllis Brown was a pioneer at the forefront of the technique.

Separation, Identification, and Quantitation of Water-Soluble Vitamins by HPLC
March 1, 2009

The authors set out to perform a separation of seven water-soluble vitamins without the use of ion-pair reagents.

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LCGC COLUMNISTS 2014

Sample Prep Perspectives | Ronald E. Majors: Ron Majors, established authority on new column technologies, keeps readers up-to-date with new sample preparation trends in all branches of chromatography and reviews developments.
LATEST: UV Detector Problems


Perspectives in Modern HPLC | Michael W. Dong: Michael W. Dong is a senior scientist in Small Molecule Drug Discovery at Genentech in South San Francisco, California. He is responsible for new technologies, automation, and supporting late-stage research projects in small molecule analytical chemistry and QC of small molecule pharmaceutical sciences. LATEST: Superficially Porous Particles: Perspectives, Practices, and Trends


MS — The Practical Art | Kate Yu: Kate Yu brings her expertise in the field of mass spectrometry and hyphenated techniques to the pages of LCGC. In this column she examines the mass spectrometric side of coupled liquid and gas-phase systems. Troubleshooting-style articles provide readers with invaluable advice for getting the most from their mass spectrometers. LATEST: Radical Mass Spectrometry as a New Frontier for Bioanalysis


LC Troubleshooting | John Dolan: LC Troubleshooting sets about making HPLC methods easier to master. By covering the basics of liquid chromatography separations and instrumentation, John Dolan is able to highlight common problems and provide remedies for them. LATEST: Problems with Large-Molecule Separations


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