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In our June issue:
Columns
 Column Watch
 Evaluation of Retention and Selectivity Using Biphenyl Stationary Phases
David S. Bell, Daniel Shollenberger, and Hugh Cramer
In biphenyl phases, the surface chemistry often makes it possible to separate compounds not well resolved by C18 or phenyl phases.
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LC Troubleshooting
 Method Adjustment the USP Way
John W. Dolan
How much of a change can you make to a USP method without revalidating the method?
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Perspectives in Modern HPLC
 UHPLC, Part I: Perspectives and Instrumental Features
Michael W. Dong
In this three-part series, we assess how UHPLC evolved into a modern platform. We start by examining the most important features common to most commercial instruments.
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Focus on Biopharmaceutical Analysis
 Applicability of Hydrogen–Deuterium Exchange in Comparing Conformations of Innovator to Biosimilar Biopharmaceutical Products
R.E. Iacob, J.R. Engen, and I.S. Krull
Significant recent advances now enable routine usage of HDX-MS for comparing the conformations of biopharmaceutical products.
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The Essentials
 Critical Evaluation of HPLC Methods: Working with Ionizable Analytes
Improve your analysis of ionizable analytes with these hints and tips.
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PEER-REVIEWED ARTICLE
 Utility of the Summation Chromatographic Peak Integration Function to Avoid Manual Reintegrations in the Analysis of Targeted Analytes
Steven J. Lehotay
We present an empirical assessment of summation integration involving 490 low-pressure GC–MS/MS analyses of 70 pesticides in 10 common fruits and vegetables over the course of 10 days.
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ON DEMAND WEBCASTS
A Risk-Based Approach to Reviewing Electronic Chromatographic Data and Audit Trails with Data Integrity in Mind
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Characterization of Substances in Food Packaging Migration Studies using LC- and GC- coupled to High Resolution Accurate Mass (HRAM) Mass Spectrometry
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Editors' Series: Sample Preparation: The Forgotten Dimension in HPLC
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