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Journal of Biomolecular Screening
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Cherry-Picking in an Orchard: Unattended LC/MS Analysis from an Autosampler with >32,000 Samples Online

Nader Ari

The Genomics Institute of the Novartis Research Foundation, San Diego, California; GNF 10675 John J. Hopkins Drive San Diego, CA 92121 nari{at}gnf.org

Lucas Westling

John Isbell

The Genomics Institute of the Novartis Research Foundation, San Diego, California

The 1536-well microplate format has widely supplanted the 384-well microplate format for high-throughput screening and for IC50 assays. Previously, liquid chromatography/mass spectrometry (LC/MS) analyses of such samples required manual transfers of the wells of interest from a 1536-well plate into a 384-well plate. Because this manual transfer introduced a source of potential error, it became clear that amore appropriate solutionwould be to sample directly from the 1536-well plates. Currently, commercially available 1536-well plate autosamplers are not compatible with Waters LC/MS systems. The authors have modified their CTC PAL autosampler to support injection from up to twenty-four 1536-well plates. This allows them to cherry-pick any sample from up to 36,864 wells on the autosampler. Because of its success at this Institute, sampling from 1536-well plates has not only become the preferredmethod for LC/MS analysis from IC50 plates but also become the standard format used for the handling of and the sampling from large combinatorial libraries.

Key Words: high-throughput screening • IC50 assays • LC/MS • 1536-well microplate

This version was published on April 1, 2006

Journal of Biomolecular Screening, Vol. 11, No. 3, 318-322 (2006)
DOI: 10.1177/1087057105285837
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