High-resolution bioactivity profiling of mixtures toward the acetylcholine binding protein using a nanofractionation spotter technology |
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Authors: | Kool Jeroen Heus Ferry de Kloe Gerdien Lingeman Henk Smit August B Leurs Rob Edink Ewald De Esch Iwan J P Irth Hubertus Niessen Wilfried M A |
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Affiliation: | BioMolecular Analysis, Department of Chemistry and Pharmaceutical Sciences, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, Amsterdam, the Netherlands. j.kool@few.vu.nl |
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Abstract: | This study describes the evaluation, validation, and use of contactless postcolumn fractionation of bioactive mixtures with acetylcholine binding protein (AChBP) affinity analysis with help of a spotter technology. The high-resolution fractionation tailors the fractionation frequency to the chromatographic peaks. Postcolumn reagents for AChBP bioaffinity profiling are mixed prior to droplet ejection into 1536-well plates. After an incubation step, microplate reader analysis is used to determine bioactive compounds in a mixture. For ligands tested, a good correlation was found for IC(50)s determined in flow injection analysis mode when compared with traditional radioligand binding assays. After the evaluation and validation, bioaffinity profiling of actual mixtures was performed. The advantage of this "atline" technology using postcolumn bioaffinity analysis when compared to continuous flow online postcolumn bioaffinity profiling is the possibility to choose postcolumn incubation times freely without compromising resolution due to diffusion effects. |
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