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Many active compounds may be excluded from biological assays due to their low aqueous solubility. In this study, a simple method for the determination of the solubility of compounds containing aromatic rings is proposed. In addition to DMSO, five organic solvents for screening experiments of TNF-α inhibitors were explored. DMSO and PEG3350 were the most suitable for both protein stability and ligand-binding experiments. In addition, glycerol is a promising solvent for the screening of other compounds for which it might provide acceptable solubilization, due to its strong tendency to preserve the protein. Moreover, a fluorescence binding assay was developed using the TNF-α/SPD304 system, and a K d of 5.36 ± 0.21 μM was determined. The results of this study could be used for the future screening of potential TNF-α inhibitors, while the protocols developed in this work could be applied to other proteins.
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Papaneophytou et al. (2012) studied this question.
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