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pKa, Log P/D Determination

Drug candidates show a tendency to exhibit low water solubility; as a result, present with issues measuring pKa by a traditional aqueous methods. Solid State Pharma  is capable of measuring compounds with low water solubility by using an organic co-solvent. Titrations are completed in a variety of water:co-solvent ratios to collect pKas of the substance; pKa can be then be extrapolated by a Yasuda-Shedlovsky plot.

UV-metric and pH-metric acquisition methods can used in conjunction with co-solvent methods to overcome compound solubility issues. Log P and log D are simultaneously measured through a series of titrations typically using 1-octonal as a partitioning solvent.

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