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Pharmaceutical counterion determination

House lights down, stage lights up - von Dr Frank Steiner, Dr Carsten Paul, Dr Mark Tracy

In contemporary practice, roughly half of all active pharmaceutical ­ingredients (APIs) are administered as salts. The use of the protonated ­or deprotonated form of the drug substance combined with the selection of counterions enables the targeted variation of key parameters, such as solubility and stability. Analysis of the corresponding counterions constitutes an essential part of the development process for new pharmaceuticals and is now an...