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Aqueous solubility is one of the key factors that determines the oral bioavailability of a drug. Being related to ADME-Tox descriptors, it is one of the main physico-chemical properties to be optimized in drug discovery. Solubility of a compound is the concentration in equilibrium with the solid phase that is dissolved into the solution. Instead of the concentration its natural logarithm, logS, is used for convenience in the literature. In JChem for Excel two functions are related to this property:



There are many types of solubility defined in the literature, most of the methods developed for in-silico prediction calculates intrinsic solubility for a given compound, which is the solubility of the un-ionized form in the absence of acids or bases.

Parameters: Molecule, pH.

In JChem for Excel you can calculate aqueous, intrinsic solubility of a compound if you don't specify pH value. If the pH value is specified, it will  be taken into account during the calculation.



In case only a rough estimation is needed, the plugin can give a solubility category as a qualitative measure. These categories are:


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