Physicochemical Characterization of Methotrexate—Bovine Serum Albumin Conjugates

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Abstract
Physicochemical parameters have been determined for a series of methotrexate-bovine serum albumin conjugates produced using a water-soluble carbodiimide. Drug coupling produces a heterogeneous product consisting of mixtures of albumin and albumin polymers with varying quantities of covalently bound drug. Due to this heterogeneity, the measurement of absolute physicochemical values was not possible but two factors producing change were evident. The water soluble carbodiimide is responsible for major changes by producing polymers that dominate the properties of the conjugates. The changes induced by the covalently attached drug are less dramatic but still appreciable. The results emphasize that both the attached drug and the method of coupling are significant factors in altering the physicochemical properties of proteinaceous drug carriers.