Multidisciplinary approach on characterizing a mechanochemically activated composite of vinpocetine and crospovidone

Significant improvement of solubilization kinetics of poorly soluble vinpocetine was obtained through a mechanochemical activation process in presence ofmicronized crospovidone. Drug-to-polymer weight ratio and milling time variables resulted to have statistically significant impacts on the activation of the product. The complete amorphization was obtained in the coground with the highest crospovidone contents, milled for the longest time. A software was then used to calculate the dimensions of the drug crystallites in the samples on the basis of the calorimetric data. The thermal analyses were then accompanied and confirmed by X-ray diffraction, Raman imaging/spectroscopy, DRIFT, and SS-NMR spectroscopy, followed by laser diffraction and solubilization kinetics tests. This activated status of the drug, which resulted to be homogeneously distributed on the coground sample and stable for at least 1 year, was reflected on favorable solubilization kinetics and oral bioavalability.