Abstract
Simultaneous improvement of solubilization kinetics of main flavolignans of Silybum marianum extract was obtained cogrinding with two crosslinked polymers: micronized crospovidone, PVP-CL® and sodium carboxymethylcellulose, Ac-Di-Sol® in the 1:3 active-to-polymer weight ratio. By this process it was assessed that the main extract components lost its crystalline structure, and the powder surface area was increased by 2.1- and 1.7-fold in the coground products with Ac-Di-Sol® and PVP-CL®, respectively. This activated status of the dry extract remained stable over a period of 2 years. Solubilization kinetics resulted ameliorated both in terms of entire dry extract and in terms of single components. When the 1/3 coground systems with PVP-CL® and Ac-Di-Sol® were dissolved in saturated conditions they gave a concentration improvement compared to the native product of 8 and 31 times of silybin A, 7 and 27 times of silybin B, whereas in the case of silychristin a double concentration was obtained only using Ac-Di-Sol®. The in vivo studies on rats confirmed that this solubilization improvement corresponded to an effective oral bioavailability enhancement. The highest bioavailability improvement was obtained with Ac-Di-Sol®, with a relative bioavailability of 88.6, 17.96, and 16.4 compared to the extract for silybin A, silybine B, and silychristine, respectively.
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