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• W2023458249 abstract "The isothermal kinetics of in vitro nicotinamide release from poly(acrylic‐ co ‐methacrylic acid) loaded xerogel into water was evaluated. The isothermal kinetics curves of nicotinamide release from poly(acrylic‐ co ‐methacrylic acid) xerogel were measured at different temperatures ranging from 296 K to 315 K. It was proven that the kinetics of nicotinamide release from poly(acrylic‐ co ‐methacrylic acid) xerogel was a kinetically complex process which was neither controlled by the processes of drug diffusion nor with the relaxation of the xerogel. The kinetic of nicotinamide release from poly(acrylic‐ co ‐methacrylic acid) may be described by the kinetics model of reversible first order chemical reaction and the apparent activation energy have value of E a,M = 14.1 kJ mol −1 and preexponential factor ln( A M min −1 ) = 2.3. The rate constants of nicotinamide release ( ) and the rate constants of its reversible absorption reaction ( ) were calculated and found to fall within the range 0.019 min −1 −0.033 min −1 for and 0.014 min −1 −0.016 min −1 for . The value of activation energy for the nicotinamide releas, E a.R =21.25 kJ mol −1 , is significantly higher than the value for the process of nicotinamide absorption ( E a,A = 2.6 kJ mol −1 ). The rate of nicotinamide release was predetermined with the rate of nicotinamide molecules distribution between the hydrogel and surrounding solution. POLYM. ENG. SCI., 55:60–69, 2015. © 2014 Society of Plastics Engineers" @default.
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• W2023458249 date "2014-02-10" @default.
• W2023458249 modified "2023-10-06" @default.
• W2023458249 title "The kinetics of isothermal nicotinamide release from poly(acrylic-co -methacrylic acid) loaded xerogel" @default.
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• W2023458249 doi "https://doi.org/10.1002/pen.23870" @default.
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