The experimental data on vitamin C release suitably fits the
Korsmeyer Peppas equation with a goodness fit of unity (Table 5). The
equation parameters were obtained by plotting vitamin C releases in
log–log coordinates for 60 min of dissolution by repeating the same experiments with 10 tablets using a dissolution tester to increase the ratio
of solutes (vitamin C) to solution.
The value of exponent time (n) for NSD, KCL and EFA tablet formulations were within the 0.15–0.3 range with dissolution in distilled water,
HCl and buffer solution. Hence, the release exponent in the Korsmeyer–
Peppas model suggests that the mechanism of release of vitamin C from
the tablet form was a Fickian type. The Fickian type indicates a Fickian
diffusion where release occurs by the usual molecular diffusion of the
tablets due to a chemical potential gradient. Therefore, the rate of diffusion of mixed fruit tablets is not easily changed by physical agitation but
is strongly affected by the composition of the tablets [16].