The
effect of the integration between MCM-48 and some biopolymers (starch, chitosan, and β-cyclodextrin) on
enhancing the pharmaceutical properties of MCM-48 as advanced carriers
for the 5-fluorouracil drug was studied considering the loading capacities
and the release profiles. The prepared carriers are MCM-48/chitosan
(MCM/CH), MCM-48/starch composite (MCM/ST), and MCM-48/β-Cyclodextrin
(MCM/CD). They emphasized excellent 5-Fu loading capacities of 141.2
mg/g (MCM-48), 156.6 mg/g (MCM/ST), 191 mg/g (MCM/CH), and 170 mg/g
(MCM/CD), reflecting significant enhancement in the loading capacities.
The kinetic and equilibrium investigation suggested physisorption
loading of 5-Fu drug in a monolayer form for MCM-48, MCM/ST, and MCM/CH
(Langmuir) and in a multilayer form for MCM/CD (Freundlich). This
was supported by the estimated adsorption energies (0.23 kJ/mol (MCM-48),
0.26 kJ/mol (MCM/ST), 0.3 kJ/mol (MCM/CH), and 0.75 kJ/mol (MCM/CD))
and the thermodynamic parameters of free energy and enthalpy. The
obtained release profiles for 80 h reflected significant controlling
for the releasing behavior of MCM/48 on integrating its structure
by adjusting the type of the selected polymer and its ratio. The pharmacokinetic
modeling and the diffusion exponent from the Korsmeyer–Peppas
model suggested non-Fickian transport behavior (a combination of erosion
and diffusion releasing mechanism) for MCM/ST, MCM/CH, and MCM/CD
and Fickian diffusion behavior (diffusion releasing mechanism) for
MCM-48.
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