Abstract
Lidocaine is a primary local anesthesia that blocks the ionic fluxes required for the beginning and operation of impulses in the neuronal membrane. The benefits of local anesthetics, such as enhancing patient acceptance, prohibiting systemic toxicity and delivering continuous drug delivery, make them the attracting field for pharmaceutical researchers. The nanoparticles were prepared by solvent evaporation W1/O/W2 emulsion method and in the ratios of 1 to 1, 1 to 2 and 1 to 3 drug to polymer. The production yield, loading efficiency, particle size, poly dispersity index and zeta potential of selected formulation were 84.30%, 80.60%, 192[Formula: see text]nm, 0.18[Formula: see text]mV and [Formula: see text][Formula: see text]mV, respectively. DSC and FTIR studies showed that no chemical interactions between drug and polymer Formulations showed an initial burst release, which is a reason for the good capacity of the polymer to maintain the drug in it and lead to a primary slow release.
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