Abstract
The conversion of drugs into drug nanoparticles (nano-drugs) represents a feasible method to enhance bioavailability of otherwise sparingly soluble-drugs. Nano-drugs enhance bioavailability through the improvement of dissolution rate and saturation solubility of drugs, by virtue of their small sizes. Nano-drugs available in the market are usually produced by top-down methods, such as wet milling and high pressure homogenization. These conventional top-down methods, however, suffer from high energy and time requirement, as well as wide and inconsistent nano-drug size distribution. Furthermore, commercially available nano-drugs are predominantly crystalline while amorphous nano-drugs are largely neglected despite their propensity to generate high saturation solubility. In this review, nonconventional methods to prepare crystalline and amorphous nano-drugs are discussed, with the bioavailability enhancing characteristics highlighted. Both top-down and bottom-up methods are covered, finally, a sustainability-based perspective comparing amorphous and crystalline nano-drugs is presented.
Keywords: Nanoparticle, nano-crystals, amorphous drug nanoparticles, bioavailability enhancement, top-down, bottom-up.
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