From their discovery half a century ago and the subsequent appreciation of
their clinical utility, liposomes currently hold a recognized position in the mainstream
of drug delivery systems. Conventional techniques for liposome preparation and size
reduction are simple to implement and do not require sophisticated equipment. However,
most of them are not easy to scale-up for industrial liposome production. With
several liposomal formulations already on the market, and more in final clinical trials,
the industrial scale production of liposomes has become reality, and so the range of liposome preparation methods has
been extended by a number of techniques which are increasingly attractive, such as microfluidic hydrodynamic focusing,
supercritical fluid processing, freeze-drying and spray-drying. Some of these new techniques generally represent advancements
of the conventional methods allowing for scale-up, better reproducibility and process control. This review
summarizes patents in the last decade offering new techniques for production of liposomes as related to their application
in drug delivery.
Keywords: Drug delivery, liposome, vesicle, lipid, microfluidic, supercritical fluid, nanoparticle.
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