APIs and Excipients

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Mannitol is the most commonly used bulking agent in freeze-drying formulation design. The benefit of using mannitol is that it crystallizes during freezing and permits drying processes at higher product temperatures, and thus with higher sublimation rates relative to purely amorphous systems (1). Mannitol, however, is known to form different crystalline modifications which compromises reproducibility of product characteristics and storage stability due to phase transformations (2, 3).

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The permeation of drugs through the skin is compromised by the presence of polar functional groups such as thiols, alcohols, phenols, imides or amides. By transiently masking these polar functional groups as prodrugs the permeability of drugs containing these functional groups through the skin can be improved.

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Polysaccharide-based chiral stationary phases have been developed that comprise chiral selectors immobilized on their support rather than being physically coated. These materials are completely solvent stable, thereby increasing selectivity and and enabling the development of new chiral selectors that have been too unstable in a coated form for general use.

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The combination of supercritical fluid chromatography with chiral separation media offers several analytival advantages over traditional liquid chromatography techniques.

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Ultrahigh pressure liquid chromatography maximizes efficiency, but, as defined by the resolution equation, the stationary phase is still a crucial consideration when attempting to resolve mixtures of compounds.