Abstract
The success of a drug delivery system is often dependent on the surface properties of the device. These surface properties will determine the complex dynamic interfacial events that occur when the system is introduced into the aqueous environment of a patient. Development of the scanning probe microscopes has provided a number of very powerful new surface analytical techniques that are making a significant contribution to the characterization of drug delivery systems and the interfacial processes that occur when such systems are exposed to aqueous living environments. In this review, we describe the design and attributes of these instruments and discuss the impact of the techniques on a wide range of drug delivery research. The scanning probe microscopes are providing new insights into important problems concerning drug delivery, including the molecular structure of polymeric biomaterial surfaces, the conformation of target biomolecules, the influence of morphology on biodegradation, the adsorption of proteins to synthetic surfaces, and the structure and interactions of colloidal particles. As the whole field of scanning probe microscopy continues to advance, drug delivery research is set to benefit; in the final section of the review, the future potential derived from the ability to characterize new surface properties under aqueous conditions is discussed.
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