Adsorption of proteins on solid surfaces and their interaction are major concerns in a number of fields such as biology, medicine, biotechnology and food processing, and play an important role from various points of view. Based on practical viewpoints, information on the conformation of the adsorbed protein as well as adsorption characteristics is essential for a system's performance. Although there are still many problems to be solved, extensive studies in recent years, owing to the development in instrumentation and instrumental techniques, reveal the adsorption behavior of proteins in detail. Here, we stress the importance and interesting aspect of protein adsorption on solid surfaces by reviewing findings that have been obtained in recent years.

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Proteome analysis plays a key role in the elucidation of the functions and applications for numerous proteins. For proteome analyses, various microplate-and microarray-based techniques have been developed by a number of researchers. Their intent was to immobilize proteins on the surface of a solid substrate in a site-directed manner while retaining structure and native biological function. In this review, we focus on recent advances in immobilization methodology for proteins/enzymes on a surface, including those using the affinity peptides screened by random peptide library systems. We also discuss applications of the affinity peptide-mediated immobilization method in fields related to proteome analysis, particularly our recent work concerning immunoassay and protein-protein interaction analysis.