Stimulated by the achievements of the first phase in genomics and the resulting need of assigning functions to the acquired sequence information, novel formats of immunoassays are being developed for high-throughput multi-analyte studies. In principle, they are similar in nature to the microarray assays already established at the level of nucleic acids. However, the biochemical diversity and the sheer number of proteins are such that an equivalent analysis is much more complex and thus difficult to accomplish. The wide range of protein concentration complicates matters further. Performing microarray immunoassays already represents a challenge at the level of preparing a working chip surface. Arrays have been produced on filter supports, in microtiter plate wells and on glass slides, the last two usually coated with one-, two- or three-dimensionally structured surface modifications. The usefulness and suitability of all these support media for the construction and application of antibody microarrays are reviewed in this manuscript in terms of the different kinds of immunoassay and the various detection procedures. Additionally, the employment of microarrays containing alternative sensor molecules is discussed in this context. Th...Continue Reading
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