Fluorous-based carbohydrate microarrays.
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The success of microarrays, such as DNA chips, for biosample screening with minimal sample usage has led to a variety of technologies for assays on glass slides. Unfortunately, for small molecules, such as carbohydrates, these methods usually rely on covalent bond formation, which requires unique functional handles and multiple chemical steps. A new simpler concept in microarray formation is based on noncovalent fluorous-based interactions. A fluorous tail is designed not only to aid in saccharide purification but also to allow direct formation of carbohydrate microarrays on fluorous-derivatized glass slides for biological screening with lectins, such as concanavalin A. The noncovalent interactions in the fluorous-based array are even strong enough to withstand the detergents used in assays with the Erythrina crystagalli lectin. Additionally, the utility of benzyl carbonate protecting groups on fucose building blocks for the formation of alpha-linkages is demonstrated.
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