Covalent immobilization of carbohydrates on sol–gel-coated microplates

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Abstract

Carbohydrate microarrays have attracted increasing attention in recent years because of their ability to monitor biologically important protein-carbohydrate interactions in a high-throughput manner. Here we have developed an effective approach to immobilizing intact carbohydrates directly on polystyrene microtiter plates coated with amine-functionalized sol-gel monolayers. Lectin binding was monitored by fluorescence spectroscopy using these covalent arrays of carbohydrates that contained six mono- and di-saccharides on the microplates. In addition, binding affinities of lectin to carbohydrates were also quantitatively analyzed by determining IC(50) values of lectin-specific antibody with these arrays. Our results indicate that microplate-based carbohydrate arrays can be efficiently fabricated by covalent immobilization of intact carbohydrates on sol-gel-coated microplates. The microplate-based carbohydrate arrays can be applied for screening of protein-carbohydrate interactions in a high-throughput manner.

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