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Chemically selective liposomal surface functionalization and liposomal microarray fabrication using azide-reactive liposomes are described. First, liposome carrying PEG-triphenylphosphine was prepared for Staudinger ligation with azide-containing biotin, which was conducted in PBS buffer (pH 7.4) at room temperature without a catalyst. Then, immobilization and microarray fabrication of the biotinylated liposome onto a streptavidin-modified glass slide via the specific streptavidin/biotin interaction were investigated by comparing with directly formed biotin-liposome, which was prepared by the conventional liposome formulation of lipid-biotin with all other lipid components. Next, the covalent microarray fabrication of liposome carrying triphenylphosphine onto an azide-modified glass slide and its further glyco-modification with azide-containing carbohydrate were demonstrated for glyco-liposomal microarray fabrication via Staudinger ligation. Fluorescence imaging confirmed the successful immobilization and protein binding of the intact immobilized liposomes and arrayed glyco-liposomes. The azide-reactive liposome provides a facile strategy for membrane-mimetic glyco-array fabrication, which may find important biological and biomedical applications such as studying carbohydrate-protein interactions and toxin and antibody screening.

Azide-Reactive Liposome for Chemoselective and Biocompatible Liposomal Surface Functionalization and Glyco-Liposomal Microarray Fabrication