Fluororeactands for the detection of saccharides based on hemicyanine dyes with a boronic acid receptor

Three hemicyanine dyes with boronic acid receptor functions have been synthesized in a two step procedure. These dyes are capable of forming a covalent bond between their boronic acid moiety and the diol moiety of saccharides which causes fluorescence to change. In detail, the indicator dyes exhibit absorbance maxima at around 460mm and emission at around 600mm, show increases in fluorescence upon exposure to saccharides and can be used in aqueous solution at physiological pH.