Anion binding to a cationic europium(iii) probe enables the first real-time assay of heparan sulfotransferase activity

open access articleWe present a new luminescent europium(iii)-based anion receptor that binds to PAP (adenosine-3′,5′-diphosphate). The increased emission intensity and lifetime of the receptor-PAP complex was used to develop the first real-time assay of heparan sulfotransferase activity