4-Methylumbelliferyl-N-acetyl-α-D-Neuraminic Acid (sodium salt)

4-Methylumbelliferyl-N-acetyl-α-D-Neuraminic Acid (sodium salt) (CAS No.: 76204-02-9) is a fluorogenic substrate widely employed in biomedical research for the sensitive and quantitative assessment of neuraminidase activity, particularly in the context of viral enzymes such as influenza neuraminidase and endogenous sialidases. Functioning as a synthetic analog of natural neuraminidase substrates, it undergoes enzymatic hydrolysis to release the fluorescent product 4-methylumbelliferone, enabling precise measurement of enzyme activity through fluorescence-based detection systems. This compound is primarily utilized in enzymology and antiviral research, where it serves as a key tool for investigating neuraminidase-mediated cleavage processes, screening and characterizing neuraminidase inhibitors, and elucidating mechanisms of viral infection and host-pathogen interactions. The fluorescence signal generated is pH-dependent, allowing adaptable assay conditions across different experimental systems, and supports high-throughput screening formats. In vitro applications commonly include assays in mammalian cell lysates, purified enzyme systems, and clinical viral isolates, with effective use typically observed across low micromolar to micromolar substrate concentrations depending on assay design. Its robust sensitivity and selectivity make it an essential reagent in drug discovery programs targeting neuraminidase-related pathways, as well as in broader studies of glycobiology and sialic acid metabolism.