4-methylumbelliferone-β-D-lactoside (250 mg)

Synonyms: 4-Methylumbelliferyl β-D-lactopyranoside, 4-Methylumbelliferyl β-D-lactoside, 4-METHYLUMBELLIFERYL-BETA-D-LACTOSIDE, 4-Methylumbelliferyl b-D-lactoside
CAS Number: 84325-23-5
Molecular Formula: C₂₂H₂₈O₁₃
Molecular Weight: 500.45 g/mol

Used as a colorimetric glycan acceptor for sialyltransferases with absorbance ranging from 280-315 nm. The product can also be used as a fluorogenic probe of β-lactosidase or combined galactosidase and glucosidase activities. Upon cleaving the sugar, the substrate releases the blue fluorophore 4-methylumbelliferone (4-MU) in direct correlation to the β-lactosidase enzyme activity contained in the sample (Ex: 385 nm, Em: 502 nm, ε = 16K).