Isotope labelled 4-Methylumbelliferone (M333002), the standard for the fluorometric determination of enzyme activity. Highly fluorescent in alkaline solution.Fluorescence: max Abs. l = 360nm, max. Em. l = 449nm; pH > 9Melting Point: 190-192°CSolubility:Methanol Stability: Light Sensitive - Protect from LightStorage and Stability:May be stored at RT for short-term only. Long-term storage is recommended at -20°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap.