UGO 680 NHS ester [equivalent to ATTO 680 NHS ester]

UGO 680 is a far-red fluorescent dye known for its strong absorption, high photo and thermal stability, and excellent aqueous solubility. It is optimally excited within the 645-695 nm wavelength range, making it compatible with the 670 nm line of diode lasers and the 676 nm line of Krypton-Ion lasers. As a zwitterionic compound, UGO 680 remains electrically neutral when conjugated to biomolecules or other substrates. Its strong electron-accepting properties enable efficient fluorescence quenching by electron donors such as guanine and tryptophan. These characteristics make UGO 680 highly suitable for precision applications, including single-molecule detection and super-resolution microscopy techniques like PALM, dSTORM, and STED. Additionally, UGO 680 is compatible with flow cytometry (FACS), fluorescence in situ hybridization (FISH), and a wide range of other biological assays, establishing it as a versatile and indispensable tool in advanced fluorescence-based research. Chemical Properties Storage Upon receipt, store at -20°C in the dark. Protect from light and moisture. When stored as indicated, UGO NHS-esters are stable for at least 3 years. This product is for Research Use Only· Not for Human or Veterinary or Therapeutic Use CAS number 1537182-26-5 Formula C31H34N4O8S Molecular Weight (M+) 623 HPLC Purity >95% lambdaabs (nm) 681 epsilonmax (M-1 cm-1) 1.25x10^5 lambdafl (nm) 698 etafl 30% taufl (ns) 1.7 CF260 =epsilon260/epsilonmax 0.30 CF280 =epsilon280/epsilonmax 0.17