Sulfo-Cyanine 5.5 NHS ester [equivalent to Cy5.5(R) NHS ester]

Sulfo-Cyanine5.5 NHS ester is an amine-reactive activated ester of the sulfonated far-red Cyanine5.5 fluorophore, serving as an analog of Cy5.5(R). It is the preferred reagent for labeling antibodies, sensitive proteins, and other biomolecules that require reactions in purely aqueous environments or with minimal use of organic co-solvents. This dye is highly suitable for non-invasive in vivo near-infrared (NIR) imaging and applications where low fluorescent background is essential. Chemical Properties Storage Upon receipt, store at -20°C in the dark. Protect from light and moisture. When stored as indicated, Sulfo-Cyanine 5.5 NHS ester is stable for at least 1 year. This product is for Research Use Only· Not for Human or Veterinary or Therapeutic Use CAS number 910482-46-1 Formula C63H92N6O16S4 Molecular Weight 1317.70 HPLC Purity >95% lambdaabs (nm) 683 epsilonmax (M-1 cm-1) 2.5x10^5 lambdafl (nm) 703 CF260 =epsilon260/epsilonmax NA CF280 =epsilon280/epsilonmax