Sulfo-Cyanine5.5, a water-soluble far-red fluorophore analogous to Cy5.5®, is recognized for its bright fluorescence due to its high molar extinction coefficient. Its four sulfo groups confer hydrophilicity and negative charge, reducing non-specific binding. Its tetrazine moiety facilitates stable conjugate formation with trans-cyclooctenes, cyclopropenes, and certain strained cyclooctynes via inverted electron demand [4+2]-cycloaddition (IEDDA). Ideal for labeling biomolecules, it displays high water solubility and hydrophilicity.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.
