SY-21 azide is (QSY®-21 equivalent) is a non-fluorescent acceptor dye with a broad and intense quenching range from 580 nm to 680 nm making it useful as a fluorescence resonance energy transfer (FRET) Acceptor in applications and used in conjunction with fluorescent dyes from 580 nm to 680 nm, which are commonly used to prepare peptide and oligonucleotide FRET probes. Examples include Fluorescein, Alexa Fluor® 568, 594, 633, 647, TAMRA, ROX, Texas Red, and Cy5. QSY®-21 is a registered trademark of ThermoFisher Scientific.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.
