Tetrazines demonstrate exceptionally fast cycloaddition kinetics (up to 30 000 M-1 s-1) with trans-cyclooctenes (TCO) as the dienophile, the fastest kinetics ever reported for any bioorthogonal reaction. In addition, inverse-Electron-Demand Diels-Alder reaction of tetrazines trans-cyclooctenea forms a stable covalent bond and does not require Cu-catalyst or elevated temperatures.
APDye 680R is a bright and photostable near IR dye that emits fluorescence at about 700 nm in the borderline spectral region between far-red and near-IR. APDye 680R dye is water soluble and pH-insensitive from pH 4 to pH 10. APDye 680R is a rhodamine-based dye, and like rhodamine dyes in general, it is very bright and exceptionally photostable (Figure 1). The superior photostability and excellent brightness of APDye 680R makes this dye an ideal for confocal microscopy, single molecule imaging and other applications that demand both brightness and photostability.
APDye 660R dye spectrally is almost identical to CF® 680R Dye and can be used a less expensive alternative to these dyes.
CF® Dye is a registered trademark of Biotium.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.
