After a month of technical research, ChinaPeptides R&D department developed another fluorescent dye (Rose Bengal, Sigma Cat No. R3877 Qty 5 g) marked peptide. Rose Bengal is a water-soluble fluorescent. In water, its excitation wavelength (excitation spectra, nm) is λmax (ex) = 548 nm, emission wavelength (emission, nm) is λmax (em) = 567 nm. It’s with a benzene ring and extremely inert, so the Rose Bengal is very difficult to be modified. The project is the subject of Beijing Normal University, so ChinaPeptides has won praise by this success again. Up to now, we have developed more than twenty kinds of fluorescent marked peptides, became the 's and more comprehensive types of fluorescent-labeled peptide manufacture.