Dextran is labeled with rhodamine, Ex/Em wavelength 552/575 nm. The rhodamine used in all of polysaccharide products is 5/6-carboxy-tetramethyl-rhodamine, (5/6-TAMRA). Purity: >95% powder. Degree of substitution: 1 mol % substitution and at least one dye molecule per polymer. Dextran labeled with other types of rhodamine dyes such as Texas Red, Sulforhodamine 101 may be offered through our custom synthesis.