Chitosan 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. Standard Degree of substitution (DoS): 1 mol % substitution and at least one dye molecule per polymer. Chitosan labeled with other types of rhodamine dyes such as Texas Red, Sulforhodamine 101 is available through our custom synthesis.
Chitosan is produced by deacetylationÂ ofÂ chitin, which is the structuralÂ elementÂ in theÂ exoskeletonÂ ofÂ crustaceansÂ (such as crabs and shrimp) and cell walls ofÂ fungi. The degree of deacetylation (%DD) can be determined byÂ NMR spectroscopy from 60 to 100%.Chitosan products are characterized by either its MW or its viscosity.Â TheÂ aminoÂ group in chitosan has aÂ pKaÂ value of ~6.5.
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