Chitosan is labeled with biotin through an amide bond between the amine of chitosan and the carboxylic acid of biotin. Purity: >95% lyophilized powder. Standard Degree of substitution: 1 mol % substitution and at least one biotin molecule per Chitosan polymer. DDA: degree of deacetylation; cP: centipoise.
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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