N-acetyl-d-glucosamine Description: white to light yellow powder or flake Specific optical rotation: ·+39.0fp-·+43.0fp Arsenic : f_1ppm Iron: f_10ppm Heavy metal: f_10ppm Residue on ignition:f_0.5% Loss on drying f_0.50% Assay :fª99.00% Chloride: f_1.0% Melting point : 196.0-205.0f¦