C6H13NO2 M.W. 131.18 100 gm Assay(HClO4 titration) min 99.0%  Specific rotation(d)20D (C=4 in 6M HCl calc. on anhydrous substance ) +14.9 o to + 16.50o pH of 1% solution 5.5-7.0 Appearance of solution passes test Insoluble matter in HCl 1 mol/lpasses test Loss on drying at 105o C max 0.2% Residue on ignition (as SO4 ) max 0.1% Chloride (Cl) max 0.02% Sulphate (SO4 ) max 0.03% Iron (Fe) max 0.001% Heavy metals(as Pb) max 0.001% Ammonium(NH4) max 0.02% Foreign amino acids max 0.3% Other ninhydrin-positive substances(as glycine) max 0.1%