L-Pyroglutamic Acid

Description: White crystalline powder 
Assay: 99.0% to 101.0% 
Specific rotation (a) 20/D (C=2, H2O): -11 to -12 Degree 
Transmittance: Not less than 98.0% 
Melting point: 158.0 ℃ to 161.0 ℃ 
Chloride (Cl): NMT 0.02% 
Ammonium (NH4): NMT 0.02% 
Sulfate (SO4): NMT 0.02% 
Heavy metals (as Pb): NMT 10 ppm 
Iron (Fe): NMT 10 ppm 
Arsenic (As2O3): NMT 1 ppm 
Loss on drying: NMT 0.50% 
Residue on ignition: NMT 0.1%