L(-)-Proline 99+%

Specification Test Results

• Appearance:
  White Crystalline powder or crystals
• Infrared spectrum:
  Conforms
• Loss on drying:
  ≤0.3 % (105°C, 3 hrs)
• Sulfated ash:
  ≤0.1 %
• UV transmittance:
  ≥95 % (c=10, H2O, 430 nm) 1 cm cell
• pH:
  5.5 to 7 (2.5 % at 25°C)
• Specific optical rotation:
  -84.5° to -86.8° (20°C, 589 nm) (c=4, H2O)
• Titration with HClO4:
  99.0 to 101.0 %
• Chloride (Cl):
  ≤200 ppm
• Sulfate (SO4):
  ≤200 ppm
• Ammonium (NH4):
  ≤200 ppm
• Arsenic (As):
  ≤1 ppm
• Iron (Fe):
  ≤10 ppm
• Heavy metals (as Pb):
  ≤10 ppm
• Other amino acids:
  ≤0.5 % (TLC)
• Insoluble matter:
  ≤0.005 % (in water)