Sigma-Aldrich L-Proline For Biochemistry

for biochemistry

L-Proline for biochemistry. CAS 147-85-3, pH 5 - 7 (100 g/L, H₂O, 20 °C).

Assay (perchloric acid titration, calculated on dried substance)≥ 99.0 %Identity (IR-spectrum)passes testAppearancewhite or almost white, crystalline powder or colorless crystalsAppearance of solution (50 g/L; water)clear and colorlessSpec. rotation (α 20/D, 40 g/L, water, calc. on dried substance) -84.0 bis -86.0Chloride (Cl)≤ 0.02 %Sulfate (SO₄)≤ 0.03 %Heavy metals (as Pb)≤ 0.001 %Ninhydrin-positive substances (LC)(any ninhydrin-positive impurity)≤ 0.2 %Ninhydrin-positive substances (LC) (ammonium (570 nm))≤ 0.02 %Ninhydrin-positive substances (LC)(total impurities)≤ 0.5 %Loss on Drying (105 °C)≤ 0.4 %