L-Isoleucine

Molecular Formula: C6H13NO2

Molecular Weight: 131.17

CAS No： 73-32-5

L-Isoleucine CP2020 EP11 USP2023
Assay ≥98.5% 98.5-101.0% 98.5-101.5%
PH 5.5-6.5 / 5.5-7.0
Specific rotation[a]D20 +38.9°-+41.8° +40.0-+43.0 /
Specific rotation[a]D25 / / +38.9°-+41.8°
Transmittance(T430) ≥98.0% / /
Appearance of solution / clear & colorless ≤BY6 /
Chloride(Cl) ≤0.02% ≤0.02% ≤0.05%
Ammonium(NH4) ≤0.02% ≤0.02% /
Sulfate(SO4) ≤0.02% ≤0.03% ≤0.03%
Iron(Fe) ≤10PPM ≤10PPM ≤30PPM
Heavy metals(Pb) ≤10PPM / /
Arsenic ≤1PPM / /
Other amino acids ≤0.5% / individual impurities≤0.5%  
total impurities≤2.0%
Ninhydrin-positive substances / Impurities A and C at 570 nm≤ 0.3%
each impruity ≤0.2%
total ≤1.0%		 /
Loss on drying ≤0.20% ≤0.5% ≤0.30%
Residue on ignition ≤0.10% ≤0.10% ≤0.30%
Endotoxin ＜20EU/g ＜20EU/g ＜20EU/g
Total plate count ≤ 500 CFU/g ≤ 500 CFU/g ≤ 500 CFU/g
Moulds & Yeasts ≤ 50 CFU/g ≤ 50 CFU/g ≤ 50 CFU/g