L-methionine, also known as l-methionine, is the l-handed version of methionine. Colorless or white luster flake crystal or white crystalline powder, slightly with a special smell, taste slightly bitter. Melting point 280 ~ 281℃. The instability of strong acids may lead to demethylation. Soluble in water (5.6g/100mL,30℃), lukewarm dilute ethanol, alkaline solution or dilute inorganic acid. It is insoluble in ethanol and almost insoluble in ether. Toxicity: LD50, 29mmol/kg (rats, intraperitoneal injection).

Appearance: white sheet crystal or powder

Purity: 99.93%

Package: 25 kg/drum

Content: ≥99.93%;

PH value :5.95(1% aqueous solution);

Dry weight loss: ≤0.05%;

Heavy metals (Pb) : ≤0.001%;

Light transmittance: ≥99.6%;

Burning residue: ≤0.04%;

Chloride (in Cl) : ≤0.02%;

Sulfate (SO4) : ≤0.02%;

Arsenic salt: ≤0.0001%;

Iron: 0.001% or less;

[NH4 +] : 0.02% or less;

Other amino acids: No detect