L-lysine monohydrochloride

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1. Assay (content): ≥98.5% (acid-base titration method).
2. Specific rotation: +20.3° to +21.5° (10% w/v aqueous solution, 25 °C).
3. Loss on drying: ≤0.5% (105 °C, 3 h)— no water of crystallization.
4. Residue on ignition: ≤0.1%— low inorganic impurity content.
5. Chloride content: 19.0–19.8% (titration with AgNO3)— confirms the hydrochloride salt stoichiometry.
6. Heavy metals: ≤10 ppm (Pb²⁺ as reference)— meets food/ pharmaceutical safety standards.
7. Arsenic: ≤1 ppm— ultra-low toxic impurity content.
8. pH: 5.0–6.0 (10% w/v aqueous solution)— near neutral, no irritation to gastrointestinal tract.

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