L-Cystine dihydrochloride
L‑Cystine dihydrochloride = (L‑cystine)·2HCl
1. Basic Identification
- Molecular formula: C₆H₁₂N₂O₄S₂ · 2HCl
- Molecular weight: 313.22 g/mol
- CAS number: 30925‑07‑6
2. Appearance & Physical Form
- Appearance: White to off‑white crystalline powder
- Odor: Odorless or slight characteristic odor
- Taste: Slightly acidic
3. Solubility
- Freely soluble in dilute hydrochloric acid (0.1–1 M HCl)
- Sparingly soluble in water
- Practically insoluble in ethanol, methanol, acetone, ether, and other organic solvents
4. Melting Point & Decomposition
- Melts with decomposition at approximately 180–220 °C
(actual value depends on heating rate and purity)
5. Optical Activity
- Specific rotation:
[α]D20≈+225°∼+240°
(measured in 1 M HCl, c ≈ 1–2%)
- Typical value reported: ≈ +230°
6. pH Value
- Aqueous solution (suspension): strongly acidic
- 1% aqueous dispersion: pH ≈ 1.0–2.0
7. Other Physical Properties
- Hygroscopicity: Slightly hygroscopic under high humidity
- Crystal structure: Crystalline powder (usually needle‑like or granular crystals)
- Stability: Stable under normal conditions; avoid strong bases, heat, and oxidizing agents
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