Wholesale L-Cystine dihydrochloride

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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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