L-Cystine dihydrochloride

• 

1. Stability Under Normal Storage Conditions

• Solid state:
  Stable at room temperature, dry, sealed, and protected from light.
  No obvious discoloration, decomposition, or crystal change for at least 2–3 years.
• Slightly hygroscopic:
  Absorbs moisture slowly under high humidity but does not rapidly decompose.
• Optical stability:
  Stable in acidic solution; no racemization under normal conditions.

2. Thermal Stability

• Melting point behavior:
  Does not melt cleanly; decomposes at approximately 180–220 °C.
• Heating in solution:
  Stable at < 60 °C in acidic conditions.
  At > 80 °C, slow decomposition may occur, releasing trace H₂S, NH₃, CO₂.
• High-temperature sterilization:
  Relatively stable in autoclaving (121 °C, 15–20 min) in acidic media,
  but partial degradation may occur in neutral/alkaline solutions.

3. pH Stability

• Strongly acidic (pH 1–3):
  Highly stable; disulfide bonds and molecular structure remain intact.
• Neutral conditions (pH 5–8):
  Begins to precipitate as free L‑cystine (low solubility),
  but no chemical decomposition.
• Alkaline conditions (pH > 9):
  Unstable. Disulfide bonds cleave easily; sulfur is lost as H₂S;
  racemization and oxidative degradation accelerate.

4. Oxidation Stability

• Stable to weak oxidants (air oxygen, dilute H₂O₂ at low concentration).
• Strong oxidants (concentrated H₂O₂, KMnO₄, hypochlorite, concentrated HNO₃)
  cause rapid oxidation of the disulfide bond, forming sulfinic/sulfonic acids and degradation products.
• In neutral/alkaline environments, oxidation is significantly accelerated.

5. Reduction Stability

• Disulfide bonds are easily reduced to cysteine by common reducing agents:
  DTT, β‑mercaptoethanol, NaBH₄, thioglycolate, Zn/H⁺, etc.
• Reduction is rapid in both acidic and neutral conditions.

6. Light Stability

• Light-sensitive to some extent:
  Prolonged exposure to sunlight or UV light causes slow discoloration (yellowing)
  and mild decomposition.
• Should be stored protected from light.

7. Stability in Aqueous Solution

• Acidic solution: Stable for days at 4 °C; stable for hours at room temperature.
• Neutral aqueous solution:
  Precipitates gradually as free L‑cystine;
  simultaneously undergoes slow oxidation.
• Not suitable for long‑term storage in neutral solution.

8. Compatibility Stability

• Stable with acids, neutral salts, sugars, amino acids in acidic media.
• Incompatible with:
  • Strong oxidizing agents
  • Strong bases
  • Heavy metal ions (Ag⁺, Hg²⁺, Pb²⁺, Cu²⁺)
    → form precipitates or catalyze decomposition

Summary

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