L-Cystine
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
HOOC(NH2)CHCH2S-SCH2CH(NH2)COOH 240.30 CAS RN®: 56-89-3.
1 SPECIFIC ROTATION (781)
Sample solution: 20 mg/mL of L-Cystine, previously dried over silica gel for 4 h
Temperature: 20°
Acceptance criteria: -215° to -225°
2 LOSS ON DRYING (731)
Analysis: Dry over silica gel for 4 h.
Acceptance criteria: NMT 0.2%
3 RESIDUE ON IGNITION (Reagent test)
NMT 0.1%
