Description

L-Cystine Hydrochloride is the hydrochloride salt form of the essential sulfur-containing amino acid L-Cystine. This compound is a critical building block in the synthesis of peptides and proteins, valued for its role in stabilizing protein structures through disulfide bonds. It is primarily utilized by manufacturers in the pharmaceutical, nutraceutical, and food and beverage industries for applications ranging from parenteral nutrition to dietary supplements.

Application

• Pharmaceutical Intermediates: Used as a key raw material in the synthesis of active pharmaceutical ingredients (APIs) and peptide-based drugs.
• Parenteral Nutrition: An essential component in amino acid infusion solutions for clinical nutrition and critical care.
• Dietary Supplements & Nutraceuticals: Incorporated into formulations aimed at supporting hair, skin, nail health, and antioxidant defense.
• Food & Beverage Fortification: Used as a nutritional enhancer in specialized foods, medical nutrition products, and protein blends.
• Biochemical Research: Serves as a standard and reagent in cell culture media and various life science research applications.
• Cosmetic Ingredients: Found in hair care and skincare products for its purported strengthening and protective properties.

Basic Information

Product Name	L-Cystine Hydrochloride
CAS No.	34760-60-6
Molecular Formula	C6H12N2O4S2 • 2HCl
Molecular Weight	313.22 g/mol
Synonyms	L-Cystine Dihydrochloride; (R,R)-3,3'-Dithiobis(2-aminopropanoic acid) dihydrochloride; Cystine Hydrochloride; Cystine Dihydrochloride; L-(-)-Cystine Dihydrochloride; Dicysteine Hydrochloride; (2R,2'R)-3,3'-Disulfanediylbis(2-aminopropanoic acid) dihydrochloride
EINECS	Contact for details

Quality Control

Our L-Cystine Hydrochloride is manufactured under strict quality management systems. We offer grades suitable for demanding applications, with quality assurance protocols that may align with compendial standards such as USP and EP where applicable. Every batch is supported by a comprehensive Certificate of Analysis (COA) to ensure traceability and compliance with your specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature. This product is hygroscopic (moisture-sensitive) and must be kept under conditions that minimize exposure to atmospheric humidity to prevent caking or degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	98.0% - 102.0%
Specific Rotation	-215° to -225°
pH (1% Solution)	1.5 - 2.5
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.