Description

D-Cystine is the D-isomer of the sulfur-containing amino acid cystine, a key building block in peptide synthesis and biochemical research. This high-purity chiral compound is essential for applications requiring specific stereochemistry, such as the development of novel pharmaceuticals and bioactive peptides. It is primarily utilized by research institutions, pharmaceutical development labs, and fine chemical manufacturers focused on advanced synthesis and metabolic studies.

Application

• Pharmaceutical Intermediate: Critical starting material or chiral building block in the synthesis of specialized peptides, prodrugs, and active pharmaceutical ingredients (APIs).
• Biochemical Research: Used in metabolic pathway studies, enzyme-substrate interaction research, and as a standard in analytical chromatography.
• Nutritional Science: Employed in studies investigating the role of D-amino acids in metabolism and their potential biological effects.
• Cosmetic & Personal Care: Incorporated into high-end formulations for hair care and skin conditioning products, leveraging its sulfur content.
• Food & Beverage Analysis: Serves as a reference standard in quality control labs for amino acid analysis in food products and supplements.

Basic Information

Product Name	D-Cystine
CAS No.	349-46-2
Molecular Formula	C6H12N2O4S2
Molecular Weight	240.30 g/mol
Synonyms	(R,R)-3,3'-Dithiobis(2-aminopropanoic acid); D-3,3'-Dithiobis(2-aminopropanoic acid); (R,R)-Cystine; D-Dicysteine; D-α,α'-Diamino-β,β'-dithiodipropionic acid; (2R,2'R)-3,3'-Disulfanediylbis(2-aminopropanoic acid)
EINECS	206-496-9

Quality Control

Our D-Cystine is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards suitable for research and pharmaceutical applications. A comprehensive Certificate of Analysis (COA) detailing purity, chiral purity, and impurity profiles is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect stability and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.5%
Chiral Purity (HPLC)	≥ 99.0% D-isomer
Specific Rotation	+ / - [α]20/D (Contact for specific value)
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.