D-Cystine Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 349-46-2 |
| Product name | D-Cystine |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Industrial GradeSpecialty GradeFood GradeCosmetic Grade |
| Packaging | 25KG/bag500KG/bag1000KG/bag |
| Sample | Test Samples Available (Click to Request Samples) |
| COA | View COA |
| Price | Get Quote |
| Supply Type | Bulk / Contract manufacturing / OEM |
| Shipping | FCL / LCL available |
| Payment Terms | Support FOB \ CIF \ EXW quotations, and accept Letter of Credit (L/C). |
| Manufacturer | Greenrock Chemical(China Factory) |
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Documents We Provide for D-Cystine
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk D-Cystine Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of D-Cystine
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Used in the synthesis of antibiotics and pharmaceuticals | Serves as a raw material in organic synthesis reactions |
| Food | Used as a nutritional supplement | Added to food products to supplement sulfur-containing amino acids |
| Cosmetics | Used in antioxidant and moisturizing formulations | Incorporated into formulations as a stabilizer or skin-conditioning agent |
| Animal Feed | Used as a feed additive | Applied to improve animal protein metabolism and coat quality |
| Chemicals | Used in the production of other sulfur-containing compounds | Participates in condensation, oxidation, and other chemical reactions |
Manufacturing Quality Control of D-Cystine
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (D-Cystine Content) | Acid-Base Titration with NaOH | Quantifies carboxylic acid groups via potentiometric or indicator-based titration after dissolution in NaOH solution. |
| Specific Optical Rotation | [α]D | Measures rotation of plane-polarized light at 589 nm to confirm chiral purity and identity of D-enantiomer. |
| Heavy Metals (as Pb) | Colorimetric Limit Test (Thiourea/Sulfide Method) | Compares sample color intensity against lead standard after sulfide precipitation under controlled pH. |
| Loss on Drying (LOD) | Gravimetric Method (105 °C, 2 h) | Determines volatile content by mass loss upon drying under standardized temperature and time. |
| Residue on Ignition | Gravimetric Ash Residue Method | Measures inorganic impurities remaining after controlled high-temperature incineration (~600–700 °C). |
| Chloride Impurity | Argentometric Titration (Mohr Method) | Quantifies chloride ions by precipitation titration with AgNO₃ using K₂CrO₄ indicator. |
| Sulfate Impurity | Barium Sulfate Turbidimetry | Measures sulfate as BaSO₄ precipitate formed in acidic medium; quantified by turbidity comparison. |
| Related Substances (Impurity Profile) | Reverse-Phase HPLC with UV Detection | Separates and quantifies structurally related impurities (e.g., L-cystine, cysteine, cystine disulfide variants) using C18 column and UV detection at 210 nm. |
| Water Content | Karl Fischer Coulometric Titration | Electrochemically determines trace water via iodine generation and stoichiometric reaction with water in anhydrous methanol. |
| pH of Aqueous Solution (1% w/v) | Potentiometric pH Measurement | Measures hydrogen ion activity in aqueous suspension using calibrated glass electrode and pH meter. |
| Microbial Limits | Membrane Filtration / Plate Count Method | Quantifies aerobic microorganisms (CFU/g) and detects specified pathogens per pharmacopoeial microbiological testing guidelines. |
| Particle Size Distribution | Laser Diffraction Analysis | Determines size distribution of solid particles in dry powder form using Mie scattering theory. |
| Iron (Fe) Content | ICP-OES | Quantifies trace iron after acid digestion by measuring characteristic atomic emission lines (e.g., 238.204 nm). |
Technical Specifications of D-Cystine
| Test Item | Specification |
|---|---|
| Appearance | White crystalline solid |
| Purity | >=98.0% |
| Water Content (KF) | <=0.5% |
| Melting Point | 240-245°C (decomposes) |
| Optical Rotation | [α]20/D +205° to +215° (c=1 in 0.1N HCl) |
| Total Impurities | <=2.0% |
| Heavy Metals | <=10 ppm |
| Residue on Ignition | <=0.1% |
| Odor | Characteristic, slight sulfurous odor |
Specifications vary by industry. Reach out to our technical experts for a COA tailored specifically to your application. Email:selse@GRchemical.com
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Download COA of D-Cystine
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of D-Cystine
Packaging of D-Cystine
Industrial D-Cystine Procurement FAQ
1. How do you ensure product quality consistency?
We rely on a mature China-based manufacturing system and implement strict batch control and quality inspection for every shipment. Our production process complies with ISO 9001 standards, and a COA is provided for each batch to ensure consistent and reliable quality.
2. Do you offer competitive pricing for bulk orders?
Yes, as a China-based manufacturer and bulk supplier, we provide tiered pricing based on order volume. We support FOB and CIF quotations, as well as L/C payment terms for large transactions to meet international trade requirements.
3. Can you support large-volume or long-term supply?
We have stable production capacity and a well-established supply chain, enabling continuous bulk supply. We support ton-level and container-level orders, as well as long-term cooperation projects.
4. What is your typical lead time?
For in-stock products, shipment can be arranged within 1–3 days. For bulk packaging or customized orders, lead time depends on the specific quantity and production schedule.
5. What documents do you provide?
We can provide complete documentation upon request, including COA, SDS, TDS, and other compliance certificates, meeting industrial procurement and export requirements.
6. Can you customize product specifications or packaging?
Yes, we support customization of parameters such as purity, impurities, residual solvents, and heavy metals. We also offer various bulk packaging options, including 25kg bags, drums, and IBC tanks, suitable for industrial applications and transportation.
7. What shipping options do you support?
We support both FCL (Full Container Load) and LCL (Less than Container Load) shipments, and can flexibly arrange logistics solutions based on order size to meet bulk chemical export needs.
8. Do you provide technical or application support?
Yes, we provide basic application guidance and technical support based on industry experience to help customers optimize product usage.
9. How do you handle compliance and export regulations?
We are familiar with international trade and export regulations, ensuring all products comply with relevant requirements. We also provide complete documentation to support smooth customs clearance and global delivery.
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