DL-Cystine Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 923-32-0 |
| Product name | DL-Cystine |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Agricultural GradeIndustrial 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 DL-Cystine
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk DL-Cystine Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of DL-Cystine
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Raw material for amino acid-based drugs; nutritional supplement | Used in the synthesis of sulfur-containing amino acid drugs or as a component of intravenous compound amino acid formulations |
| Food | Nutritional fortifier; antioxidant | Incorporated into food products to supplement essential amino acids and enhance protein nutritional value |
| Cosmetics | Hair-care ingredient; skin-conditioning agent | Formulated into shampoos and conditioners to support hair growth and repair damaged hair |
| Chemicals | Organic synthesis intermediate | Participates in peptide synthesis and sulfur-containing compound synthesis reactions |
| Animal Feed | Animal nutrition additive | Added to animal feed to improve coat/fur quality and growth performance in livestock and poultry |
Manufacturing Quality Control of DL-Cystine
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (DL-Cystine Content) | Acid-Base Titration with NaOH | Quantifies cystine by titrating carboxylic acid groups after dissolution in NaOH and back-titration with HCl. |
| Heavy Metals (as Pb) | Atomic Absorption Spectroscopy (AAS) | Measures total heavy metal content by atomizing sample and detecting absorbance of characteristic wavelengths. |
| Loss on Drying | Gravimetric Method | Determines volatile content by measuring mass loss after drying at 105 C for 2 hours. |
| Residue on Ignition | Gravimetric Method | Quantifies inorganic ash content by weighing residue after ignition at 600 C. |
| Chloride Impurity | Potentiometric Titration with AgNO3 | Detects chloride ions via precipitation titration using silver nitrate and silver indicator electrode. |
| Sulfate Impurity | Turbidimetric Method with BaCl2 | Measures sulfate as barium sulfate precipitate formation, quantified by light scattering. |
| Specific Optical Rotation | Polarimetry | Determines enantiomeric composition by measuring rotation of plane-polarized light in solution. |
| pH of Aqueous Solution | pH Meter Measurement | Measures hydrogen ion activity in a 1% w/v aqueous suspension at 25 C. |
| Related Substances | High-Performance Liquid Chromatography (HPLC) | Separates and quantifies impurities (e.g., cysteine, cystine dimers) using reversed-phase C18 column and UV detection. |
| Iron (Fe) Content | ICP-OES | Quantifies iron by plasma excitation and emission intensity measurement at characteristic wavelength. |
| Arsenic (As) Content | Hydride Generation AAS (HG-AAS) | Converts arsenic to arsine gas, then measures atomic absorption after quartz cell atomization. |
| Microbial Limits | Membrane Filtration and Plate Count | Detects aerobic microorganisms and absence of specified pathogens by filtration, incubation, and colony enumeration. |
Technical Specifications of DL-Cystine
| Test Item | Specification |
|---|---|
| Appearance | White crystalline solid |
| Purity | >=98.5% (by NMR) |
| Water Content (KF) | <=0.5% |
| Melting Point | 240-245°C (decomposes) |
| Total Impurities | <=1.5% |
| Single Impurity | <=0.5% |
| Heavy Metals | <=20 ppm |
| Residue on Ignition | <=0.1% |
| Optical Rotation | +/- 0.5° (c=1 in 1M HCl) |
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 DL-Cystine
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of DL-Cystine
Packaging of DL-Cystine
Industrial DL-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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