D-Cysteine Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 921-01-7 |
| Product name | D-Cysteine |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical 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-Cysteine
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk D-Cysteine Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of D-Cysteine
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Synthesis of drug intermediates | Used as a synthetic intermediate in the preparation of antibiotics, antidotes, and peptide-based drugs |
| Biochemical research | Cell culture additive | Added to cell and microbial culture media as an amino acid supplement |
| Pharmaceuticals | Antidote component | Employed as a raw material in the synthesis of antidote drugs such as acetylcysteine |
| Cosmetics | Active ingredient in skincare products | Incorporated into antioxidant formulations to mitigate free radical damage |
| Food industry | Nutritional fortifier | Added to specialized diets or nutritional supplements to provide sulfur-containing amino acids |
| Molecular biology | Protein engineering and modification | Applied in protein structural studies and disulfide bond modulation |
Manufacturing Quality Control of D-Cysteine
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (D-Cysteine Content) | Acid-Base Titration with NaOH | Quantifies free thiol and carboxylic acid groups by potentiometric titration using standardized sodium hydroxide solution. |
| Optical Rotation | [a]D Measurement using Polarimeter | Measures specific rotation at 20 C and 589 nm to confirm enantiomeric purity and identity of D-isomer. |
| Loss on Drying | Gravimetric Thermogravimetry at 105 C | Determines volatile content by weight loss after drying at specified temperature for fixed duration. |
| Residue on Ignition | Gravimetric Ash Test at 600 C | Measures inorganic impurities as non-volatile residue remaining after high-temperature ignition. |
| Heavy Metals (as Pb) | Colorimetric Thioglycolic Acid Test | Forms colored metal-thioglycolate complexes under controlled pH; compared visually or spectrophotometrically against lead standard. |
| Sulfate | Barium Sulfate Gravimetric Method | Precipitates sulfate as BaSO4 and quantifies by weighing the dried precipitate. |
| Chloride | Potentiometric Titration with AgNO3 | Titration with silver nitrate using silver indicator electrode to detect endpoint based on AgCl precipitation. |
| Related Substances | HPLC with UV Detection | Separates and quantifies structurally related impurities (e.g., L-cysteine, cystine, cysteine sulfoxide) using reversed-phase column and UV detection at 210 nm. |
| Water Content | Karl Fischer Coulometric Titration | Electrochemically determines water via iodine generation and stoichiometric reaction with sample water. |
| pH (1% aqueous solution) | Potentiometric pH Measurement | Measures hydrogen ion activity in a defined aqueous solution using calibrated pH electrode. |
| Iron (Fe) | ICP-OES | Quantifies iron concentration by measuring characteristic atomic emission intensities after plasma atomization and excitation. |
| Microbial Limits | Membrane Filtration and Plate Count | Detects and enumerates aerobic microorganisms by filtration, membrane transfer to agar media, and colony enumeration after incubation. |
Technical Specifications of D-Cysteine
| Test Item | Specification |
|---|---|
| Appearance | White to off-white crystalline powder |
| Purity | >=98.5% |
| Water Content (KF) | <=0.5% |
| Melting Point | 175-185°C |
| Optical Rotation | +6.5° to +8.5° (c=2, H2O) |
| Total Impurities | <=1.5% |
| Heavy Metals | <=20 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-Cysteine
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of D-Cysteine
Packaging of D-Cysteine
Industrial D-Cysteine 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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