DL-Cysteine Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 3374-22-9 |
| Product name | DL-Cysteine |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Industrial 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-Cysteine
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk DL-Cysteine Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of DL-Cysteine
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Used in the preparation of expectorant and mucolytic drugs (e.g., acetylcysteine); serves as an adjunctive component in the treatment of bronchitis and cough | Chemical synthesis, pharmaceutical formulation |
| Food | Flour treatment agent; promotes gluten formation in baked goods to improve dough quality and physical properties | Direct addition, dough mixing |
| Cosmetics | Used in hair-waving and permanent-wave solutions to modify hair structure by cleaving disulfide bonds; functions as a conditioning agent in hair-care products | Chemical formulation |
| Chemicals | Used in the preparation of heavy-metal chelating agents; serves as an electroplating additive or metal surface treatment agent | Chemical synthesis, electroplating |
Manufacturing Quality Control of DL-Cysteine
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (DL-Cysteine Content) | Acid-Base Titration with NaOH | Direct titration of the carboxylic acid group using standardized sodium hydroxide solution with phenolphthalein indicator. |
| Optical Rotation | Polarimetry | Measurement of the angle of rotation of plane-polarized light caused by chiral DL-cysteine in solution. |
| Heavy Metals (as Pb) | Colorimetric Method with Dithizone | Reaction of heavy metal ions with dithizone under controlled pH to form colored complexes, measured spectrophotometrically. |
| Sulfate (SO4) | Gravimetric Analysis | Precipitation of sulfate as barium sulfate followed by drying and weighing of the precipitate. |
| Chloride (Cl) | Argentometric Titration (Mohr Method) | Titration with silver nitrate using potassium chromate as indicator; endpoint signaled by formation of reddish-brown silver chromate. |
| Loss on Drying | Thermogravimetric Analysis (TGA) or Oven Drying | Determination of volatile content by measuring mass loss after heating at 105 C for 2 hours under standard conditions. |
| Residue on Ignition | Ignition and Gravimetry | Heating sample to 600-700 C to oxidize organic matter, then weighing inorganic residue. |
| pH (1% aqueous solution) | Potentiometric pH Measurement | Measurement of hydrogen ion activity using calibrated pH electrode in a 1% w/v aqueous solution. |
| Specific Impurities (Cystine, Cysteine Oxide) | High-Performance Liquid Chromatography (HPLC) | Separation and quantification of related amino acids and oxidation products using reversed-phase C18 column and UV detection. |
| Iron (Fe) | Atomic Absorption Spectroscopy (AAS) | Quantification of iron by measuring absorption of specific wavelength light by ground-state Fe atoms in flame. |
| Arsenic (As) | Hydride Generation AAS (HG-AAS) | Conversion of arsenic to arsine gas, followed by atomic absorption measurement in quartz cell. |
| Microbial Limits | Membrane Filtration and Plate Count | Filtration of solution through membrane, followed by incubation on appropriate agar media and colony enumeration. |
Technical Specifications of DL-Cysteine
| Test Item | Specification |
|---|---|
| Appearance | White crystalline solid |
| Purity | >=98.0% (HPLC) |
| Water Content (KF) | <=0.5% |
| Melting Point | 175-179°C |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Heavy Metals | <=10 ppm |
| Residue on Ignition | <=0.1% |
| Optical Rotation | -0.5° to +0.5° (c=1, H2O) |
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-Cysteine
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of DL-Cysteine
Packaging of DL-Cysteine
Industrial DL-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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