L-Cysteine ethyl ester hydrochloride Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 868-59-7 |
| Product name | L-Cysteine ethyl ester hydrochloride |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeReagent 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 L-Cysteine ethyl ester hydrochloride
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk L-Cysteine ethyl ester hydrochloride Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of L-Cysteine ethyl ester hydrochloride
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Synthesis of pharmaceutical intermediates for expectorants, antioxidants, and hepatoprotective agents | Used as a thiol-containing amino acid derivative in peptide synthesis or as a precursor in the chemical synthesis of active pharmaceutical ingredients (APIs) |
| Food | Food additive (dough conditioner, flavor enhancer) | Applied as a reducing agent in baking to improve dough extensibility; participates in the Maillard reaction to generate meaty flavor compounds |
| Cosmetics | Antioxidant and restorative ingredient in skin and hair care products | Leverages its thiol-based reducing activity to scavenge free radicals and support keratin structural repair; commonly incorporated into permanent waving formulations and anti-aging products |
| Biotechnology | Cell culture supplement, protein stabilizer | Added to cell culture media to maintain a reducing environment and prevent oxidative inactivation of proteins; used in recombinant protein expression systems |
| Research | Biochemical reagent, enzyme activity modulator | Applied to study the activity regulation mechanisms of thiol-containing enzymes, or used as a reference standard in chromatographic and mass spectrometric analyses |
Manufacturing Quality Control of L-Cysteine ethyl ester hydrochloride
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (L-Cysteine Ethyl Ester Hydrochloride) | Acid-Base Titration | Quantifies active compound by titration with standardized NaOH using bromothymol blue indicator; endpoint corresponds to neutralization of HCl salt. |
| Water Content | Karl Fischer Titration | Measures water via iodometric reaction where iodine is consumed stoichiometrically by water in pyridine-methanol medium. |
| Optical Rotation | Polarimetry | Determines specific rotation using sodium D-line light; confirms chiral purity and identity based on characteristic rotation angle. |
| Heavy Metals (as Pb) | Atomic Absorption Spectroscopy (AAS) | Quantifies total heavy metals after wet digestion by measuring absorbance of ground-state atoms at element-specific wavelengths. |
| Residue on Ignition | Gravimetric Analysis | Measures non-volatile inorganic impurities by ignition at 600-700 C and weighing the residual ash. |
| Chloride Content | Potentiometric Titration | Determines chloride ions using silver nitrate titrant and silver/silver chloride electrode; endpoint detected by potential inflection. |
| Related Substances | Reverse-Phase HPLC | Separates and quantifies structurally similar impurities using C18 column, UV detection at 210 nm, and gradient elution. |
| pH of Solution (5% w/v) | pH Potentiometry | Measures hydrogen ion activity in aqueous solution using calibrated glass electrode and reference electrode. |
| Sulfate | Barium Sulfate Gravimetry | Precipitates sulfate as BaSO4 in acidic medium; dried residue weighed to calculate sulfate content. |
| Loss on Drying | Thermogravimetry | Determines volatile matter by weight loss after drying at 105 C for 2 hours under controlled conditions. |
| Microbial Limits | Membrane Filtration | Detects aerobic bacteria, yeasts, and molds by filtration, membrane transfer to selective media, and colony enumeration after incubation. |
| Appearance (Color and Clarity) | Visual Inspection | Assesses physical state against standard references: white to off-white crystalline powder; clear, colorless solution in water. |
Technical Specifications of L-Cysteine ethyl ester hydrochloride
| Test Item | Specification |
|---|---|
| Appearance | White crystalline solid |
| Purity | >=98.0% |
| Water Content (KF) | <=0.5% |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Melting Point | 148~152°C |
| Optical Rotation | -12.0 to -11.0 deg (c=1, H2O) |
| Heavy Metals | <=10 ppm |
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 L-Cysteine ethyl ester hydrochloride
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of L-Cysteine ethyl ester hydrochloride
Safety Information of L-Cysteine ethyl ester hydrochloride
| Pictograms |  |
| Signal Word | Warning |
| Safety Data Sheet | |
Packaging of L-Cysteine ethyl ester hydrochloride
Industrial L-Cysteine ethyl ester hydrochloride 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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