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L-Cysteine, Industrial Grade
L-Cysteine, Industrial Grade, is a sulfur-containing non-essential amino acid, whose core functional group is the sulfhydryl group (-SH). It typically appears as a white crystalline powder or granules with a slight characteristic sulfur odor.
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Product Information

L-Cysteine, Industrial Grade, is a sulfur-containing non-essential amino acid, whose core functional group is the sulfhydryl group (-SH). It typically appears as a white crystalline powder or granules with a slight characteristic sulfur odor. Compared to food and pharmaceutical grades, industrial grade has less stringent requirements regarding purity, impurity control (e.g., heavy metals, arsenic), and microbiological limits, focusing more on its chemical functionality and cost-effectiveness. Leveraging its unique reducing properties, metal chelating ability, and role as a bioactive molecule, it is widely used in various non-food industrial sectors such as chemical synthesis, animal nutrition, flavor manufacturing, and daily chemicals.


Product Name (English)L-Cysteine, Industrial Grade
CAS No.52-90-4 (Free base) / 52-89-1 (Hydrochloride)
Physical Properties- White crystalline powder or granules
- Characteristic slight sulfurous odor
- Soluble in water, ammonia, alkaline solutions; insoluble in common organic solvents
- Reductive property, unstable in air (oxidizes to cystine)
Applications- Reducing agent and intermediate in chemical synthesis
- Additive in animal feed for poultry and pets
- Precursor for flavors (e.g., meat flavors) and cosmetics
- Raw material for pharmaceutical intermediates
SpecificationsPurity (on dry basis): ≥98.0% - 98.5%
Specific Rotation [α]²⁰D: +4.5° to +8.0° (confirms L-form identity)
Loss on Drying: ≤0.8%
Residue on Ignition: ≤0.2%
Heavy Metals (as Pb): ≤20 mg/kg
Other Amino Acids: Controlled (by TLC or HPLC)
Packaging5 KG/bag, 25 KG/drum (double sealed with inner plastic bag, moisture-proof)


Product Nature

  1. Physical Properties:
    · Appearance: White crystals or crystalline powder.
    · Solubility: Soluble in water, ammonia, and alkaline solutions; insoluble in organic solvents like ether and acetone.
    · Optical Activity: Levorotatory, characteristic of its L-configuration.

  2. Chemical & Functional Properties:
    · Strong Reducing Property: The sulfhydryl group (-SH) is readily oxidized, making it an effective reducing agent to protect other substances from oxidation or to cleave disulfide bonds (-S-S-).
    · Metal Chelation: Can form stable complexes with various metal ions (e.g., Cu²⁺, Fe²⁺).
    · Bioactivity: As an amino acid, it can participate in or influence certain biochemical processes.
    · Instability: Readily oxidized in air, especially under neutral and alkaline conditions, to form L-cystine (containing disulfide bonds), thereby losing its reductive activity. Proper storage is crucial.

Product Usage

  1. Chemical Synthesis:
    · Reducing Agent & Intermediate: Used as a reducing agent in organic synthesis or for producing other cysteine derivatives and sulfur-containing chemicals.

  2. Animal Nutrition:
    · Feed Additive: Primarily used in poultry (e.g., chickens, ducks) and pet feed as an amino acid supplement to promote growth and feather quality.

  3. Flavor Industry:
    · Flavor Precursor: Used in the production of meat flavors (e.g., beef, chicken) via Maillard reaction with sugars.

  4. Daily Chemicals:
    · Cosmetic Ingredient: Used in producing cosmetics claiming "hair care" or "skin care" benefits, such as perm agents and moisturizers (must comply with cosmetic ingredient regulations).

  5. Pharmaceutical Industry:
    · Pharmaceutical Intermediate: Serves as a starting material for synthesizing certain drugs (e.g., N-acetylcysteine).

  6. Biotechnology:
    · Biochemical Reagent: Used in cell culture or as a stabilizer for certain enzymes.

Safety Matters

  1. Health Hazards:
    · May be irritating to eyes, skin, and respiratory tract. Dust may cause discomfort.
    · Inhalation of dust may cause respiratory irritation.
    · STRICTLY NOT FOR USE IN FOOD, PHARMACEUTICALS, OR DIRECT HUMAN APPLICATION. Industrial grade is not produced to relevant safety standards and may contain impurities unsuitable for human use.

  2. Handling Protection:
    · Must be handled in a well-ventilated area. Wear a dust mask, chemical safety goggles, and chemical-resistant gloves.
    · Avoid dust formation. Avoid contact with eyes, skin, and clothing.
    · Wash hands and exposed skin thoroughly after handling.

  3. Storage & Transportation:
    · Store in a cool, dry, light-resistant, tightly sealed container, preferably under nitrogen or vacuum, and ideally at low temperature (e.g., 2-8°C). This is the most critical measure to prevent oxidative degradation.
    · Keep containers tightly closed.
    · Must be stored separately from food, pharmaceuticals, feed, and food/pharmaceutical grade raw materials. Clearly label "For Industrial Use Only - Not for Food or Drug Use".

  4. Fire Fighting:
    · Combustible. Use water, foam, dry chemical, or CO2 to extinguish fire.
    · May decompose at high temperatures, producing toxic and irritating fumes, including nitrogen oxides (NOx) and sulfur oxides (SOx).

FAQ

Q:What are your main products?
A:We specialize in five core areas: general chemicals and food additives, water treatment and disinfection chemicals, oilfield drilling additives, fertilizers and soil conditioners, and solvents and specialty chemicals. We provide one-stop chemical procurement and solutions across multiple industries. 

Q:How do you ensure the consistent quality and reliability of your products?
A:Quality is our cornerstone. We are ISO 9001 certified for quality management, ISO 14001 for environmental management, and ISO 45001 for occupational health and safety. We implement strict quality control throughout the entire process, from raw material procurement to factory delivery, to ensure that every batch of products meets specifications.

Q:Can you provide customized products or solutions based on our specific needs?
A:Of course. We have a dedicated R&D and technical team dedicated to solving our customers' specific challenges. Whether it's adjusting product formulas, developing specific specifications, or customizing solutions for your processes, we are happy to provide customized services. Please provide your specific requirements and our engineers will work with you.

Q:What kind of technical support and after-sales service do you provide if problems arise?
A:We provide comprehensive technical support and after-sales service. We have a dedicated team to assist with everything from product selection guidance and application support to rapid response to after-sales issues. We promise to provide timely and professional feedback on your inquiries to ensure smooth operations.

Q:What is the minimum order quantity (MOQ) and delivery time?
A:To meet the needs of diverse customers, we offer flexible MOQs. The specific MOQ and delivery time depend on the product type and order size. We will provide you with a detailed quote, MOQ, and estimated delivery time within 24 hours of receiving your detailed inquiry.

Q:Do your products comply with international environmental and safety standards?
A:Yes, compliance is a key aspect of our product design. Our product development and production processes strictly adhere to relevant international and regional regulations. We also actively offer product options that comply with standards such as REACH and RoHS, and provide you with detailed Safety Data Sheets (SDS) to ensure safe and compliant use.

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