Overview
DL-Cysteine is a synthetic racemic mixture of the amino acid cysteine, consisting of both L- and D-isomers. Unlike natural L-cysteine, it's produced chemically rather than through hydrolysis of animal proteins, making it suitable for vegetarian/vegan applications. The compound plays vital roles in biological systems due to its thiol (-SH) group, which contributes to its reducing properties. Industrially, DL-cysteine is classified as 'food grade' or 'pharmaceutical grade' based on purity levels. The '优级品' (high-grade) designation indicates premium quality with minimal impurities, typically ≥98.5% purity. This grade meets strict standards for sensitive applications like food processing and drug manufacturing.
Physical and Chemical Properties
DL-Cysteine appears as a white, crystalline powder with a characteristic sulfurous odor. Its thiol group makes it highly reactive, particularly as a reducing agent that can break disulfide bonds in proteins. The compound shows good thermal stability below 200°C but decomposes at higher temperatures. Chemically, it undergoes oxidation to form cystine when exposed to air. This property necessitates careful handling under inert atmospheres for some applications. Its solubility profile (freely soluble in water but poorly in organic solvents) makes it versatile for aqueous formulations while allowing easy purification through crystallization.
Main Applications
In the food industry, DL-cysteine serves as a dough conditioner (E920) that improves bread texture by breaking gluten networks. Its reducing action shortens mixing time and enhances machinability in continuous bread production lines. The compound also finds use as a flavor enhancer in meat analogs and processed foods. Pharmaceutical applications include use as a mucolytic agent in cough syrups and as a precursor for other active ingredients. Cosmetics utilize its antioxidant properties in skin-care formulations and hair-waving preparations. Industrial applications include electroplating solutions and as a stabilizer in certain polymer productions.
Safety and Storage
DL-Cysteine requires careful handling due to potential skin, eye, and respiratory irritation. Laboratories and production facilities should use local exhaust ventilation and personal protective equipment (gloves, goggles). Although not highly toxic, excessive inhalation may cause respiratory discomfort. Proper storage involves airtight containers with desiccants, maintained at room temperature in dry conditions. The material is stable under recommended conditions but may oxidize over time when exposed to air. For long-term storage, nitrogen-purged containers are advisable. Shelf life typically ranges from 2-3 years when stored correctly.
B2B Procurement Guide
When sourcing DL-cysteine, buyers should prioritize suppliers who provide comprehensive certificates of analysis (CoA) including purity, heavy metal content, and microbiological data. For food/pharma applications, verify compliance with relevant standards (USP, EP, or FCC) and request documentation of GMP manufacturing processes. Consider ordering samples for in-house testing before large purchases, particularly checking for odor, color, and solubility characteristics. Negotiate based on quantity tiers - typical MOQs range from 25kg to ton quantities. For international shipments, confirm the supplier's experience with proper packaging to prevent moisture damage during transit.
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