Description

L-Cysteic Acid Monohydrate is the oxidized, sulfonic acid derivative of the amino acid cysteine, offering enhanced stability and water solubility. This compound serves as a critical biochemical precursor and a versatile building block in advanced synthesis. It is essential for researchers and manufacturers in the pharmaceutical, cosmetic, and nutritional supplement industries seeking to develop or produce sulfur-containing bioactive molecules.

Application

• Pharmaceutical Intermediates: Key starting material for synthesizing taurine analogs, peptide drugs, and other sulfur-based active pharmaceutical ingredients (APIs).
• Biochemical Research: Used as a stable, soluble source of cysteic acid for studying protein oxidation, metabolism, and as a standard in amino acid analysis.
• Cosmetic & Personal Care: Incorporated into hair care formulations (permanent waves, straighteners) and skin care products for its conditioning and antioxidant properties.
• Nutritional Supplements: Potential precursor in the synthesis of taurine and other conditionally essential nutrients.
• Food Science: Studied for its role as a marker of protein oxidation in food quality control and as a potential food additive.
• Chemical Synthesis: Versatile chiral building block for organic synthesis, particularly in the preparation of sulfonated compounds and specialty chemicals.

Basic Information

Product Name	L-Cysteic Acid Monohydrate
CAS No.	23537-25-9
Molecular Formula	C3H9NO6S
Molecular Weight	187.17 g/mol
Synonyms	(S)-2-Amino-3-sulfopropanoic acid monohydrate; L-3-Sulfoalanine monohydrate; (R)-2-Amino-3-sulfopropionic acid monohydrate; Cysteic Acid, L- monohydrate; Cysteic Acid Hydrate; 3-Sulfo-L-alanine monohydrate; Thioserine Sulfonic Acid; Cysteinesulfonic Acid
EINECS	Contact for details

Quality Control

Our L-Cysteic Acid Monohydrate is produced under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. A comprehensive Certificate of Analysis (COA) detailing assay, chiral purity, and impurity profiles is provided with every shipment, supporting compliance with research and cGMP guidelines where applicable.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent caking and decomposition.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference standard
Assay (HPLC)	≥ 98.0%
Optical Rotation [α]20/D	+7.0° to +9.0° (c=1 in H2O)
Water Content (KF)	7.0% - 9.5%
Heavy Metals (as Pb)	≤ 10 ppm
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.