Description

Cysteine-Rich Protein, Mammalian is a specialized protein isolate characterized by a high content of the sulfur-containing amino acid cysteine. This biochemical profile is critical for applications requiring robust antioxidant activity, metal chelation, and structural support in biological systems. It serves as a valuable raw material and research reagent for manufacturers and scientists in the pharmaceutical, biotechnology, and nutraceutical industries.

Application

• Biopharmaceutical Research & Development: Used as a key component in cell culture media optimization, protein folding studies, and as a model protein for investigating redox biology and oxidative stress pathways.
• Nutraceutical & Dietary Supplement Formulation: Incorporated into advanced supplement blends for its potential antioxidant and detoxification support properties, leveraging its high cysteine content as a precursor to glutathione.
• Cosmetic & Personal Care Actives: Serves as a functional ingredient in anti-aging and skin-repair formulations due to its role in supporting keratin structure and cellular antioxidant defense mechanisms.
• Biochemical Reagent & Standard: Employed as a calibrated standard in analytical methods such as HPLC, electrophoresis, and amino acid analysis for quality control in protein-related manufacturing.
• Enzyme Stabilization & Activity Studies: Utilized to investigate the protective effects of thiol-rich proteins on enzyme activity, particularly for sulfhydryl-dependent enzymes susceptible to oxidation.

Basic Information

Product Name	Cysteine-Rich Protein, Mammalian
CAS No.	130704-09-5
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Cysteine-rich mammalian protein; High-cysteine protein; Thiol-rich protein fraction; Mammalian cysteine protein isolate; CRP (Cysteine-Rich Protein); Sulfur-rich protein; Keratin-associated protein fraction; Antioxidant protein fraction
EINECS	Contact for details

Quality Control

Our Cysteine-Rich Protein, Mammalian is produced and tested under a rigorous quality management system. Each batch is analyzed to ensure identity, purity, and consistency. While specific grades are available, our standard quality control includes assessment of protein content, cysteine/cystine ratio, and microbiological safety. Certificates of Analysis (COA) documenting full specifications are available upon request to support your regulatory and quality assurance needs.

Storage

Preserve in a tightly closed container, protected from light. Store at 2-8°C (cold chain) for long-term stability. This product is hygroscopic (moisture-sensitive); ensure the container is sealed tightly after each use to prevent absorption of atmospheric moisture. For extended storage under inert atmosphere, please contact our technical team for specific recommendations.

Specification

Item	Specification
Appearance	White to off-white powder or lyophilized solid
Identification (IR)	Conforms to standard
Protein Content (Biuret/Kjeldahl)	≥ 90%
Cysteine + Cystine Content	≥ 15% (of total amino acids)
Assay (HPLC)	Contact for details
Loss on Drying	≤ 5.0%
Residue on Ignition	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Total Plate Count	≤ 1000 cfu/g
Yeast & Mold	≤ 100 cfu/g
E. coli	Negative
Salmonella	Negative

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