For procurement specialists and R&D chemists, understanding the technical specifications of L-Arginine (CAS 74-79-3) is crucial for making informed purchasing decisions. As a widely used amino acid in the pharmaceutical and food industries, its quality parameters directly influence product performance and compliance. This guide breaks down the key specifications to look for when buying L-Arginine.

The Appearance of L-Arginine is typically described as white crystals or crystalline powder. This visual characteristic is an initial indicator of product quality. Any deviation from this standard might suggest processing issues or contamination, which is why discerning buyers pay close attention to this detail when sourcing from an L-Arginine supplier.

The Assay is perhaps the most critical specification, indicating the purity of the L-Arginine. For pharmaceutical and high-grade food applications, the assay usually ranges from 98.5% to 101.5%. This narrow window ensures that the product contains the expected concentration of L-Arginine with minimal impurities. When comparing L-Arginine price, ensure that the offered price is for the specified purity level.

Other important specifications often found on a Certificate of Analysis (CoA) include:

  • Specific Rotation: This optical property (e.g., 26.0° to 27.9°) helps confirm the enantiomeric purity of L-Arginine.
  • Loss on Drying: Typically specified as not more than 1.0%, this measures the moisture content.
  • Residue on Ignition: A low limit (e.g., ≤0.20%) indicates minimal inorganic impurities.
  • Arsenic (As) and Heavy Metals (Pb): Strict limits (e.g., ≤1.5ppm for Arsenic, ≤15ppm for Heavy metals) are enforced, especially for pharmaceutical and food grades, to ensure safety.
  • pH: The pH of an aqueous solution (e.g., 10.5-12.0) provides information about the product's chemical nature.

When you decide to purchase L-Arginine, always request a detailed CoA from the L-Arginine manufacturer. This document is your primary assurance of product quality. Reputable L-Arginine suppliers in China and globally will readily provide this information. Understanding these specifications empowers you to negotiate effectively and secure L-Arginine for sale that perfectly matches your technical requirements.

By focusing on these specifications, you can confidently select the best L-Arginine product for your needs, ensuring both quality and value.