Overview
Aspartic acid excipient is a versatile non-active ingredient widely used in pharmaceutical formulations. Derived from natural sources or synthesized, it serves as a buffering agent, solubility enhancer, or stabilizer in injectables, tablets, and oral solutions. Its chiral nature (L-form) ensures compatibility with biological systems, making it ideal for drug delivery. As a dibasic amino acid, it participates in metabolic pathways, adding to its safety profile. Regulatory agencies like the FDA and EMA classify it as GRAS (Generally Recognized as Safe), further solidifying its role in GMP-compliant manufacturing.
Physical and Chemical Properties
Aspartic acid excipient typically appears as a white, odorless crystalline powder with a slightly acidic taste. Its high solubility in water (1g/2.5mL at 25°C) makes it suitable for liquid formulations, while its thermal stability (decomposition at 270°C) ensures resilience during processing. The compound exhibits zwitterionic properties in aqueous solutions, acting as both an acid and a base. This characteristic enables effective pH buffering in the range of 2.5–4.0, critical for maintaining drug stability. Its molecular weight (133.10 g/mol) and low hygroscopicity further contribute to predictable formulation behavior.
Main Applications
In pharmaceuticals, aspartic acid excipient primarily functions as a pH adjuster in parenteral drugs like IV infusions, where precise acidity control is vital. It also chelates metal ions, preventing catalytic degradation of APIs. Biopharmaceuticals leverage its properties to stabilize protein-based therapeutics. Beyond drugs, it serves as a nutrient supplement in enteral formulas due to its role in the urea cycle. Recent advancements explore its use in nanoparticle drug carriers, where its carboxyl groups enable surface functionalization for targeted delivery.
Safety and Storage
Aspartic acid excipient requires standard laboratory precautions: use gloves and eye protection to avoid irritation from dust. While non-toxic, prolonged skin contact may cause mild dryness. Store in sealed containers away from moisture to prevent clumping. Regulatory compliance mandates documentation of heavy metal residues (<10ppm) and microbial limits (TPC <1000 CFU/g). Stability studies indicate a 3-year shelf life when stored below 25°C at relative humidity <60%. Avoid incompatible materials like strong oxidizers.
B2B Procurement Guide
Pharmaceutical buyers should prioritize suppliers with ISO 9001 certification and USP-NF/Ph.Eur. monographs. Key specifications include purity (≥98.5%), optical rotation (+24.8° to +25.8°), and residual solvent levels (methanol <3000ppm). Bulk purchases (25kg drums) typically offer 10-15% cost savings. Audit suppliers for consistent particle size distribution (80-200 mesh) and validated sterilization methods if for injectable use. Spot-check certificates of analysis for endotoxin levels (<0.5 EU/mg for parenteral grades).
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