Glutamic Acid[2]

Updated: 2026-09-18

Overview

Glutamic acid is a naturally occurring non-essential amino acid that plays crucial roles in protein synthesis and nitrogen metabolism. As one of the most abundant excitatory neurotransmitters in the vertebrate nervous system, it's vital for cognitive functions. Industrially produced through microbial fermentation, it serves as the precursor for monosodium glutamate (MSG), the widely used flavor enhancer. The compound exists in two optical isomers, with L-glutamic acid being the biologically active form. Its industrial production primarily uses Corynebacterium glutamicum through sugar fermentation. The global market for glutamic acid exceeds 3 million tons annually, with Asia being the dominant production and consumption region.

Physical and Chemical Properties

As a polar amino acid, glutamic acid features both carboxylic acid and amino functional groups, making it highly soluble in water (7.5 g/100 mL at 25°C). The crystalline form typically shows monoclinic prismatic structure with a density of 1.46 g/cm³. It undergoes decarboxylation when heated above 205°C. The molecule's isoelectric point occurs at pH 3.22 due to its two carboxyl groups. In aqueous solutions, it can act as both acid and base. The carboxyl group side chain (pKa ≈ 4.1) becomes deprotonated at physiological pH, giving glutamate its negative charge. This property makes it valuable as a buffer in biochemical applications.

Main Applications

The food industry consumes over 70% of produced glutamic acid, primarily converted to MSG for flavor enhancement. In pharmaceuticals, it serves as a component in parenteral nutrition solutions and a precursor for neurotransmitter-related drugs. The cosmetic industry utilizes its moisturizing properties in skincare formulations. Biotechnological applications include its use as a nitrogen source in microbial culture media. Recent research explores its potential in biodegradable polymers and as a building block for green chemistry. Agricultural uses include animal feed additives to improve protein utilization, particularly in poultry and swine nutrition.

Safety and Storage

Food-grade glutamic acid is classified as GRAS by FDA when used appropriately. Occupational exposure limits are not established, but powder forms may cause mild respiratory irritation. Proper PPE including dust masks is recommended during handling. No significant environmental hazards are associated with proper disposal. For storage, maintain in original packaging at room temperature (15-25°C) with relative humidity below 65%. Bulk quantities should be palletized and kept away from strong oxidizers. Shelf life typically exceeds 3 years when stored correctly. For laboratory use, keep containers tightly sealed to prevent moisture absorption and subsequent caking.

B2B Procurement Guide

Industrial buyers should specify required purity (typically 98-99.5%) and whether FCC, USP, or other standards apply. Food/pharmaceutical applications demand GMP-certified production facilities. Major global suppliers include Ajinomoto, Kyowa Hakko Bio, and Meihua Holdings Group. Standard packaging includes 25kg multi-layer paper bags with PE liner for smaller quantities, while bulk shipments use 500-1000kg flexible intermediate bulk containers. Lead times range from 2-6 weeks depending on quantity and destination. Quality certificates should include heavy metal content, microbiological testing, and residual solvent analysis where applicable.