1. Introduction
l-Glutamic acid (GA), a flavor enhancer used throughout
the world and a starting material for the synthesis of various
speciality chemicals, is produced using Corynebacterium or
Brevibacterium strains by means of aerobic processes requiring
the ultimate electron acceptor oxygen, throughout
the fermentations [1–3]. It can be seen from the central
metabolic pathway of these bacteria that, GA is produced
from -ketoglutaric acid (KG), an intermediate of the tricarboxylic
acid (TCA) cycle which requires oxygen for its
operation. The carbon-energy source glucose is converted to
pyruvic acid (Pyr) by the glycolysis pathway