... . Yeast extract, like MSG, often contains free glutamic acid. Yeast extracts in liquid form can be dried to ... or a dry powder. Glutamic acid in yeast extracts are produced from an acid-base fermentation cycle, only found ... efficiency in promoting the growth of pseudomonas bacillus, acetic acid bacillus, gluconic acid bacillus, escherichia coli, bacillus subtilus, streptococcus lactis, staphylococcus ...