FIG. 2.

Free amino acid (aa) composition of spent medium from L. lactis MG1363 fermentation, aeration, and respiration cultures. Late-log- and stationary-phase supernatant samples of MG1363 cultures were analyzed (see Materials and Methods). Glutamine and cysteine were present at below detectable levels (not shown). Asparagine, histidine, and tryptophan determinations are not presented due to limits in test sensitivity and/or instability of these amino acids. The deviation of amino acid concentrations was less than 15% between independent cultures and determinations.