Figure 7.

Comparison of convolved GC/MS amino acid measurements to labeled peptide measurements determined by orbital trap. Three peptides obtained from soybean embryos cultured in [¹³C]glucose are presented. The convolved GC/MS data (gray bars) fail to faithfully describe two time points in metabolic development: growth on the plant and growth in culture. The separate biological processes result in two peptide descriptions that are overlapping but bimodal as most clearly indicated in the first peptide comparison. Direct measurement of peptides by orbital trap maintains the distinction between the two distributions (black bars). The m/z values are indexed as in Figure 5.