Figure 1.

Stacked plot of d-DNP-enhanced single-scan ¹³C NMR spectra of 16 tomato samples. At right, labels “a” to “h” refer to spectra of red–ripe fruit extracts, and “i” to “p” refer to mature–green fruit extracts. Selections from 76–82, 94–110, and 174–190 ppm are shown to focus on spectrally populated regions (full spectrum in Figure S7). The sample for the blank control spectrum (top) has signals only from Na-TSP-d₄ (188.6 ppm) and EDTA·Na₂·2H₂O (182.9 ppm).