Figure 2: 1H NMR spectrum of an aliquot from glucose (20 wt.%) fermentation broth after 12 h of ultraturrax exposure at 10,000 rpm, 30°C. Inset shows the ethanol peaks, a 3H (t) at 1.2 ppm and a 2H (q) at 3.7 ppm. The singlet peak at 8.5 ppm is the internal standard, HCOONa.