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Table 1 Effect of acetate-adaptive seed culture on ZMA-142 and ZMA-167 in a 5 L fermenter using medium containing 120 g glucose/L, 195 mM sodium acetate and controlled at pH 5.0

From: Effect of acetic acid on ethanol production by Zymomonas mobilis mutant strains through continuous adaptation

Strains Fermentation time (hr) Glucose utilization (g/L) Ethanol Production (g/L) q s maxa q P maxb Yp/s c Conversion Rate (%)d
Seed culture with RM; Fermentation in FM
 ZM 481 20 107.2 46.1 5.4 2.3 0.43 84.0
 ZMA-142 22 99.2 46.5 4.5 2.1 0.47 91.8
 ZMA-167 22 100.0 43.7 3.9 1.7 0.44 86.0
Seed culture with RM; Fermentation in FM, 195 mM NaOAc, pH 5
 ZM 481 64 11.40 2.3 0.2 0.04 0.20 39.1
 ZMA-142 56 103.9 48.0 1.86 0.9 0.46 90.2
 ZMA-167 64 100.7 44.3 1.57 0.7 0.44 86
Seed culture with RM, 146 mM NaOAc; Fermentation in FM, 195 mM NaOAc, pH 5
 ZM 481 48 12.4 2.9 0.3 0.1 0.23 45.0
 ZMA-142 36 97.2 60.8 2.7 1.7 0.63 122.4
 ZMA-167 48 86.6 47.4 1.8 1.0 0.55 107.2
  1. aqs max: Total sugar utilization rate (g l-1 h-1)
  2. bqp max: Ethanol production rate (g l-1 h-1)
  3. cYp/s: Ethanol yield on total sugars (g g-1)
  4. dConversion Rate(%) = (Yp/s) x 100%/(Theorical Yp/s), Theorical Yp/s = (46*2)/180.16 = 0.51143