Table 1 Key performance indicators during the L-phenylalanine production in a stirred-tank bioreactor (STR) or two-compartment bioreactor (TCB) with an Escherichia coli quadruple reporter strain

Integral carbon proportion of carbon dioxide during the (a) initial batch, (b) biomass production and (c) product formation phases on average, mol%

(a)

(b)

(c)

29.1 ± 0.0

47.3 ± 11.5

67.2 ± 0.5

27.7 ± 8.3

54.6 ± 9.4

67.4 ± 0.9

Biomass concentration at the start of product formation, g L⁻¹

24.8 ± 0.4

15.5 ± 0.3

Maximum biomass concentration, g L⁻¹

33.5 ± 0.5

26.8 ± 0.5

Maximum product concentration, g L⁻¹

21.5

20.6

Maximum biomass specific product formation rate, mg g⁻¹ h⁻¹

31.5

25.2