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Table 1 Stoichiometric and kinetic growth parameters of E. coli BL21 (DE3) producer of RBD-P and RBD growing in shake flasks and bioreactor

From: Oral administration of a recombinant modified RBD antigen of SARS-CoV-2 as a possible immunostimulant for the care of COVID-19

Parameter

Shake flasks

Bioreactor

RBD

RBD + P

RBD

RBD + P

Aµ (h−1)

0.45 ± 0.01a

0.49 ± 0.01b

0.41 ± 0.03c

0.42 ± 0.01c

BXmax (A.U.)

5.81 ± 0.25a

5.56 ± 0.39a

13.90 ± 2.73b

14.91 ± 1.46b

CGlucose consumed (g/L)

7.3 ± 0.2a

6.7 ± 0.1b

14.2 ± 1.7c

13.8 ± 0.2d

DYX/S (g/g)

0.21 ± 0.02a

0.20 ± 0.01a

0.26 ± 0.01b

0.24 ± 0.02b

Soluble protein (g/L)

0.066 ± 0.028a

0.087 ± 0.027a

0.113 ± 0.014b

0.169 ± 0.034c

Insoluble protein (g/L)

1.088 ± 0.112a

1.039 ± 0.092a

0.871 ± 0.288b

1.651 ± 0.371c

Total protein (g/L)

1.154 ± 0.132a

1.126 ± 0.116a

0.930 ± 0.323b

1.819 ± 0.413c

ERBD (g/L)

0.28 ± 0.01a

0.26 ± 0.02a

0.33 ± 0.01b

0.46 ± 0.01c

FRBD in total protein (%)

24 ± 4a

23 ± 5a

35 ± 5b

25 ± 4a

DYP/X (g/g)

0.14 ± 0.02a

0.13 ± 0.02a

0.07 ± 0.02b

0.09 ± 0.01b

  1. The values represent the mean and standard deviation for three biological replicates per condition. The statistical differences are indicated with different letters (p < 0.05)
  2. A: The specific growth rate was calculated from the slope of growth in the exponential growth phase
  3. B: The maximum biomass was obtained where the biomass was the maxima, regardless of the culture time
  4. C: Glucose consumed is the initial glucose calculation subtracted from the residual glucose from Fig. 2C and D
  5. D: YX/S and YP/X were calculated from glucose consumption until the Xmax in each condition
  6. E, F: Obtained from densitometric analysis of SDS-PAGE gels of at least three biological replicates per condition