Table 3 - Production of citric acid by Aspergillus niger using cane molasses in a stirred fermentor

Table 3. Kinetic parameters for citric acid production from molasses sugars following growth of Aspergillus niger strains.

Kinetic parameters	GCBT2	GCBT7	GCBT8
Citric acid formation parameters	-
Qp (g/l/h)	0.543	0.590	0.507
Yp/s (g/g)	0.763	0.929	0.748
Yp/x (g/g)	5.229	4.237	3.817
qp (g/g cells/h)	0.036	0.029	0.026
Substrate consumption parameters	-
µ (h^-1)	0.540	0.589	0.506
Yx/s (g/g)	0.219	0.219	0.196
Qs (g/l/h)	0.711	0.635	0.678
Qx (g cells/l/h)	0.104	0.139	0.133
qs (g/g cells/h)	0.047	0.032	0.035

Kinetic parameters:
Qp: g citric acid produced/l/h;
Yp/s: g citric acid produced/g substrate consumed:
Yp/x: g citric acid produced/g cells formed;
Qp: g citric acid produced/g cells/h;
µ(h^-1): specific growth rate;
Yx/s: g cells/g substrate utilized;
Qs: g substrate consumed/l/h;
Qx: g cell mass produced/l/h;
Qs: g substrate consumed/g cells/h.

Substrate consumption parameters