Table 2. Comparison of kinetic parameters for the production of citric acid from cane-molasses following growth of different cultures of Aspergillus niger.

Kinetic parameters

Selected stock cultures of Aspergillus niger

NIAB-280

NGGCB101

NRRC-1243

Korea (ab-1)

Zowang-12
Substrate consumption parameters
          
µ (h-1)
 0.495±0.02 0.593±0.02 0.4349±0.01 0.234±0.02 0.548±0.03
Yx/s (g cells/g)
 0.194±0.03 0.204±0.03 0.108±0.02c 0.098±0.04 0.148±0.04
Qs (g/l/h)
 0.767±0.02 0.962±0.02 0.515±0.02 0.531±0.03 0.704±0.04
qs (g/g cells/h)
 0.063±0.03 0.093±0.03 0.050±0.01 0.051±0.02 0.080±0.03
Qx (g cells/l/h)
 0.073±0.03 0.078±0.03 0.061±0.03 0.063±0.03 0.074±0.04
Product formation Parameters
          
Qp (g/l/h)
 0.193±0.03 0.290±0.03 0.149±0.03 0.236±0.03 0.248±0.02
Yp/s (g/g)
 0.340±0.02 0.940±0.02 0.872±0.03 0.442±0.02 0.887±0.03
Yp/x (g/g cells)
 3.600±0.03 6.620±0.03 4.392±0.04 3.752±0.02 7.360±0.04
Qp   qp (g/g cells/h)
 0.021±0.02 0.081±0.02 0.044±0.02 0.072±0.03 0.043±0.04

LSD

0.234

0.456

0.098

0.102

0.248

Significance level  < p >

S

HS

-

-

S

Each value is an average of three parallel replicates. ± Indicates standard deviation among replicates. p indicates probability significance level. The values differ significantly at p < 0.05. HS denotes that the values are highly significant while S is for only significant values. LSD is for least significant difference.

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