Table 1. Screening of stock cultures of Aspergillus niger for citric acid production in agitator bioreactor.

Stock cultures of Aspergillus niger

Country's name
(brand)

Total acid (g/l)

Citric acid (g/l)

Dry cell mass (g/l)

Sugar (g/l)

Optimum volume (%)

Peak day for maximum product formation

Mycelial morphology

Used

Residual

NIAB-280

NGGCB101

NRRC-1243

Korea (ab-1)

Zowang-12

Pakistan

"

U.S.A.

Korea

China

92.72

93.26

76.55

58.62

94.66

79.40

87.98

59.85

54.50

84.20

17.55

14.50

24.20

29.95

16.50

116.5

96.0

94.5

142.5

106.5

33.5

54.0

55.5

7.5

43.5

50

60

60

70

45

6

6

7

5

8

Small pellets

Small pellets

Gummy mass

Fine pellets

Small pellets

Initial sugar concentration 150 g/l, initial pH 6.0, aeration rate 1.0l/l/min, incubation temperature 30ºC. All the results are sum mean of three parallel replicates.

Supported by UNESCO / MIRCEN network