Table 2.

Concentration (g L⁻¹) of organic acids and pH measured in SDW filtrates after 0, 7 and 10 days of aerobic fermentation by A. niger

Organic acids	Concentrations
	Day 0	Day 5	Day 7	Day 10
Itaconic acid	0.70 ± 0.25	0.63 ± 0.26	0.88 ± 0.22	0.87 ± 0.28
Trans-aconitic acid	5.71 ± 0.51	4.54 ± 1.4	4.32 ± 0.77	1.59 ± 0.37
Citric acid	2.84 ± 0.76	3.37 ± 0.28	1.36 ± 0.91	Bd
Isocitric acid	2.47 ± 0.46	2.52 ± 0.17	2.77 ± 0.41	Bd
Oxalic acid	0.61 ± 0.18	0.52 ± 0.14	1.45 ± 0.53	0.38 ± 0.14
pH	4.6 ± 0.1	5.07 ± 0.49	5.93 ± 1.21	5.37 ± 0.13

Each value is a mean of at least three independent experiments

Bd below detection level