Table 1.

Effect of carbon sources on citric acid production by Candida tropicalis (F value = 279.651) and Pichia kluyveri (F value = 85.656).

Carbon sources	Yeast isolates
	Candida tropicalis		Pichia kluyveri
	Citric acid (g/L)	Biomass (g/L)	Citric acid (g/L)	Biomass (g/L)
Ethanol	26.36 ± 0.40	6.53 ± 0.29	17.13 ± 0.31	7.30 ± 0.52
Glycerol	21.96 ± 0.88	10.76 ± 0.23	22.43 ± 0.65	9.80 ± 0.20
Starch	21.96 ± 0.94	7.10 ± 0.41	11.43 ± 0.29	4.20 ± 0.34
Glucose	49.36 ± 0.75	11.53 ± 0.44	27.06 ± 0.40	7.96 ± 0.23
Sucrose	17.06 ± 0.63	4.86 ± 0.31	21.33 ± 0.57	9.03 ± 0.29
Fructose	6.76 ± 0.80	1.08 ± 0.22	2.23 ± 0.59	3.30 ± 0.37
Maltose	35.33 ± 0.74	8.73 ± 0.52	9.13 ± 0.58	6.20 ± 0.47
Mannitol	28.66 ± 0.83	6.40 ± 0.32	14.66 ± 0.73	8.56 ± 0.31

Mean ± standard error (n = 3) were presented.