Table 2. Effects of initial sugar concentration of corncob hydrolysate on malic acid production in shake flasks.

Initial total sugar (g/L)	Residual sugar(g/L)	Cell biomass (g/L)	Malic acid*(g/L)	productivity(g/L h)	yield(g/g)
50	0	12.75±0.68	5.90±0.53	0.06±0.005	0.12
60	0	15.50±0.52	6.03±0.62	0.06±0.006	0.11
70	3.62	20.86±0.13	11.42±3.91	0.12±0.040	0.17
80	6.88	26.66±0.58	11.58±2.18	0.12±0.022	0.16
90	12.34	30.88±0.20	12.66±1.05	0.13±0.010	0.16
110	21.87	32.13±0.20	15.27±2.18	0.16±0.023	0.17
130	43.18	27.45±0.52	10.29±2.70	0.11±0.028	0.12

* Malic acid was obtained after hydrolysis of PMA with H₂SO₄.