Corrigendum

This article refers to:

Studies on Solvent Extraction of Ethanol during Fermentation under Agitated Condition

The authors of ‘Studies on Solvent Extraction of Ethanol during Fermentation under Agitated Condition’, published in Indian Chemical Engineer, Vol. 54, No. 4 / October – December 2012, (Pp. 245–261), regret certain inadvertent errors in the data provided in Tables 2 and 3 of their referred paper.

The corrected tables are published below.

Table 2. Alcohol Fermentation in Agitated Condition in presence of Ethyl Benzene as Solvent in Glass reactor (Both phase agitated):

		Control (Broth 200ml)	Control (Broth 200ml, Solvent 50ml)	Both phase agitated (Aqueous phase - 200 ml, Solvent phase - 50 ml)
Incubation Period (Hours)	Parameter	Static (without Solvent)	Static (with Solvent)	Agitation (100rpm)	Agitation (150rpm)	Agitation (200rpm)	Agitation (250rpm)	Agitation (300rpm)
0	OD(600nm) (Aqueous Phase)	0.245	0.245	0.253	0.247	0.259	0.249	0.251
	Cell Count, No/ml (Aqueous Phase)	9.78E+08	9.78E+08	6.37E+08	5.73E+08	5.73E+08	3.61E+08	5.13E+08
	Residual Glucose%(w/v)	9.85	9.85	9.92	9.89	9.86	9.91	9.87
8	OD(600nm) (Aqueous Phase)	0.475	0.473	0.477	0.483	0.491	0.493	0.495
	Cell Count, No/ml (Aqueous Phase)	5.61E+09	5.58E+09	5.63E+09	5.73E+09	5.77E+09	5.81E+09	5.83E+09
	Ethanol%(v/v) (Aqueous Phase)	1.02	1.02	1.09	0.97	0.95	0.93	0.89
	Ethanol%(v/v) (Solvent phase)	-	-	NIL	NIL	NIL	NIL	NIL
	Total Ethanol%(v/v)	1.02	1.02	1.09	0.97	0.95	0.93	0.89
	Residual Glucose%(w/v)	7.55	7.54	7.37	7.64	7.65	7.72	7.75
	Glucose Consumed%(w/v)	2.30	2.31	2.55	2.25	2.21	2.19	2.12
	Fermentation Efficiency%(w/w)	68.55	68.25	66.07	66.64	66.44	65.64	64.89
12	OD(600nm) (Aqueous Phase)	0.676	0.675	0.677	0.681	0.685	0.663	0.651
	Cell Count, No/ml (Aqueous Phase)	9.35E+09	9.27E+09	7.37E+09	7.67E+09	7.73E+09	3.81E+09	2.17E+09
	Ethanol%(v/v) (Aqueous phase)	1.67	1.65	1.39	1.36	1.30	1.29	1.19
	Ethanol%(v/v) (Solvent Phase)	-	-	NIL	NIL	0.053	0.06	0.06
	Total Ethanol%(v/v)	1.67	1.65	1.39	1.36	1.0506	1.044	0.964
	Residual Glucose%(w/v)	6.21	6.24	6.71	6.56	6.21	6.26	6.40
	Glucose Consumed%(w/v)	3.64	3.61	3.21	3.33	3.65	3.65	3.47
	Fermentation Efficiency%(w/w)	70.92	70.64	66.93	63.13	44.49	44.21	42.94
16	OD(600nm) (Aqueous Phase)	0.711	0.710	0.747	0.731	0.647	0.631	0.587
	Cell Count, No/ml (Aqueous Phase)	3.31E+10	3.11E+10	9.95E+09	9.05E+09	7.05E+09	3.07E+09	2.21E+08
	Ethanol%(v/v) (Aqueous phase)	2.31	2.30	1.57	1.67	1.61	1.58	1.47
	Ethanol%(v/v) (Solvent Phase)	-	-	NIL	NIL	0.065	0.076	0.076
	Total Ethanol%(v/v)	2.31	2.30	1.57	1.67	1.301	1.2792	1.1912
	Residual Glucose%(w/v)	5.07	5.10	6.32	6.18	5.53	5.51	5.62
	Glucose Consumed% w/v)	4.78	4.75	3.60	3.71	4.33	4.40	4.25
	Fermentation Efficiency%(w/w)	74.70	74.84	67.41	69.58	46.44	44.94	43.32
20	OD(600nm) (Aqueous Phase)	0.798	0.795	0.793	0.781	0.501	0.497	0.498
	Cell Count, No/ml (Aqueous Phase)	2.05E+11	1.95E+11	3.63E+10	3.33E+10	3.03E+09	1.23E+08	9.03E+07
	Ethanol%(v/v) (Aqueous Phase)	3.41	3.39	1.98	1.95	1.89	1.88	1.79
	Ethanol%(v/v) (Solvent phase)	-	-	NIL	NIL	0.09	0.099	0.10
	Total Ethanol%(v/v)	3.41	3.39	1.98	1.95	1.53	1.5238	1.452
	Residual Glucose%(w/v)	2.83	2.88	5.57	5.58	4.62	4.68	4.67
	Glucose Consumed% w/v)	7.02	6.97	4.35	4.31	5.24	5.23	5.20
	Fermentation Efficiency%(w/w)	75.08	75.17	70.36	69.93	45.14	45.03	43.16
24	OD(600nm) (Aqueous Phase)	0.866	0.857	0.475	0.473	0.457	0.448	0.436
	Cell Count, No/ml (Aqueous Phase)	1.95E+11	1.85E+11	1.31E+09	5.31E+08	3.31E+07	2.71E+07	3.71E+06
	Ethanol%(v/v) (Aqueous Phase)	3.58	3.57	2.35	2.29	2.11	2.08	1.99
	Ethanol%(v/v) (Solvent phase)	-	-	NIL	NIL	0.10	0.10	0.11
	Total Ethanol%(v/v)	3.58	3.57	2.35	2.29	1.708	1.684	1.614
	Residual Glucose%(w/v)	1.98	2.0	4.77	4.84	3.62	3.65	3.86
	Glucose Consumed% w/v)	7.87	7.85	5.15	5.05	6.24	6.26	6.01
	Fermentation Efficiency%(w/w)	70.31	70.29	70.53	70.09	42.31	41.58	41.51
30	OD(600nm) (Aqueous Phase)	0.696	0.691	0.447	0.457	0.451	0.437	0.413
	Cell Count, No/ml (Aqueous Phase)	7.35E+09	7.23E+09	1.23E+08	2.23E+08	1.13E+07	1.35E+06	2.33E+06
	Ethanol%(v/v) (Aqueous phase)	3.59	3.58	2.36	2.30	2.11	2.09	2.01
	Ethanol%(v/v) (Solvent Phase)	-	-	NIL	NIL	0.11	0.11	0.12
	Total Ethanol%(v/v)	3.59	3.58	2.36	2.30	1.71	1.694	1.632
	Residual Glucose%(w/v)	1.35	1.37	4.05	4.06	3.11	2.79	2.84
	Glucose Consumed% (w/v)	8.50	8.48	5.87	5.83	6.75	7.12	7.03
	Fermentation Efficiency%(w/w)	65.28	65.25	62.14	60.98	39.16	36.78	35.88

Table 3. Alcohol Fermentation in Agitated Condition in presence of Ethyl Benzene as Solvent in Glass reactor (Only solvent phase agitated):

		Control (Broth 200ml)	Control (Broth 200ml, Solvent 50ml)	Only solvent phase agitated (Aqueous phase - 200 ml, Solvent phase - 50 ml)
Incubation Period (Hours)	Parameter	Static (without Solvent)	Static (with Solvent)	Agitation (100rpm)	Agitation (150rpm)	Agitation (200rpm)	Agitation (250rpm)	Agitation (300rpm)
0	OD(600nm) (Aqueous Phase)	0.245	0.245	0.253	0.247	0.259	0.249	0.251
	Cell Count, No/ml (Aqueous Phase)	9.78E+08	9.78E+08	7.87E+08	6.65E+08	5.37E+08	5.73E+08	6.19E+08
	Residual Glucose%(w/v)	9.85	9.85	9.91	9.88	9.87	9.93	9.89
8	OD(600nm) (Aqueous Phase)	0.475	0.473	0.475	0477	0.483	0.488	0.475
	Cell Count, No/ml (Aqueous Phase)	5.61E+09	5.58E+09	6.61E+09	6.53E+09	6.73E+09	4.13E+09	3.13E+09
	Ethanol%(v/v) (Aqueous Phase)	1.02	1.02	1.02	1.07	1.09	0.97	0.93
	Ethanol%(v/v) (Solvent phase)	-	-	NIL	NIL	NIL	NIL	NIL
	Total Ethanol%(v/v)	1.02	1.02	1.02	1.07	1.09	0.97	0.93
	Residual Glucose%(w/v)	7.55	7.54	7.31	7.13	7.06	7.12	7.12
	Glucose Consumed% (w/v)	2.30	2.31	2.60	2.75	2.81	2.81	2.77
	Fermentation Efficiency%(w/w)	68.55	68.25	60.64	60.14	59.96	53.36	51.90
12	OD(600nm) (Aqueous Phase)	0.676	0.675	0.667	0.671	0.679	0.681	0.685
	Cell Count, No/ml (Aqueous Phase)	9.35E+09	9.27E+09	7.51E+10	8.73E+10	9.33E+09	4.71E+09	7.51E+10
	Ethanol%(v/v) (Aqueous phase)	1.67	1.65	1.51	1.53	1.65	1.45	1.36
	Ethanol%(v/v) (Solvent Phase)	-	-	NIL	NIL	NIL	NIL	NIL
	Total Ethanol%(v/v)	1.67	1.65	1.51	1.53	1.65	1.45	1.36
	Residual Glucose%(w/v)	6.21	6.24	6.15	6.02	5.64	5.77	5.86
	Glucose Consumed% (w/v)	3.64	3.61	3.76	3.86	4.23	4.16	4.03
	Fermentation Efficiency%(w/w)	70.92	70.64	62.07	61.27	60.29	53.88	52.16
16	OD(600nm) (Aqueous Phase)	0.711	0.710	0.743	0.753	0.758	0.755	0.749
	Cell Count, No/ml (Aqueous Phase)	3.31E+10	3.11E+10	5.37E+11	4.51E+11	3.37E+11	5.33E+10	2.31E+10
	Ethanol%(v/v) (Aqueous phase)	2.31	2.30	2.25	2.11	2.09	1.81	1.77
	Ethanol%(v/v) (Solvent Phase)	-	-	NIL	NIL	NIL	NIL	NIL
	Total Ethanol%(v/v)	2.31	2.30	2.25	2.11	2.09	1.81	1.77
	Residual Glucose%(w/v)	5.07	5.10	4.84	4.73	4.69	4.82	4.82
	Glucose Consumed% w/v)	4.78	4.75	5.07	5.15	5.18	5.11	5.07
	Fermentation Efficiency%(w/w)	74.70	74.84	68.60	63.33	62.37	54.75	53.96
20	OD(600nm) (Aqueous Phase)	0.798	0.795	0.746	0.756	0.767	0.736	0.681
	Cell Count, No/ml (Aqueous Phase)	2.05E+11	1.95E+11	9.05E+11	7.35E+11	4.15E+11	3.31E+10	3.15E+09
	Ethanol%(v/v) (Aqueous Phase)	3.41	3.39	3.21	3.07	3.01	2.37	2.11
	Ethanol%(v/v) (Solvent phase)	-	-	NIL	NIL	NIL	NIL	NIL
	Total Ethanol%(v/v)	3.41	3.39	3.21	3.07	3.01	2.37	2.11
	Residual Glucose%(w/v)	2.83	2.88	2.81	2.57	2.71	3.18	3.68
	Glucose Consumed% (w/v)	7.02	6.97	7.10	7.31	7.16	6.75	6.21
	Fermentation Efficiency%(w/w)	75.08	75.17	69.88	64.92	64.98	54.27	52.52
24	OD(600nm) (Aqueous Phase)	0.866	0.857	0.878	0.785	0.793	0.687	0.633
	Cell Count, No/ml (Aqueous Phase)	1.95E+11	1.85E+11	5.31E+11	8.37E+10	9.31E+10	9.35E+08	3.71E+08
	Ethanol%(v/v) (Aqueous Phase)	3.58	3.57	3.35	3.27	3.11	2.91	2.75
	Ethanol%(v/v) (Solvent phase)	-	-	NIL	NIL	0.053	0.055	0.055
	Total Ethanol%(v/v)	3.58	3.57	3.35	3.27	2.4986	2.342	2.214
	Residual Glucose%(w/v)	1.98	2.0	2.04	2.07	2.02	2.62	3.14
	Glucose Consumed% (w/v)	7.87	7.85	7.87	7.81	7.85	7.31	6.75
	Fermentation Efficiency%(w/w)	70.31	70.29	65.80	64.72	49.20	49.46	50.63
30	OD(600nm) (Aqueous Phase)	0.696	0.691	0.691	0.683	0.671	0.585	0.531
	Cell Count, No/ml (Aqueous Phase)	7.35E+09	7.23E+09	7.33E+09	7.31E+09	5.37E+09	3.35E+08	2.33E+08
	Ethanol%(v/v) (Aqueous phase)	3.59	3.58	3.39	3.27	3.13	2.93	2.76
	Ethanol%(v/v) (Solvent Phase)	-	-	NIL	NIL	0.053	0.055	0.055
	Total Ethanol%(v/v)	3.59	3.58	3.39	3.27	2.5146	2.355	2.219
	Residual Glucose%(w/v)	1.35	1.37	1.35	1.37	1.82	2.37	2.74
	Glucose Consumed% (w/v)	8.50	8.48	8.56	8.51	8.05	7.56	7.15
	Fermentation Efficiency%(w/w)	65.28	65.25	61.21	59.39	48.28	48.15	47.97