Optimization of Process Parameters for the Production of Soy Protein by Ultrafiltration Using ANN

Table 3

Regression coefficients and significance of each variable on membrane process parameters.

Source	Permeate flux		Protein content of retentate		Protein retention percentage
	Coefficient	value	Coefficient	value	Coefficient	value
Intercept	11.67	<0.0001	86.71	<0.0001	0.99	0.0060
	2.63	<0.0001	5.50	<0.0001	0.00	<0.0001
	0.95	0.0031	0.51	0.3124	0.00	0.4862
	-0.39	0.1874	-0.50	0.3209	0.00	0.4045
	0.52	0.0819	-0.75	0.1434	0.00	0.4996
	-0.30	0.3078	0.32	0.5282	0.00	0.4361
	-0.71	0.1540	0.26	0.7593	0.00	0.8387
	-0.13	0.7949	0.04	0.9635	0.00	0.5930
	-0.16	0.7376	-0.43	0.6076	0.00	0.2977
	-1.00	0.0494	-0.37	0.6623	0.00	0.8812
	-0.08	0.8761	-0.97	0.2792	0.00	0.4267
	-0.35	0.4982	0.31	0.7281	0.00	0.4009
	0.45	0.3881	-0.25	0.7795	0.00	0.9465
	0.53	0.3078	-1.07	0.2337	0.00	0.4465
	-0.42	0.4202	-0.27	0.7580	0.00	0.5952
	0.27	0.6009	-1.14	0.2053	0.00	0.3912
	-8.17	<0.0001	-11.27	<0.0001	0.00	0.0030
	-0.79	0.0303	0.16	0.7836	0.00	0.2221
	-0.25	0.4690	0.26	0.6651	0.00	0.0362
	-0.67	0.0648	-1.93	0.0032	0.00	0.0012
	-0.75	0.0387	-1.75	0.0068	0.00	0.2946
	0.95		0.94		0.70
Adj	0.91		0.88		0.46
value	23.56		18.01		2.93
C.V (%)	15.53		2.21		0.33
LOF	2.17	NS	3.1	NS	0.2	NS

: ultrafiltration membrane module; : transmembrane pressure; : volume concentration ratio; : diafiltration; : flow rate.