Table 3.

Coating process factor design.

Parameters	Tox	Solvent	pH
A	350	EtOH	5
B	350	EtOH	11
C	350	H2O	5
D	350	H2O	11
E	500	EtOH	5
F	500	EtOH	11
G	500	H2O	5
H	500	H2O	11