Isolation of Aflatoxin B1 from Moldy Foods by Solid-Phase Extraction Combined with Bifunctional Ionic Liquid-Based Silicas

Table 1

Levels of independent variables used in BBD.

Variables	Level
	−1	0	+1
Methanol/water (v : v) (A)	20/80	60/40	100/0
Adsorption time (min) (B)	5.0	17.5	30.0
pH (C)	2.0	4.5	7.0