Xylanase recovery by reversed micelles using cationic surfactant (N-benzyl-
N-dodeeyl-N-bis(2-hydroxyethhyl)ammonium chloride) BDBAC was evaluated unde
r different experimental conditions. A full factorial design with center po
int was employed to verify the influence of different factors on the recove
ry. A mathematical model was found to represent the xylanase yield (Y) as a
function of BDBAC and hexanol: Y = 4.32 + 5.1B + 2.64D + 0.83B(2) + 1.46D(
2), where B = BDBAC and D = hexanol. The highest xylanase recovery (27%), i
ndicated by the model was attained at pH = 8.1, BDBAC = 0.38 M and hexanol
= 8.6%. Under these conditions, and to test the model, a new xylanase extra
ction was performed in laboratory, giving 29.4% recovery yield, this value
was similar to that predicted by the model.