
Keywords: طراحی مرکب مرکزی; ACU; azocasein unit; ALP1; alkaline protease 1; CCD; central composite design; DH; degree of hydrolysis; DPP4; dipeptidyl peptidase 4; DPP5; dipeptidyl peptidase 5; DTT; dithiothreitol; h; concentration of free amino groups; htot; maximum concentration of