PREPARATION AND PROPERTIES OF AN IMMOBILIZED SOLUBLE INSOLUBLE PECTINLYASE

An endo-pectinlyase present in a commercial mixture was immobilized on EUDRAGIT L100-55, a polymer which is reversibly soluble-insoluble dep ending on the pH of the medium. The enzymic activities of biocatalytic matrices, obtained by pre-activating the polymer either with water-so luble carbodiimide or by simple adsorption, were compared The biocatal yst obtained by adsorption showed an enzymic activity higher (500 E.U. g(-1)) than that obtained using the activated polymer (50 E.U. g(-1)) . Moreover, the activating agent did not seem to be necessary in order to stabilize the interaction between carrier and protein. In fact abo ut 80% of the initial activity was detectable on both matrices after r epeated washings with NaCl 0.2 M, The immobilization procedure did not alter the main biochemical parameters of the immobilized enzyme with respect to its native form and appreciably enhanced its stability in t he temperature range 25-45 degrees C.