The immobilization of 6-amylase on acid chloride of carboxvmethylcellulose (DS = 2.02) and BIOZAN R is presented. Kinetic studies established the following conditions for a optimum coupling : pH = 8.4, time = 2 h, temperature = 5°C. The immobilization on BIOZAN R was carried out by usinq the BIOZAN R acid chloride or by activation with dicyclocarbodiimide. The results showed that the nature of the carrier and the method of immobilization determine directly the quantity and the activity of the coupled 6-amylase. INTRODUCTIONLes enzymes insolubilisees representent de nos jours un domaine de recherche trss vaste qui ne fait que se developper au fil des annees. Vue la diversification des mBthodes d'immobilisation d'enzymes et les supports qui les lient, elles trouvent des champs d'application trss importants en analvse" 2, en biochimie c o m e modsles des reactions cellulaires3' 4, en et surtout en chimie alimentaire'. Les supports utilises sont soit svnthetiques, soit naturels. Un interst particulier est accord6 aux derives de la cellulose. Parmi ceux constamment employes il y a la 4-aminobenzovlcellulose, la 4-aminobenzyl-
Insolubilization of @-amylase on cellulose carbonate and aminoaromatic derivatives of carboxymethylcellulose (CMC), such as N-(rl-aminophenyl)-CMC amide and N-(4,4'-diaminodibenzyl)-CMC amide, is presented. The optimum coupling conditions depend on the nature of the carrier. By comparing the kinetic data for the reactions of insolubilized enzymes some conclusions are drawn regarding the influence of the support and of the binding mode on the activity of the coupled enzyme. INTRODUCTIONLes enzymes, biocatalysateurs essentiels de la vie, ont dans la conjoncture economique actuelle une importance practique de plus en plus grande &ant donnee leur utilisation de plus en plus frequente dans beaucoup de processus industriels. Leur insolubilisation a permis d'eliminer toute une aerie d'inconvenients comme par exemple l'epuisement apres un cycle d'utilisation ou l'insuffisance de la stabilite' thermique. Lea polymeres naturels hydrophiles sont des supports ideaux pour lier des enzymes car ils creent autour de pelles-ci un microenvironnenent a d h u a t depR et de concentration ionique.
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