Adsorption Method, Alumina, Bentonite Phosphate Gels, Carboxymethyl Cellulose, Carboxymethyl Sephadex, Collagen, DEAE-Cellulose, DEAE-Sephadex

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Biocatalysis and Enzyme Biotechnology Biocatalysis and Enzyme Biotechnology - Introduction Some Research Activities Involving Enzymatic Synthesis Properties of Enzymes Parameters Affecting Enzymatic Reactions Definitions of Some Parameters used for Describing Key Properties of Enzymes Medium for Enzymes Aqueous vs Organic Solvent Selectivity of Enzymes Types of Enzymes Biomimetic Catalysts Enzymes Commonly Used in Organic Synthesis Extremozymes Cofactor Dependent Enzymes and Cofactor Regeneration Modular Enzymes Coenzymes Use of Enzymes Medical and Clinical Uses Drugs for Digestive Disorders Industrial Uses Uses of Industrial Uses Textile Industry Uses of Leather Industry Uses of Paper Industry Cellulase Free Xylanases Uses of Food Industry Isolation and Purification of Enzymes

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Adsorption Method
An enzyme may be immobilized by adsorption to several types of materials (adsorbents with charged or neutral surfaces). Since the activity of enzyme may be significantly reduced or lost during adsorption and subsequent release, the adsorbents should be chosen such that enzymes are bound firmly with minimum inactivation. Following are some of the adsorbents often used for immobilization: alumina, amberlite CG-50, bentonite phosphate gels, carbon, carboxymethyl cellulose, carboxymethyl sephadex, collagen, DEAE-cellulose, DEAE-sephadex, glass, silica gel and titania (ceramics). The pH and ionic conditions of enzyme and adsorbent solution should be carefully controlled during immobilization. If adsorption involves predominantly ion-ion interaction with very little hydrogen bonding, then a simple shift in pH or ionic strength could exchange the protein ion for another ion causing desorption.

In a typical adsorption method for immobilization, adsorbent is packed in a water jacketed column, which is washed with a preconditioning solution. For instance, if we take titania as an adsorbent, it is washed with 0.5 NaHCO₃ and internal surfaces of the adsorbent are rendered air free. Enzyme solution is buffered fairly close to isoelectric point of the enzyme with a low ionic strength (below 0.01 µM), and is then circulated through the column at a desired temperature for several hours. After the unabsorbed enzyme solution is drained from the column, the column is washed with water, then with 0.5M NaCI and finally again with water. The immobilized enzyme column is now ready for the delivery of substrate solution and evaluation of performance.

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Extraction of Enzymes Preparation of Crude Enzymes Purification of Enzymes Chromatography Adsorption Chromatography Ion Exchange Chromatography Gel Filtration Chromatography Affinity Chromatography Electrophoresis Immobilization of Enzymes or Whole Cells Techniques for Immobilization Adsorption Method Covalent Binding Method Cross Binding Method Some Reagents Used to Immobilize Enzymes by Cross Linking Entrapping Method Entrapping by Microencapsulation Requirements for Commercial use of Immobilized Enzyme Systems Enzyme Carrier Systems Some Applications of Immobilized Enzymes and Whole Cells Reactor Types Operating Strategy Stability of Immobilization and Protection of Immobilized EnzymesCells Some Examples of the Use of Immobilized Enzymes Cells Industrial Biocatalysis Biotransformation of Polyunsaturated Fatty Acids PUFAs Hydrolalse Mediated Biotransformations Oxidative Biotransformation Enzyme Engineering