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Electrode/redox center linkage

Conditions for achieving efficient DET via enzyme immobilization are dictated partly by materials architecture. Enzyme immobilization techniques may include nonspecific adsorption, covalent linkage, entrapment in conductive polymeric films, association with metal colloids, and encapsulation within porous matrices (see Chapter 11). The simplest method is nonspecific adsorption, but control is limited various noncovalent interactions will yield different orientations of the redox center with respect to the electrode interface and, as a result, inefficient DET. [Pg.19]

A further approach to electrically wire redox enzymes by means of supramolecular structures that include CNTs as conductive elements involved the wrapping of CNTs with water-soluble polymers, for example, polyethylene imine or polyacrylic acid.54 The polymer coating enhanced the solubility of the CNTs in aqueous media, and facilitated the covalent linkage of the enzymes to the functionalized CNTs (Fig. 12.9c). The polyethylene imine-coated CNTs were covalently modified with electroactive ferrocene units, and the enzyme glucose oxidase (GOx) was covalently linked to the polymer coating. The ferrocene relay units were electrically contacted with the electrode by means of the CNTs, and the oxidized relay mediated the electron transfer from the enzyme-active center to the electrode, a process that activated the bioelectrocatalytic functions of GOx. Similar results were observed upon tethering the ferrocene units to polyacrylic acid-coated CNTs, and the covalent attachment of GOx to the modifying polymer. [Pg.348]


See other pages where Electrode/redox center linkage is mentioned: [Pg.33]    [Pg.42]    [Pg.38]    [Pg.2526]    [Pg.105]    [Pg.276]    [Pg.112]    [Pg.96]    [Pg.128]    [Pg.235]   
See also in sourсe #XX -- [ Pg.105 ]




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