Biomolecular Films Design Function and Applications by James F. Rusling

By James F. Rusling

Examines movies of biomolecules which can offer good surfaces for catalyzing enzyme reactions, serve in biosensors and as biorecognition components, mediate nanoparticle formation, and supply a simple for basic reviews and purposes in biomedical units.

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All Rights Reserved. FIG. 5. Numbers on curves show millimolar TCA concentration in the buffer; dashed curve to the far right for TCA on a DMPC-coated electrode without Mb. (Adapted with permission from Ref. 53. ) (Fig. 9). Additons of TCA cause increases in the FeIII reduction peak with increasing concentration and decreases in the FeII oxidation peak. The general reaction is given in Scheme 3. At higher concentrations of TCA, the MbFeII oxidation peak disappears because it is completely used up in the second step of Scheme 3.

NF 0 ðE À Ej0 Þ RT  kf ;j ¼ ks tp exp Àa and !  nF 00 ¼ ks tp exp ð1 À aÞ ðE À Ej Þ RT ð10Þ  kb;j ð11Þ where ks is the apparent standard surface rate constant ðsÀ1 Þ; a is the electrochemical transfer coe⁄cient, E is applied potential, R is the gas constant, and T is temperature in kelvin. Parameters used in the ¢tting are the average 0 ks , average a, the pEj0 values, and the pGÃj values. Use of this model to ¢t SWV data at several frequencies for the FeIII=FeII redox couple of cytochrome P450cam in lipid ¢lms [60] is depicted in Fig.

Films are structured in multiple bilayers (cf. Fig. 15), with polyions associated with head groups. Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved. FIG. 15 Idealized model of a cast multibilayer surfactant film on a surface. Proteins incorporated into stacked lipid bilayers can lead to larger concentrations of redox sites per unit electrode area, resulting in larger voltammetric peaks. Self-assembled ¢lms are made by casting from aqueous vesicle dispersions containing the protein. Vesicles are closed globular structures.

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