New PDF release: Biomolecular Films Design Function and Applications

By James F. Rusling

ISBN-10: 0824708997

ISBN-13: 9780824708993

Examines motion pictures of biomolecules which can offer good surfaces for catalyzing enzyme reactions, serve in biosensors and as biorecognition parts, mediate nanoparticle formation, and supply a easy for primary reports and functions in biomedical units.

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Catalytic electrochemical oxidation of DNA using transition metal complexes provides enhanced electrochemical signals [10]. Elegant work by Thorp et al. showed that Ru(bpy)2þ 3 is a very e⁄cient electrochemical catalyst that oxidizes only guanine bases in DNA and oligonucleotides [73,74]. The reaction follows the typical catalytic pathway in Scheme 5, and 3þ À RuðbpyÞ2þ 3 ¼ RuðbpyÞ3 þ e 2þ þ RuðbpyÞ3þ 3 þ DNAðguanineÞ ! RuðbpyÞ3 þ DNAðguanine Þ ð17Þ ð18Þ SCHEME 5 DNA(guanineþ ) is subsequently further oxidized [75].

For details,we refer the reader to recent reviews [66,78], and to the original literature cited therein. The method has been used for many kinetic, mechanistic, and H=D isotope studies of catalysis by native and mutant enzymes [66,85À87]. The most recent studies of thin protein monolayers by voltammetry demonstrate increasingly sophisticated mechanistic resolving power. Examples include low-temperature protein ¢lm cryovoltammetry to resolve complex transformations in ferredoxin electron transfer [88], and elucidation of an atomically resolved long-range electron-coupled proton transfer in a buried protein redox center [89].

This work pre¢gured the use of metalloproteinÀsurfactant ¢lms on electrodes for voltammetry. Polymer-stabilized surfactant ¢lms can be made by replacing the counterions of the surfactants with ionic polymers in the casting solutions [147À149]. For example, bromide in DDAB (Fig. 14) can be replaced with polystyrene sulfonate, and the ¢lm can be cast from the resulting surfactantÀpolymer conjugate. Films are structured in multiple bilayers (cf. Fig. 15), with polyions associated with head groups.

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Biomolecular Films Design Function and Applications by James F. Rusling


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