By James F. Rusling
Examines movies of biomolecules that may offer stable surfaces for catalyzing enzyme reactions, serve in biosensors and as biorecognition parts, mediate nanoparticle formation, and supply a easy for basic experiences and purposes in biomedical units.
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Extra resources for Biomolecular Films Design Function and Applications
Here an LB lipid ¢lm is formed at the airÀwater interface in an LB ¢lm balance, and transferred to an electrode by controlled dipping and extraction. Yokoto et al. reported direct, chemically reversible voltammetry for cyt c on a phosphatidylcholine layer on an ITO electrode . Multilayer ¢lms can also be constructed on electrodes by LB transfer methods. Reversible CV for Mb was found in multilayer ¢lms of a variety of synthetic insoluble lipids made in this way . However, LB ¢lm transfer is tedious and impractical for biosensor or bioreactor development.
The most complex protein studied in lipid ¢lms has probably been the very large reaction center protein (RC) from the purple bacterium Rhodobacter sphaeroides, which contains multiple bound redox cofactors. Cyclic voltammetry of thin ¢lms made from RC and dimyristoylphosphatidyl Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved. 17 V versus NHE . The reduction peak disappeared for RCs with the quinones removed, suggesting that this peak represents reduction of quinone cofactors. The oxidation peak showed a catalytic current increase in the presence of ferrous cytochrome c, and decreased by 85% when illuminated by visible light, suggesting assignment to the primary electron donor cofactor which should display these features.
This soluble polycation can be added to solutions to facilitate co-adsorption of negatively charged proteins on electrodes. For example, proton reduction catalyzed by the negative hydrogenase was studied in this way at a pyroly¢c graphite (PG) electrode [112,113]. Catalytic peaks for the reduction of protons to hydrogen were found. Carboxyalkylthiol SAMs on Au were used to ¢rst adsorb poly(lysine), with subsequent adsorption of the negatively charged cytochrome b5 to obtain reversible voltammetry .