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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization for didodecyldimethylammonium bromide liquid crystal film entrapping catalase with enhanced direct electron transfer rate.

Direct electrochemistry for catalase (CAT) embedded in the liquid crystal film of didodecyldimethylammonium bromide (DDAB) was investigated at pyrolytic graphite (PG) electrode by voltammetric methods. The reduction reaction involved the redox couple in CAT, i.e. FeIII/FeII couple. The electron transfer between the incorporated CAT and PG electrode was found to be greatly enhanced by DDAB. The heterogeneous electron transfer rate constant k(s) was fitted as 3.0 +/- 0.4 s(-1) using the nonlinear regression analysis of the square wave voltammograms at a series of pulse heights. The pH dependence of the formal potential for CAT in DDAB film was 57 mV/pH, which suggested one-proton-transfer together with a one-electron reaction. Visible absorption and reflectance-absorbance infrared (RAIR) spectra inferred the similar heme environment of CAT in DDAB film to its native status. Circular dichroism (CD) results indicated DDAB affected slightly on the second structure of CAT.[1]


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