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pH‐Switchable Redox Reactions and Bioelectrocatalytic Processes Using Au Nanoparticles‐Modified Electrodes
Author(s) -
Trifonov Alexander,
Yehezkeli Omer,
TelVered Ran,
Willner Itamar
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201300119
Subject(s) - phenylboronic acid , dithiothreitol , horseradish peroxidase , chemistry , redox , electrode , methylene blue , nanoparticle , reducing agent , nuclear chemistry , polymer chemistry , combinatorial chemistry , inorganic chemistry , organic chemistry , nanotechnology , materials science , catalysis , photocatalysis , enzyme
Boronate ester complexes generated between methylene blue (MB + )‐functionalized Au nanoparticles (NPs) and electrode surfaces are implemented to stimulate the bioelectrocatalyzed reduction of H 2 O 2 in the presence of horseradish peroxidase (HRP). Two kinds of Au NPs are prepared: Class I includes MB + /phenylboronic acid as a modifying layer, whereas Class II includes MB + /dithiothreitol as a mixed capping layer. The Class I or II NPs form boronate ester complexes with a dithiothreitol‐ or phenylboronic acid‐functionalized Au electrodes, respectively. By the cyclic loading of the NPs on the electrodes (pH 8.1), and the removal of the NPs (pH 1.5), switchable bioelectrocatalyzed reduction of H 2 O 2 is demonstrated.