@misc{PengWollenbergerKinneetal., author = {Peng, Lei and Wollenberger, Ulla and Kinne, Matthias and Hofrichter, Martin and Ullrich, Ren{\´e} and Scheibner, Katrin and Fischer, Anna and Scheller, Frieder W.}, title = {Peroxygenase based sensor for aromatic compounds}, series = {Biosensors and Bioelectronics}, volume = {26}, journal = {Biosensors and Bioelectronics}, number = {4}, issn = {1873-4235}, doi = {10.1016/j.bios.2010.07.075}, url = {http://nbn-resolving.de/http://www.sciencedirect.com/science/article/pii/S0956566310004501}, pages = {1432 -- 1436}, abstract = {We report on the redox behaviour of the peroxygenase from Agrocybe aegerita (AaeAPO) which has been electrostatically immobilized in a matrix of chitosan-embedded gold nanoparticles on the surface of a glassy carbon electrode. AaeAPO contains a covalently bound heme-thiolate as the redox active group that exchanges directly electrons with the electrode via the gold nanoparticles. The formal potential E ° ′ of AaeAPO in the gold nanoparticles-chitosan film was estimated to be -(286 ± 9) mV at pH 7.0. The heterogeneous electron transfer rate constant (ks) increases from 3.7 in the scan rate range from 0.2 to 3.0 V s-1 and level off at 63.7 s-1. Furthermore, the peroxide-dependent hydroxylation of aromatic compounds was applied to develop a sensor for naphthalene and nitrophenol. The amperometric measurements of naphthalene are based on the indication of H2O2 consumption. For the chitosan-embedded gold nanoparticle system, the linear range extends from 4 to 40 μM naphthalene with a detection limit of 4.0 μM (S/N = 3) and repeatability of 5.7\% for 40 μM naphthalene.}, language = {en} }