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By using sarcosine oxidase (SOD), the photocurrent can be suppressed because of biocatalytic oxygen reduction. For the construction of a sensor, SOD is immobilised on the QDs by means of the polyelectrolyte poly(allylamine hydrochloride) (PAH). Multi\u2010layer systems have been built up to six bilayers through electrostatic interactions. The assembly can be verified by surface plasmon resonance measurements. By varying the number of layers, the influence of the amount of enzyme on the sensitivity of the sensor can be shown. The [SOD\/PAH]<jats:sub>6<\/jats:sub>\u2010layer system results in a signal change of 0.041\u2009%\u2009\u03bc<jats:sc>M<\/jats:sc><jats:sup>\u22121<\/jats:sup> in the linear range from 100 \u03bc<jats:sc>M<\/jats:sc> to 1 m<jats:sc>M<\/jats:sc> of sarcosine.<\/jats:p>","DOI":"10.1002\/cphc.201201036","type":"journal-article","created":{"date-parts":[[2013,4,15]],"date-time":"2013-04-15T14:08:55Z","timestamp":1366034935000},"page":"2338-2342","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Photoelectrochemical Sensor Based on Quantum Dots and Sarcosine Oxidase"],"prefix":"10.1002","volume":"14","author":[{"given":"Marc","family":"Riedel","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gero","family":"G\u00f6bel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Abuelmagd M.","family":"Abdelmonem","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wolfgang J.","family":"Parak","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fred","family":"Lisdat","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,4,15]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1116\/1.1600444"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.bios.2011.09.003"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200800169"},{"key":"e_1_2_6_3_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200800169"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1088\/0022-3727\/39\/21\/R01"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2005.01.030"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1039\/c2jm16427b"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1002\/adma.200390087"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.copbio.2004.11.003"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1088\/0957-4484\/16\/2\/R01"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.281.5385.2013"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1021\/jp074609z"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1021\/ac035083r"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.281.5385.2016"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1021\/nl0709930"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1002\/smll.200500441"},{"key":"e_1_2_6_16_2","first-page":"332","volume-title":"Bioelectronics","author":"Katz E.","year":"2005"},{"key":"e_1_2_6_17_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.aca.2010.05.026"},{"key":"e_1_2_6_18_2","doi-asserted-by":"publisher","DOI":"10.1007\/s002160000409"},{"key":"e_1_2_6_19_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.bb.23.060194.000511"},{"key":"e_1_2_6_20_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ymeth.2005.05.020"},{"key":"e_1_2_6_21_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.bios.2008.03.039"},{"key":"e_1_2_6_22_2","doi-asserted-by":"publisher","DOI":"10.1039\/b517332a"},{"key":"e_1_2_6_23_2","doi-asserted-by":"publisher","DOI":"10.1002\/smll.201100608"},{"key":"e_1_2_6_24_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1104274"},{"key":"e_1_2_6_25_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.1328771"},{"key":"e_1_2_6_26_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma970626i"},{"key":"e_1_2_6_27_2","first-page":"35","volume":"303","author":"Mason J. 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