title: Construction and comparison of Trametes versicolor laccase biosensors capable of detecting xenobiotics.
abstract: Amperometric biosensors using laccase from Trametes versicolor as a bioelement were developed for 2,4-dichloro phenoxy acetic acid (2,4-D). Laccase enzyme was immobilized by gelatin and glutaraldehyde onto a Clark oxygen probe and screen printed electrodes (SPEs). Amperometric and chronoamperometric measurements were carried out with the biosensors. First, the effect of laccase activity on the biosensor performances was investigated for both biosensors, and then optimum pH and temperature and also thermal stability of the biosensors were tested. In addition, the detection ranges of some phenolic compounds were obtained by the help of calibration graphs of them. In repeatability studies, variation coefficients and standard deviations for both biosensors were also calculated by the studies done for this purposes. Finally, the biosensors were applied to the determination of 2,4-D in a real herbicide sample.
authors.affiliation: Namik Kemal University, Faculty of Arts and Science, Chemistry Department, Tekirdağ, Turkey. msezginturk@hotmail.com
authors.forename: Mustafa Kemal
authors.initials: MK
authors.lastname: Sezgintürk
authors.forename: Dilek
authors.initials: D
authors.lastname: Odaci
authors.forename: Nurdan
authors.initials: N
authors.lastname: Pazarlioğlu
authors.forename: Roberto
authors.initials: R
authors.lastname: Pilloton
authors.forename: Erhan
authors.initials: E
authors.lastname: Dinçkaya
authors.forename: Azmi
authors.initials: A
authors.lastname: Telefoncu
authors.forename: Suna
authors.initials: S
authors.lastname: Timur
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000032:analysis; D015374:Biosensing Techniques / Q000379:methods*; D004563:Electrochemistry; D006540:Herbicides / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D042845:Laccase / Q000378:metabolism*; D016014:Linear Models; D010636:Phenols / Q000032:analysis / Q000737:chemistry; D013379:Substrate Specificity; D013696:Temperature; D055454:Trametes / Q000201:enzymology*; D014159:Transducers; D015262:Xenobiotics / Q000032:analysis*
chemical_list: D006540:Herbicides; D010636:Phenols; D015262:Xenobiotics; D015084:2,4-Dichlorophenoxyacetic Acid; D042845:Laccase