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  Chemical Sensors 2011, 1: 11
  Research Article
Development of thickness shear mode biosensor based on DNA aptamers for detection ochratoxin A
  I. Lambertia, L. Mosiellob, T. Hianikc  
a Universirìty of RomaTre Department of Biology Viale Marconi 446 00149 Roma, Italy
b ENEA, Italian National Agency for New Technologies,Energy and the Environment Via Anguillarese 301, 00060 Rome, Italy
c Department of Nuclear Physics and Biophysics, Comenius University, Mlynska dolina F1, 842 48 Bratislava, Slovakia

  We developed aptamers based biosensor for label-free detection of ochratoxin A (OTA) using thickness shear mode acoustic method (TSM). This method is sensitive to mass adsorbed at the sensor surface, measured by changes of resonant frequency, fs, and to the viscoelastic contribution, measured by motional resistance, Rm. Addition of OTA to a sensor surface with immobilised biotinylated DNA aptamers resulted in decrease of fs and increase of Rm. We were able to detect OTA with limit of detection of 30 nM and determined the equilibrium dissociation constant KD=43.9±30 nM. The OTA interacted with aptamer only in the presence of calcium ions. Therefore binding studies were performed in the presence of 20 mM Ca2+. No significant changes of fs and Rm were observed without calcium. We analyzed also changes of acoustic parameters in the presence of possible interference N-acetyl-L-phenylalanine (NAP). Addition of NAP in a concentration range 25-740 nM resulted similar frequency changes like that induced by OTA, however significant but much lower changes of motional resistance were observed only at the highest NAP concentration analyzed (740 nM).
  Ochratoxin A; DNA aptamers; Thickness Shear Mode acoustic method; Biosensor  

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