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Innovative Detection System of Ochratoxin A by Thin Film Photodiodes
Department of Electronic Engineering, University “La Sapienza”, via Eudossiana, 18 00184 Rome (Italy)
Department of Plant Biology, University “La Sapienza”, Largo Cristina di Svezia, 24 00165 Rome (Italy)
CNR, Institute of Science of Food Production, via G. Amendola, 122/O, 70126 Bari (Italy)
* Author to whom correspondence should be addressed.
Received: 10 July 2007; Accepted: 24 July 2007 / Published: 25 July 2007
Abstract: In this work we present, for the first time, a rapid, compact and innovativemethod for detection of Ochratoxin A (OTA) based on hydrogenated amorphous silicon (a-Si:H) sensors. 2 μl of acidified toluene containing OTA at different concentrations werespotted on the silica side of a High Performance Thin Layer Cromatography plate andaligned with a a-Si:H p-i-n photodiode deposited by Plasma Enhanced Chemical VaporDeposition on a different glass substrate. As an UV radiation excites the mycotoxin, the re-emitted light is detected by the a-Si:H sensor. Results show a very good linearity betweenOTA concentration and the sensor photocurrent over almost three orders of magnitude. Theminimum detected OTA concentration is equal to 0.1ng, showing that the presented systemhas the potential for a low cost system suitable for the early detection of toxins in foods.
Keywords: amorphous silicon; photosensor; mycotoxin detection; ochratoxin A.
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MDPI and ACS Style
Caputo, D.; De Cesare, G.; Fanelli, C.; Nascetti, A.; Ricelli, A.; Scipinotti, R. Innovative Detection System of Ochratoxin A by Thin Film Photodiodes. Sensors 2007, 7, 1317-1322.
Caputo D, De Cesare G, Fanelli C, Nascetti A, Ricelli A, Scipinotti R. Innovative Detection System of Ochratoxin A by Thin Film Photodiodes. Sensors. 2007; 7(7):1317-1322.
Caputo, Domenico; De Cesare, Gianpiero; Fanelli, Corrado; Nascetti, Augusto; Ricelli, Alessandra; Scipinotti, Riccardo. 2007. "Innovative Detection System of Ochratoxin A by Thin Film Photodiodes." Sensors 7, no. 7: 1317-1322.