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Open AccessCommunication

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.
Sensors 2007, 7(7), 1317-1322;
Received: 10 July 2007 / Accepted: 24 July 2007 / Published: 25 July 2007
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. View Full-Text
Keywords: amorphous silicon; photosensor; mycotoxin detection; ochratoxin A. amorphous silicon; photosensor; mycotoxin detection; ochratoxin A.
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.

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