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Sensors 2007, 7(7), 1317-1322; doi:10.3390/s7071317

Innovative Detection System of Ochratoxin A by Thin Film Photodiodes

1,* , 1
1 Department of Electronic Engineering, University “La Sapienza”, via Eudossiana, 18 00184 Rome (Italy) 2 Department of Plant Biology, University “La Sapienza”, Largo Cristina di Svezia, 24 00165 Rome (Italy) 3 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
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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. amorphous silicon; photosensor; mycotoxin detection; ochratoxin A.
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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