Innovative Detection System of Ochratoxin A by Thin Film Photodiodes

Sensors

Domenico Caputo²  Giampiero de Cesare²  Corrado Fanelli³  Augusto Nascetti²  Alessandra Ricelli¹ 

[1] CNR, Institute of Science of Food Production, via G. Amendola, 122/O, 70126 Bari (Italy). E-mail:;Department of Electronic Engineering, University “La Sapienza”, via Eudossiana, 18 00184 Rome (Italy). Phone: [phone]; Fax: [phone];Department of Plant Biology, University “La Sapienza”, Largo Cristina di Svezia, 24 00165 Rome (Italy). E-mail:

关键词: amorphous silicon;    photosensor;    mycotoxin detection;    ochratoxin A;   

DOI  :  10.3390/s7071317

来源: mdpi

【 摘 要 】

In this work we present, for the first time, a rapid, compact and innovative method 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 were spotted on the silica side of a High Performance Thin Layer Cromatography plate and aligned with a a-Si:H p-i-n photodiode deposited by Plasma Enhanced Chemical Vapor Deposition 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 between OTA concentration and the sensor photocurrent over almost three orders of magnitude. The minimum detected OTA concentration is equal to 0.1ng, showing that the presented system has the potential for a low cost system suitable for the early detection of toxins in foods.

【 授权许可】

Unknown   
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