A conductive polymer based electronic nose for early detection of Penicillium digitatum in post-harvest oranges
Gruber, J.; Nascimento, H.M.; Yamauchi, E.Y.; Li, R.W.C.; Esteves, C.H.A.; Rehder, G.P.; Gaylarde, C.C.; Shirakawa, M.ár.A.
Materials Science and Engineering. C Materials for Biological Applications 33(5): 2766-2769
ISSN/ISBN: 1873-0191 PMID: 23623094 DOI: 10.1016/j.msec.2013.02.043
We describe the construction of an electronic nose, comprising four chemiresistive sensors formed by the deposition of thin conductive polymer films onto interdigitated electrodes, attached to a personal computer via a data acquisition board. This e-nose was used to detect biodeterioration of oranges colonized by Penicillium digitatum. Significant responses were obtained after only 24 h of incubation i.e. at an early stage of biodeterioration, enabling remedial measures to be taken in storage facilities and efficiently distinguishing between good and poor quality fruits. The instrument has a very low analysis time of 40 s.