| Full text | |
| Author(s): |
Braunger, Maria L.
;
Shimizu, Flavio M.
;
Jimenez, Mawin J. M.
;
Amaral, Lucas R.
;
de Oliveira Piazzetta, Maria H.
;
Gobbi, Angelo L.
;
Magalhaes, Paulo S. G.
;
Rodrigues, Varlei
;
Oliveira, Jr., Osvaldo N.
;
Riul, Jr., Antonio
Total Authors: 10
|
| Document type: | Journal article |
| Source: | CHEMOSENSORS; v. 5, n. 2 JUN 2017. |
| Web of Science Citations: | 5 |
| Abstract | |
Precision agriculture is crucial for increasing food output without expanding the cultivable area, which requires sensors to be deployed for controlling the level of nutrients in the soil. In this paper, we report on a microfluidic electronic tongue (e-tongue) based on impedance measurements which is capable of distinguishing soil samples enriched with plant macronutrients. The e-tongue setup consisted of an array of sensing units made with layer-by-layer films deposited onto gold interdigitated electrodes. Significantly, the sensing units could be reused with adequate reproducibility after a simple washing procedure, thus indicating that there is no cross-contamination in three independent sets of measurements. A high performance was achieved by treating the capacitance data with the multidimensional projection techniques Principal Component Analysis (PCA), Interactive Document Map (IDMAP), and Sammon's Mapping. While an optimized performance was demonstrated with IDMAP and feature selection, during which data of a limited frequency range were used, the distinction of all soil samples was also possible with the well-established PCA analysis for measurements at a single frequency. The successful use of a simple microfluidic e-tongue for soil analysis paves the way for enhanced tools to support precision agriculture. (AU) | |
| FAPESP's process: | 14/03691-7 - Fabrication of microfluidic devices envisanging aplications in precision agriculture and bioenergy |
| Grantee: | Antonio Riul Júnior |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Regular Program Grants |
| FAPESP's process: | 13/14262-7 - Nanostructured films from biologically-relevant materials |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/50942-2 - Applied multispectral reflectance spectroscopy for prediction of soil chemical properties to use in sugarcane precision agriculture |
| Grantee: | Paulo Sergio Graziano Magalhães |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Regular Program Grants |
| FAPESP's process: | 12/15543-7 - Biosensors to detect Escherichia coli using the concept of an extended electronic tongue |
| Grantee: | FLAVIO MAKOTO SHIMIZU |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 15/14836-9 - 3D printing technology application for microfluidic developments |
| Grantee: | Maria Luisa Braunger Fier |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |