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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Explosive colorimetric discrimination using a smartphone, paper device and chemometrical approach

Full text
Author(s):
Salles, M. O. [1] ; Meloni, G. N. [1] ; de Araujo, W. R. [1] ; Paixao, T. R. L. C. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ANALYTICAL METHODS; v. 6, n. 7, p. 2047-2052, 2014.
Web of Science Citations: 50
Abstract

In this report we introduce a novel approach for an inexpensive and disposable colorimetric paper sensor array for the detection and discrimination of five explosives - triacetone triperoxide (TATP), hexamethylene triperoxide diamine (HMTD), 4-amino-2-nitrophenol (4A2NP), nitrobenzene (NB), and picric acid (PA). The colorimetric sensor comprised a disposable paper array fabricated using a wax printer and three reagents (KI, creatinine, and aniline) that produced a unique color pattern for each explosive based on chemical interactions between the explosive species and the chemical reagents. The analytes were discriminated from one another as per the color change profiles, which were readily distinguishable after 15 min, using hierarchical clustering analysis (HCA) and principal component analysis (PCA); there were no misclassifications in any of the trials conducted. The colorimetric pattern values were extracted using a smartphone, custom-made software and a closed chamber to circumvent the illumination problems commonly found in other paper approach devices. A semi-quantitative analysis was performed and it was possible to use as low as 0.2 mu g of explosives. (AU)

FAPESP's process: 11/11115-8 - Development of a hibrid tongue (electrochemistry and colorimetric) aiming the discrimination of forensic samples.
Grantee:Maiara Oliveira Salles
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/12106-5 - Development of intelligent devices (electronic noses and tongues) using electrochemical, colorimetric and mass measurements aiming to the discrimination of forensic and food samples
Grantee:Thiago Regis Longo Cesar da Paixão
Support Opportunities: Regular Research Grants
FAPESP's process: 11/19903-5 - Development of electroanalytical methods for detection/discrimination of drugs of abuse, its adulterants and explosives in forensic samples
Grantee:William Reis de Araujo
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)