Evaluation of the potential of FTIR and chemometrics for separation between defective and non-defective coffees

Ana Paula Craig; Adriana S Franca; Leandro S Oliveira

doi:10.1016/j.foodchem.2011.11.121

Evaluation of the potential of FTIR and chemometrics for separation between defective and non-defective coffees

Food Chem. 2012 Jun 1;132(3):1368-1374. doi: 10.1016/j.foodchem.2011.11.121. Epub 2011 Dec 6.

Authors

Ana Paula Craig¹, Adriana S Franca², Leandro S Oliveira³

Affiliations

¹ Programa de Pós-Graduação em Ciência de Alimentos/UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil.
² Programa de Pós-Graduação em Ciência de Alimentos/UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil; Departamento de Engenharia Mecânica/UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil. Electronic address: adriana@demec.ufmg.br.
³ Programa de Pós-Graduação em Ciência de Alimentos/UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil; Departamento de Engenharia Mecânica/UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil.

PMID: 29243624
DOI: 10.1016/j.foodchem.2011.11.121

Abstract

The objective of this work was to evaluate the potential of Fourier transform infrared spectroscopy (FTIR) for the discrimination of defective and non-defective coffee beans. Defective (black, immature and sour) and non-defective Arabica coffee beans were submitted to FTIR analysis by transmittance readings employing KBr discs and reflectance readings employing attenuated total reflectance (ATR) and diffuse reflectance (DR) accessories. Multivariate statistical analysis (PCA, clusters) was performed in order to verify the possibility of discrimination between defective and non-defective coffee samples. A clear separation between defective and non-defective coffee beans was observed, based on both PCA and cluster analysis of the reflectance spectra (ATR and DR accessories) and of the first derivatives of the transmittance spectra (KBr discs). Such results indicate that FTIR analysis has the potential for the development of a fast and reliable analytical methodology for the discrimination between defective and non-defective coffee beans.

Keywords: ATR; Coffee; DRIFTS; FTIR.