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Type: Artigo
Title: Differentiation Of Cocoa Nibs From Distinct Origins Using Comprehensive Two-dimensional Gas Chromatography And Multivariate Analysis
Author: Oliveira
Luciana F.; Braga
Soraia C. G. N.; Augusto
Fabio; Hashimoto
Juliana C.; Efraim
Priscilla; Poppi
Ronei J.
Abstract: Headspace solid-phase microextraction (HS-SPME) combined with comprehensive two-dimensional gas chromatography was used for identification of volatiles compounds responsible for differentiation between cocoa nibs from Brazil and Ivory Coast. The unfolded GC x GC with Flame Ionization Detector (FID) chromatograms were first aligned using the correlation optimization warping (COW) algorithm and normalized. After that, Fisher ratio was calculated for each variable, and a threshold value was chosen-to select the variables that best promote a separation of nibs samples from different sources in a principal component analysis (PCA) model. To identify the relevant compounds for the separation, representative samples of each source were analyzed in the same conditions by GC x GC with detection by quadrupole mass spectrometry. Finally, the average peak volumes for each key compound obtained for both classes were compared using a Student t-test and it was possible to identify 15 volatile compounds responsible for differentiation between cocoa nibs from Brazil and Ivory Coast. (C) 2016 Elsevier Ltd. All rights reserved.
Subject: Cocoa Nibs
Solid Phase Microextraction
Comprehensive Two-dimensional Gas Chromatography
Fisher Ratio
Principal Component Analysis
Editor: Elsevier Science BV
Rights: fechado
Identifier DOI: 10.1016/j.foodres.2016.10.047
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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