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Type: Artigo
Title: Environmental stress evaluation of Coffea arabica L. leaves from spectrophotometric fingerprints by PCA and OSC-PLS-DA
Author: Scheel, Guilherme Luiz
Pauli, Elis Daiane
Rakocevic, Miroslava
Bruns, Roy Edward
Scarminio, Ieda Spacino
Abstract: The effects of hydric stress and sunlight access conditions on metabolic compounds in coffee leaves were investigated utilizing statistical mixture design extractor solvents. PCA and OSC-PLS-DA chemometric methods were used to analyze UV-visible spectra of irrigated and non-irrigated Coffea arabica L. leaves from low (<40 cm, self-shaded) and higher (>80 cm, light exposed) strata. The first latent variable of the OSC-PLS-DA score plot perfectly discriminated extracts of 34 calibration and 14 validation samples of irrigated and non-irrigated leaves. Higher spectral signals observed at the 410, 505, 535, 607 and 665 nm wavelengths are attributed to conjugate double bond pigments, mainly pheophytin a, indicating that non-irrigated conditions are more stressful than irrigated ones for this species. No significant difference was found for leaf sample extracts with varying light access conditions
Subject: Coffea arabica
Country: Holanda
Editor: Elsevier
Rights: Aberto
Identifier DOI: 10.1016/j.arabjc.2016.05.014
Date Issue: 2019
Appears in Collections:IQ - Artigos e Outros Documentos

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