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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 G.L.
Pauli E.D.
Rakocevic M.
Bruns R.E.
Scarminio I.S.
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. © 2016 The Authors.
Subject: Coffea Arabica L. Leaves
Hydric Stress
Mixture Design
Editor: Elsevier B.V.
Rights: fechado
Identifier DOI: 10.1016/j.arabjc.2016.05.014
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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