Quantitative assessment of total phenol contents of European oak (Quercus petraea and Quercus robur) by diffuse reflectance NIR spectroscopy on solid wood surfaces

Zahri Sofia, Moubarike Amine, Charrier Fatima, Chaix Gilles, Baillères Henri, Nepveu Gérard, Charrier Bertrand. 2008. Quantitative assessment of total phenol contents of European oak (Quercus petraea and Quercus robur) by diffuse reflectance NIR spectroscopy on solid wood surfaces. Holzforschung, 62 (6) : 679-687.

Résumé : Near infrared spectroscopy (NIRS) combined with multivariate analysis techniques was applied to assess phenol content of European oak. NIRS data were firstly collected directly from solid heartwood surfaces: in doing so, the spectra were recorded separately from the longitudinal radial and the transverse section surfaces by diffuse reflectance. The spectral data were then pretreated by several pre-processing procedures, such as multiplicative scatter correction, first derivative, second derivative and standard normal variate. The tannin contents of sawmill collected from the longitudinal radial and transverse section surfaces were determined by quantitative extraction with water/methanol (1:4, by vol). Then, total phenol contents in tannin extracts were measured by the Folin-Ciocalteu method. The NIR data were correlated against the Folin-Ciocalteu results. Calibration models built with partial least squares regression displayed strong correlation - as expressed by high determination correlation coefficient (r2) and high ratio of performance to deviation (RPD) - between measured and predicted total phenols content, and weak calibration and prediction errors (RMSEC, RMSEP). The best calibration was provided with second derivative spectra (r2 value of 0.93 for the longitudinal radial plane and of 0.91 for the transverse section plane). This study illustrates that the NIRS technique when used in conjunction with multivariate analysis could provide reliable, quick and non-destructive assessment of European oak heartwood extractives.

Mots-clés Agrovoc : Quercus petraea, teneur en phénols, bois, spectroscopie infrarouge, technique analytique, mesure (activité)

Classification Agris : K50 - Technologie des produits forestiers
U30 - Méthodes de recherche

Champ stratégique Cirad : Hors axes (2005-2013)

Auteurs et affiliations

• Zahri Sofia, UPPA (FRA)
• Moubarike Amine, UPPA (FRA)
• Charrier Fatima, UPPA (FRA)
• Chaix Gilles, CIRAD-BIOS-UPR Génétique forestière (FRA) ORCID: 0000-0003-2015-0551
• Baillères Henri, CIRAD-PERSYST-UPR Bois tropicaux (AUS)
• Nepveu Gérard, INRA (FRA)
• Charrier Bertrand, UPPA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/546834/)

Métriques

[ Page générée et mise en cache le 2024-04-06 ]