Application of VIS/NIR spectroscopy for estimating chemical, physical and mechanical properties of cork stoppers

Prades, Cristina; Gómez-Sánchez, Isabel; García-Olmo, Juan; González-Hernández, F. M.; González-Adrados, José Ramón

doi:10.1007/s00226-014-0642-3

Cited by 18 publications

(14 citation statements)

References 43 publications

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“…However, Prades et al. (2012, 2014) assigned the 2300–2360 nm region to CH combination bands of antisymmetric and symmetric stretching plus one deformation mode in the CH and CH 2 structures. Workman and Weyer (2008) assigned the 2310 nm band to the 2 nd overtone of C–H fundamental bending due to lipids, and the 2349 nm band to the functional group of C–H methylene C–H, associated with linear aliphatic R(CH 2 ) N R, due to aliphatic hydrocarbons as representative of cork suberin chemical structure (Pereira, 2007).…”

Section: Resultsmentioning

confidence: 99%

Chemical characterization of cork, phloem and wood from different Quercus suber provenances and trees

Costa

Lourenço

Oliveira

et al. 2019

Heliyon

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Sustainability of cork oak (Quercus suber) forests is threatened by biotic and abiotic factors and characterization of potentially differing genetic resources has therefore gained importance. This work addresses the chemical variation of the three tissues of cork oak stems – cork, phloem and wood – in relation to tree and provenance, looking for genetic chemical diversity and for physiological derived differences. The three tissues differ with cork clearly differentiating regarding summative composition, component ratios and monomeric composition. Cork is the only tissue where suberin is present (42.3% o.d. mass) as the main cell wall component, and it has a high content of extractives (11.7%) with significant proportion of lipophilic compounds. Phloem is more lignified than wood (38.0% vs. 23.4%) and has less polysaccharides (49.1% vs. 64.6%) with glucose-to-other sugars relation of 1:1.3 in phloem and 1:0.7 in wood. Analytical pyrolysis showed that lignification is a heterogeneous process and the lignin monomeric composition depends on tissue and cell type: cork lignin has a H:G:S ratio of 1:2.5:0.3 and S/G ratio of 0.12, while phloem and wood lignins have mainly G and S units with a S/G ratio of respectively 1.1 and 2.3. No significant differences were found between the three provenances, but some chemical variation occurred between the trees within a provenance. NIR spectroscopy and principal component analysis differentiated cork, phloem and wood, while the dispersion within each group highlighted the significant tree variability, while provenances were a non-significant factor of chemical variation.

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Section: Resultsmentioning

confidence: 99%

Chemical characterization of cork, phloem and wood from different Quercus suber provenances and trees

Costa

Lourenço

Oliveira

et al. 2019

Heliyon

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“…16 Later, NIRS was used to predict the geographical origin of cork stoppers combined with visible spectroscopy (Vis) and multivariate analysis, using samples from Portugal, Morocco, and Spain, in the last case in three geographical areas (Andalusia, Extremadura, and Catalonia). 17 This report discriminated cork planks with a 5% error and cork stoppers with a 10% error, with the most important absorption bands (1200, 1450, 1730, 1930, and 2140 nm) for discrimination assigned, but no correlation was achieved with the components or characteristics that explain the classification by origin. Following this report, Vis/NIRS spectroscopy was applied to study the chemical composition and physical and mechanical parameters of cork stoppers, and promising models (SEP 1.13%, R EV 2 = 0.55) were obtained to predict total polyphenols constructed by MPLS.…”

Section: ■ Introductionmentioning

confidence: 70%

Variation in the Phenolic Composition of Cork Stoppers from Different Geographical Origins

Reis

Teixeira

Pinto

et al. 2020

J. Agric. Food Chem.

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Cork stopper granulates from five geographical origins from Portugal and six from Spain were analyzed regarding polyphenol composition by HPLC-DAD/ESI-MS and geographical discrimination studied by near-infrared spectroscopy (NIRS). The phenolic composition of the eleven origins ranged from 30 to 52 mg/g cork granulates, with vescavaloninic acid, castalagin, sanguisorbic acid dilactone, vescalagin, castavaloninic acid, dehydrated tergallic-C-Glc, and ellagic acid being the major compounds. NIRS revealed to be a powerful tool to discriminate origins and predict the concentration of polyphenols. However, polyphenols do not fully explain the discrimination of geographical origins. Variability in the polyphenol composition of cork stoppers is not significantly influenced by geographical location but probably may be more related to the plant genetics, tree age, and phytosanitary and edaphoclimatic conditions.

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“…Error of prediction and correlation coefficients of models based on natural and thermally treated wood (Table 4) showed the potential application of NIR and visible spectra to predict lignin, holocellulose and total extractives of Eucalyptus grandis and Pinus taeda wood, both natural and thermally modified at 160 °C. Literature report prediction of chemical properties based on near infrared spectra (Karlinasari et al 2014, Via et al 2014 and the influence of sample preparation (Hein et al 2009), but analyses of visible spectra are scarce (Prades et al 2014).…”

Section: Spectral Analysismentioning

confidence: 99%

Potential use of nir and visible spectroscopy to analyze chemical properties of thermally treated wood

Lengowski

Muñiz²,

Klock

et al. 2018

Maderas, Cienc. tecnol.

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The modification of wood by thermal treatments produces characteristic changes in its chemical composition and surface color and can improve the structural and esthetic quality. The objective of this paper is to evaluate the potential of near infrared and visible spectroscopy to predict the modifications in chemical composition of Eucalyptys grandis and Pinus taeda after thermal treatment. Near infrared and visible spectra were collected directly on the longitudinal surface of wood samples. The thermally modified wood of both species showed higher content of lignin and extractives than the untreated wood. There was darkening of thermally modified wood, as a result of chemical modification caused by heat. The Near infrared/visible technique identified the groups that were modified by treatment. NIR and visible spectroscopy can be used to predict chemical composition of natural or thermally treated Eucalyptus grandis and Pinus taeda.

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Application of VIS/NIR spectroscopy for estimating chemical, physical and mechanical properties of cork stoppers

Cited by 18 publications

References 43 publications

Chemical characterization of cork, phloem and wood from different Quercus suber provenances and trees

Chemical characterization of cork, phloem and wood from different Quercus suber provenances and trees

Variation in the Phenolic Composition of Cork Stoppers from Different Geographical Origins

Potential use of nir and visible spectroscopy to analyze chemical properties of thermally treated wood

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