Evaluation of Lignin Syringyl/Guaiacyl Ratio in <i>Eucalyptus Camaldulensis</i> across Three Diverse Sites Based on near Infrared Spectroscopic Calibration Modelling with Five <i>Eucalyptus</i> Species and its Impact on Kraft Pulp Yield

Ramadevi, Payyavula; Hegde, Deepak V.; Varghese, M.; Kamalakannan, R.; Ganapathy, Suraj P.; Gurumurthy, D. S.

doi:10.1255/jnirs.1251

Cited by 25 publications

(17 citation statements)

References 21 publications

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“…Thioacidolysis involves the solvolysis of the extractive-free material in dioxane/ethanediol (9/1) containing boron trifluoride etherate [43,44]. The reaction depolymerizes part of the lignin and the released monomers can be analyzed, e.g., by GC-MS allowing to estimate the amount and composition of uncondensed alkyl ether structures [43].…”

Section: Thioacidolysismentioning

confidence: 99%

“…NIRS has been successfully applied to evaluate different features of lignocellulosic materials [73,74]. For instance, it was used to estimate Klason lignin content in E. camaldulensis and L. leucocephala wood [75], and lignin composition in maritime pine wood [76], and in E. camaldulensis and E. urophylla wood [44] by screening the H/G and S/G ratios, respectively.…”

Section: Near-infrared Spectroscopy (Nirs)mentioning

confidence: 99%

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Compositional Variability of Lignin in Biomass

Lourenço¹,

Pereira²

2018

Lignin - Trends and Applications

103

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The objective of this chapter is to provide a concise overview of lignin composition and structure in different species and materials (wood, barks and nonwood plants). It includes a brief review on the lignin precursors and their polymerization as well as of the analytical tools used for lignin characterization from wet chemical to spectroscopic methods. Wood of gymnosperms is characterized by high lignin content (25-35%) and a HG-type of lignin with more guaiacyl (G) units and a small portion of p-hydroxyphenyl (H) units. Wood of angiosperms has a lignin content of 15-28%, with a GS-lignin having different proportions of syringyl (S) units. Nonwoody monocotyledon species have different lignin content (9-20%) and a HGS type of lignin, characterized by a high proportion of H units. Bark lignin content ranges from 13 to 43% and is of HGS-type with species-specific composition and different in the bark components, phloem and cork. Lignin composition and macromolecular structure are key issues to understand the properties of lignocellulosic materials and to design a lignin-based pathway within biomass biorefineries. The available information on lignin composition is still limited to a few species and plant components. This is certainly an area where more research is needed.

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Section: Thioacidolysismentioning

confidence: 99%

Section: Near-infrared Spectroscopy (Nirs)mentioning

confidence: 99%

Compositional Variability of Lignin in Biomass

Lourenço¹,

Pereira²

2018

Lignin - Trends and Applications

103

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“…O modelo matemático de lignina Klason apresentou alta correlação (Figura 2A) demonstrando seu potencial de utilização na predição de amostras desconhecidas. Altos valores de R ² , como bem mencionado por Ramadevi et al (2016), implicam em maior correlação com os valores da reta obtida, indicando maior ajuste entre os métodos laboratoriais e as análises em NIRS.…”

Section: Calibração Dos Modelos Nirsunclassified

Modelos NIRS para as características químicas da madeira de Eucalyptus benthamii Maiden & Cambage

et al. 2020

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A espectroscopia no infravermelho próximo (Near Infrared Spectroscopy, NIRS) é uma técnica não destrutível, rápida e acurada, aplicável em muitas amostras e tem se mostrado como uma ferramenta eficiente na determinação das propriedades químicas, anatômicas, físicas e mecânicas da madeira. O objetivo deste estudo foi desenvolver modelos de calibração NIRS para as características químicas da madeira de Eucalyptus benthamii. Para o desenvolvimento dos modelos de calibração toretes de 87 árvores, sendo 75 de E. benthamii, quatro de E. dunnii, quatro de E. grandis e quatro de E. saligna foram transformadas em cavacos. Parte deste material serviu para as análises de cinzas, extrativos, lignina total e Klason e holocelulose, outra parte foi moída para aquisição dos espectros, que posteriormente foram correlacionados aos valores laboratoriais. A calibração do modelo foi determinada por análise de regressão dos mínimos quadrados parciais (PLS). A seleção dos modelos foi tomada com base nos critérios estatísticos de coeficiente de determinação (R²), erro médio da validação cruzada (RMSECV), desvio residual de previsão (RPD) e do número de variáveis latentes (VLs). A composição química da madeira de E. benthamii corrobora os resultados evidenciados na literatura para os eucaliptos. Os modelos de calibração apresentaram ajustes satisfatórios para o teor de holocelulose (R2=0,82), lignina total (R2=0,74) e lignina Klason (R2=0,82) e a sua utilização comercial é recomendada para predição de amostras desconhecidas. A técnica NIRS se mostrou promissora para predizer a qualidade da madeira de Eucalyptus benthamii para a indústria de celulose.

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“…10 Eucalyptus wood lignin contains syringyl (S) and guaiacyl (G) monomers 11 and the higher syringyl to guaiacyl (S/G) ratio, the cheaper it is to remove lignin from the pulp to produce high quality fiber and paper. 11,12 Besides high-volume wood productivities, one of the main targets of eucalypt breeding programs is to increase the S/G ratio to reduce processing costs and enhance the quality of end-products. 13 Measuring wood properties in large numbers of individuals sampled in progeny and clonal trials along breeding programs is a laborious and expensive endeavor.…”

Section: Introductionmentioning

confidence: 99%

Comparative performance of bench and portable near infrared spectrometers for measuring wood samples of two Eucalyptus species (E. pellita and E. benthamii)

Diniz

Grattapaglia

Figueiredo

2019

Proceedings of the 18th International Conference on Near Infrared Spectroscopy

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The well-established and ever-growing applications of near infrared (NIR) spectroscopy for wood science and technology using bench spectrometers is unquestionable. However, the increasing interest in using portable spectrometers due to their perceived advantages raises the question of how good are they? In this work, we acquired spectra from wood sawdust samples of two Eucalyptus species, E. pellita and E. benthamii, totaling 1200 individual trees sampled in experimental breeding populations. Spectra were acquired in parallel using a bench spectrometer (FOSS NIRSystems 5000) and a portable instrument (Viavi MicroNIR1700). Spectra acquisition on the bench spectrometer had a longer wavelength (1100-2500 nm versus 908-1700 nm) and a shorter absorbance profile. Principal component analysis on the spectral data of both instruments was not able to clearly separate the two species suggesting some level of overlapping distributions of the chemical composition of their respective wood properties. Linear discriminant analysis, however, had excellent accuracies with the bench spectrometer (~99 %), showing significantly better discrimination than the one obtained with the portable one (~93 %).Similarly, partial least square discriminant analysis showed correlations (r) around 0.96 and standard errors of calibration (SEC) and of cross validation (SECV) lower than 0.155 on the bench instrument, while the portable spectrometer had r ~ 0.88 with SEC and SECV below 0.235. Although the bench instrument showed a better performance, the parameters estimated with the portable spectrometer were very satisfactory given its intrinsic limitations in robustness and handling needs. Chemical analyses for lignin content are in progress which, combined with data transformation and selection of spectra regions, could put the two instruments on similar performance grounds. These results are particularly relevant for rapid and simple wood phenotyping applications in advanced tree breeding operations.

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Evaluation of Lignin Syringyl/Guaiacyl Ratio in Eucalyptus Camaldulensis across Three Diverse Sites Based on near Infrared Spectroscopic Calibration Modelling with Five Eucalyptus Species and its Impact on Kraft Pulp Yield

Cited by 25 publications

References 21 publications

Compositional Variability of Lignin in Biomass

Compositional Variability of Lignin in Biomass

Modelos NIRS para as características químicas da madeira de Eucalyptus benthamii Maiden & Cambage

Comparative performance of bench and portable near infrared spectrometers for measuring wood samples of two Eucalyptus species (E. pellita and E. benthamii)

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