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Predicting the lignin H/G ratio of Pinus sylvestris L. wood samples by PLS-R models based on near-infrared spectroscopy

  • Ana Alves EMAIL logo , Rita Simões , José Luís Lousada , José Lima-Brito and José Rodrigues
Published/Copyright: December 6, 2019
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Abstract

Softwood lignin consists mainly of guaiacyl (G) units and low amounts of hydroxyphenyl (H) units. Even in a small percentage, the ratio of H to G (H/G) and the intraspecific variation are crucial wood lignin properties. Analytical pyrolysis (Py) was already successfully used as a reference method to develop a model based on near-infrared (NIR) spectroscopy for the determination of the H/G ratio on Pinus pinaster (Pnb) wood samples. The predicted values of the Pinus sylvestris (Psyl) samples by this model were well correlated (R = 0.91) with the reference data (Py), but with a bias that increased with increasing H/G ratio. Partial least squares regression (PLS-R) models were developed for the prediction of the H/G ratio, dedicated models for Psyl wood samples and common models based on both species (Pnb and Psyl). All the calibration models showed a high coefficient of determination and low errors. The coefficient of determination of the external validation of the dedicated models ranged from 0.92 to 0.96 and for the common models ranged from 0.83 to 0.93. However, the comparison of the predictive ability of the dedicated and common models using the Psyl external validation set showed almost identical predicted values.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by the Fundação para a Ciência e a Tecnologia, FCT, through Centro de Estudos Florestais (UID/AGR/00239/2019) and the project PTDC/AGR-CFL/110988/2009. The first author was supported by the FCT – Fundação para a Ciência e a Tecnologia, I.P., through a contract – DL57/2016/CP1382/CT0005. The third author integrates the CITAB research center and acknowledges FCT for the conceded financial support under the project UID/AGR/04033/2019, and COMPETE 2020 with the code POCI-01-0145-FEDER-006958.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

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Received: 2019-07-17
Accepted: 2019-11-05
Published Online: 2019-12-06
Published in Print: 2020-07-28

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