Abstract

CONTRERAS QUINONES, Héctor Jesús et al. Preliminary identification of woods from Mexican pines by ATR-FTIR spectroscopy. Rev. mex. de cienc. forestales [online]. 2022, vol.13, n.72, pp.4-29.  Epub Aug 22, 2022. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v13i72.1186.

A wide variety of species of the genus Pinus are widely distributed in Mexico, and are of great commercial importance, so proper identification of its wood is important. This is not an easy task, due to the anatomical and chemical characteristics of the pines; for this reason, the potential of an ATR-FTIR spectral reference library of wood (spectral library) was investigated. The spectra of woods have enough differences to implement an identification process by spectral comparison. Spectral library was created using samples from xylotheque in the Department of Wood, Cellulose and Paper (Universidad de Guadalajara), which have been rigorously identified. The spectra of nine pine species (Pinus arizonica, P. ayacahuite, P. devoniana, P. douglasiana, P. durangensis, P. oocarpa, P. patula, P. pringlei, and P. pseudostrobus), were obtained from three different places, so that spectral library has 27 spectra. To determine the viability of method, other samples from xylotheque were analyzed, different from those of spectral library, of five species (P. ayacahuite, P. devoniana, P. oocarpa, P. pseudostrobus, and Cupressus arizonica), obtaining in three cases the highest correlations for correct species, and a second place for the other two. The use of a spectral library is a quick method, which can help in identification of wood and establish its origin. The technique could be improved by developing a spectral and statistical treatment that considers the particularities of lignocellulosic materials.

Keywords : ATR-FTIR Spectroscopy; spectral library; wood; wood chemistry; Mexican pines; xylotheque.

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