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Licensed Unlicensed Requires Authentication Published by De Gruyter November 1, 2010

Near infrared spectroscopy (NIRS) as a potential tool for monitoring trade of similar woods: Discrimination of true mahogany, cedar, andiroba, and curupixá

Tereza Cristina Monteiro Pastore, Jez Willian Batista Braga, Vera Terezinha Rauber Coradin, Washington Luiz Esteves Magalhães, Esmeralda Yoshico Arakaki Okino, José Arlete Alves Camargos, Graciela Inês Bonzon de Muñiz, Otávio Augusto Bressan and Fabrice Davrieux
From the journal Holzforschung

Abstract

Mahogany is one of the most valuable woods and was widely used until it was included in Appendix II of the Convention on International Trade in Endangered Species as endangered species. Mahogany wood sometimes is traded under different names. Also, some similar woods belonging to the Meliaceae family are traded as “mahogany” or as being of a “mahogany pattern”. To investigate the feasibility of the use of near infrared spectroscopy for wood discrimination, the mahogany (Swietenia macrophylla King.), andiroba or crabwood (Carapa guianensis Aubl.), cedar (Cedrela odorata L.), and curupixá (Micropholis melinoniana Pierre) woods were examined. Four discrimination models based on partial least squares-discriminant analysis were developed based on a calibration set composed of 88 samples and a test set with 44 samples. Each model corresponds to the discrimination of a wood species from the others. Optimization of the model was performed by means of the OPUS® software followed by statistical analysis software (Matlab®). The observed root mean square errors of predictions were 0.14, 0.09, 0.12, and 0.06 for discriminations of mahogany, cedar, andiroba, and curupixá, respectively. The separations of the species obtained based on the difference in the predicted values was at least 0.38. This makes it possible to perform safe discriminations with a very low probability of misclassifying a sample. This method can be considered accurate and fast.


Corresponding author. Laboratório de Produtos Florestais, Serviço Florestal Brasileiro, SCEN trecho 2, Bloco D, 70818900, Brasilia, DF, Brazil

Received: 2010-3-30
Accepted: 2010-9-2
Published Online: 2010-11-1
Published in Print: 2011-01-01

©2011 by Walter de Gruyter Berlin New York

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