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Molecules 2012, 17(4), 3639-3652; doi:10.3390/molecules17043639
Article

Relationship Between Wood Color Parameters Measured by the CIELab System and Extractive and Phenol Content in Acacia mangium and Vochysia guatemalensis from Fast-Growth Plantations

1,* , 2
,
2
 and
1,*
1 Instituto Tecnológico de Costa Rica, Escuela de Ingeniería Forestal, P.O. Box 159-7050 Cartago, Costa Rica 2 Escuela de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Costa Rica, Apartado 86-3000 Heredia, Costa Rica
* Authors to whom correspondence should be addressed.
Received: 17 February 2012 / Revised: 17 March 2012 / Accepted: 22 March 2012 / Published: 26 March 2012
(This article belongs to the Section Metabolites)
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Abstract

The heterogeneity of color distribution between sapwood and heartwood limits the market for wood from fast-growth plantations of tropical species. Wood color is associated with wood extractives contents. This study presents the relationship between wood color parameters measured by the CIELab color system and total amount of extractives and phenolic-type extractives in ethanol-toluene and hot water extracts of wood from two fast-growth plantation species. The results demonstrated that the difference in sapwood and hardwood color in Vochysia guatemalensis and Acacia mangium is caused by lower concentrations of extractives in sapwood of both species. Additionally, variations in total extractive and phenolic content have different effects on the color parameters (L*, a* and b*) of both species studied. In Vochysia guatemalensis wood, parameter L* decreases as total extractive and phenolic content increases; however, parameter a* increases as the content of extractives and phenols increases. In Acacia mangium, the amount of phenols showed no relationship with the color parameters. The ethanol-toluene total extractive content, however, shows a relationship with several color parameters. An increase in the content of total extractives in water and ethanol-toluene increases parameter a*, but decreases parameter L*.
Keywords: extractives; CIELab; phenols; tropical wood; wood color extractives; CIELab; phenols; tropical wood; wood color
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Moya, R.; Fallas, R.S.; Bonilla, P.J.; Tenorio, C. Relationship Between Wood Color Parameters Measured by the CIELab System and Extractive and Phenol Content in Acacia mangium and Vochysia guatemalensis from Fast-Growth Plantations. Molecules 2012, 17, 3639-3652.

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