Short infrared absoption and emission study of antipolo (Artocarpus sericicarpus), bagtikan (Parashorea malaanonan), dita (Alstonia scholaris (Linn.) R. Br.), mahogany (Swietenia macrophylla), and narra (Pterocarpus
Abstract
Near infrared reflectance spectroscopy was used to study the short infrared absorption and emission of five different species of wood (antipolo, bagtikan, dita, mahogany and narra) that are commonly used in construction works and for furniture. The high near infrared absorption values of the samples in the region 820 nm to 950 nm could be due to the water content of the samples as the region coincides with the short infrared absorption of water. Based from the results, dita was labeled as the sample having relatively the highest amount of water, followed by mahogany, narra, bagtikan and antipolo. It was also suggested that alkaloids, flavonoids and phenolic acid that dita contain might have contributed its high near infrared absorbance in the region below 850 nm.