RESUMONeste estudo, foram analisados os principais componentes químicos da madeira da Moquinia polymorpha (LESS.) DC., conhecida como candeia ou cambará, nativa da região Sul de Minas Gerais. A composição química dessa madeira foi: 47,5% de α-celulose, 25,4% de hemiceluloses A e B, 24,0% de lignina, 73,2% de holocelulose, 3,82% de extrativos em etanol:cicloexano (1:1, v v -1 ), 3,21% em etanol e 4,04% em água quente. Nos compostos voláteis identificados, destacaram-se:
ABSTRACTIn this study, the main chemical components of Moquinia polymorpha (LESS.) DC. (candeia or cambará) wood were investigated. This wood is native in the Southern region of Minas Gerais -Brazil. The chemical composition was: 47.5% of α-cellulose, 25.4% of A and B hemicelluloses, 24.0% of lignin, 73.2% of holocellulose, 3.82% of ethanol:cyclohexane (1:1, v v -1 ) extractives, 3.21% of ethanol extractives and 4.04% of hot water extractives. The volatile composition was mainly: α-curcumene, α-dihydroturmerone, β-dihydroturmerone, cedranol, 1-cyclopentyl-3-[2,4-dimethylphenyl]propane. The total phenols analysis was carried out on methanol:water (MW) and acetone:water (AW) extracts. The last one presented better yield. The total phenols were determined by Folin-Ciocalteau and the modified Prussian blue assays. FolinCiocalteau yielded 0.93 mg g -1 of wood for MW extract and 1.56 for AW extract; modified Prussian blue yielded 2.74 mg g -1 of wood for MW extract and 4.42 for AW extract. Proanthocyanidins were determined by n-buthanol-acid and vanillin assays. The n-buthanol acid yielded 0.012 mg g -1 of wood for MW extract and 0.017 for AW extract; vanillin: 0.29 mg g -1 of wood for MW extract and 0.58 for AW extract. 3-deoxyproanthocyanidins were not detected.
