Estudo dos constituintes macromoleculares, extrativos voláteis e compostos fenólicos da madeira de candeia – <i>Moquinia polymorpha</i> (Less.) DC.

Abstract

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.

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

“…Sartori et al (2018) [65] found yields of 360.5 and 401.2 mg EAG/g for the extract in ethanol:water (50% v/v) for the bark of two E. urophylla hybrids. Lima et al (2007) [1] reported a total phenol content of 0.93 mg/g of wood in methanol:water extracts of Candeia (Moquinia polymorpha (LESS.) DC.)…”

“…The wood's characteristics vary, depending on genetic and environmental variations, influencing its potential for different uses [1][2][3]. Wood is a biological, heterogeneous, complex material, with variations between species, individuals of the same species and parts of the same individual [4][5][6].…”

Triterpenes from the flowers of Gochnatia polymorpha subsp. floccosa

“…Previous studies on G. polymorpha subsp. unspecified, reported the isolation of the triterpene bauerenyl acetate and dehydrocostus lactone from the bark and trunk bark (Farias et al, 1984), sesquiterpenes, sesquiterpene lactones and dimeric lactones from the roots and aerial parts (Bohlmann et al, 1986), flavonoids, phenolic compounds and a proline derivative from more polar extracts from leaves (Moreira et al, 2000), and essential oil of the wood (Lima et al, 2007). The studies on G. polymorpha subsp.…”

Efeito do material genético e tipo de solvente na quantificação de compostos solúveis da madeira em clones de Eucalyptus

“…A classificação dos extrativos está relacionada, principalmente, com suas características estruturais. Segundo Lima et al (2007) e Esteves et al(2011) esses compostos, normalmente, são formados por ácidos orgânicos, álcoois, aldeídos, ésteres, cetona, fenóis de baixa massa molecular, hidrocarboneto alifáticos e terpenos. Dependendo da polaridade do solvente utilizado, pode-se obter determinada classe de extrativos da madeira, seja apolar ou polar.…”