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

In 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.  Folin-Ciocalteau 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-deoxy-proanthocyanidins were not detected.Neste 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: α-curcumeno, α-diidroturmerona, β-diidroturmerona, cedranol, 1-ciclopentil-3-[2,4-dimetil-fenil]propano. A análise dos fenóis totais foi conduzida com base nos extratos metanol-água (MA) e acetona-água (AA), em que esse último apresentou maior rendimento. O teor de fenóis totais foi determinado pelos métodos Folin-Ciocalteau e Azul da Prússia modificado. No método Folin-Ciocalteau, foram encontrados 0,93 mg g-1 de madeira para o extrato MA e 1,56 para o extrato AA e no método azul da Prússia modificado, foram determinados 2,74 mg g-1 de madeira para o extrato MA e 4,42 para o extrato AA. O teor de proantocianidinas foi determinado pelos métodos da vanilina e n-butanol:ácido. No método n-butanol:ácido, foram encontrados 0,012 mg g-1 de madeira para o extrato MA e 0,017 para o extrato AA e, no método da vanilina, foram determinados 0,29 mg g-1 de madeira para o extrato MA e 0,58 para o extrato AA. Não foram detectados 3-deoxi-proantocianidinas

STUDY OF MACROMOLECULAR CONSTITUENTS, VOLATILE EXTRACTIVES AND PHENOLICS FROM CANDEIA WOOD - Moquinia polymorpha (LESS.) DC.

Neste estudo, foram analisados os principais componentes qu\uedmicos da madeira da Moquinia polymorpha (LESS.) DC., conhecida como candeia ou cambar\ue1, nativa da regi\ue3o Sul de Minas Gerais. A composi\ue7\ue3o qu\uedmica dessa madeira foi: 47,5% de \u3b1-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 \ue1gua quente. Nos compostos vol\ue1teis identificados, destacaram-se: \u3b1-curcumeno, \u3b1-diidroturmerona, \u3b2-diidroturmerona, cedranol, 1-ciclopentil-3-[2,4-dimetil-fenil]propano. A an\ue1lise dos fen\uf3is totais foi conduzida com base nos extratos metanol-\ue1gua (MA) e acetona-\ue1gua (AA), em que esse \ufaltimo apresentou maior rendimento. O teor de fen\uf3is totais foi determinado pelos m\ue9todos Folin-Ciocalteau e Azul da Pr\ufassia modificado. No m\ue9todo Folin-Ciocalteau, foram encontrados 0,93 mg g-1 de madeira para o extrato MA e 1,56 para o extrato AA e no m\ue9todo azul da Pr\ufassia modificado, foram determinados 2,74 mg g-1 de madeira para o extrato MA e 4,42 para o extrato AA. O teor de proantocianidinas foi determinado pelos m\ue9todos da vanilina e n-butanol:\ue1cido. No m\ue9todo n-butanol:\ue1cido, foram encontrados 0,012 mg g-1 de madeira para o extrato MA e 0,017 para o extrato AA e, no m\ue9todo da vanilina, foram determinados 0,29 mg g-1 de madeira para o extrato MA e 0,58 para o extrato AA. N\ue3o foram detectados 3-deoxi-proantocianidinas.In this study, the main chemical components of Moquinia polymorpha (LESS.) DC. (candeia or cambar\ue1) wood were investigated. This wood is native in the Southern region of Minas Gerais - Brazil. The chemical composition was: 47.5% of \u3b1-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: \u3b1-curcumene, \u3b1-dihydroturmerone, \u3b2-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. Folin-Ciocalteau 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-deoxy-proanthocyanidins were not detected

Constituintes voláteis de cafés "gourmet" e mole do cerrado do triângulo mineiro em função da torra

Neste trabalho foi estudada a variação da composição dos voláteis de dois cafés "gourmet" e de um café mole em função do grau de torrefação. Os cafés provenientes de Araguari, cerrado do Triângulo Mineiro, foram submetidos à torra americana (grãos marrons claros), média (grãos marrons) e forte (grãos pretos) e, em seguida, moídos e submetidos a uma destilação por arraste de vapor em contra-corrente com diclorometano. A análise de cromatografia gasosa acoplada à espectrometria de massas (CG-EM) dos constituintes voláteis mostrou que piridina, pirazina e derivados, furfural e derivados são os principais constituintes voláteis dos cafés analisados. Mostrou ainda que não é possível diferenciar os três tipos de café pelos compostos dominantes (concentração acima de 1%) no aroma. Foi observado também que a torra afeta sensivelmente os resultados, sendo que a torra americana, usada normalmente na prova da xícara para classificação sensorial de cafés, produz alguns voláteis de forte impacto no aroma que não aparecem na torra média nem na forte, além de apresentar concentrações dos componentes mais comuns muito diferentes daquelas observadas nas outras duas torras

Compostos bioativos e atividade antioxidante do café conilon submetido a diferentes graus de torra Bioactive compounds and antioxidant activity of conilon coffee submitted to different degrees of roasting

<abstract language="eng">The bioactive compounds and antioxidant activity presented by Conilon coffee (C. Canephora) variety, produced in the Espírito Santo State, Brazil, were quantified. The light roast coffee showed the highest level of total phenols, trigonelline, caffeic and chlorogenic acids. The proanthocyanidin level was the highest for dark roast coffee, while caffeine level didn't show significative changes for the light and middle roast coffees. All the Conilon coffee extracts showed antioxidant activity depending on bioactive compounds concentration and roasting degree. The coffee samples submitted to a light roasting degree showed the highest antioxidant activity

PHYSICOCHEMICAL CHARACTERIZATION AND FLAVONOID CONTENTS OF ARTISANAL BRAZILIAN GREEN PROPOLIS

Objective: Green propolis (Baccharis dracunculifolia) is widely used in Brazilian folk medicine and elsewhere for treating varied illness. To address the need to meet its chemical composition and pharmacological effects, this study aimed to assess the physicochemical properties of green propolis from the metropolitan region of Vale do Aço, Minas Gerais, Brazil.Methods: Besides wax and ash contents analysis, flavonoids were analyzed by UV-visible scan spectrophotometry and gas chromatography coupled to mass spectra (GC-MS).Results: Samples were under the limits of ashes adopted in Brazil, and ranged from 4.84% to 12.78% regarding loss on drying. Wax content of propolis from the winter sample (10.84%) was higher than summer (8.94%) and autumn samples (7.22%). Summer samples, however, presented the highest concentration of flavonoids (1.697 mg/mL), and followed by autumn and winter samples, respectively.Conclusion: Our findings raised the possibility that this source of propolis may be useful an adjuvant phytotherapeutic product, and contributes to investigations that seek to verify the biological activities of green propolis.Â

STUDY OF MACROMOLECULAR CONSTITUENTS, VOLATILE EXTRACTIVES AND PHENOLICS FROM CANDEIA WOOD - Moquinia polymorpha (LESS.) DC.

In 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.  Folin-Ciocalteau 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-deoxy-proanthocyanidins were not detected.</p

STUDY OF MACROMOLECULAR CONSTITUENTS, VOLATILE EXTRACTIVES AND PHENOLICS FROM CANDEIA WOOD - Moquinia polymorpha (LESS.) DC.

Neste 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: α-curcumeno, α-diidroturmerona, β-diidroturmerona, cedranol, 1-ciclopentil-3-[2,4-dimetil-fenil]propano. A análise dos fenóis totais foi conduzida com base nos extratos metanol-água (MA) e acetona-água (AA), em que esse último apresentou maior rendimento. O teor de fenóis totais foi determinado pelos métodos Folin-Ciocalteau e Azul da Prússia modificado. No método Folin-Ciocalteau, foram encontrados 0,93 mg g-1 de madeira para o extrato MA e 1,56 para o extrato AA e no método azul da Prússia modificado, foram determinados 2,74 mg g-1 de madeira para o extrato MA e 4,42 para o extrato AA. O teor de proantocianidinas foi determinado pelos métodos da vanilina e n-butanol:ácido. No método n-butanol:ácido, foram encontrados 0,012 mg g-1 de madeira para o extrato MA e 0,017 para o extrato AA e, no método da vanilina, foram determinados 0,29 mg g-1 de madeira para o extrato MA e 0,58 para o extrato AA. Não foram detectados 3-deoxi-proantocianidinas.In 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. Folin-Ciocalteau 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-deoxy-proanthocyanidins were not detected