Polyphenol-Zusammensetzung der Rinde von E. camaldulensis, E. globulus und E. rudis

Conde, E.; Cadahía, Estrella; Díez-Barra, Rafael; García‐Vallejo, M. C.

doi:10.1007/s001070050162

Cited by 41 publications

(26 citation statements)

References 6 publications

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“…Woods with higher pulp yield values simultaneously exhibit the lowest total phenols content. This result supports the idea that phenolic compounds are involved in inhibition problems in pulping process (Conde et al, 1995). The total phenol content of all quartiles is similar to those of Cadahía et al (1997).…”

Section: Resultssupporting

confidence: 86%

“…As expected, methoxyl group content affects the 3D structure of lignin, with implications both on the delignification process (Stewart et al, 2006) and wood flexibility (Abreu et al, 1999). Phenolic compounds seem also to be related to mechanical or chemical inhibition problems in pulping process (Conde et al, 1995). A low within-tree correlation of basic density to S/G ratio was found by Ona (Ona et al, 1998).…”

Section: Introductionmentioning

confidence: 95%

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Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Seca

Domingues

2006

Pesq. agropec. bras.

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-The objective of this work was to evaluate the use of basic density and pulp yield correlations with some chemical parameters, in order to differentiate an homogeneous eucalyptus tree population, in terms of its potential for pulp production or some other technological applications. Basic density and kraft pulp yield were determined for 120 Eucalyptus globulus trees, and the values were plotted as frequency distributions. Homogenized samples from the first and fourth density quartiles and first and fourth yield quartiles were submitted to total phenols, total sugars and methoxyl group analysis. Syringyl/guaiacyl (S/G) and syringaldehyde/vanillin (S/V) ratios were determined on the kraft lignins from wood of the same quartiles. The results show the similarity between samples from high density and low yield quartiles, both with lower S/G (3.88-4.12) and S/V (3.99-4.09) ratios and higher total phenols (13.3-14.3 g gallic acid kg -1 ). Woods from the high yield quartile are statistically distinguished from all the others because of their higher S/G (5.15) and S/V (4.98) ratios and lower total phenols (8.7 g gallic acid kg -1 ). Methoxyl group and total sugars parameters are more adequate to distinguish wood samples with lower density.Index terms: Eucalyptus globulus, syringyl, guaiacyl, phenols, methoxyl group, kraft pulping. Densidade e rendimento em polpa celulósica e sua relação com alguns parâmetros químicos no eucaliptoResumo -O objetivo deste trabalho foi avaliar a aplicabilidade de correlações entre rendimento em polpa e densidade básica com alguns parâmetros químicos, para diferenciar uma população homogênea de árvores de eucalipto, em termos de capacidade de produção de polpa celulósica ou de outras aplicações. Determinou-se a densidade básica e o rendimento em polpa celulósica em 120 árvores de Eucalyptus globulus, e os resultados foram representados como distribuição de freqüências. Na madeira das árvores dos primeiro e quarto quartis de densidade e de rendimento, determinaram-se os teores de fenóis totais, açúcares totais e grupos metoxílicos. Nas respectivas ligninas kraft determinaram-se as razões seringilo/guaiacilo (S/G) e seringaldeído/vanilina (S/V). As amostras dos quartis de alta densidade e as de baixo rendimento foram semelhantes, ambas com baixos valores de S/V (3,99-4,09) e S/G (3,88-4,12) e os mais elevados teores de fenóis totais (13,3-14,3 g de ácido gálico por quilograma). As madeiras do quarto quartil de rendimento são estatisticamente distintas das outras, com as maiores razões S/G (5,15) e S/V (4,98) e os menores teores de fenóis totais (8,7 g de ácido gálico por quilograma). Os parâmetros grupos metoxílicos e açúcares totais são os mais adequados para a diferenciação das amostras provenientes do primeiro quartil de densidade.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 95%

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Seca

Domingues

2006

Pesq. agropec. bras.

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“…This is similar to previous findings in which methanol was successfully employed for extraction of flavonoids from medicinal plants (Stankovic, 2011). We observed higher amount of phenolics in E. camaldulensis leaves than previous reports on E. camaldulensis wood and bark for the same compounds (Conde et al, 1995;Conde et al, 1996). As compared to our finding, Abu-Qatouseh et al (2013) explored relatively higher amount of flavoniods in another Euclayptus species.…”

Section: Total Phenolic and Total Flavonoid Contents Of E Camaldulencontrasting

confidence: 79%

Chemical composition and in vitro antioxidant and antitumor activities of Eucalyptus camaldulensis Dehn. leaves

Ashraf

Sarfraz

Mahmood

et al. 2015

Industrial Crops and Products

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“…8,9 The chemical constituents of the bark of the genus Eucalyptus is well established, especially E. camaldulensis. Conde et al 10 found that the alcoholic extract of the bark of E. camaldulensis contains polyphenolic compounds such as flavonoids, phenolic acids and aldehydes. Catechin, gallocatechin, gallic, chlorogenic and ellagic acids and quercetin were also detected in the bark of E. camaldulensis and E. globulus.…”

Section: Introductionmentioning

confidence: 99%

The Egyptian Eucalyptus camaldulensis var. brevirostris: chemical compositions of the fruit volatile oil and antioxidant activity

El‐Ghorab

Fadel

El-Massry

2002

Flavour & Fragrance J

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The fruit volatile oil of E. camaldulensis var. brevirostris was isolated by hydrodistillation and thereafter the fruit marc was extracted by ethanol. The volatile oil obtained was subjected to analysis using gas chromatography-mass spectrometry. Thirty-eight volatile components were identified. The main volatile compounds in the fruit volatile oil were: aromadendrene (17.99%),˛-pinene (12.68%), p-cymenene (5.39%), -gurjunene (6.65%), cubenol (9.23%), thymol (1.62%) and p-cymen-7-ol (0.73%). The volatile components were classified into four groups: monoterpenes (20.6%), sesquiterpenes (33.8%), light-oxygenated (8.1%) and heavily-oxygenated (37.6%) compounds. The results showed that the concentration of sesquiterpenes and heavilyoxygenated compounds were higher than the other two classes. The main compound in the ethanol extract of fruit of E. camaldulensis was isolated by semi-preparative HPLC and identified as ellagic acid. The antioxidant activities of the fruits volatile oil and the ethanol extract as well as that of the tree bark were evaluated by the thiocyanate method. The ethanol extract of Eucalyptus fruit exhibited considerable activity compared with butylated hydroxyanisole (BHA) and tertiary butylated hydroquinone (TBHQ). The high inhibitory effect of the ethanol extract of fruit upon linoleic acid after 12 days might be related to the higher ellagic acid content.

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Polyphenol-Zusammensetzung der Rinde von E. camaldulensis, E. globulus und E. rudis

Cited by 41 publications

References 6 publications

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Basic density and pulp yield relationship with some chemical parameters in eucalyptus trees

Chemical composition and in vitro antioxidant and antitumor activities of Eucalyptus camaldulensis Dehn. leaves

The Egyptian Eucalyptus camaldulensis var. brevirostris: chemical compositions of the fruit volatile oil and antioxidant activity

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