Low Molecular Weight Polyphenols in Cork of<i>Quercus suber</i>

Conde, E.; Cadahía, Estrella; García‐Vallejo, M. C.; Simón, Brígida Fernández de; Adrados, José Ramón González

doi:10.1021/jf960486w

Cited by 78 publications

(58 citation statements)

References 16 publications

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“…68 Some of these components are responsible for the organoleptic properties of wine. 61,[69][70][71][72][73][74][75] This effect has been confirmed by Mazzoleni et al, 73 who found concentrations of phenolic compounds that exceeded the flavour threshold.…”

Section: Extractable Componentsmentioning

confidence: 76%

Cork: properties, capabilities and applications

Silva¹,

Sabino²,

Fernandes³

et al. 2008

International Materials Reviews

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Cork is a natural, renewable, sustainable raw material that has been used for many centuries. As a result of this very long term interest, the scientific literature on cork is extensive. The present review focuses on the chemical composition, physical and mechanical properties of cork and on its products and sub-products. The substantial efforts to fully characterise cork, as well as new developments and evolving research, are reviewed, beginning with its histology, growth and morphology (at macro-and microscales). The chemical structure is analysed in detail, covering both the materials that form the wall structure and the low molecular weight, extractable components. The unique properties of cork are discussed and correlated with current knowledge on morphology and chemical structure. Finally, the important industrial applications of cork are reviewed, in the context of research to provide cork with novel, high added-value applications.

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Section: Extractable Componentsmentioning

confidence: 76%

Cork: properties, capabilities and applications

Silva¹,

Sabino²,

Fernandes³

et al. 2008

International Materials Reviews

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“…There was a trend to have the lowest proportion of non-polar compounds when total extractives content was higher. The more polar extractives (ethanol and water solubles), which include mostly low and high molecular mass phenolic compounds, represented the majority of the potentially solubilisable compounds from cork Conde et al 1997;Mazzoleni et al 1998). This is also a chemical factor that may be involved in the natural variability of cork performance, e.g.…”

Section: Discussionmentioning

confidence: 99%

Variability of the Chemical Composition of Cork

Pereira¹

2013

BioResources

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The chemical composition of cork was determined, following a sampling that covered the whole production area in Portugal (29 provenances from six regions) with samples taken at cork stripping. To analyse between population variations, a more intensive sampling was made in two locations. The overall mean chemical composition of cork was: extractives 16.2% (dichloromethane 5.8%, ethanol 5.9%, water 4.5%), suberin 42.8% (long-chain lipids 41.0%, glycerol 3.8%), and lignin 22.0% (Klason 21.1%, acid soluble 0.9%). The suberin compositional ratio of long chain lipids to glycerol, LCLip:Gly, was 11.3. The proportion of neutral sugars in the polysaccharides was: glucose 46.1%, xylose 25.1%, arabinose 18.0%, mannose 3.0%, galactose 7.3%, and rhamnose 0.5%. The range of values was large and the variation between individual trees seemed to be the major factor of the differences. Geographical location of cork production was statistically significant only in a few cases when considering site and not when considering regions. The population variation in two sites was important and the absolute difference between the site mean values was small. This research covers the natural variability of cork's chemical composition and discusses the contribution of the structural compounds to the variation of cork properties.

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“…The phytochemical analysis included phenolics, flavonoids and tannins compounds (Rorong and Suryanto, 2010). The phenolics compound analysis was according to Folin Ciocalteu 50% methods by Conde et al 1997. The flavonoids compound analysis was according to aluminum chloride 2% in ethanol by Meda et al 2005.…”

Section: Methodsmentioning

confidence: 99%

PHYTOCHEMICAL ANALYSIS OF ECENG GONDOK (Eichhornia crassipessolms) OF AGRICULTURAL WASTE AS BIOSENSITIZER FOR FERRI PHOTOREDUCTION

Rorong¹,

Sudiarso²,

Prasetya³

et al. 2012

Agrivita.J.Agr.Sci

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Analysis of the phenolics, flavonoids and tannins compounds has been done on water hyacinth leaves (Eichornia crassipessolms). The research was carried out in several stages, including: sample preparation, maceration extraction, and evaporation. The total phenolics constituted analysis by Folin Ciocalteu 50%, flavonoidss by using aluminium chloride 2% in ethanol, and tannins by using vanillin 4% solution in methanol, continued by using ultra violet visible spectrophotometry (UV-Vis) methods. The analysis showed that the phenolics content of water hyacinth with methanol 60% equal to gallic acid 2.72 mg /kg is the highest phenolics content, and the lowest phenolics by distilled water equal to gallic acid 1.07 mg /kg and the flavonoids with methanol 80% equal to 3.29 mg quercetin/kg is the highest flavonoids content, and the lowest by the distilled water of quercetin 1.65 mg /kg and the highest condensed tannins content by methanol 80% of 0.7 mg/kg catechin . The Fe 2+ content process with methanol 60% solution was 17.67 mg/kg, and with distilled water was 2.94 mg/kg. Solution without extract as sensitizer produced only Fe 2+ ion at 5.6 mg/kg and the extract solution without light at 0.06 mg/kg.

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Low Molecular Weight Polyphenols in Cork ofQuercus suber

Cited by 78 publications

References 16 publications

Cork: properties, capabilities and applications

Cork: properties, capabilities and applications

Variability of the Chemical Composition of Cork

PHYTOCHEMICAL ANALYSIS OF ECENG GONDOK (Eichhornia crassipessolms) OF AGRICULTURAL WASTE AS BIOSENSITIZER FOR FERRI PHOTOREDUCTION

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