Abstract
This study aimed to investigate the antioxidant ability and the chemical composition of apolar and polar extractives from Douglas-fir bark, cork and phloem, establishing a possible correlation with the structural variation along the tree stem and geographic location. Douglas-fir bark extractives’ composition were analyzed at three stem heights in trees from two locations. Cork and phloem extracts’ composition were analyzed in samples collected at stem base. Extractives content in Douglas-fir bark varied between 14 and 31% and polar extractives (11–29%) were dominant over non-polar. Lipophilic extracts were mainly composed of terpenoids, representing 27–77% of all compounds, highlighted by callitrisic acid (11–34%). Sterols were also abundant (6–45%), with β-sitosterol representing 7–33% of all compounds. Alkanoic acids were present in smaller amounts. Ethanol–water extracts showed high phenolic (562–762 mg GAE/g extract), flavonoid and condensed tannins contents (399–683 mg CE/g extract and 120–262 mg CE/g of extract), high scavenging (IC50 2.8 µg extract/mL) and reducing (12 mM Fe2+/g extract) abilities. Cork had high phenolic (819 mg GAE/g extract) and flavonoid contents (524 mg CE/g extract) and high antioxidant capacity (1080 mg TEAC/g extract). Detailed knowledge of Douglas-fir extracts demonstrates their potential as a source of fine chemicals towards different applications.
Funding source: Fundação para a Ciência e a Tecnologia
Award Identifier / Grant number: AGR/UID00239/2013
Award Identifier / Grant number: PD/BD/52404/2013
Acknowledgements
We thank Instituto da Conservação da Natureza e das Florestas (ICNF) for helping with the tree selection, and the sawmills Albano Leite da Silva, LDA and VilaMadeiras – Comércio de Madeiras, LDA for allowing the sampling at the time of tree harvest. We thank Lídia Silva and Joaquina Martins for help with the chemical analysis.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: Centro de Estudos Florestais (CEF) is a research unit funded by Fundação para a Ciência e a Tecnologia (FCT) (AGR/UID00239/2013). Sofia Cardoso acknowledges a FCT doctoral fellowship (PD/BD/52404/2013) under the Sustainable Forests and Products (SUSFOR) doctoral program.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Original articles
- Wood identification of two anatomically similar Cupressaceae species based on two-dimensional microfibril angle mapping
- Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating
- Impact of hygrothermal treatment on the physical properties and chemical composition of Moso bamboo (Phyllostachys edulis)
- Inverse characterisation of gradient distribution of the modulus of bamboo using a four-point bending test
- Correlation between bacterial decay and chemical changes in waterlogged archaeological wood analysed by light microscopy and Py-GC/MS
- Artificial neural networks modelling based on visual analysis of coated cross laminated timber (CLT) to predict color change during outdoor exposure
- Wood-adhesive bond loaded in mode II: experimental and numerical analysis using elasto-plastic and fracture mechanics models
- Influences of liquefied lignin content on the properties of waterborne polyurethane prepared with different chain extenders
- Composition and antioxidant properties of extracts from Douglas fir bark
Articles in the same Issue
- Frontmatter
- Original articles
- Wood identification of two anatomically similar Cupressaceae species based on two-dimensional microfibril angle mapping
- Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating
- Impact of hygrothermal treatment on the physical properties and chemical composition of Moso bamboo (Phyllostachys edulis)
- Inverse characterisation of gradient distribution of the modulus of bamboo using a four-point bending test
- Correlation between bacterial decay and chemical changes in waterlogged archaeological wood analysed by light microscopy and Py-GC/MS
- Artificial neural networks modelling based on visual analysis of coated cross laminated timber (CLT) to predict color change during outdoor exposure
- Wood-adhesive bond loaded in mode II: experimental and numerical analysis using elasto-plastic and fracture mechanics models
- Influences of liquefied lignin content on the properties of waterborne polyurethane prepared with different chain extenders
- Composition and antioxidant properties of extracts from Douglas fir bark