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Nadine Amusant - One of the best experts on this subject based on the ideXlab platform.
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Brief report A reverse chemical ecology approach to explore wood Natural Durability
Microbial Biotechnology, 2020Co-Authors: Thomas Perrot, Stéphane Dumarcay, Philippe Gérardin, Nadine Amusant, Jacques Beauchêne, Guillaume Salzet, Rodnay Sormani, Melanie Morel-rouhier, Éric GelhayeAbstract:The Natural Durability of wood species, defined as their inherent resistance to wood-destroying agents, is a complex phenomenon depending on many biotic and abiotic factors. Besides the presence of recalci-trant polymers, the presence of compounds with antimicrobial properties is known to be important to explain wood Durability. Based on the advancement in our understanding of fungal detoxification systems , a reverse chemical ecology approach was proposed to explore wood Natural Durability using fungal glutathione transferases. A set of six glu-tathione transferases from the white-rot Trametes versicolor were used as targets to test wood extracts from seventeen French Guiana neotropical species. Fluorescent thermal shift assays quantified interactions between fungal glutathione transferases and these extracts. From these data, a model combining this approach and wood density significantly predicts the wood Natural Durability of the species tested previously using long-term soil bed tests. Overall, our findings confirm that detoxification systems could be used to explore the chemical environment encountered by wood-decaying fungi and also wood Natural Durability.
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The role of extractives in the Natural Durability of the heartwood of Dicorynia guianensis Amsh: new insights in antioxydant and antifungal properties
Annals of Forest Science, 2018Co-Authors: Jean-baptiste Say Anouhe, Florence Niamké, Augustin Amissa Adima, Séraphin Kati-coulibaly, Milcard Faustin, David Virieux, Jean-luc Pirat, Nadine AmusantAbstract:Key message The Natural Durability of Dicorynia guianensis Amsh ’s heartwood is conferred by the high content of antioxidant phenolic compounds, especially tannins and flavonoids combined with the presence of fungistatic alkaloids. The content of phenolic compounds increases according to the Natural Durability classes, from durable wood (class 2) to moderately durable wood (class 3) and correlated to the antioxidant capacity. Context. The heartwood of Dicorynia guianensis Amsh is resistant to white rot fungi decay, but the mechanism of this Natural Durability is not fully elucidated. Aims. Biochemical studies were carried out in order to better understand the role of extractives in Natural Durability of D. guianensis. Methods. The powders from durable and moderately durable heartwood were extracted with methanol, ethanol, and hot water. The quantity of total phenols, tannins, and flavonoids as well as antioxidant activity, evaluated by 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) were determined using colorimetric methods. Antifungal activity was assessed by using two white rot fungi. The bioactive fractions and compounds were obtained using bio-guided fractionation, HPLC isolation, MS and RMN spectroscopic analyses. Results. Durable woods contain higher amounts of heartwood extract and antioxidant activity. Antioxidant activity was highly correlated with the content of phenolics. The purification of the most antioxidant fraction FII affords the characterization of (+)-catechin (−)-epicatechin, neoastilbin, astilbin, and isoastilbin. Alkaloid fraction FIII exhibits dose-dependent fungistatic activity against Pycnoporus sanguineus Linnaeus and Trametes versicolor Quelet. Conclusion. Phenolic antioxidants and fungistatic alkaloids positively impact the Natural Durability of D. guianensis.
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The role of extractives in the Natural Durability of the heartwood of Dicorynia guianensis Amsh: New insights in antioxydant and antifungal properties
Annals of Forest Science, 2018Co-Authors: Jean-baptiste Say Anouhe, Florence Niamké, Augustin Amissa Adima, Séraphin Kati-coulibaly, Milcard Faustin, David Virieux, Jean-luc Pirat, Nadine AmusantAbstract:The Natural Durability of Dicorynia guianensis Amsh 's Heartwood is conferred by the high content of antioxidant phenolic compounds, especially tannins and flavonoids combined with the presence of fungistatic alkaloids. The content of phenolic compounds increases according to the Natural Durability classes, from durable wood (class 2) to moderately durable wood (class 3) and correlated to the antioxidant capacity. Context The heartwood of Dicorynia guianensis Amsh is resistant to white rot fungi decay, but the mechanism of this Natural Durability is not fully elucidated. Aims: Biochemical studies were carried out in order to better understand the role of extractives in Natural Durability of D. guianensis. Methods: The powders from durable and moderately durable heartwood were extracted with methanol, ethanol, and hot water. The quantity of total phenols, tannins, and flavonoids as well as antioxidant activity, evaluated by 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) were determined using colorimetric methods. Antifungal activity was assessed by using two white rot fungi. The bioactive fractions and compounds were obtained using bio-guided fractionation, HPLC isolation, MS and RMN spectroscopic analyses. Results: Durable woods contain higher amounts of heartwood extract and antioxidant activity. Antioxidant activity was highly correlated with the content of phenolics. The purification of the most antioxidant fraction FII affords the characterization of (+)-catechin (−)-epicatechin, neoastilbin, astilbin, and isoastilbin. Alkaloid fraction FIII exhibits dose-dependent fungistatic activity against Pycnoporus sanguineus Linnaeus and Trametes versicolor Quelet. Conclusion: Phenolic antioxidants and fungistatic alkaloids positively impact the Natural Durability of D. guianensis.
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A review on prediction methods of wood Natural Durability
2017Co-Authors: Nadine Amusant, Claudiane Flora, Jacques Beauchêne, Emeline Houël, Christophe DuplaisAbstract:Natural Durability of timber may be defined as “inherent ability of timber to attack by wood destroying organisms (bacteria, fungi, insects, marine borers) without preservative treatment. On the base of biological tests, EN-350-2 standard (Afnor, 1994), describe the classification of wood species according to their Natural Durability. But these specifications are not adapted in the case of wood species with high variability of Natural Durability at inter or intra tree level in this case; the variability of Natural Durability could be detrimental to end-users. Because of standard testing methods are complex and time-consuming, it is important to propose alternative methods to predict Natural Durability. The focus of this re view is to present different methods to predict Natural Durability based on the presence of chemical extractives, which have long been recognized as key features that impart Natural Durability of some wood species.
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Natural Durability of Sextonia rubra, an Amazonian tree species: description and origin
2017Co-Authors: Emeline Houël, Christophe Duplais, Alice M. S. Rodrigues, Eric-andré Nicolini, Onoefe Ngwete, Didier Stien, Nadine AmusantAbstract:Sextonia rubra is a tropical tree species belonging to Lauraceae family. In French Guiana, its long lasting heartwood is largely exploited for different purposes including house construction, and furniture making. Decay tests have confirmed S. rubra Natural Durability, and led us to discover some variability. Rubrynolide and rubrenolide, which are two majors metabolites isolated from the heartwood of S. rubra, exhibit potent antifungal and termiticidal activities that result in the exceptiona l Natural Durability of this species heartwood. Interestingly, we have also described and isolated acylated precursors of these two secondary metabolites from the sapwood. Although the constitutions and total synthesis of rubrynolide and rubrenolide have been comprehensively described in literature, little is known about their origin and fate in the context of the heartwood formation process. HPLC was thus used to investigate the repartition of rubrenolide and rubrynolide as well as the acylated precursors in sapwood and heartwood of S. rubra, leading to propose that the biotransformation of the precursors into rubrenolide and rubrynolide occurs at the transition zone between sapwood and heartwood. Finally, 13 trees were sampled from Natural populations char acterized by different growth dynamics evaluated through dendrometric parameters, tree architecture description and bark desquamation. Our aim was to study the influence of life-history traits on S. rubra heartwood formation from a chemical quantitative and qualitative (LC-MS analysis) point of view. We observed significant variations concerning sapwood and heartwood extraction yields depending on the trees, as well as a noticeable variability of the heartwood chemical signature.
Florence Niamké - One of the best experts on this subject based on the ideXlab platform.
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The role of extractives in the Natural Durability of the heartwood of Dicorynia guianensis Amsh: new insights in antioxydant and antifungal properties
Annals of Forest Science, 2018Co-Authors: Jean-baptiste Say Anouhe, Florence Niamké, Augustin Amissa Adima, Séraphin Kati-coulibaly, Milcard Faustin, David Virieux, Jean-luc Pirat, Nadine AmusantAbstract:Key message The Natural Durability of Dicorynia guianensis Amsh ’s heartwood is conferred by the high content of antioxidant phenolic compounds, especially tannins and flavonoids combined with the presence of fungistatic alkaloids. The content of phenolic compounds increases according to the Natural Durability classes, from durable wood (class 2) to moderately durable wood (class 3) and correlated to the antioxidant capacity. Context. The heartwood of Dicorynia guianensis Amsh is resistant to white rot fungi decay, but the mechanism of this Natural Durability is not fully elucidated. Aims. Biochemical studies were carried out in order to better understand the role of extractives in Natural Durability of D. guianensis. Methods. The powders from durable and moderately durable heartwood were extracted with methanol, ethanol, and hot water. The quantity of total phenols, tannins, and flavonoids as well as antioxidant activity, evaluated by 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) were determined using colorimetric methods. Antifungal activity was assessed by using two white rot fungi. The bioactive fractions and compounds were obtained using bio-guided fractionation, HPLC isolation, MS and RMN spectroscopic analyses. Results. Durable woods contain higher amounts of heartwood extract and antioxidant activity. Antioxidant activity was highly correlated with the content of phenolics. The purification of the most antioxidant fraction FII affords the characterization of (+)-catechin (−)-epicatechin, neoastilbin, astilbin, and isoastilbin. Alkaloid fraction FIII exhibits dose-dependent fungistatic activity against Pycnoporus sanguineus Linnaeus and Trametes versicolor Quelet. Conclusion. Phenolic antioxidants and fungistatic alkaloids positively impact the Natural Durability of D. guianensis.
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The role of extractives in the Natural Durability of the heartwood of Dicorynia guianensis Amsh: New insights in antioxydant and antifungal properties
Annals of Forest Science, 2018Co-Authors: Jean-baptiste Say Anouhe, Florence Niamké, Augustin Amissa Adima, Séraphin Kati-coulibaly, Milcard Faustin, David Virieux, Jean-luc Pirat, Nadine AmusantAbstract:The Natural Durability of Dicorynia guianensis Amsh 's Heartwood is conferred by the high content of antioxidant phenolic compounds, especially tannins and flavonoids combined with the presence of fungistatic alkaloids. The content of phenolic compounds increases according to the Natural Durability classes, from durable wood (class 2) to moderately durable wood (class 3) and correlated to the antioxidant capacity. Context The heartwood of Dicorynia guianensis Amsh is resistant to white rot fungi decay, but the mechanism of this Natural Durability is not fully elucidated. Aims: Biochemical studies were carried out in order to better understand the role of extractives in Natural Durability of D. guianensis. Methods: The powders from durable and moderately durable heartwood were extracted with methanol, ethanol, and hot water. The quantity of total phenols, tannins, and flavonoids as well as antioxidant activity, evaluated by 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) were determined using colorimetric methods. Antifungal activity was assessed by using two white rot fungi. The bioactive fractions and compounds were obtained using bio-guided fractionation, HPLC isolation, MS and RMN spectroscopic analyses. Results: Durable woods contain higher amounts of heartwood extract and antioxidant activity. Antioxidant activity was highly correlated with the content of phenolics. The purification of the most antioxidant fraction FII affords the characterization of (+)-catechin (−)-epicatechin, neoastilbin, astilbin, and isoastilbin. Alkaloid fraction FIII exhibits dose-dependent fungistatic activity against Pycnoporus sanguineus Linnaeus and Trametes versicolor Quelet. Conclusion: Phenolic antioxidants and fungistatic alkaloids positively impact the Natural Durability of D. guianensis.
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Rapid prediction of phenolic compounds as chemical markers for the Natural Durability of teak (Tectona grandis Linn f.) heartwood by near infrared spectroscopy
Journal of Near Infrared Spectroscopy, 2014Co-Authors: Florence Niamké, Marie-france Thévenon, Nadine Amusant, Adjumane Aimé Kadio, Augustin Amissa Adima, Christian Jay-allemand, Sophie Nourissier, Gilles ChaixAbstract:Near infrared (NIR) spectroscopy provides rapid and non-destructive analysis of wood properties and composition. In this study, we aimed to use NIR measurement for the prediction of teak phenolic compounds, which are chemical markers for Natural Durability of wood. Twenty-seven teak trees from two geographical zones (Malaysia and Ivory Coast) were used. On ground heartwood samples, the content of total phenolics and individual quinones (tectoquinone, 2-(hydroxymethyl)anthraquinone, 2- anthraquinone carboxylic acid, 1,4-naphthoquinone and 4?,5?-dihydroxy-epiisocatalponol) were determined using high performance liquid chromatography (HPLC). Partial least squares (PLS) regression with NIR spectra on the same samples and phenolic data was used to build NIR models for phenolic contents. The PLS models for the total predicted phenolics and three quinone contents (tectoquinone, 2-(hydroxymethyl)anthraquinone, and 4?,5?- dihydroxy-epiisocatalponol) showed a good ratio of performance to deviation (RPD ? 2.5), strong coefficients of determination (r2 ? 0.8) and the prediction errors were consistent with the reference method. These results demonstrate that NIR spectroscopy can be reliable for the evaluation of total phenolics and individual quinones in teak heartwood wood meal. NIR spectroscopy is a promising technique for rapidly providing information on the quinone contents in teak wood and indirectly for knowing its Natural Durability. This finding leads to a precise, non-destructive tool for teak wood quality evaluation. (Resume d'auteur)
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Relationships between biochemical attributes (non-structural carbohydrates and phenolics) and Natural Durability against fungi in dry teak wood ( Tectona grandis L. f.)
Annals of Forest Science, 2011Co-Authors: Florence Niamké, Nadine Amusant, Gilles Chaix, Nabila Boutahar, Jean-paul Charpentier, Yves Baissac, Augustin Amissa Adima, Séraphin Kati-coulibaly, Christian Jay-allemandAbstract:• Introduction Non-structural carbohydrates and phenolic compounds are implicated in the Natural Durability of wood. In order to find the chemical traits of Natural Durability in teak wood, the radial distribution of phenolics compounds and non-structural carbohydrates were studied in trees ranked by contrasting Natural Durability class against Antrodia sp.
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Relationships between biochemical attributes (non-structural carbohydrates and phenolics) and Natural Durability against fungi in dry teak wood (Tectona grandis L. f.)
Annals of Forest Science, 2011Co-Authors: Florence Niamké, Augustin AmusantAbstract:• Introduction Non-structural carbohydrates and phenolic compounds are implicated in the Natural Durability of wood. In order to find the chemical traits of Natural Durability in teak wood, the radial distribution of phenolics compounds and non-structural carbohydrates were studied in trees ranked by contrasting Natural Durability class against Antrodia sp. • Methods Non-structural carbohydrates were analyzed by spectrophotometry after enzymatic assays and phenolics compounds using HPLC. • Results High concentrations of starch, sucrose, glucose, and fructose were found in the sapwood, whereas only trace amounts were found in the heartwood. In the sapwood, low concentrations of H1 (a hydroxycinnamic acid derivative) were specifically detected. Tectoquinone was also detected in the sapwood but its content increased dramatically in the heartwood. 2-(Hydroxymethyl)anthraquinone and P1, an unidentified compound, were only detected in the heartwood and at high concentrations (>3 mg equivalent 5-methoxyflavone g−1 dry weight. Lower concentrations of 1,4-naphthoquinone, anthraquinone-2-carboxylic acid, and lapachol were also only detected in the heartwood. H1 and tectoquinone present in the sapwood could be considered as phenolic precursors of the synthesis of heartwood toxic phenolics in the heartwood. • Conclusion Correlations between Natural Durability and chemical composition of heartwood (quinone derivatives, P1, and non-structural carbohydrates) suggest that P1, 2-(hydroxymethyl)anthraquinone and tectoquinone could be Natural Durability traits. Heartwood extractives, mainly quinone derivatives, were formed from non-structural carbohydrates which were weakly correlated to Natural Durability.
Gilles Chaix - One of the best experts on this subject based on the ideXlab platform.
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Rapid prediction of phenolic compounds as chemical markers for the Natural Durability of teak (Tectona grandis Linn f.) heartwood by near infrared spectroscopy
Journal of Near Infrared Spectroscopy, 2014Co-Authors: Florence Niamké, Marie-france Thévenon, Nadine Amusant, Adjumane Aimé Kadio, Augustin Amissa Adima, Christian Jay-allemand, Sophie Nourissier, Gilles ChaixAbstract:Near infrared (NIR) spectroscopy provides rapid and non-destructive analysis of wood properties and composition. In this study, we aimed to use NIR measurement for the prediction of teak phenolic compounds, which are chemical markers for Natural Durability of wood. Twenty-seven teak trees from two geographical zones (Malaysia and Ivory Coast) were used. On ground heartwood samples, the content of total phenolics and individual quinones (tectoquinone, 2-(hydroxymethyl)anthraquinone, 2- anthraquinone carboxylic acid, 1,4-naphthoquinone and 4?,5?-dihydroxy-epiisocatalponol) were determined using high performance liquid chromatography (HPLC). Partial least squares (PLS) regression with NIR spectra on the same samples and phenolic data was used to build NIR models for phenolic contents. The PLS models for the total predicted phenolics and three quinone contents (tectoquinone, 2-(hydroxymethyl)anthraquinone, and 4?,5?- dihydroxy-epiisocatalponol) showed a good ratio of performance to deviation (RPD ? 2.5), strong coefficients of determination (r2 ? 0.8) and the prediction errors were consistent with the reference method. These results demonstrate that NIR spectroscopy can be reliable for the evaluation of total phenolics and individual quinones in teak heartwood wood meal. NIR spectroscopy is a promising technique for rapidly providing information on the quinone contents in teak wood and indirectly for knowing its Natural Durability. This finding leads to a precise, non-destructive tool for teak wood quality evaluation. (Resume d'auteur)
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Relationships between biochemical attributes (non-structural carbohydrates and phenolics) and Natural Durability against fungi in dry teak wood ( Tectona grandis L. f.)
Annals of Forest Science, 2011Co-Authors: Florence Niamké, Nadine Amusant, Gilles Chaix, Nabila Boutahar, Jean-paul Charpentier, Yves Baissac, Augustin Amissa Adima, Séraphin Kati-coulibaly, Christian Jay-allemandAbstract:• Introduction Non-structural carbohydrates and phenolic compounds are implicated in the Natural Durability of wood. In order to find the chemical traits of Natural Durability in teak wood, the radial distribution of phenolics compounds and non-structural carbohydrates were studied in trees ranked by contrasting Natural Durability class against Antrodia sp.
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Influence of soil properties on the Natural Durability, extractive content and colour of teak (Tectona grandis L.f.) wood in Togo
2010Co-Authors: Adzo Dzifa Kokutse, Nadine Amusant, Nabila Boutahar, Gilles ChaixAbstract:Togolese teak is highly resistant to pathogen attack, but Natural Durability and wood colour vary according to plantation sites and geographical zones. Therefore, further information concerning the influence of environmental parameters and their effects on teak wood quality is necessary and it could be possible to improve these characteristics through tree breeding and silviculture programs in Togo. In order to examine the influence of soil properties on teak wood characteristics, 321 wood samples issued from 20 trees were exposed to two fungi: Antrodia sp., and Coriolus versicolor. Depending on type of soil in which they grew, trees had been randomly. selected in two different sites in the same climatic area in Togo. The colour parameters of each sample were measured using the CIELAB system and total extractive content was determined using the Accelerated Solvent Extraction (ASE) procedure. Results showed a . significantly lower total extractive content (11.1%) for trees that grew on hydromorphic tropical ferruginous (HTF) sail than trees from drained ferruginous soil (12.8%). Samples from RTF soil were lighter and the redness a* andyellow-blueness b* were significantly higher. Independently of soil quality, aIl the trees were highly durable regarding decay by C. versicolor. With Antrodia sp., 90 % of the trees from both sites were highly durable and only 10% were durable. However, samples from HTF soiI were less durable with regard to the two fimgi. (Resume d'auteur)
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Soil property effects on the Natural Durability, extractive content and colour of teak (Tectona grandis L.f) wood in Togo
2009Co-Authors: Adzo Dzifa Kokutse, Nadine Amusant, Nabila Boutahar, Gilles ChaixAbstract:Togolese teak is highly resistant to pathogen attack, but Natural Durability and wood colour vary according to plantation sites and geographical zones. Therefore, further information concerning the influence of environmental parameters and their effects on teak wood quality is necessary and it could be possible to improve these characteristics through tree breeding and silviculture programs in Togo. In order to examine the influence of soil properties on teak wood characteristics, 321 wood samples issued from 20 trees were exposed to two fungi: #Antrodia sp#., and #Coriolus versicolor#. Depending on type of soil in which they grew, trees had been randomly selected in two different sites in the same climatic area in Togo. The colour parameters of each sample were measured using the CIELAB system and total extractive content was determined using the Accelerated Solvent Extraction (ASE) procedure. Results showed a significantly lower total extractive content (11.1%) for trees that grew on hydromorphic tropical ferruginous (HTF) soil than trees from drained ferruginous soil (12.8%). Samples from HTF soil were lighter and the redness a* and yellow-blueness b* were significantly higher. Independently of soil quality, all the trees were highly durable regarding decay by #C. versicolor#. With #Antrodia sp#., 90 % of the trees from both sites were highly durable and only 10% were durable. However, samples from HTF soil were less durable with regard to the two fungi. (Resume d'auteur)
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Rapid prediction of teak wood Natural Durability using near-infrared spectroscopy
2008Co-Authors: Gilles Chaix, Olivier Monteuuis, Doreen Kim Soh Goh, Adzo Dzifa Kokutse, N.s.a. Derkyi, Adjumane Aimé Kadio, Nabila Boutahar, Henri BailleresAbstract:Near Infrared Spectroscopy (NIRS) is widely used to identify compounds and to assess wood properties based on information drawn from reference methods. Unlike most conventional analytical methods, NIRS is a non-destructive method, requires little or no sample preparation or chemicals and does not produce any chemical waste, requiring disposal. The ability of NIRS to predict teak Natural Durability using solid wood spectra was assessed on a total of 250 wood samples collected from approximately 80 African (Ivory Coast, Ghana, Togo) and 30 Malaysian trees. Natural Durability tests on heartwood were performed in controlled conditions using the fungi Antrodia sp. and Coniophora puteana with beech (Fagus sativa) and pine sapwood (Pinus sylvestris L.) as references. The relative resistance to decay (x -value) expressed as mass loss after four months of biodegradation by the two fungal strains was calculated and Durability classes were estimated according to European standard EN 350-1. It was found that NIR spectroscopy can be used for accurate and fast determination of Natural Durability of a large number of samples. (Resume d'auteur)
Adzo Dzifa Kokutse - One of the best experts on this subject based on the ideXlab platform.
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Influence of soil properties on the Natural Durability, extractive content and colour of teak (Tectona grandis L.f.) wood in Togo
2010Co-Authors: Adzo Dzifa Kokutse, Nadine Amusant, Nabila Boutahar, Gilles ChaixAbstract:Togolese teak is highly resistant to pathogen attack, but Natural Durability and wood colour vary according to plantation sites and geographical zones. Therefore, further information concerning the influence of environmental parameters and their effects on teak wood quality is necessary and it could be possible to improve these characteristics through tree breeding and silviculture programs in Togo. In order to examine the influence of soil properties on teak wood characteristics, 321 wood samples issued from 20 trees were exposed to two fungi: Antrodia sp., and Coriolus versicolor. Depending on type of soil in which they grew, trees had been randomly. selected in two different sites in the same climatic area in Togo. The colour parameters of each sample were measured using the CIELAB system and total extractive content was determined using the Accelerated Solvent Extraction (ASE) procedure. Results showed a . significantly lower total extractive content (11.1%) for trees that grew on hydromorphic tropical ferruginous (HTF) sail than trees from drained ferruginous soil (12.8%). Samples from RTF soil were lighter and the redness a* andyellow-blueness b* were significantly higher. Independently of soil quality, aIl the trees were highly durable regarding decay by C. versicolor. With Antrodia sp., 90 % of the trees from both sites were highly durable and only 10% were durable. However, samples from HTF soiI were less durable with regard to the two fimgi. (Resume d'auteur)
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Soil property effects on the Natural Durability, extractive content and colour of teak (Tectona grandis L.f) wood in Togo
2009Co-Authors: Adzo Dzifa Kokutse, Nadine Amusant, Nabila Boutahar, Gilles ChaixAbstract:Togolese teak is highly resistant to pathogen attack, but Natural Durability and wood colour vary according to plantation sites and geographical zones. Therefore, further information concerning the influence of environmental parameters and their effects on teak wood quality is necessary and it could be possible to improve these characteristics through tree breeding and silviculture programs in Togo. In order to examine the influence of soil properties on teak wood characteristics, 321 wood samples issued from 20 trees were exposed to two fungi: #Antrodia sp#., and #Coriolus versicolor#. Depending on type of soil in which they grew, trees had been randomly selected in two different sites in the same climatic area in Togo. The colour parameters of each sample were measured using the CIELAB system and total extractive content was determined using the Accelerated Solvent Extraction (ASE) procedure. Results showed a significantly lower total extractive content (11.1%) for trees that grew on hydromorphic tropical ferruginous (HTF) soil than trees from drained ferruginous soil (12.8%). Samples from HTF soil were lighter and the redness a* and yellow-blueness b* were significantly higher. Independently of soil quality, all the trees were highly durable regarding decay by #C. versicolor#. With #Antrodia sp#., 90 % of the trees from both sites were highly durable and only 10% were durable. However, samples from HTF soil were less durable with regard to the two fungi. (Resume d'auteur)
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Rapid prediction of teak wood Natural Durability using near-infrared spectroscopy
2008Co-Authors: Gilles Chaix, Olivier Monteuuis, Doreen Kim Soh Goh, Adzo Dzifa Kokutse, N.s.a. Derkyi, Adjumane Aimé Kadio, Nabila Boutahar, Henri BailleresAbstract:Near Infrared Spectroscopy (NIRS) is widely used to identify compounds and to assess wood properties based on information drawn from reference methods. Unlike most conventional analytical methods, NIRS is a non-destructive method, requires little or no sample preparation or chemicals and does not produce any chemical waste, requiring disposal. The ability of NIRS to predict teak Natural Durability using solid wood spectra was assessed on a total of 250 wood samples collected from approximately 80 African (Ivory Coast, Ghana, Togo) and 30 Malaysian trees. Natural Durability tests on heartwood were performed in controlled conditions using the fungi Antrodia sp. and Coniophora puteana with beech (Fagus sativa) and pine sapwood (Pinus sylvestris L.) as references. The relative resistance to decay (x -value) expressed as mass loss after four months of biodegradation by the two fungal strains was calculated and Durability classes were estimated according to European standard EN 350-1. It was found that NIR spectroscopy can be used for accurate and fast determination of Natural Durability of a large number of samples. (Resume d'auteur)
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Rapid prediction of teak wood Natural Durability using near-infrared spectroscopy
2007Co-Authors: Gilles Chaix, Olivier Monteuuis, Doreen Kim Soh Goh, Adzo Dzifa Kokutse, N.s.a. Derkyi, Nabila Boutahar, Henri Bailleres, Christine Baudasse, Adjumane Aimé KadioAbstract:Teak wood is known to be highly durable for wood from Natural forest and less durable for wood from short rotation plantations. Near-infrared spectroscopy (NIRS) is useful for estimating chemical and physico-mechanical properties such as decay resistance. In this study, the Natural Durability of commercially-grown teak wood was determined and correlated with NIRS data for rapid prediction of teak Durability and to address conditions for future applications. (Resume d'auteur)
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Evaluation of Natural Durability of teak wood (Tectona grandis L.f) in plantation in Togo, West Africa
International Forestry Review, 2005Co-Authors: Adzo Dzifa Kokutse, Henri Bailleres, Alexia Stokes, Kouami KokouAbstract:Teak (Tectona grandis L.f) has been introduced in Togo at the beginning of the 20th century and has become the most important timber for exportation. Plantations cover approximately 12000 ha at present. Natural Durability and colour, characteristics that are requested on the international timber market, have been studied in the trees of these plantations. Twelve hundred samples of 26 trees have been tested against four fungi. The results show considerable difference in the intensity of attack. Antrodia sp. and Coriolus versicolor are the fungi that have caused the major damage with losses of up to 20% of dry matter whereas 100% of the samples are classified durable to very durable against Pycnoporus sanguineus and Gloephylum trabeum. The analysis of the colour parameters show that the clarity L* is a negative factor for the Natural Durability of the samples. From the four fungi tested, the clarity allows one to distinguish the Durability class of the sample. The relationship between the red colour a* and yellow b* parameters and Durability exists but they are not sufficiently close to allow for an accurate classification. (Texte integral)
Nabila Boutahar - One of the best experts on this subject based on the ideXlab platform.
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Relationships between biochemical attributes (non-structural carbohydrates and phenolics) and Natural Durability against fungi in dry teak wood ( Tectona grandis L. f.)
Annals of Forest Science, 2011Co-Authors: Florence Niamké, Nadine Amusant, Gilles Chaix, Nabila Boutahar, Jean-paul Charpentier, Yves Baissac, Augustin Amissa Adima, Séraphin Kati-coulibaly, Christian Jay-allemandAbstract:• Introduction Non-structural carbohydrates and phenolic compounds are implicated in the Natural Durability of wood. In order to find the chemical traits of Natural Durability in teak wood, the radial distribution of phenolics compounds and non-structural carbohydrates were studied in trees ranked by contrasting Natural Durability class against Antrodia sp.
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Influence of soil properties on the Natural Durability, extractive content and colour of teak (Tectona grandis L.f.) wood in Togo
2010Co-Authors: Adzo Dzifa Kokutse, Nadine Amusant, Nabila Boutahar, Gilles ChaixAbstract:Togolese teak is highly resistant to pathogen attack, but Natural Durability and wood colour vary according to plantation sites and geographical zones. Therefore, further information concerning the influence of environmental parameters and their effects on teak wood quality is necessary and it could be possible to improve these characteristics through tree breeding and silviculture programs in Togo. In order to examine the influence of soil properties on teak wood characteristics, 321 wood samples issued from 20 trees were exposed to two fungi: Antrodia sp., and Coriolus versicolor. Depending on type of soil in which they grew, trees had been randomly. selected in two different sites in the same climatic area in Togo. The colour parameters of each sample were measured using the CIELAB system and total extractive content was determined using the Accelerated Solvent Extraction (ASE) procedure. Results showed a . significantly lower total extractive content (11.1%) for trees that grew on hydromorphic tropical ferruginous (HTF) sail than trees from drained ferruginous soil (12.8%). Samples from RTF soil were lighter and the redness a* andyellow-blueness b* were significantly higher. Independently of soil quality, aIl the trees were highly durable regarding decay by C. versicolor. With Antrodia sp., 90 % of the trees from both sites were highly durable and only 10% were durable. However, samples from HTF soiI were less durable with regard to the two fimgi. (Resume d'auteur)
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Soil property effects on the Natural Durability, extractive content and colour of teak (Tectona grandis L.f) wood in Togo
2009Co-Authors: Adzo Dzifa Kokutse, Nadine Amusant, Nabila Boutahar, Gilles ChaixAbstract:Togolese teak is highly resistant to pathogen attack, but Natural Durability and wood colour vary according to plantation sites and geographical zones. Therefore, further information concerning the influence of environmental parameters and their effects on teak wood quality is necessary and it could be possible to improve these characteristics through tree breeding and silviculture programs in Togo. In order to examine the influence of soil properties on teak wood characteristics, 321 wood samples issued from 20 trees were exposed to two fungi: #Antrodia sp#., and #Coriolus versicolor#. Depending on type of soil in which they grew, trees had been randomly selected in two different sites in the same climatic area in Togo. The colour parameters of each sample were measured using the CIELAB system and total extractive content was determined using the Accelerated Solvent Extraction (ASE) procedure. Results showed a significantly lower total extractive content (11.1%) for trees that grew on hydromorphic tropical ferruginous (HTF) soil than trees from drained ferruginous soil (12.8%). Samples from HTF soil were lighter and the redness a* and yellow-blueness b* were significantly higher. Independently of soil quality, all the trees were highly durable regarding decay by #C. versicolor#. With #Antrodia sp#., 90 % of the trees from both sites were highly durable and only 10% were durable. However, samples from HTF soil were less durable with regard to the two fungi. (Resume d'auteur)
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Rapid prediction of teak wood Natural Durability using near-infrared spectroscopy
2008Co-Authors: Gilles Chaix, Olivier Monteuuis, Doreen Kim Soh Goh, Adzo Dzifa Kokutse, N.s.a. Derkyi, Adjumane Aimé Kadio, Nabila Boutahar, Henri BailleresAbstract:Near Infrared Spectroscopy (NIRS) is widely used to identify compounds and to assess wood properties based on information drawn from reference methods. Unlike most conventional analytical methods, NIRS is a non-destructive method, requires little or no sample preparation or chemicals and does not produce any chemical waste, requiring disposal. The ability of NIRS to predict teak Natural Durability using solid wood spectra was assessed on a total of 250 wood samples collected from approximately 80 African (Ivory Coast, Ghana, Togo) and 30 Malaysian trees. Natural Durability tests on heartwood were performed in controlled conditions using the fungi Antrodia sp. and Coniophora puteana with beech (Fagus sativa) and pine sapwood (Pinus sylvestris L.) as references. The relative resistance to decay (x -value) expressed as mass loss after four months of biodegradation by the two fungal strains was calculated and Durability classes were estimated according to European standard EN 350-1. It was found that NIR spectroscopy can be used for accurate and fast determination of Natural Durability of a large number of samples. (Resume d'auteur)
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Rapid prediction of teak wood Natural Durability using near-infrared spectroscopy
2007Co-Authors: Gilles Chaix, Olivier Monteuuis, Doreen Kim Soh Goh, Adzo Dzifa Kokutse, N.s.a. Derkyi, Nabila Boutahar, Henri Bailleres, Christine Baudasse, Adjumane Aimé KadioAbstract:Teak wood is known to be highly durable for wood from Natural forest and less durable for wood from short rotation plantations. Near-infrared spectroscopy (NIRS) is useful for estimating chemical and physico-mechanical properties such as decay resistance. In this study, the Natural Durability of commercially-grown teak wood was determined and correlated with NIRS data for rapid prediction of teak Durability and to address conditions for future applications. (Resume d'auteur)