Caractérisation physico-chimique de bois et d’écorces de Betula alleghaniensis et Acer saccharum de différentes vigueurs

Authors: St-Pierre, François
Advisor: Achim, AlexisStevanovic-Janezic, Tatjana
Abstract: Forests of South-West Québec, Canada, are rich in yellow birch (Betula alleghaniensis) and sugar maple (Acer saccharum). Past forest practices were aiming to harvest the superior quality and higher value logs via selective cuttings, which resulted in a decrease of the general vigor of the trees left standing in the forests. Current regulations require the foresters to harvest preferentially low vigor trees in order to restore the quality of the forests. These low vigor trees, which are often less suitable for value-added products such as flooring or furniture, are also generally of a low economic value. The addition of an ethanolic extraction of the wood and bark tissues to a currently applied processing approach was studied in order to assess its feasibility with trees of different vigor. Wood and bark tissues were collected from vigorous (references) and non-vigorous dying trees (fungus infected or with very poor foliage) and were extracted with ethanol using two different methods: maceration assisted and an ultrasound assisted extraction. The extracts were characterized for their total phenols, proanthocyanidins, flavonoids, hydroxycinnamic acids, triterpenes and phytosterols content. Tissues were characterized before and after extraction for their calorific value, organic composition, ash content and ash mineral composition. While much variation was observed between trees, the ethanolic extractions did not affect the combustion properties of the tissues, while bringing a significant contribution in polyphenols, triterpenes and phytosterols - all molecules having potential applications in nutraceutics, pharmaceutics or cosmeceutics - no matter the vigor of the tree at the source of the tissues or the extraction method employed. The ethanolic extraction of wood and bark coming from low vigor yellow birch and sugar maple can be considered as a mean to add value to the resource.
Document Type: Mémoire de maîtrise
Issue Date: 2012
Open Access Date: 18 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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