Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/9228
Título: Caracterização da casca da teca (Tectona grandis L.f) como potencial fonte de produtos de valor acrescentado
Autor: Baptista, Isabel Alexandra Marques
Orientador: Pereira, Helena Margarida Nunes
Miranda, Isabel Maria Sanches
Palavras-chave: Tectona grandis
teak bark
biorefinery
anatomy
chemical composition
fractionation
Data de Defesa: 2015
Editora: ISA/UL
Citação: Baptista, I.A.M. - Caracterização da casca da teca (Tectona grandis L.f) como potencial fonte de produtos de valor acrescentado. Lisboa: ISA, 2015, 83 p.
Resumo: The anatomical and chemical characterization of the bark of mature trees of Tectona grandis from East Timor was made as well as its fractionation and fraction characterization. Teak bark is composed of secondary phloem, a thin layer of periderm cells and a narrow rhytidome. The phloem showed an orderly stratification with tangential bands of fibres in concentric rings alternating with thin bands of axial parenchyma and sieve tube elements. The bark fractured easily into clean particles, yielding low fines with 64.4% of the particles over 2 mm. The mean chemical composition of teak bark was: ash 18.5% (mainly calcium representing 93% of the total), total extractives 12.4% (2.2% non-polar and 10.2% polar compounds), lignin 19.8% and suberin 2.0%. The polysaccharides, corresponding to approximately 47%, are predominantly glucose (60.3% of total neutral monosaccharides) and xylose (20.3%). The content of rhamnose was also comparatively high (5.1%). Extractives were higher in the fines, about 30% more than in the coarse fraction. Lignin content and monosaccharide composition were similar in the different bark fractions. A difference between fractions was found for suberin content which was lower in the fines: 0.6% and 3.5% in the fine and medium fractions, respectively
Descrição: Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/9228
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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