Systematic study of the reactions involved in the determination of lignin and holocellulose in bagasse and straw from sugar cane samples / Estudo sistemático das reações envolvidas na determinação dos teores de lignina e holocelulose em amostras de bagaço e palha de cana-de-açúcar

AUTOR(ES)

Karen Marabezi

DATA DE PUBLICAÇÃO

2009

RESUMO

The analytical methods currently used for chemical characterization of lignocellulosic materials were developed for wood and are applied with minor modifications for sugar cane bagasse and straw analysis. The lack of specific methodology for these materials leads to inadequate results and hamper both the planning and the interpretation of results. Thus, the main aim of this work is to develop specific analytical methodologies to the chemical characterization of sugar cane bagasse and straw. The determination of lignin was studied by the hydrolysis and dissolution of the polysaccharide fraction in sulfuric acid solution. The insoluble fraction was analyzed by elemental analysis, Fourier Transform Infrared (FT-IR), Carbon-13 nuclear magnetic resonance spectroscopy (13C NMR), Gel permeation chromatography (GPC) and Thermogravimetric analysis (TGA). The sugars and derivatives of these hydrolysates were analyzed by High performance liquid chromatography (HPLC). It was also performed a complementary analysis from the holocellulose content determinations in order to check the values obtained by the klason procedure. The results showed the dependence of sulfuric acid concentration on lignin content determinations and the role of condensation reactions in the lignin characteristics. Despite the similarities in chemical composition, klason lignins obtained from straw exhibited very low molar masses. Preliminary results obtained from holocellulose determinations showed also the need for optimized oxidation procedures in order to be successful applied to sugar cane bagasse analysis.

ASSUNTO(S)

cana-de-açúcar hidrólise ácida acid hydrolysis sugar cane lignin lignina

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