This article reports the isolation and structural investigation of an acidic polysaccharide of the seeds of Prunus armeniaca (apricot) - a plant of commercial importance. The polysaccharide is composed of three sugars - mannose (50%), glucose (37.5%) and glucuronic acid (12.5%). The results of methylation analysis, partial depolymerisation, Smith degradation and NMR spectroscopic studies indicate a branched structure consisting of a straight chain of mainly alpha-(1 --> 3)mannan, which is interspersed with 4-O-(beta-D-mannopyranosyl)glucuronic acid residues. The side chain is bound to the alpha-mannan chain in the form of a trisaccharide of the glucose.
Abstract:The hemicellulose from sugarcane bagasse was extracted sequentially with steam treatment followed by alkali and were characterized by chemical methods, SEC-MALLS, FT-IR and 13C NMR. The hemicellulose from steam pre-treatment was found to contain gluco-arabinoxylans while alkaline peroxide extraction yielded predominately linear arabinoxylans with varying amount of lignin. These arabinoxylans with high lignin content were tested for barrier properties on cardboards, to be used as food packaging materials. Due to lignin content, these hemicelluloses were found to increase the water barrier properties of the cardboard.
-To find reliable analytical methods to ensure an accurate analysis of structural compounds in plants is always challenging due to structural diversity of constituents in different lignocellulosics. The non-cellulosic carbohydrate in sugarcane baggase was analysed by acid methanolysis followed by gc analysis. Our results showed that 3 hours of acid methanolysis is more sufficient to obtain high yield of monomeric pentoses and uronic acid units. To determine total carbohydrate content the optimum condition for acid hydrolysis was found by the comparison of reaction kinetics using different acids (sulfuric, trifluoroacetic and ortho-phosphoric acid) at different concentrations and different reaction time followed by HPLC and GC analysis. The lignin content was determined by conventional klason method as well as by AcBr method. The effect of perchloric acid on lignin determination by AcBr method has also been evaluated and the optimum condition for sugarcane baggase has been found. Acetyl group content in non-cellulosic carbohydrate was analysed after mild alkaline hydrolysis followed by hplc.
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