Characterization of Lake Biwa Macrophytes in their Chemical Composition
Harifara RABEMANOLONTSOA, Shiro SAKA
Macrophytes growing in Lake Biwa such as ofusa-mo (Myriophyllum aquaticum), sennin-mo (Potamogeton maackianus), okanada-mo (Egeria densa), kuro-mo (Hydrilla verticillata) and kokanada-mo (Elodea nuttallii) were characterized in their chemical composition in order to evaluate their potential as biorefinery feedstocks. As a result, cellulose and hemicellulose contents were found to be in a range, respectively, between 227 - 436 g/kg and 88 - 194 g/kg, while lignin content was from 71 to 175 g/kg. In more detail, hemicelluloses were mostly composed of xylose, galactose, mannose and arabinose in relatively equal amounts, whereas lignin was composed of guaiacylpropane, syringylpropane and p-hydroxylphenylpropane moieties, while ash and protein were remarkably high to be 105-223 g/kg and 137-229 g/kg, respectively. Although inorganics as shown by ash might be a limitation in the utilization of the macrophytes as biorefinery feedstocks, cellulose, hemicellulose, lignin and protein are available as raw materials for the production of a wide range of value-added biobased products.
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