Extraction and Characterisation of lignin from soya bean stems and sorghum stalks
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Date
2024
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Busitema University
Abstract
Lignocellulosic biomass has been known for potential use to produce chemicals and biomaterials. Lignin is a three-dimensional, highly cross-linked macromolecule composed of three types of substituted phenols which include: coniferyl, sinapyl, and p-coumaryl alcohols by enzymatic polymeration, yielding a vast number of functional groups and linkages. This research was intended to extract lignin from soya bean stems and sorghum stalks by soda pulping. Samples were chopped manually in sizes of about 3-5 cm, screened to get rid of the fine, clean with distilled water to eliminate adhered soil. The materials were dried at room temperature in the laboratory. The dry materials were soaked in water at room temperature. Then the black liquor was obtained and different treatments were carried out in order to obtain the lignin. It was found that lignin obtained from sorghum stalks provided the greatest yield of …16.5%…. compared to lignin from soya bean stems of …12.5%...by weight yielding low lignin. It was also found out that the lignin obtained from sorghum stalks were more hydrophilic due to its higher content of hydroxyl group, sorghum stalk lignin was more soluble in water and hexane, making it a better choice for applications where they are preferred as solvents. On the other hand, lignin obtained from soya bean stems were compatible with polar solvents due to its phenolic groups. Soya bean stem lignin was more soluble in ethanol and methanol making it a better choice for application where they are needed to be used.
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Musasizi, E. (2024). Extraction and characterisation of lignin from soya bean stems and sorghum stalks [Undergraduate, Research Report]. Busitema University.