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Thermal, Morphological and Cytotoxicity Characterization of Hardwood Lignins Isolated by In-Situ Sodium Hydroxide-Sodium Bisulfate Method

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Document pages: 12 pages

Abstract: In the present work, lignin is isolated from three different agro-industrial waste, sweetsorghum, rice straw and sugarcane bagasseusing in-situ sodium hydroxide-sodiumbisulfate methodology. Characterization was performed using fourier transform infrared analysis (FTIR), scanelectron microscopy (SEM), thermo gravimetricanalysis (TGA). The SEM micrographs showed sponge-likestructure except for sugarcane bagasse lignin reveals rock-like structure. The FTIR indicates the presence of hydroxyl,carbonyl and methoxyl groups in thelignin structure. TGA thermograms were relatively same and sugarcane bagasse lignin was found the most thermallystable up to 201˚C as compared to both of soda and kraft sugarcane bagasselignin and its maximal temperature degradation rate DTGmax was foundat 494˚C while 450˚C, 464˚C in addition to thermal stabilities up to 173˚C and180˚C for sweet sorghum and rice straw lignins respectively. All ligninsexhibited low percentage of bio-char lessthan 10 remained unvalotilized at theend of the thermogravimetric analysis at 800˚C in nitrogen atmosphere, revealing a high conversion yield into volatiles. Moreover, all lignin samplesdepicted higher cytotoxic potential towards lung cancer cell line (A549), IC50:12 - 17 μg ml. These findings suggest that the in-situ separated lignins would be good candidates for pyrolysis,polymer composites preparations and seemto be promising natural anti-cancer agents despite its main utilization as the caner drug delivery substrates.

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