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Thermogravimetric (TG) curves of lignin samples obtained from a thermogravimetric analysis (TGA). BS_Soda Lignin, CP_Soda-AQ Lignin, WS_Soda Lignin and LL_Soda-AQ Lignin refer to the lignin samples isolated from barley straw, Chamaecytisus proliferus, wheat straw and Leucaena leucocephala, respectively.
