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Release profiles of polyphenols from cellulose-lignin (CL) hydrogels in water:ethanol medium, at 37 °C. The lignin contents from CL1 to CL5 are 25%, 33%, 50%, 67%, and 75%, and the average pore sizes are 203 μm, 215 μm, 233 μm, 307 μm, and 431 μm, respectively (reproduced from Ref. [24] with permission from Elsevier).
