Bamboo was subjected to mild acetosolv process under atmospheric pressure to obtain cellulosic pulp, water-soluble fraction, and acetic acid lignin. With an increase of HCl dosage from 1.0 to 2.0 and 4.0%, the yield of acetic acid lignin increased from 12.10 to 17.38 and 20.21%, respectively. The results revealed that acetic acid lignins had lower impurities (carbohydrates 2.48�4.56%) than MWL. The acetic acid lignins had weight-average molecular weights ranging from 4870 to 5210 g/mol, less than half of that of MWL (13000 g/mol), mainly due to the degradation of lignin as evidenced by 1H NMR and HSQC spectroscopy. The strong antioxidant activity of acetic acid lignins arose mainly from the significant increase of phenolic hydroxyls during the fractionation process. It was suggested that the lignin product from acetosolv process was a promising feedstock for polymer applications.

Mild acetosolv process for bamboo fractionation: Structure and antioxidant activity of the extracted lignin

243rd National Meeting (2012)

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