Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 113, Issue -, Pages 368-375Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2018.01.046
Keywords
Acid-pretreatment; Monosaccharide; Lignin; Pseudo-lignin; Cellulase adsorption
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Funding
- National Natural Science Foundation of China [31570561]
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)
- Natural Science Foundation of Jiangsu Province [BK20150874]
- Doctorate Fellowship Foundation of Nanjing Forestry University
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Pseudo-lignin is defined as aromatic material, which could be formed through dehydration synthesis and aromatisation of carbohydrate. In this work, dilute sulfuric acid was carried out to treat monosaccharides and holocellulose to generate pseudo-lignin and the residual lignin (RL) in acid-pretreated bamboo was isolated. The structural informations of pseudo-lignin were assayed by nondestructive techniques (SEM, FTIR, and P-31 NMR). Meanwhile, the nonproductive adsorption performance of pseudo-lignin and cellulase was evaluated, taking RL as the comparison. Results showed that pseudo-lignin represented sensible droplets and was consist of aliphatics, carbonyl and aromatic structures. The amounts of aliphatic hydroxyl groups and carboxylic acid in pseudo-lignin were 0.61-0.79 mmol/g and 0.64-0.68 mmol/g, respectively. Total OH content of RL (3.51 mmol/g) was higher than pseudo-lignins (2.52-3.05 mmol/g). Due to the lower negative surface charge, hydrophobic nature, Langmuir constant (K) and binding strength (R) of pseudo-lignin, it represented weaker negative impact on enzymes than RL.
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