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Title: Effect of Dilute Acetic Acid Hydrolysis on Xylooligosaccharide Production and the Inhibitory Effect of Cellulolytic Enzyme Lignin from Poplar

Journal Article · · ACS Sustainable Chemistry & Engineering
 [1];  [2];  [2];  [2]; ORCiD logo [3];  [2]; ORCiD logo [4]; ORCiD logo [1]
  1. Northwest A&F Univ., Shaanxi (China); Nanjing Forestry Univ. (China)
  2. Northwest A&F Univ., Shaanxi (China)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences
  4. Nanjing Forestry Univ. (China)

Acetic acid (AC) hydrolysis has been reported to prepare xylooligosaccharides (XOS) from poplar. However, the influence of AC hydrolysis on the lignin structure changes is not clear, which is important for the following enzymatic hydrolysis of poplar. Herein, AC was used to produce XOS, and cellulase adsorption on cellulolytic enzyme lignin (CEL) from AC-hydrolyzed poplar and its inhibitory effect on two commercial cellulase preparations were investigated. AC hydrolysis gave a XOS yield of 39.8% from poplar. After AC hydrolysis at 170 °C, the hydrophobicity and ζ-potential of CEL decreased to 2.3 L/g and 14.8 mV, respectively. The adsorption strength of CTec2 on CEL samples did not increase by AC hydrolysis, and the inhibitory effect of CEL on Celluclast 1.5L and β-glucosidase was observed, but not on CTec2. CEL samples improved the lytic polysaccharide monooxygenase (LPMO) activity of the enzymatic hydrolysis by CTec2. After CEL samples were added in enzymatic hydrolysis, the free filter paper activity of Celluclast 1.5L and β-G retained in the enzymatic hydrolysate decreased from 60.5 to 29.3–42.9%. The addition of CEL samples in enzymatic hydrolysis could not decrease the free filter paper activity of CTec2 retained in the enzymatic hydrolysate. In the enzymatic hydrolysis with CEL samples, higher glucose yields were obtained by CTec2 than those by Celluclast 1.5L and β-glucosidase. This work will help to understand the structure and inhibitory effects of AC-CELs and guide the development of AC hydrolysis for the production of XOS and monosaccharides from poplar.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; National Key R&D Program of China; National Natural Science Foundation of China
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1843674
Journal Information:
ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 34 Vol. 9; ISSN 2168-0485
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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