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Physicochemical Changes of Cellulose and Their Influences on Populus trichocarpa Digestibility after Different Pretreatments

Journal Article · · BioResources
 [1];  [2];  [3];  [4];  [3];  [3];  [3];  [5];  [6]
  1. Hubei Univ. of Technology, Wuhan (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); State Univ. of New York College of Environmental Science and Forestry, Syracuse, NY (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); State Univ. of New York College of Environmental Science and Forestry, Syracuse, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Hubei Univ. of Technology, Wuhan (China)
+ Show Author Affiliations

Pretreatment is commonly used to reduce recalcitrance of the lignin-carbohydrate matrix. In this study, leading pretreatment technologies, including dilute sulfuric acid, liquid hot water, alkaline, and organosolv pretreatments, were applied to the selected Populus trichocarpa genotype with relatively low lignin content to elucidate cellulose physicochemical property changes and digestibility-related factors. Pretreated Populus trichocarpa (BESC 131) exhibited higher accessibility and glucose yield than the untreated biomass. Chemical composition and Fourier transform infrared (FTIR) analysis results revealed that hemicellulose and lignin were removed to a varying extent depending on the pretreatment techniques applied. Here, the degree of polymerization of the cellulose was decreased to the largest extent after dilute acid pretreatment, followed by organosolv, alkaline, and liquid hot water pretreatments. Cellulose crystallinity index was slightly changed after the pretreatments; however, its differences were not remarkable between those pretreatment techniques. Among four different pretreatments, organosolv was the most effective pretreatment technology in terms of sugar release, which was three times higher than that of the untreated native biomass. Among all of the tested cell wall traits, the lignin content of Populus trichocarpa was the most remarkable feature associated with glucose release, though Populus trichocarpa recalcitrance was not solely dependent on any single factor.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1606832
Journal Information:
BioResources, Journal Name: BioResources Journal Issue: 4 Vol. 14; ISSN 1930-2126
Publisher:
NC State UniversityCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

59 BASIC BIOLOGICAL SCIENCES
Alkali pretreatment
Cellulose characterization
Dilute acid pretreatment
Liquid hot water pretreatment
Organosolv pretreatment
Populus trichocarpa