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Effect of aging on lignin content, composition and enzymatic saccharification in Corymbia hybrids and parental taxa between years 9 and 12

Healey, Adam L. and Lupoi, Jason S. and Lee, David J. and Sykes, Robert W. and Guenther, Joel M. and Tran, Kim and Decker, Stephen R. and Singh, Seema and Simmons, Blake A. and Henry, Robert J. (2016) Effect of aging on lignin content, composition and enzymatic saccharification in Corymbia hybrids and parental taxa between years 9 and 12. Biomass and Bioenergy, 93 . pp. 50-59. ISSN 0961-9534

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Article Link(s): http://dx.doi.org/10.1016/j.biombioe.2016.06.016

Publisher URL: http://www.sciencedirect.com/science/article/pii/S0961953416302185

Abstract

Corymbia (a eucalypt) is an important forestry genus and a potential lignocellulosic bioenergy feedstock. The composition of the lignocellulosic cell wall significantly impacts pretreatment efficiency and conversion to biofuel but is variable and changes with age. In this study, we estimated Klason lignin content, composition, and monosaccharide (glucose and xylose) release after enzymatic saccharification of untreated and hydrothermally pretreated biomass from Corymbia parental species Corymbia torelliana (CT), Corymbia citriodora subsp. variegata (spotted gum; CCV), and interspecific F1 hybrids (CT × CCV) at ages 9 and 12 years from planting. Analysis of lignin composition derived from syringyl/guaiacyl monolignols (S/G) found significant differences among taxa, with CT S/G ratios (2.2 and 2.0) being significantly lower than CCV (2.6 and 2.3) or hybrids (2.5 and 2.3) at ages 9 and 12 respectively. In general, enzymatic saccharification yields from untreated biomass were significantly different among taxa, with CT (113 and 75 mg g−1) and hybrids (108 and 81 mg g−1) yielding significantly higher glucose from untreated biomass than CCV (82 and 56 mg g−1) at ages 9 and 12 respectively. Comparison of traits within taxa between ages 9 and 12 found S/G ratios and glucose yields from untreated biomass were significantly lower in CT, CCV and hybrid taxa. In conclusion, the formation of lignocellulosic cell walls is complex, influenced by genetics and age of material, requiring optimization of rotation age for biofuel production and other industrial processes.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Corymbia Saccharification Lignin S/G Bioproducts Biofuels
Subjects:Forestry > Research. Experimentation
Forestry > Exploitation and utilization
Deposited On:11 Jan 2017 03:46
Last Modified:11 Jan 2017 03:46

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