Pre-treatment of eucalypts biomass towards enzymatic saccharification

Magalhães, Washington Luiz Esteves; Helm, Cristiane Vieira; Silva, Patrı́cia; Lima, Edson Alves de; Hoffman, Kleber; Higa, Amanda; Lima, Tielidy

doi:10.1186/1753-6561-5-s7-p116

Cited by 4 publications

(4 citation statements)

References 4 publications

(1 reference statement)

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“…Ash content is detrimental to liquid fuel conversion processes (as non-biodegradable residue) as well as negatively affecting the calorific value of wood and plant processing costs from thermo-chemical conversion (McKendry, 2002; Jørgensen et al, 2007). Eucalyptus and Corymbia have been characterized as possessing low ash content (<1%), (Guerrero et al, 2005; Magalhães et al, 2011; Çetrinköl et al, 2012), which decreases with tree age (Kumar et al, 2010). …”

Section: Discussionmentioning

confidence: 99%

Evaluation of Relationships between Growth Rate, Tree Size, Lignocellulose Composition, and Enzymatic Saccharification in Interspecific Corymbia Hybrids and Parental Taxa

Healey

Lee

Lupoi³

et al. 2016

Front. Plant Sci.

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In order for a lignocellulosic bioenergy feedstock to be considered sustainable, it must possess a high rate of growth to supply biomass for conversion. Despite the desirability of a fast growth rate for industrial application, it is unclear what effect growth rate has on biomass composition or saccharification. We characterized Klason lignin, glucan, and xylan content with response to growth in Corymbia interspecific F1 hybrid families (HF) and parental species Corymbia torelliana and C. citriodora subspecies variegata and measured the effects on enzymatic hydrolysis from hydrothermally pretreated biomass. Analysis of biomass composition within Corymbia populations found similar amounts of Klason lignin content (19.7–21.3%) among parental and hybrid populations, whereas glucan content was clearly distinguished within C. citriodora subspecies variegata (52%) and HF148 (60%) as compared to other populations (28–38%). Multiple linear regression indicates that biomass composition is significantly impacted by tree size measured at the same age, with Klason lignin content increasing with diameter breast height (DBH) (+0.12% per cm DBH increase), and glucan and xylan typically decreasing per DBH cm increase (-0.7 and -0.3%, respectively). Polysaccharide content within C. citriodora subspecies variegata and HF-148 were not significantly affected by tree size. High-throughput enzymatic saccharification of hydrothermally pretreated biomass found significant differences among Corymbia populations for total glucose production from biomass, with parental Corymbia torelliana and hybrids HF-148 and HF-51 generating the highest amounts of glucose (~180 mg/g biomass, respectively), with HF-51 undergoing the most efficient glucan-to-glucose conversion (74%). Based on growth rate, biomass composition, and further optimization of enzymatic saccharification yield, high production Corymbia hybrid trees are potentially suitable for fast-rotation bioenergy or biomaterial production.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Relationships between Growth Rate, Tree Size, Lignocellulose Composition, and Enzymatic Saccharification in Interspecific Corymbia Hybrids and Parental Taxa

Healey

Lee

Lupoi³

et al. 2016

Front. Plant Sci.

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“…This makes the fibres more accessible to the enzymes and increases the production of fermentable sugars in the enzymatic hydrolysis . An example is pre‐treatment with green liquor, based on the adaptation of the kraft pulping process used in pulp and paper mills . The delignification process promoted by the liquor is adapted for the production of lignocellulosic ethanol from the wood, instead of cellulose pulp production .…”

Section: Introductionmentioning

confidence: 99%

“…An example is pre‐treatment with green liquor, based on the adaptation of the kraft pulping process used in pulp and paper mills . The delignification process promoted by the liquor is adapted for the production of lignocellulosic ethanol from the wood, instead of cellulose pulp production . This approach could increase the flexibility of industrial plants, since they could switch to manufacturing the most attractive product, according to the current economic scenario .…”

Section: Introductionmentioning

confidence: 99%

“…The delignification process promoted by the liquor is adapted for the production of lignocellulosic ethanol from the wood, instead of cellulose pulp production . This approach could increase the flexibility of industrial plants, since they could switch to manufacturing the most attractive product, according to the current economic scenario . It is possible that mills could be transformed into biorefineries, reducing initial investments and operating costs …”

Section: Introductionmentioning

confidence: 99%

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Effect of phenolic compounds on bioconversion of glucose to ethanol by yeast Saccharomyces cerevisiae PE‐2

2018

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The bioconversion of lignocellulosic biomasses to ethanol consists of three main steps: pre‐treatment, enzymatic hydrolysis, and fermentation by microorganisms. Most pre‐treatments induce the formation of substances with a potential inhibitory effect on the microbial metabolism, which may hinder the process. The objective of this study was to investigate the behaviour of Saccharomyces cerevisiae PE‐2 yeast in the presence of four phenolic compounds (vanillin, syringaldehyde, syringic acid, and acetosyringone) resulting from the alkaline pre‐treatment of eucalyptus with green liquor. Eucalyptus is a fast‐growing tree, widely exploited by the paper and pulp industry in Brazil. It was observed that yeast growth and glucose assimilation were affected to an extent directly proportional to the initial amount of vanillin in the medium. Syringaldehyde in a concentration of 1.0 g/L had an adverse effect on the fermentation parameters related to ethanol production, which exhibited a decrease of approximately 50 %. When syringic acid and acetosyringone were used, although the cell growth and glucose consumption profiles were similar to those of the control, they inhibited the conversion at concentrations of 0.1 and 1.0 g/L.

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Structural and Chemical Characterization of Hardwood from Tree Species with Applications as Bioenergy Feedstocks

et al. 2012

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Eucalypt species are a group of flowering trees widely used in pulp production for paper manufacture. For several decades, the wood pulp industry has focused research and development efforts on improving yields, growth rates and pulp quality through breeding and the genetic improvement of key tree species. Recently, this focus has shifted from the production of high quality pulps to the investigation of the use of eucalypts as feedstocks for biofuel production. Here the structure and chemical composition of the heartwood and sapwood of Eucalyptus dunnii, E. globulus, E. pillularis, E. urophylla, an E. urophylla-E. grandis cross, Corymbia citriodora ssp. variegata, and Acacia mangium were compared using nuclear magnetic resonance spectroscopy (NMR), X-ray diffraction (XRD) and biochemical composition analysis. Some trends relating to these compositions were also identified by Fourier transform near infrared (FT-NIR) spectroscopy. These results will serve as a foundation for a more comprehensive database of wood properties that will help develop criteria for the selection of tree species for use as biorefinery feedstocks.

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Pre-treatment of eucalypts biomass towards enzymatic saccharification

Cited by 4 publications

References 4 publications

Evaluation of Relationships between Growth Rate, Tree Size, Lignocellulose Composition, and Enzymatic Saccharification in Interspecific Corymbia Hybrids and Parental Taxa

Evaluation of Relationships between Growth Rate, Tree Size, Lignocellulose Composition, and Enzymatic Saccharification in Interspecific Corymbia Hybrids and Parental Taxa

Effect of phenolic compounds on bioconversion of glucose to ethanol by yeast Saccharomyces cerevisiae PE‐2

Structural and Chemical Characterization of Hardwood from Tree Species with Applications as Bioenergy Feedstocks

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