Investigation of different pretreatment methods of Mediterranean-type ecosystem agricultural residues: characterisation of pretreatment products, high-solids enzymatic hydrolysis and bioethanol production

Nitsos, Christos; Μάτσακας, Λεωνίδας; Triantafyllidis, Konstantinos S.; Christakopoulos, Paul

doi:10.1080/17597269.2017.1378988

Cited by 43 publications

(28 citation statements)

References 48 publications

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“…Due to the fact that these sources of sugar can also serve as food and animal feed, the use of sugars from lignocellulose presents an attractive alternative. Sources of lignocellulosic biomass include agricultural wastes and by-products, forest biomass, energy crops, and municipal waste [43][44][45]. The use of lignocellulosic materials as a source of fermentable sugars requires a pretreatment step (to disrupt the rigid structure of lignocellulosic biomass), followed by enzymatic hydrolysis of the insoluble carbohydrates in order to release soluble sugars.…”

Section: Production Of 3hp From Sugarsmentioning

confidence: 99%

Biological Production of 3-Hydroxypropionic Acid: An Update on the Current Status

et al. 2018

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Abstract:The production of high added-value chemicals from renewable resources is a necessity in our attempts to switch to a more sustainable society. 3-Hydroxypropionic acid (3HP) is a promising molecule that can be used for the production of an important array of high added-value chemicals, such as 1,3-propanediol, acrylic acid, acrylamide, and bioplastics. Biological production of 3HP has been studied extensively, mainly from glycerol and glucose, which are both renewable resources. To enable conversion of these carbon sources to 3HP, extensive work has been performed to identify appropriate biochemical pathways and the enzymes that are involved in them. Novel enzymes have also been identified and expressed in host microorganisms to improve the production yields of 3HP. Various process configurations have also been proposed, resulting in improved conversion yields. The intense research efforts have resulted in the production of as much as 83.8 g/L 3HP from renewable carbon resources, and a system whereby 3-hydroxypropionitrile was converted to 3HP through whole-cell catalysis which resulted in 184.7 g/L 3HP. Although there are still challenges and difficulties that need to be addressed, the research results from the past four years have been an important step towards biological production of 3HP at the industrial level.

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Section: Production Of 3hp From Sugarsmentioning

confidence: 99%

Biological Production of 3-Hydroxypropionic Acid: An Update on the Current Status

et al. 2018

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“…In addition, it allows the recovery of a significant portion of hemicellulose as sugars and/or the respective furans and organic acids (i.e., furfural, HMF, levulinic and formic acids, etc.) and produces a cellulose‐rich solid with increased digestibility by cellulolytic enzymes . The nature of hardwoods (i.e., beech, birch, poplar, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…The nature of hardwoods (i.e., beech, birch, poplar, etc.) and the relatively high content of acetyl units in their hemicellulose fractions makes them more susceptible to the hydrothermal pretreatment . On the other hand, the more recalcitrant nature of softwoods usually requires the addition of inorganic acids and/or previous physical‐mechanical (i.e., steam explosion, ball‐milling) pretreatment in order to enhance the enzymatic hydrolysis of cellulose, although hemicellulose could be effectively hydrolyzed and removed by using neat water …”

Section: Introductionmentioning

confidence: 99%

Enhancing Lignocellulosic Biomass Hydrolysis by Hydrothermal Pretreatment, Extraction of Surface Lignin, Wet Milling and Production of Cellulolytic Enzymes

et al. 2019

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Acetone and ethanol extraction of lignin deposits from the surface of hydrothermally (liquid hot water) pretreated beech wood biomass alleviates the lignin inhibitory effects during enzymatic hydrolysis of cellulose to glucose and boosts the enzymatic digestibility to high values (≈70 %). Characterization of the extracted lignins (FTIR, pyrolysis/GC–MS, differential thermogravimetry, gel permeation chromatography) indicated high purity, low molecular weight, and features that suggest that it consists mainly of fragments of the native wood lignin partially depolymerized and recondensed on the biomass surface during the hydrothermal pretreatment. The pyrolysis products of the extracted surface lignins suggest their high potential as a feedstock for the production of high added value phenolic compounds. When the enzymatic hydrolysis of the pretreated and extracted biomass solids was assisted by mild wet milling, near complete cellulose digestibility (≥95 %) could be achieved. In the context of the biorefinery and whole‐biomass valorization concept, it was also shown that the hydrothermally (hemicellulose‐deficient) pretreated and delignified biomass solids could be also successfully used for the production of crude cellulase from Trichoderma reesei cultures, providing a simple and low‐cost method for the complementary production of cellulases by utilizing fractions of the integrated hydrolysis process.

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“…Lignocellulosic biomass is nowadays considered to be an important renewable source for the production of fuels, energy, chemicals, polymers, and other products, with the (bio)catalytic processes playing a major role [1][2][3][4]. Lignocellulose comprises of two polysaccharides, cellulose (30-50 wt.%) and hemicellulose (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) wt.%), and an amorphous phenolic polymer, lignin (10-30 wt.%) [3,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Fast Pyrolysis of Lignin Isolated by Hybrid Organosolv—Steam Explosion Pretreatment of Hardwood and Softwood Biomass for the Production of Phenolics and Aromatics

et al. 2019

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Lignin, one of the three main structural biopolymers of lignocellulosic biomass, is the most abundant natural source of aromatics with a great valorization potential towards the production of fuels, chemicals, and polymers. Although kraft lignin and lignosulphonates, as byproducts of the pulp/paper industry, are available in vast amounts, other types of lignins, such as the organosolv or the hydrolysis lignin, are becoming increasingly important, as they are side-streams of new biorefinery processes aiming at the (bio)catalytic valorization of biomass sugars. Within this context, in this work, we studied the thermal (non-catalytic) and catalytic fast pyrolysis of softwood (spruce) and hardwood (birch) lignins, isolated by a hybrid organosolv–steam explosion biomass pretreatment method in order to investigate the effect of lignin origin/composition on product yields and lignin bio-oil composition. The catalysts studied were conventional microporous ZSM-5 (Zeolite Socony Mobil–5) zeolites and hierarchical ZSM-5 zeolites with intracrystal mesopores (i.e., 9 and 45 nm) or nano-sized ZSM-5 with a high external surface. All ZSM-5 zeolites were active in converting the initially produced via thermal pyrolysis alkoxy-phenols (i.e., of guaiacyl and syringyl/guaiacyl type for spruce and birch lignin, respectively) towards BTX (benzene, toluene, xylene) aromatics, alkyl-phenols and polycyclic aromatic hydrocarbons (PAHs, mainly naphthalenes), with the mesoporous ZSM-5 exhibiting higher dealkoxylation reactivity and being significantly more selective towards mono-aromatics compared to the conventional ZSM-5, for both spruce and birch lignin.

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Investigation of different pretreatment methods of Mediterranean-type ecosystem agricultural residues: characterisation of pretreatment products, high-solids enzymatic hydrolysis and bioethanol production

Abstract: View related articles View Crossmark data Citing articles: 11 View citing articles Investigation of different pretreatment methods of Mediterranean-type ecosystem agricultural residues: characterisation of pretreatment products, high-solids enzymatic hydrolysis and bioethanol production

Cited by 43 publications

References 48 publications

Biological Production of 3-Hydroxypropionic Acid: An Update on the Current Status

Biological Production of 3-Hydroxypropionic Acid: An Update on the Current Status

Enhancing Lignocellulosic Biomass Hydrolysis by Hydrothermal Pretreatment, Extraction of Surface Lignin, Wet Milling and Production of Cellulolytic Enzymes

Catalytic Fast Pyrolysis of Lignin Isolated by Hybrid Organosolv—Steam Explosion Pretreatment of Hardwood and Softwood Biomass for the Production of Phenolics and Aromatics

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