Hydrothermal and organosolv pretreatments of poplar wood and wheat straw for saccharification by a Trichoderma viride cellulase

Bonn, Guenther K.; Hörmeyer, H. F.; Bobleter, O.

doi:10.1007/bf00376197

Cited by 24 publications

(7 citation statements)

References 10 publications

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“…There is no strong dependence of the yield of glucose on the temperature applied in the organosolv fractionation process. This observation agrees with those of other studies on the enzymatic hydrolysis of organosolv‐treated poplar wood . Conversely, the enzymatic conversion of CUB pulps depends strongly on the temperature applied during the process (Figure a).…”

Section: Resultssupporting

confidence: 92%

Catalytic Upstream Biorefining through Hydrogen Transfer Reactions: Understanding the Process from the Pulp Perspective

2016

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Catalytic upstream biorefining (CUB) encompasses processes for plant biomass deconstruction through the early-stage conversion of lignin by the action of a hydrogenation catalyst. CUB processes produce lignin as an extensively depolymerised product (i.e., a viscous lignin oil) and render highly delignified pulps. In this report, we examine CUB from the pulp perspective. Notably, Raney Ni plays an indirect role in the processes that occur within the lignocellulose matrix. As there are negligible points of contact between the poplar wood chips and Raney Ni, the catalyst action is limited to the species leached from the matrix into the liquor. Nevertheless, the substantial changes in the liquor composition (through the decomposition of carboxylic acids and H-transfer reductive processes on the lignin fragments) have significant implications for the pulp composition, degree of polymerisation and morphology. Compared with organosolv pulps, CUB pulps show higher xylan retention, higher delignification, and higher polymerisation degree. Moreover, the correlation between these properties and the performance of the enzymatic hydrolyses of CUB and organosolv pulps reveals that the high susceptibility of CUB pulps is mostly caused by their lower residual lignin contents.

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Section: Resultssupporting

confidence: 92%

Catalytic Upstream Biorefining through Hydrogen Transfer Reactions: Understanding the Process from the Pulp Perspective

2016

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“…These include not only conventional, time-consuming, and laborious techniques such as reflux cooking (TE) but also more rapid and sophisticated ones, such as MAE , . Furthermore, Aquasolv extraction, a modified pressurized liquid extraction system, was considered for this evaluation . First experiments focused on the optimization of solvents by extracting the tea sample GT 48 India via MAE due to its high extraction efficiency in the shortest possible time.…”

Section: Resultsmentioning

confidence: 99%

Quality Assessment and Quantitative Analysis of Flavonoids from Tea Samples of Different Origins by HPLC-DAD-ESI-MS

Sultana

Stecher

Mayer

et al. 2008

J. Agric. Food Chem.

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Components of green tea ( Camellia sinensis) have been of considerable interest in recent years because of their potential utility as pharmaceutical agents, particularly for their antioxidant and anticarcinogenic activity. Responding to the increasing scientific validation of numerous health benefits of tea, a comprehensive approach was adopted to carry out analysis for the quality assessment of flavonoids in tea samples of different origins. For this purpose, extraction, separation, and mass spectrometric parameters were optimized. Extraction methods evaluated include reflux extraction, a modified accelerated solvent extraction (ASE), namely, Aquasolv extraction, and microwave-assisted extraction (MAE) using different percentages of solvents. Separation was performed by a specifically developed reversed phase high-performance liquid chromatography (RP-HPLC) method using different C18 and C8 stationary phases. Optimization of extraction techniques clearly proved the performance of MAE, which delivered highest yields in a very short time. Additionally, the comparison with Aquasolv extraction provided new insights, as variations in quantified amounts of target compounds between the extracts could be explained on the basis of thermal degradation and epimerization phenomena. Especially the epimerization phenomenon for catechin/epicatechin oligomers, that is, of procyanidins P 2 and P 3, was observed for the first time. Finally, an optimized extraction and separation system was used for qualitative and quantitative investigations of compounds from different green tea samples from Ceylon (cultivated under biologically controlled conditions), Japan, India, and China as well as from one black tea sample from India.

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“…However, because cellulosic components (i.e., substrates for ethanol production) are strongly covered with lignin in the lignocellulosic biomass, pretreatment (delignification) is necessary for efficient enzymatic saccharification followed by alcohol fermentation to increase the accessibility of cellulose to cellulases (Karp et al, 2013). Various pretreatment methods have been developed and applied to target the conversion of biomass to biofuel including: acid treatment (Torget et al, 1988), alkaline treatment (Ucar, 1990), ammonia fiber expansion (Dale et al, 1996), organosolv treatment (Bonn et al, 1987), liquid hot water treatment (Sreenath et al, 1999), microwave irradiation (Ooshima et al, 1984), superheated steam treatment (Bahrin et al, 2012), and steam explosion (Ramos et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Chemical characteristics and enzymatic saccharification of lignocellulosic biomass treated using high-temperature saturated steam: Comparison of softwood and hardwood

Asada

Sasaki

Hirano

et al. 2015

Bioresource Technology

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Hydrothermal and organosolv pretreatments of poplar wood and wheat straw for saccharification by a Trichoderma viride cellulase

Cited by 24 publications

References 10 publications

Catalytic Upstream Biorefining through Hydrogen Transfer Reactions: Understanding the Process from the Pulp Perspective

Catalytic Upstream Biorefining through Hydrogen Transfer Reactions: Understanding the Process from the Pulp Perspective

Quality Assessment and Quantitative Analysis of Flavonoids from Tea Samples of Different Origins by HPLC-DAD-ESI-MS

Chemical characteristics and enzymatic saccharification of lignocellulosic biomass treated using high-temperature saturated steam: Comparison of softwood and hardwood

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