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0000-0001-5011-5752
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Publisher: Springer Science and Business Media LLC
Date: 17-10-2019
DOI: 10.1186/S13068-019-1588-3
Abstract: Lignocellulosic biomass is recognized as a promising renewable feedstock for the production of biofuels. However, current methods for converting biomass into fermentable sugars are considered too expensive and inefficient due to the recalcitrance of the secondary cell wall. Biomass composition can be modified to create varieties that are efficiently broken down to release cell wall sugars. This study focused on identifying the key biomass components influencing plant cell wall recalcitrance that can be targeted for selection in sugarcane, an important and abundant source of biomass. Biomass composition and the amount of glucan converted into glucose after saccharification were measured in leaf and culm tissues from seven sugarcane genotypes varying in fiber composition after no pretreatment and dilute acid, hydrothermal and ionic liquid pretreatments. In extractives-free sugarcane leaf and culm tissue, glucan, xylan, acid-insoluble lignin (AIL) and acid-soluble lignin (ASL) ranged from 20 to 32%, 15% to 21%, 14% to 20% and 2% to 4%, respectively. The ratio of syringyl (S) to guaiacyl (G) content in the lignin ranged from 1.5 to 2.2 in the culm and from 0.65 to 1.1 in the leaf. Hydrothermal and dilute acid pretreatments predominantly reduced xylan content, while the ionic liquid (IL) pretreatment targeted AIL reduction. The amount of glucan converted into glucose after 26 h of pre-saccharification was highest after IL pretreatment (42% in culm and 63.5% in leaf) compared to the other pretreatments. Additionally, glucan conversion in leaf tissues was approximately 1.5-fold of that in culm tissues. Percent glucan conversion varied between genotypes but there was no genotype that was superior to all others across the pretreatment groups. Path analysis revealed that S/G ratio, AIL and xylan had the strongest negative associations with percent glucan conversion, while ASL and glucan content had strong positive influences. To improve saccharification efficiency of lignocellulosic biomass, breeders should focus on reducing S/G ratio, xylan and AIL content and increasing ASL and glucan content. This will be key for the development of sugarcane varieties for bioenergy uses.
Publisher: Elsevier BV
Date: 12-2019
DOI: 10.1016/J.BIORTECH.2019.122214
Abstract: The use of bio-derived ionic liquids (e.g., cholinium lysinate) in a one-pot process was evaluated on overall sugar and lignin yields as a function of two model woody and herbaceous feedstocks, switchgrass and poplar, with emphasis on the study of physical and chemical alterations in lignin structure, by performing a detailed mass balance analysis and chemical characterization. Multiple chromatographic and spectroscopic analytical techniques were applied tracking lignin reactivity and partitioning during the ionic liquid one-pot conversion. Depolymerization efficiency of the lignin-rich residue derived from the whole process was investigated as a function of different temperatures and pressures during catalytic hydrogenolysis by Ni(SO)
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1GC03774A
Abstract: Wash-free one-pot ethanol conversion using Agave bagasse with a low-cost ionic liquid under optimized pretreatment conditions and high solids loading is demonstrated.
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.BIORTECH.2017.05.167
Abstract: A parametric study of the efficacy of the ionic liquid (IL) pretreatment (PT) of corn stover (CS) using 1-ethyl-3-methylimidazolium acetate ([C
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6GC02637K
Abstract: In the southeastern US, loblolly pine ( Pinus taeda L.) is widely used as a feedstock in the wood, pulp and paper industry.
Publisher: Elsevier BV
Date: 2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA04031B
Abstract: A pilot-scale continuous tubular reactor increases enzymatic digestibility of four different feedstocks by removing xylan and effectively achieving economically viable ethanol concentrations.
Publisher: American Chemical Society (ACS)
Date: 28-09-2018
Publisher: Elsevier BV
Date: 05-2015
DOI: 10.1016/J.BIORTECH.2015.01.121
Abstract: In this study the efficiency of mild ionic liquid (IL) pretreatment and pressurized hot water (PHW) is evaluated and compared in terms of bioethanol and biomethane yields, with corn stover (CS) and switchgrass (SG) as model bioenergy crops. Both feedstocks pretreated with the IL 1-ethyl-3-methylimidazolium acetate [C2C1Im][OAc] at 100°C for 3h exhibited lower glucose yield that those treated with harsher pretreatment conditions previously used. Compared to PHW, IL pretreatment demonstrated higher bioethanol yields moreover IL pretreatment enhanced biomethane production. Taking into consideration both bioethanol and biomethane productions, results indicated that when using IL pretreatment, the total energy produced per kg of total solids was higher compared to untreated biomasses. Specifically energy produced from CS and SG was +18.6% and +34.5% respectively, as compared to those obtained by hot water treatment, i.e. +2.3% and +23.4% for CS and SG, respectively.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8GC00518D
Abstract: A lignocellulose to bisabolene bioconversion process is demonstrated to be fully compatible with [Ch][Lys].
Publisher: American Chemical Society (ACS)
Date: 05-01-2018
Publisher: Frontiers Media SA
Date: 18-08-2057
Publisher: American Chemical Society (ACS)
Date: 25-11-0099
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9GC90091H
Abstract: Correction for ‘Sustainable bioproduction of the blue pigment indigoidine: Expanding the range of heterologous products in R. toruloides to include non-ribosomal peptides’ by Maren Wehrs et al. , Green Chem. , 2019, 21 , 3394–3406.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9GC00920E
Abstract: Development of R. toruloides as a production host for the sustainable production of the NRP indigoidine.
Publisher: Springer Science and Business Media LLC
Date: 12-2020
DOI: 10.1186/S13068-020-01837-2
Abstract: The composition of biomass determines its suitability for different applications within a biorefinery system. The proportion of the major biomass fractions (sugar, cellulose, hemicellulose and lignin) may vary in different sugarcane genotypes and growth environments and different parts of the plant. This study investigated the composition of mature and immature internodes, roots and mature leaves of sugarcane. Internodes were found to have a significantly larger alcohol-soluble component than leaves and roots. The primary difference between the immature and mature internodes was the ratio of soluble sugars. In mature tissues, sucrose content was significantly higher, whereas in immature internodal tissues there was lower sucrose and heightened concentrations of reducing sugars. Carbon (C) partitioning in leaf tissues was characterised by low levels of soluble components and high “other” and cell wall fractions. Root tissue had low ratios of soluble fractions relative to their cell wall contents, indicating a lack of storage of soluble carbon. There was no significant difference in the ratio of the major cell wall fractions between the major organ types. Characterisation of in idual non-cellulosic monomers indicated leaf and root tissues had significantly higher arabinose and galactose fractions. Significantly larger proportions of syringyl lignin compounds and the hydroxycinnamic compound, p- coumaric acid were observed in mature internodal tissues compared to the other tissue types. Tissue-specific differences in composition were shown to greatly affect the recalcitrance of the cell wall to enzymatic saccharification. Overall, this study displayed clear evidence of the differential partitioning of C throughout the sugarcane plant in specific organs. These organ-specific differences have major implications in their utility as a bioproduct feedstock. For ex le, the inclusion of trash (leaves) with the culms (internodes) may alter processing efficiency.
Publisher: Elsevier BV
Date: 08-2012
DOI: 10.1016/J.BIORTECH.2012.04.065
Abstract: There are several approaches being investigated to improve the efficiency of biomass conversion into fermentable sugars, including those that engineer the feedstocks to enhance digestibility. In this study it was evaluated the impact of genotype modifications of three mutants of Eucalyptus globulus L., and of the corresponding wild type on cellulose hydrolyzability before and after ionic liquid (IL) pretreatment. Both untreated and IL-treated s les were chemically characterized and tested for cellulose hydrolizability. Results obtained indicate that genetic modifications altered wood lignin-S/G ratio. This alteration resulted in a different hydrolyzability of cellulose for untreated s les, i.e. high lignin-S/G ratio produced low glucose yield (r=-0.97 P<0.03 n=4), but did not affect glucose yield after IL pretreatment. IL pretreated s les had increased glucose yields compared to that of untreated s les due to the modification of microcrystalline cellulose I to mixtures of more hydrolysable cellulose II and amorphous cellulose, and to the partial removal of the steric impediment, or removal of the lignin "sheath" protecting cellulose, to enzymes. The efficiency of the IL pretreatment used in this study does not appear to be affected by the S/G content of the E. globulus.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9GC00323A
Abstract: Bisabolene bioconversion is demonstrated using pilot-scale hydrothermal pretreated biomass using four feedstocks with in-depth characterization analysis.
Location: United States of America
Location: United States of America
No related grants have been discovered for Gabriella Papa.