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https://www.readbyqxmd.com/read/29151004/differentiation-of-wood-derived-vanillin-from-synthetic-vanillin-in-distillates-using-gc-c-irms-for-%C3%AE-13-c-analysis
#1
Katryna A van Leeuwen, Paul D Prenzler, Danielle Ryan, Mauro Paolini, Federica Camin
RATIONALE: Typical storage in oak barrels release in distillates different degradation products such as vanillin, which play an important role in their flavour and aroma. The addition of vanillin, as well as other aroma compounds, of different origin is prohibited by European laws. As vanillin samples from different sources have different δ(13) C values, the δ(13) C value could be used to determine whether the vanillin is authentic (lignin-derived), or if it has been added from another source (e...
November 18, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29149902/metabolism-of-aromatics-by-trichosporon-oleaginosus-while-remaining-oleaginous
#2
Allison Yaguchi, Alana Robinson, Erin Mihealsick, Mark Blenner
BACKGROUND: The oleaginous yeast, Trichosporon oleaginosus, has been extensively studied for its ability to metabolize non-conventional feedstocks. These include phenol-containing waste streams, such as distillery wastewater, or streams consisting of non-conventional sugars, such as hydrolyzed biomass and various bagasse. An initial BLAST search suggests this yeast has putative aromatic metabolizing genes. Given the desirability to valorize underutilized feedstocks such as lignin, we investigated the ability of T...
November 17, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/29149645/xylella-fastidiosa-induces-differential-expression-of-lignification-related-genes-and-lignin-accumulation-in-tolerant-olive-trees-cv-leccino
#3
Erika Sabella, Andrea Luvisi, Alessio Aprile, Carmine Negro, Marzia Vergine, Francesca Nicolì, Antonio Miceli, Luigi De Bellis
Recently, Xylella fastidiosa was reported in Italy, associated with the "Olive Quick Decline Syndrome". The cv. Leccino exhibits an evident tolerance with a slow disease progression compared with the other cultivars. Between the mechanisms proposed to explain the putative tolerance of some hosts to X. fastidiosa diseases, lignin deposition plays an important role. Analysis of phenolic compounds in healthy and infected Leccino and Cellina di Nardò leaves showed, in the two cultivars, a reduction of hydroxytyrosol glucoside (usually associated with drought and cold stress) and, only in Leccino, an increase of quinic acid, precursor of lignin...
November 10, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29149086/physiological-peculiarities-of-lignin-modifying-enzyme-production-by-the-white-rot-basidiomycete-coriolopsis-gallica-strain-bcc-142
#4
Vladimir Elisashvili, Eva Kachlishvili, Mikheil D Asatiani, Ramona Darlington, Katarzyna H Kucharzyk
Sixteen white-rot Basidiomycota isolates were screened for production of lignin-modifying enzymes (LME) in glycerol- and mandarin peel-containing media. In the synthetic medium, Cerrena unicolor strains were the only high laccase (Lac) (3.2-9.4 U/mL) and manganese peroxidase (MnP) (0.56-1.64 U/mL) producers while one isolate Coriolopsis gallica was the only lignin peroxidase (LiP) (0.07 U/mL) producer. Addition of mandarin peels to the synthetic medium promoted Lac production either due to an increase in fungal biomass (Funalia trogii, Trametes hirsuta, and T...
November 17, 2017: Microorganisms
https://www.readbyqxmd.com/read/29146838/retraction-for-hong-et-al-whole-genome-de-novo-sequencing-of-the-lignin-degrading-wood-rot-fungus-phanerochaete-chrysosporium-atcc-20696
#5
Chang-Young Hong, Su-Yeon Lee, Sun-Hwa Ryu, Sung-Suk Lee, Myungkil Kim
No abstract text is available yet for this article.
November 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/29145124/lignocellulosic-biomass-delignification-using-aqueous-alcohol-solutions-with-the-catalysis-of-acidic-ionic-liquids-a-comparison-study-of-solvents
#6
Fangchao Cheng, Xin Zhao, Yingcheng Hu
The exploration of effective deconstruction of biomass complex structures and mild fractionation into individual components is a profound challenge for the development of biorefinery. Herein, a biomass fractionation process, via treating biomass in various aqueous alcohol solutions with the catalysis of acidic ionic liquids 1-butyl-3-methylimidazolium hydrogen sulfate, was demonstrated to fractionate coir and poplar into cellulose materials with a lignin content as low as 0.95% and lignin with a delignification rate of up to 98%...
October 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29143790/deep-eutectic-solvents-dess-for-the-isolation-of-willow-lignin-salix-matsudana-cv-zhuliu
#7
Tengfei Li, Gaojin Lyu, Yu Liu, Rui Lou, Lucian A Lucia, Guihua Yang, Jiachuan Chen, Haroon A M Saeed
Deep eutectic solvents (DESs) are a potentially high-value lignin extraction methodology. DESs prepared from choline chloride (ChCl) and three hydrogen-bond donors (HBD)-lactic acid (Lac), glycerol, and urea-were evaluated for isolation of willow (Salix matsudana cv. Zhuliu) lignin. DESs types, mole ratio of ChCl to HBD, extraction temperature, and time on the fractionated DES-lignin yield demonstrated that the optimal DES-lignin yield (91.8 wt % based on the initial lignin in willow) with high purity of 94...
October 28, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29143788/thermal-degradation-kinetics-of-sugarcane-bagasse-and-soft-wood-cellulose
#8
Samson M Mohomane, Tshwafo E Motaung, Neerish Revaprasadu
The properties of untreated sugar cane bagasse (SCB) and soft wood (SW) and their respective celluloses were investigated. The celluloses indicated improved crystallinity index values and decreased concentration of lignin and hemicellulose compared to their untreated counterparts. Three degradation models, Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (OFW), and Kissinger (KGR) methods were employed to determine apparent activation energy values. Generally, the thermal degradation processes of both sugarcane bagasse and soft wood included dehydration, degradation of hemicellulose and cellulose, whereas the lignin degraded from the degradation temperature of hemicellulose to the end of the cellulose...
October 28, 2017: Materials
https://www.readbyqxmd.com/read/29143782/sustainable-bio-based-phenol-formaldehyde-resoles-using-hydrolytically-depolymerized-kraft-lignin
#9
Homaira Siddiqui, Nubla Mahmood, Zhongshun Yuan, Ferdinando Crapulli, Luana Dessbesell, Amin Rizkalla, Ajay Ray, Chunbao Charles Xu
In this study bio-based bio-phenol-formaldehyde (BPF) resoles were prepared using hydrolytically depolymerized Kraft lignin (DKL) as bio-phenol to partially substitute phenol. The effects of phenol substitution ratio, weight-average molecular weight (Mw) of DKL and formaldehyde-to-phenol (F/P) ratio were also investigated to find the optimum curing temperature for BPF resoles. The results indicated that DKL with Mw ~ 1200 g/mol provides a curing temperature of less than 180 °C for any substitution level, provided that F/P ratios are controlled...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29142789/catalytic-depolymerization-of-lignin-and-woody-biomass-in-supercritical-ethanol-influence-of-reaction-temperature-and-feedstock
#10
Xiaoming Huang, Ceylanpinar Atay, Jiadong Zhu, Sanne W L Palstra, Tamás I Korányi, Michael D Boot, Emiel J M Hensen
The one-step ethanolysis approach to upgrade lignin to monomeric aromatics using a CuMgAl mixed oxide catalyst is studied in detail. The influence of reaction temperature (200-420 °C) on the product distribution is investigated. At low temperature (200-250 °C), recondensation is dominant, while char-forming reactions become significant at high reaction temperature (>380 °C). At preferred intermediate temperatures (300-340 °C), char-forming reactions are effectively suppressed by alkylation and Guerbet and esterification reactions...
November 6, 2017: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29141952/characterization-and-analysis-of-ccr-and-cad-gene-families-at-the-whole-genome-level-for-lignin-synthesis-of-stone-cells-in-pear-pyrus-bretschneideri-fruit
#11
Xi Cheng, Manli Li, Dahui Li, Jinyun Zhang, Qing Jin, Lingling Sheng, Yongping Cai, Yi Lin
The content of stone cells has significant effects on the flavour and quality of pear fruit. Previous research suggested that lignin deposition is closely related to stone cell formation. In the lignin biosynthetic pathway, cinnamoyl-CoA reductase (CCR) and cinnamyl alcohol dehydrogenase (CAD), dehydrogenase/reductase family members, catalyse the last two steps in monolignol synthesis. However, there is little knowledge of the characteristics of the CCR and CAD families in pear and their involvement in lignin synthesis of stone cells...
November 15, 2017: Biology Open
https://www.readbyqxmd.com/read/29141617/comparison-of-hso4-cl-and-meco2-as-anions-in-pretreatment-of-aspen-and-spruce-with-imidazolium-based-ionic-liquids
#12
Zhao Wang, John Gräsvik, Leif J Jönsson, Sandra Winestrand
BACKGROUND: Ionic liquids (ILs) draw attention as green solvents for pretreatment of lignocellulose before enzymatic saccharification. Imidazolium-based ILs with different anionic constituents ([HSO4](-), [Cl](-), [MeCO2](-)) were compared with regard to pretreatment of wood from aspen and spruce. The objective was to elucidate how the choice of anionic constituent affected the suitability of using the IL for pretreatment of hardwood, such as aspen, and softwood, such as spruce. The investigation covered a thorough analysis of the mass balance of the IL pretreatments, the effects of pretreatment on the cell wall structure as assessed by fluorescence microscopy, and the effects of pretreatment on the susceptibility to enzymatic saccharification...
November 15, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/29140301/catalytic-oxidation-of-lignins-into-the-aromatic-aldehydes-general-process-trends-and-development-prospects
#13
REVIEW
Valery E Tarabanko, Nikolay Tarabanko
This review discusses principal patterns that govern the processes of lignins' catalytic oxidation into vanillin (3-methoxy-4-hydroxybenzaldehyde) and syringaldehyde (3,5-dimethoxy-4-hydroxybenzaldehyde). It examines the influence of lignin and oxidant nature, temperature, mass transfer, and of other factors on the yield of the aldehydes and the process selectivity. The review reveals that properly organized processes of catalytic oxidation of various lignins are only insignificantly (10-15%) inferior to oxidation by nitrobenzene in terms of yield and selectivity in vanillin and syringaldehyde...
November 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29140076/direct-analysis-of-lignin-phenols-in-freshwater-dissolved-organic-matter
#14
Hendrik Reuter, Julia Gensel, Marcus Elvert, Dominik Zak
A novel approach for the analysis of dissolved lignin in freshwaters is presented. Lignin concentrations in natural waters are low and a lignin extraction is usually required to obtain sufficient sample for analysis. In this method, extraction and dry down of the dissolved lignin are omitted and alkaline CuO oxidation is directly performed using 15 mL water sample in a microwave digestion system, thus reducing the required amount of sample and its preparation time considerably. Low procedural blank values are obtained by solid phase extraction (SPE) of the oxidized lignin phenols on HLB sorbents...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29136337/production-of-jet-fuel-range-hydrocarbons-from-hydrodeoxygenation-of-lignin-over-super-lewis-acid-combined-with-metal-catalysts
#15
Hongliang Wang, Huamin Wang, Eric Kuhn, Melvin P Tucker, Bin Yang
Super Lewis acids containing the triflate anion [e.g., Hf(OTf)4 , Ln(OTf)3 , In(OTf)3 , Al(OTf)3 ] and noble metal catalysts (e.g., Ru/C, Ru/Al2 O3 ) formed efficient catalytic systems to generate saturated hydrocarbons from lignin in high yields. In such catalytic systems, the metal triflates mediated rapid ether bond cleavage through selective bonding to etheric oxygens while the noble metal catalyzed subsequent hydrodeoxygenation (HDO) reactions. Near theoretical yields of hydrocarbons were produced from lignin model compounds by the combined catalysis of Hf(OTf)4 and ruthenium-based catalysts...
November 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29133091/synthesis-and-characterization-of-cotton-fiber-based-nanocellulose
#16
T Theivasanthi, F L Anne Christma, Adeleke Joshua Toyin, Subash C B Gopinath, Ramanibai Ravichandran
Nanocellulose prepared from the natural material has a promising wide range of opportunities to obtain the superior material properties towards various end-products. In this research, commercially available natural cotton was treated with aqueous sodium hydroxide solution to eliminate the hemicellulose and lignin, then cellulose was collected. The collected cellulose was subjected to acid hydrolysis using sulfuric acid to obtain nanocellulose. The prepared nanocellulose was further characterized with the aid of Fourier transform infrared spectroscopy, X-ray diffraction and Scanning Electron Microscopy to elucidate the chemical structure, crystallinity and the morphology...
November 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29132258/effect-of-three-pretreatment-techniques-on-the-chemical-composition-and-on-the-methane-yields-of-opuntia-ficus-indica-prickly-pear-biomass
#17
P S Calabrò, E Catalán, A Folino, A Sánchez, D Komilis
Opuntia ficus-indica (OFI) is an emerging biomass that has the potential to be used as substrate in anaerobic digestion. The goal of this work was to investigate the effect of three pretreatment techniques (thermal, alkaline, acidic) on the chemical composition and the methane yield of OFI biomass. A composite experimental design with three factors and two to three levels was implemented, and regression modelling was employed using a total of 10 biochemical methane potential (BMP) tests. The measured methane yields ranged from 289 to 604 NmL/gVSadded; according to the results, only the acidic pretreatment (HCl) was found to significantly increase methane generation...
November 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/29127854/comparative-modeling-and-molecular-docking-analysis-of-white-brown-and-soft-rot-fungal-laccases-using-lignin-model-compounds-for-understanding-the-structural-and-functional-properties-of-laccases
#18
Ayyappa Kumar Sista Kameshwar, Richard Barber, Wensheng Qin
Extrinsic catalytic properties of laccase enable it to oxidize a wide range of aromatic (phenolic and non-phenolic) compounds which makes it commercially an important enzyme. In this study, we have extensively compared and analyzed the physico-chemical, structural and functional properties of white, brown and soft rot fungal laccases using standard protein analysis software. We have computationally predicted the three-dimensional comparative models of these laccases and later performed the molecular docking studies using the lignin model compounds...
November 8, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29126467/rapid-fingerprinting-of-lignin-by-ambient-ionization-high-resolution-mass-spectrometry-and-simplified-data-mining
#19
Elizabeth A Crawford, Stefanie Gerbig, Bernhard Spengler, Dietrich A Volmer
Ambient ionization techniques are typically used to analyze samples in their native states with minimal or no sample pretreatment prior to mass spectrometric (MS) analysis. Desorption electrospray ionization (DESI) and direct analysis in real time (DART) were systematically investigated in this work for direct solid analysis of depolymerized lignin samples, with the goal of rapidly fingerprinting these samples, to efficiently characterize the subunits of this renewable energy source. High resolution MS was required for enhanced selectivity in this study due to the inherent structural complexity of lignin...
November 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29125750/contribution-of-quinones-and-ketones-aldehydes-to-the-optical-properties-of-humic-substances-hs-and-chromophoric-dissolved-organic-matter-cdom
#20
Rossana Del Vecchio, Tara Marie Schendorf, Neil V Blough
The molecular basis of the optical properties of chromophoric dissolved organic matter (CDOM) and humic substances (HS) remains poorly understood and yet to be investigated adequately. This study evaluates the relative contributions of two broad classes of carbonyl-containing compounds, ketones/aldehydes versus quinones, to the absorption and emission properties of a representative suite of HS as well as a lignin sample. Selective reduction of quinones to hydroquinones by addition of small molar excesses of dithionite to these samples under anoxic conditions produced small or negligible changes in their optical properties; however, when measurable, these changes were largely reversible upon exposure to air, consistent with the re-oxidation of hydroquinones to quinones...
November 10, 2017: Environmental Science & Technology
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