keyword
MENU ▼
Read by QxMD icon Read
search

hmf

keyword
https://www.readbyqxmd.com/read/28629968/inhibitor-tolerance-of-a-recombinant-flocculating-industrial-saccharomyces-cerevisiae-strain-during-glucose-and-xylose-co-fermentation
#1
Yun-Cheng Li, Zi-Xi Gou, Ying Zhang, Zi-Yuan Xia, Yue-Qin Tang, Kenji Kida
Lignocellulose-derived inhibitors have negative effects on the ethanol fermentation capacity of Saccharomyces cerevisiae. In this study, the effects of eight typical inhibitors, including weak acids, furans, and phenols, on glucose and xylose co-fermentation of the recombinant xylose-fermenting flocculating industrial S. cerevisiae strain NAPX37 were evaluated by batch fermentation. Inhibition on glucose fermentation, not that on xylose fermentation, correlated with delayed cell growth. The weak acids and the phenols showed additive effects...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28628980/depolymerization-of-cellulose-into-high-value-chemicals-by-using-synergy-of-zinc-chloride-hydrate-and-sulfate-ion-promoted-titania-catalyst
#2
Weiqi Wei, Shubin Wu
Experiments for cellulose depolymerization by synergy of zinc chloride hydrate (ZnCl2·RH2O) and sulfated titania catalyst (SO4(2-)/TiO2) were investigated in this study. The results showed the introduction of sulfate into the TiO2 significantly enhanced the catalyst acid amount, especially for Brønsted acid site, which is beneficial for subsequent cellulose depolymerization. ZnCl2·RH2O hydrate, only a narrow composition range of water, specifically 3.0≤R≤4.0, can dissolve cellulose, which finally resulted the cellulose with low crystallinity and weak intrachain and interchain hydrogen bond network...
June 14, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28622483/human-milk-fortifiers-do-not-meet-the-current-recommendation-for-nutrients-in-very-low-birth-weight-infants
#3
Winston Koo, Hilary Tice
BACKGROUND: Use of multinutrient fortifiers is standard of care for small preterm infants fed exclusively human milk. However, adequacy of human milk fortifiers (HMFs) to meet the recommended intake for macronutrients and micronutrients is now known. MATERIALS AND METHODS: Nutrient content of human milk fortified according to manufacturer's recommendations was compared at isocaloric levels for 1 human milk-based (HMF-A), 2 bovine milk protein-based (HMF-B, HMF-C), and 2 preterm infant formulas (PTF-B, PTF-C)...
June 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28598609/a-novel-2d-nmr-approach-for-the-classification-of-balsamic-vinegars-of-modena
#4
Riccardo Graziosi, Davide Bertelli, Lucia Marchetti, Giulia Papotti, Maria Cecilia Rossi, Maria Plessi
The aim of this work is to evaluate the possibility of using 2D-NMR for the construction of classification models for balsamic vinegars of Modena. The goal was to obtain an indirect indicator of authenticity and a quality control tool. The spectral data were analysed by chemometric methods, aiming to discriminate the samples in relation to their origin. Application of general discriminant analysis (GDA) revealed a good discrimination, the two obtained models explained 83.9% and 97.3% of the total variance with a predictive capacity of 98...
June 9, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28598364/isoprenoids-production-from-lipid-extracted-microalgal-biomass-residues-using-engineered-e-coli
#5
Sumeng Wang, Jianming Yang
Microalgae are recognized as a third generation feedstock for biofuel production due to their rapid growth rates and lignin-free characteristics. In this study, a lipid extracted microalgal biomass residues was used as the raw material to produce isoprene, α-pinene and β-pinene with an engineered E. coli strain. We adopted an optimal sulfuric acid hydrolysis method (1:7 ratio of solid to acid solution, 32% (w/v) concentration of sulfuric acid solution at 90 °C for 90 min) to efficiently convert holocellulose into glucose efficiently (6...
June 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28554646/improvement-of-the-quality-of-parboiled-rice-by-using-anti-browning-agents-during-parboiling-process
#6
Franciene Almeida Villanova, Nathan Levien Vanier, Nathalia de Avila Madruga, Joseph Pesek, Maria Matyska-Pesek, Moacir Cardoso Elias, Maurício de Oliveira
Browning occurs in parboiled rice as a result of the Maillard reaction that negatively affects consumers' acceptability. The aim of this study was to evaluate the ability of gallic acid, glycine, reduced glutathione and l-cysteine at 0.1, 0.5, 1.0 and 2.0% levels to inhibit browning reactions during the parboiling of rice. Gallic acid and l-cysteine did not exhibit browning inhibition effect at the studied levels. On the other hand, glycine and the higher concentrations of reduced glutathione (1.0 and 2.0%) were able to promote a whiter color and a low free 5-hydroxymethyl-2-furaldehyde content (HMF)...
November 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28539730/near-infrared-spectroscopy-as-a-process-analytical-technology-tool-for-monitoring-the-parching-process-of-traditional-chinese-medicine-based-on-two-kinds-of-chemical-indicators
#7
Kaiyue Li, Weiying Wang, Yanping Liu, Su Jiang, Guo Huang, Liming Ye
BACKGROUND: The active ingredients and thus pharmacological efficacy of traditional Chinese medicine (TCM) at different degrees of parching process vary greatly. OBJECTIVE: Near-infrared spectroscopy (NIR) was used to develop a new method for rapid online analysis of TCM parching process, using two kinds of chemical indicators (5-(hydroxymethyl) furfural [5-HMF] content and 420 nm absorbance) as reference values which were obviously observed and changed in most TCM parching process...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28531852/two-step-sequential-pretreatment-for-the-enhanced-enzymatic-hydrolysis-of-coffee-spent-waste
#8
Rajeev Ravindran, Swarna Jaiswal, Nissreen Abu-Ghannam, Amit K Jaiswal
In the present study, eight different pretreatments of varying nature (physical, chemical and physico-chemical) followed by a sequential, combinatorial pretreatment strategy was applied to spent coffee waste to attain maximum sugar yield. Pretreated samples were analysed for total reducing sugar, individual sugars and generation of inhibitory compounds such as furfural and hydroxymethyl furfural (HMF) which can hinder microbial growth and enzyme activity. Native spent coffee waste was high in hemicellulose content...
September 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28505111/effects-of-mead-wort-heat-treatment-on-the-mead-fermentation-process-and-antioxidant-activity
#9
Sławomir Czabaj, Joanna Kawa-Rygielska, Alicja Z Kucharska, Jarosław Kliks
The effects of mead wort heat treatment on the mead fermentation process and antioxidant activity were tested. The experiment was conducted with the use of two different honeys (multiflorous and honeydew) collected from the Lower Silesia region (Poland). Heat treatment was performed with the use of a traditional technique (gently boiling), the more commonly used pasteurization, and without heat treatment (control). During the experiment fermentation dynamics were monitored using high performance liquid chromatography with refractive index detection (HPLC-RID)...
May 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28490123/kinetics-of-conversion-of-dihydroxyacetone-to-methylglyoxal-in-new-zealand-m%C3%A4-nuka-honey-part-iv-formation-of-hmf
#10
Megan N C Grainger, Adrian Owens, Merilyn Manley-Harris, Joseph R Lane, Richard J Field
During a study of the conversion of dihydroxyacetone (DHA) to methylglyoxal (MGO) in maturing New Zealand mānuka honey, the kinetics of formation of 5-(hydroxymethyl)furfural (HMF) was studied at temperatures from 4 to 37°C. Formation of HMF was first-order during an induction period and zero-order thereafter indicating that the mechanism includes the formation of certain critical intermediates and that these require time to build up; the duration of the induction period depended primarily upon temperature...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28490121/isotope-dilution-hplc-ms-ms-for-simultaneous-quantification-of-acrylamide-and-5-hydroxymethylfurfural-hmf-in-thermally-processed-seafood
#11
Lei Qin, Yu-Ying Zhang, Xian-Bing Xu, Xu-Song Wang, Hong-Wei Liu, Da-Yong Zhou, Bei-Wei Zhu, Megan Thornton
The objective of this study was to develop an accurate, robust and rapid HPLC-MS/MS-based method capable of quantifying acrylamide and 5-hydroxymethylfurfural (HMF) simultaneously. A Phenomenex Synergi Fusion-RP C18 column (50mm×2.5mm, 2μm) was used, and the MS/MS instrument was operated in multiple reaction monitoring mode. The isotope dilution method was used to correct for the matrix effect from samples. This method demonstrated low limits of quantification (2.12ng/mL for acrylamide and 4.86ng/mL for HMF) and excellent linearity (R(2)>0...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28488198/hydrogen-production-profiles-using-furans-in-microbial-electrolysis-cells
#12
Tunc Catal, Tansu Gover, Bugra Yaman, Jessica Droguetti, Kaan Yilancioglu
Microbial electrochemical cells including microbial fuel cells (MFCs) and microbial electrolysis cells (MECs) are novel biotechnological tools that can convert organic substances in wastewater or biomass into electricity or hydrogen. Electroactive microbial biofilms used in this technology have ability to transfer electrons from organic compounds to anodes. Evaluation of biofilm formation on anode is crucial for enhancing our understanding of hydrogen generation in terms of substrate utilization by microorganisms...
June 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28480150/biobased-furanics-kinetic-studies-on-the-acid-catalyzed-decomposition-of-2-hydroxyacetyl-furan-in-water-using-br%C3%A3-nsted-acid-catalysts
#13
J N M Soetedjo, H H van de Bovenkamp, P J Deuss, H J Heeres
Biobased furanics like 5-hydroxymethylfurfural (5-HMF) are interesting platform chemicals for the synthesis of biofuel additives and polymer precursors. 5-HMF is typically prepared from C6 ketoses like fructose, psicose, sorbose and tagatose. A known byproduct is 2-hydroxyacetylfuran (2-HAF), particularly when using sorbose and psicose as the reactants. We here report an experimental and kinetic modeling study on the rate of decomposition of 2-HAF in a typical reaction medium for 5-HMF synthesis (water, Brönsted acid), with the incentive to gain insights in the stability of 2-HAF...
May 1, 2017: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/28458081/reactivity-studies-in-water-on-the-acid-catalysed-dehydration-of-psicose-compared-to-other-ketohexoses-into-5-hydroxymethylfurfural
#14
Robert-Jan van Putten, Jan C van der Waal, Ed de Jong, Hero J Heeres
The conversion of the four possible ketohexoses (fructose, tagatose, sorbose and psicose) into 5-hydroxymethylfurfural (HMF) was explored in water using sulphuric acid as the catalyst (33 mM H2SO4, 120 °C). Significant differences in reactivity were observed and tagatose (48% conversion after 75 min) and psicose (35% conversion after 75 min) were clearly more reactive than fructose and sorbose (around 20% conversion after 75 min). The selectivity to HMF was found to be higher for fructose and psicose than for tagatose and sorbose...
April 13, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28458045/the-yeast-adh7-promoter-enables-gene-expression-under-pronounced-translation-repression-caused-by-the-combined-stress-of-vanillin-furfural-and-5-hydroxymethylfurfural
#15
Yoko Ishida, Trinh Thi My Nguyen, Shingo Izawa
Lignocellulosic biomass conversion inhibitors such as vanillin, furfural, and 5-hydroxymethylfurfural (HMF) inhibit the growth of and fermentation by Saccharomyces cerevisiae. A high concentration of each fermentation inhibitor represses translation and increases non-translated mRNAs. We previously reported that the mRNAs of ADH7 and BDH2, which encode putative NADPH- and NADH-dependent alcohol dehydrogenases, respectively, were efficiently translated even with translation repression in response to severe vanillin stress...
April 27, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28447293/shielding-of-the-geomagnetic-field-reduces-hydrogen-peroxide-production-in-human-neuroblastoma-cell-and-inhibits-the-activity-of-cuzn-superoxide-dismutase
#16
Hai-Tao Zhang, Zi-Jian Zhang, Wei-Chuan Mo, Ping-Dong Hu, Hai-Min Ding, Ying Liu, Qian Hua, Rong-Qiao He
Accumulative evidence has shown the adverse effects of a geomagnetic field shielded condition, so called a hypomagnetic field (HMF), on the metabolic processes and oxidative stress in animals and cells. However, the underlying mechanism remains unclear. In this study, we evaluate the role of HMF on the regulation of cellular reactive oxygen species (ROS) in human neuroblastoma SH-SY5Y cells. We found that HMF exposure led to ROS decrease, and that restoring the decrease by additional H2O2 rescued the HMF-enhanced cell proliferation...
April 26, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28434789/conversion-of-biomass-to-hydroxymethylfurfural-a-review-of-catalytic-systems-and-underlying-mechanisms
#17
REVIEW
Iris K M Yu, Daniel C W Tsang
Conversion of biomass waste to hydroxymethylfurfural (HMF), a value-added platform chemical, has captured great research interests driven by the economic and environmental incentives. This review evaluates the recent development of biomass conversion systems for high HMF yield and selectivity, with a focus on the performance of emerging catalysts and solvents from a mechanistic view. We highlight that the ratio and strength of Brønsted and Lewis acid in bifunctional catalyst are critical for maximizing HMF production by selective improvement in the kinetics of desirable reactions (hydrolysis, isomerization, and dehydration) over undesirable reactions (rehydration, polymerization)...
August 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28427638/a-new-approach-of-probe-sonication-assisted-ionic-liquid-conversion-of-glucose-cellulose-and-biomass-into-5-hydroxymethylfurfural
#18
Ariyanti Sarwono, Zakaria Man, Nawshad Muhammad, Amir Sada Khan, Wan Suzaini Wan Hamzah, Asyraf Hanim Abdul Rahim, Zahoor Ullah, Cecilia Devi Wilfred
5-Hydroxymethylfurfural (HMF) has been identified as a promising biomass-derived platform chemical. In this study, one pot production of HMF was studied in ionic liquid (IL) under probe sonication technique. Compared with the conventional heating technique, the use of probe ultrasonic irradiation reduced the reaction time from hours to minutes. Glucose, cellulose and local bamboo, treated with ultrasonic, produced HMF in the yields of 43%, 31% and 13% respectively, within less than 10min. The influence of various parameters such as acoustic power, reaction time, catalysts and glucose loading were studied...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28425225/green-processing-of-lignocellulosic-biomass-and-its-derivatives-in-deep-eutectic-solvents
#19
REVIEW
Xing Tang, Miao Zuo, Zheng Li, Huai Liu, Caixia Xiong, Xianhai Zeng, Yong Sun, Lei Hu, Shijie Liu, Tingzhou Lei, Lu Lin
The scientific community has been seeking cost-competitive and green solvents with good dissolving capacity for the valorization of lignocellulosic biomass. At this point, deep eutectic solvents (DESs) are currently emerging as a new class of promising solvents that are generally liquid eutectic mixtures formed by self-association (or hydrogen-bonding interaction) of two or three components. DESs are attractive solvents for the fractionation (or pretreatment) of lignocellulose and the valorization of lignin, owing to the high solubility of lignin in DESs...
April 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28407894/acrylamide-and-5-hydroxymethylfurfural-formation-during-biscuit-baking-part-ii-effect-of-the-ratio-of-reducing-sugars-and-asparagine
#20
Ha T Nguyen, H J Ine van der Fels-Klerx, M A J S van Boekel
This study investigated acrylamide and 5-hydroxymethylfurfural (HMF) formation during biscuit baking. Four types of wheat flour with different molar ratios of total fructose and glucose to asparagine were investigated. Nevertheless, the molar ratio in all four biscuit doughs exceeded one after proofing due to enzyme action. Data obtained after baking were used to develop a mechanistic model, based on the asparagine-related pathway, for acrylamide and HMF formation in the four baked biscuit types. Asparagine reacted with fructose to form a Schiff base before decarboxylation to produce acrylamide without Amadori rearrangement product and sugar fragmentation...
September 1, 2017: Food Chemistry
keyword
keyword
106130
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"