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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
#1
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
#2
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...
May 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28505111/effects-of-mead-wort-heat-treatment-on-the-mead-fermentation-process-and-antioxidant-activity
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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)...
April 9, 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
#12
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
#13
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
#14
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
https://www.readbyqxmd.com/read/28400643/hypopigmented-mycosis-fungoides-clinical-histological-and-immunohistochemical-remission-induced-by-narrow-band-ultraviolet-b
#15
Kavita Bisherwal, Archana Singal, Deepika Pandhi, Sonal Sharma
Mycosis fungoides (MF) is the most common type of primary cutaneous lymphomas. Several clinical variants of MF have been described. Purely, hypopigmented variant of MF (HMF) is rare. Phototherapy, especially photochemotherapy (Psoralen and ultraviolet), is the most widely used method and is recommended as the first-line treatment for HMF. However, there are no standard guidelines for phototherapy as the disease is uncommon. We, hereby, report a 30-year-old woman with HMF in whom clinical, histopathological, and immunohistochemical remission was achieved following narrow-band ultraviolet B therapy...
March 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28395827/inhibitory-mechanism-of-quercetin-against-the-formation-of-5-hydroxymethyl-2-furaldehyde-in-buckwheat-flour-bread-by-ultra-performance-liquid-chromatography-coupled-with-high-resolution-tandem-mass-spectrometry
#16
Yinan Zhang, Xiaoning An
Ultra-performance liquid chromatography coupled with high-resolution tandem mass spectrometry (UPLC-HRMS/MS) was employed to investigate the inhibitory mechanism of quercetin against the formation of 5-(hydroxymethyl)-2-furaldehyde (HMF) in buckwheat flour bread. The HMF and HMF precursors (3,4-dideoxyglucosone-3-ene (3,4-DGE), 3-deoxyglucosone (3-DG), or fructofuranosyl cation dehydration products (FCDPs)) adducts of quercetin were detected in buckwheat flour bread, with the trapping of these compounds by quercetin to form corresponding adducts with HMF or its precursors in 1:1, 1:2, 1:3, and 1:4 ratios (where "1" refers to quercetin in all cases)...
May 2017: Food Research International
https://www.readbyqxmd.com/read/28389771/qtl-mapping-for-haploid-male-fertility-by-a-segregation-distortion-method-and-fine-mapping-of-a-key-qtl-qhmf4-in-maize
#17
Jiaojiao Ren, Penghao Wu, Xiaolong Tian, Thomas Lübberstedt, Shaojiang Chen
Four QTL related to haploid male fertility were detected by a segregation distortion method and the key QTL qhmf4 was fine mapped to an interval of ~800 kb. Doubled haploid (DH) technology enables rapid development of homozygous lines in maize breeding programs. However, haploid genome doubling is a bottleneck for the commercialization of DH technology and is limited by haploid male fertility (HMF). This is the first study reporting the quantitative trait locus (QTL) analysis of HMF in maize. Four QTL, qhmf1, qhmf2, qhmf3, and qhmf4, controlling HMF have been identified by segregation distortion (SD) loci detection in the selected haploid population derived from 'Yu87-1/Zheng58'...
April 7, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28383581/an-ultrasonic-atomization-assisted-synthesis-of-self-assembled-manganese-oxide-octahedral-molecular-sieve-nanostructures-and-their-application-in-catalysis-and-water-treatment
#18
Aparna Iyer, Chung-Hao Kuo, Saminda Dharmarathna, Zhu Luo, Dinithi Rathnayake, Junkai He, Steven L Suib
Manganese oxides of octahedral molecular sieve (OMS-2) type have important applications in oxidation catalysis, adsorption, and as battery materials. The synthesis methods employed determine their morphology and textural properties which markedly affect their catalytic activity. In this work, a room temperature ultrasonic atomization assisted synthesis of OMS-2 type materials is demonstrated. This synthesis differs from previously reported methods in that it is a simple, no-heat application that leads to a striking morphological characteristic of uniformly sized OMS-2 fibers and their self-assembly into dense as well as hollow spheres...
April 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28372195/hmf-and-diastase-activity-in-honeys-a-fully-validated-approach-and-a-chemometric-analysis-for-identification-of-honey-freshness-and-adulteration
#19
Ioannis N Pasias, Ioannis K Kiriakou, Charalampos Proestos
A fully validated approach for the determination of diastase activity and hydroxymethylfurfural content in honeys were presented in accordance with the official methods. Methods were performed in real honey sample analysis and due to the vast number of collected data sets reliable conclusions about the correlation between the composition and the quality criteria were exported. The limits of detection and quantification were calculated. Accuracy, precision and uncertainty were estimated for the first time in the kinetic and spectrometric techniques using the certified reference material and the determined values were in good accordance with the certified values...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28367924/5-hmf-attenuates-liver-fibrosis-in-ccl4-plus-alcohol-induced-mice-by-suppression-of-oxidative-stress
#20
Xin-Yue Han, Jun-Nan Hu, Zi Wang, Sheng-Nan Wei, Si-Wen Zheng, Ying-Ping Wang, Wei Li
The aim of this study was to investigate the effects of 5-hydroxymethyl-2-furfural (5-HMF) on liver fibrosis induced by carbon tetrachloride (CCl4) and alcohol. Male ICR mice were treated with CCl4 dissolved in olive oil (10% v/v, 2.5 μg/L) intraperitoneally (i.p.), and given at a dose of 2.5×10(-5) mg/kg B.W. twice a week for 7 wk. Concurrently, mice received drinking water with or without alcohol. The mice in treatment groups and positive control group were gavaged with 5-HMF (7.5, 15, and 30 mg/kg B.W...
2017: Journal of Nutritional Science and Vitaminology
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