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https://www.readbyqxmd.com/read/28434789/conversion-of-biomass-to-hydroxymethylfurfural-a-review-of-catalytic-systems-and-underlying-mechanisms
#1
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
#2
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
#3
Xing Tang, Miao Zuo, Zheng Li, Huai Liu, Caixia Xiong, Xianhai Zeng, Yong Sun, Lei Hu, Tingzhou Lei, Shijie Liu, 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, which 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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/28322944/new-insights-into-non-enzymatic-glycation-of-human-serum-albumin-biopolymer-a-study-to-unveil-its-impaired-structure-and-function
#11
Alok Raghav, Jamal Ahmad, Khursheed Alam, Asad U Khan
Albumin glycation and subsequent formation of advanced glycation end products (AGEs) correlate with diabetes and associated complications. Human Serum Albumin (HSA) was modified with d-glucose for a 40day period under sterile conditions at 37°C. Modified samples along with native HSA (unmodified) were analyzed for impairment in biochemical characteristics ((fructosamine, carbonyl, thiol, lysine, arginine, hydroxymethyl furfural [HMF] content), electrochemical (electrical conductance), simulated gastric fluid assay, simulated intestinal fluid assay, spectroscopic properties (UV, fluorescence), optical (surface contact angle) and fluid dynamics (viscosity and Stokes radius)...
March 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28317713/a-validated-fast-difference-spectrophotometric-method-for-5-hydroxymethyl-2-furfural-hmf-determination-in-corn-syrups
#12
Jucimara Kulek de Andrade, Camila Kulek de Andrade, Emy Komatsu, Hélène Perreault, Yohandra Reyes Torres, Marcos Roberto da Rosa, Maria Lurdes Felsner
Corn syrups, important ingredients used in food and beverage industries, often contain high levels of 5-hydroxymethyl-2-furfural (HMF), a toxic contaminant. In this work, an in house validation of a difference spectrophotometric method for HMF analysis in corn syrups was developed using sophisticated statistical tools by the first time. The methodology showed excellent analytical performance with good selectivity, linearity (R(2)=99.9%, r>0.99), accuracy and low limits (LOD=0.10mgL(-1) and LOQ=0.34mgL(-1))...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28317245/efficient-discovery-of-quality-control-markers-for-gastrodia-elata-tuber-by-fingerprint-efficacy-relationship-modelling
#13
Mingfang Li, Yuan Du, Long Wang, Lilong Jiang, Xiaodong Ma, Ping Zhou, Ping Li, Huijun Li
INTRODUCTION: Gastrodia elata tuber (GET) has been widely used in China as a famous herbal medicine. However, the quality control markers (QCMs) for GET still need further investigation. OBJECTIVE: To develop a rational strategy based on fingerprint-efficacy relationship modelling to discover the efficacy-related QCMs, using GET as a case study. METHODOLOGY: The high-performance liquid chromatography (HPLC) fingerprints of 13 batches of GET extracts were established and 10 common peaks were structurally characterised by HPLC coupled with quadrupole time-of-flight mass spectrometry (QTOF-MS)...
March 20, 2017: Phytochemical Analysis: PCA
https://www.readbyqxmd.com/read/28272798/acidic-zeolite%C3%A2-l-as-a-highly-efficient-catalyst-for-dehydration-of-fructose-to-5-hydroxymethylfurfural-in-ionic-liquid
#14
Zhongsen Ma, Hualei Hu, Zhongqiang Sun, Wenting Fang, Jian Zhang, Longfei Yang, Yajie Zhang, Lei Wang
Zeolite L was synthesized by the hydrothermal method and post-treated by NH4 exchange to adjust its acidity. The samples were systematic characterized by various techniques including XRD, X-ray fluorescence spectroscopy, N2 adsorption-desorption, scanning electron microscopy, pyridine IR spectroscopy, and NH3 temperature-programmed desorption. The results demonstrated that the NH4 -exchange post-treatment increased the surface area, micropore volume, and acidity of zeolite L. The catalytic performance of the samples was tested in the dehydration of fructose to 5-hydroxymethylfurfural (HMF) in ionic liquid (1-butyl-3-methylimidazolium bromide, [bmim]Br)...
April 22, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28260667/microbial-biodiesel-production-from-oil-palm-biomass-hydrolysate-using-marine-rhodococcus-sp-yhy01
#15
Shashi Kant Bhatia, Junyoung Kim, Hun-Seok Song, Hyun Joong Kim, Jong-Min Jeon, Ganesan Sathiyanarayanan, Jeong-Jun Yoon, Kyungmoon Park, Yun-Gon Kim, Yung-Hun Yang
The effect of various biomass derived inhibitors (i.e. furfural, hydroxymethylfurfural (HMF), vanillin, 4-hydroxy benzaldehyde (4-HB) and acetate) was investigated for fatty acid accumulation in Rhodococcus sp. YHY 01. Rhodococcus sp. YHY01 was able to utilize acetate, vanillin, and 4-HB for biomass production and fatty acid accumulation. The IC50 value for furfural (3.1mM), HMF (3.2mM), vanillin (2.0mM), 4-HB (2.7mM) and acetate (3.7mM) was calculated. HMF and vanillin affect fatty acid composition and increase saturated fatty acid content...
February 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28254674/hydrothermal-conversion-of-n-acetyl-d-glucosamine-to-5-hydroxymethylfurfural-using-ionic-liquid-as-a-recycled-catalyst-in-a-water-dimethyl-sulfoxide-mixture
#16
Hongjun Zang, Songbai Yu, Pengfei Yu, Hongying Ding, Yannan Du, Yuchan Yang, Yiwen Zhang
Here, N-acetyl-d-glucosamine (GlcNAc), the monomer composing the second most abundant biopolymer, chitin, was efficiently converted into 5-hydroxymethylfurfural (5-HMF) using ionic liquid (IL) catalysts in a water/dimethyl sulfoxide (DMSO) mixture solvent. Various reaction parameters, including reaction temperature and time, DMSO/water mass ratios and catalyst dosage were optimized. A series of ILs with different structures were analyzed to explore their impact on GlcNAc conversion. The substrate scope was expanded from GlcNAc to d-glucosamine, chitin, chitosan and monosaccharides, although 5-HMF yields obtained from polymers and other monosaccharides were generally lower than those from GlcNAc...
April 10, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28245567/permeation-of-polymethoxyflavones-into-the-mouse-brain-and-their-effect-on-mk-801-induced-locomotive-hyperactivity
#17
Satoshi Okuyama, Kohei Miyazaki, Rie Yamada, Yoshiaki Amakura, Morio Yoshimura, Atsushi Sawamoto, Mitsunari Nakajima, Yoshiko Furukawa
Accumulating data have indicated that citrus polymethoxyflavones (PMFs) have the ability to affect brain function. In the present study, we showed that 3,5,6,7,8,3',4'-heptamethoxy- flavone (HMF) given intraperitoneally to mice was immediately detected in the brain and that the permeability of the brain tissues to it was significantly higher than that of other citrus PMFs (nobiletin, tangeretin, and natsudaidain). The permeation of these PMFs into the brain well correlated with their abilities to suppress MK-801-induced locomotive hyperactivity, suggesting that HMF had the ability to act directly in the brain...
February 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28242956/simultaneous-inhibition-of-acrylamide-and-hydroxymethylfurfural-formation-by-sodium-glutamate-microcapsules-in-an-asparagine-glucose-model-system
#18
Zimeng Wang, Chao Wen, Xingbo Shi, Dai Lu, Jiehong Deng, Fangming Deng
Inhibiting the formation of acrylamide (AA) and hydroxymethylfurfural (HMF) during food heating processes has attracted considerable investigative efforts due to potential health concerns associated with these compounds. The main purpose of this work is to demonstrate a strategy to simultaneously inhibit the formation of AA and HMF with sodium glutamate microcapsules selected to confirm the efficacy of this strategy. An asparagine-glucose aqueous model system was prepared containing free sodium glutamate and sodium glutamate microcapsules...
February 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28231180/evolution-of-the-maillard-reaction-in-glutamine-or-arginine-dextrinomaltose-model-systems
#19
Silvia Pastoriza, José Ángel Rufián-Henares, Belén García-Villanova, Eduardo Guerra-Hernández
Enteral formulas are foods designed for medical uses to feed patients who are unable to eat normally. They are prepared by mixing proteins, amino acids, carbohydrates and fats and submitted to sterilization. During thermal treatment, the Maillard reaction takes place through the reaction of animo acids with reducing sugars. Thus, although glutamine and arginine are usually added to improve the nutritional value of enteral formulas, their final concentration may vary. Thus, in the present paper the early, intermediate, and advanced states of the Maillard reaction were studied in model systems by measuring loss of free amino acids through the decrease of fluorescence intensity with o-phtaldialdehyde (OPA), 5-Hydroximethylfurfural (HMF), furfural, glucosylisomaltol, fluorescence, and absorbance at 420 nm...
December 7, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231083/evaluation-of-the-availability-and-antioxidant-capacity-of-maillard-compounds-present-in-bread-crust-studies-in-caco-2-cells
#20
Silvia Pastoriza de la Cueva, Isabel Seiquer, Marta Mesías, José Ángel Rufián-Henares, Cristina Delgado-Andrade
Bread crust is one of the major contributors to the intake of Maillard reaction products (MRP). MRP improve the organoleptic properties of foods and can provide biological actions such as antioxidant properties. The transport and availability of Amadori compounds (measured as furosine) and hydroxymethylfurfural (HMF)-early and intermediary MRP-from enzymatically digested bread crust (BC) and from its soluble low-molecular weight (LMW) and high-molecular weight (HMW) fractions were investigated in the Caco-2 cell line...
January 11, 2017: Foods (Basel, Switzerland)
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