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Ke-Feng Wang, Chun-Lei Liu, Kun-Yan Sui, Chen Guo, Chun-Zhao Liu
2,5-Furandicarboxylic acid (FDCA) is a biobased platform chemical for the production of polyesters. The magnetic laccase catalyst with TEMPO as the mediator has the remarkable capability of oxidizing HMF to 2,5-furandicarboxylic acid (FDCA). Under optimal reaction conditions, a quantitative yield (90.2%) of FDCA with complete HMF conversion was obtained after 96 h of reaction. More importantly, the magnetic laccase catalyst exhibited good recyclability and stability, maintaining 84.8% of its original activity following 6 reuse cycles...
January 15, 2018: Chembiochem: a European Journal of Chemical Biology
Gustavo M Amorim, Joao P Niemeyer-Corbellini, Danielle C Quintella, Tullia Cuzzi, Marcia Ramos-E-Silva
BACKGROUND: Hypopigmented mycosis fungoides (hMF) is a rare subtype of mycosis fungoides. The aim of this study was to identify the clinical-epidemiological profile of our patient group and also to provide additional information about treatment responses and prognosis. METHODS: This is a cross-sectional retrospective observational study, with exploratory analysis. The outcome variables were disease progression and related death. RESULTS: Twenty patients with hMF were selected from a group of 102 patients diagnosed with MF...
January 10, 2018: International Journal of Dermatology
Carlos A S Lanziano, Silvia F Moya, Dean H Barrett, Reginaldo Guirardello, Felipe de Souto da Silva, Roberto Rinaldi, Cristiane Barbieri Rodella
Herein, we report a synthetic route for the preparation of hybrid-organic-inorganic anatase (hybrid-TiO2) via a facile hydrothermal synthesis method employing citric acid. The synthetic approach results in a high surface area nanocrystalline anatase polymorph of TiO2. The uncalcined hybrid-TiO2 is directly studied here as the catalyst for the conversion of glucose into HMF. In the presence of the hybrid-TiO2, HMF yields up to 45% at glucose conversions up to 75% were achieved in water at 130 oC in a monophasic batch reactor...
January 8, 2018: ChemSusChem
Alexander Karich, Sebastian B Kleeberg, René Ullrich, Martin Hofrichter
Enzymatic oxidation of 5-hydroxymethylfurfural (HMF) and its oxidized derivatives was studied using three fungal enzymes: wild-type aryl alcohol oxidase (AAO) from three fungal species, wild-type peroxygenase from Agrocybe aegerita (AaeUPO), and recombinant galactose oxidase (GAO). The effect of pH on different reaction steps was evaluated and apparent kinetic data (Michaelis-Menten constants, turnover numbers, specific constants) were calculated for different enzyme-substrate ratios and enzyme combinations...
January 9, 2018: Microorganisms
Leichang Cao, Iris K M Yu, Season S Chen, Daniel C W Tsang, Lei Wang, Xinni Xiong, Shicheng Zhang, Yong Sik Ok, Eilhann E Kwon, Hocheol Song, Chi Sun Poon
Sulfonated biochar derived from forestry wood waste was employed for the catalytic conversion of starch-rich food waste (e.g., bread) into 5-hydroxymethylfurfural (HMF). Chemical and physical properties of catalyst were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area, and elemental analysis. The conversion of HMF was investigated via controlling the reaction parameters such as catalyst loading, temperature, and reaction time...
December 29, 2017: Bioresource Technology
Zehui Zhang, George W Huber
A wide variety of commodity chemicals can be produced from the catalytic oxidation of carbohydrates or carbohydrate derived molecules including formic acid, acetic acid, glycolic acid, gluconic acid, glucaric acid, malonic acid, oxalic acid, 2,5-diformylfuran (DFF), 5-hydroxymethyl-2-furancarboxylic acid (HFCA), 5-formyl-2-furancarboxylic acid (FFCA), and 2,5-furandicarboxylic acid (FDCA). This review will highlight the recent research progress in the development of new routes for the production of organic acids and furan compounds via catalytic oxidation reactions...
January 3, 2018: Chemical Society Reviews
Shabnam Lainwala, Natalia Kosyakova, Ann Marie Spizzoucco, Victor Herson, Elizabeth A Brownell
BACKGROUND: In preterm infants fortification of human milk with human milk fortifiers (HMF) to optimize nutrition and growth is standard practice. We compared clinical, nutrition and growth outcomes in infants receiving two types of liquid HMF (LHMF). METHODS: Clinical, nutrition and growth outcomes were compared between infants admitted to a level IV NICU, and born with birth weight less than or equal to 1800 grams, between 10/1/2014-12/31/2014 and received human milk with acidified LHMF (ALHMF) and between 1/1/2015-4/31/2015 and received human milk with heat treated LHMF (HTLHMF)...
2017: Journal of Neonatal-perinatal Medicine
Avtar Singh Matharu, Suleiman Ahmed, Badriya Al-Monthery, Duncan Macquarrie, Yoon-Sik Lee, Yohan Kim
: Iron-nitrogen heterocyclic carbenes (Fe-NHCs) have come to the fore because of their ability to be employed in diverse catalytic applications ranging from C-C cross-coupling and C-X bond formation to substitution, reduction, polymerization, and dehydration. The detailed synthesis, characterisation and application of novel heterogeneous Fe-NHC catalysts immobilised on mesoporous expanded starch and Starbon™ 350 for facile fructose to HMF conversion is reported. Both catalyst types showed good performance for the dehydration of fructose to HMF when the reaction was explored at 100 ◦C and varying time (10 min, 20 min, 0...
December 27, 2017: ChemSusChem
Vinod Kumar, Meena Krishania, Pankaj Preet Sandhu, Vivek Ahluwalia, Edgard Gnansounou, Rajender S Sangwan
The present study demonstrates utilization of secondary agricultural wastes for xylitol production. The highest xylan-to-xylose (70%) conversion was achieved using dilute nitric acid as catalyst followed by resin treatment. Results show that resin treatment efficiently removed nitrate salt (70%), phenolic content and 5-HMF (70%). Highest xylitol yield (85%) was achieved during fermentation using Candida tropicalis MTCC 6192 from the neutralized hemicellulosic hydrolysate medium. Good recovery (>15%) was achieved from corncob with 85% xylose to xylitol conversion during fermentation...
December 8, 2017: Bioresource Technology
Geerada Kaewjumpol, Maria J Oruna-Concha, Keshavan Niranjan, Supawan Thawornchinsombut
BACKGROUND: This research employed mild-subcritical alkaline water extraction (SAW) technique to overcome the difficulty of active compounds extractability from an industrially defatted rice bran (IDRB). Mild-SAW (pH 9.5, 130 °C, 120 min) treatment, followed by enzymatic hydrolysis (Protease G6) were applied to produce rice bran hydrolysate (RBH). Response surface methodology was used to identify proteolysis conditions for maximizing protein content and ABTS radical scavenging activity (ABTS-RSA)...
December 14, 2017: Journal of the Science of Food and Agriculture
Bartosz Wozniak, Anke Spannenberg, Yuehui Li, Sandra Hinze, Johannes Gerardus de Vries
An efficient strategy for the conversion of biomass derived 5-hydroxymethyl-furfural (HMF) to 2-hydroxy-3-methylcyclopent-2-enone (MCP) via intramolecular aldol condensation of 1-hydroxyhexane-2,5-dione (HHD) has been developed. Further transformations of MCP towards the diol, enol acetate, levulinic acid and N-heterocyclic compounds are also reported.
December 13, 2017: ChemSusChem
Konstantin I Galkin, Fedor A Kucherov, Oleg N Markov, Ksenia S Egorova, Alexandra V Posvyatenko, Valentine P Ananikov
Reductive amination of 2,5-diformylfuran (DFF) was used to implement the transition from bio-derived 5-hydroxymethylfurfural (HMF) to pharmaceuticals. The synthesized bis(aminomethyl)furans were utilized as building blocks for the construction of new derivatives with structural cores of naturally occurring biologically active compounds. Using the one-pot procedure, which included the Diels-Alder reaction followed by hydrogenation of the double bond, bio-derived analogues of the anticancer drug norcantharidin were obtained...
December 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Fáver Gómez-Narváez, Yaqueline Medina-Pineda, José Contreras-Calderón
Maillard reaction (MR) was assessed in 10 powdered whey samples. Initial stages of MR were evaluated using furosine, intermediate stages with hydroxymethylfurfural (HMF) and absorbance at 284nm, advanced stages with color parameters (CIELab color) and final stages with browning index; additionally, insolubility, pH and water activity (Aw) were measured. Principal component analysis (PCA) and cluster analysis (CA) were used to establish the heat damage of samples based on relations between variables. Three principal components were found which explained 79...
December 2017: Food Research International
Tao Cao, Mengjia Wu, Vitaly V Ordomsky, Xi Xin, Hao Wang, Pascal Metivier, Marc Pera-Titus
2,5-furandialdehyde (DFF) was synthesized by electrogenerative oxidation of 5-hydroxymethylfurfural (HMF) over a PtRu catalyst with 89% selectivity at 50 oC after 17 h. This approach opens an avenue for a selective, energy-efficient and green oxidation of biomass-derived platform alcohols to added-value chemicals.
December 1, 2017: ChemSusChem
Chu-Fang Yang, Ci-Ruei Huang
In dealing with lignocellulosic and algal biomass, thermal acid hydrolysis is an economical and efficient method. In this process, 5-hydroxy-methylfurfural (5-HMF) is formed unavoidably, which inhibits downstream reducing sugar fermentation. Fortunately, 5-HMF can be biotransformed into 2,5-furan-dicarboxylic acid (FDCA), the top 14 biomass platform molecules. Base on the connection between 5-HMF removal and FDCA production, microbes capable of biotransforming 5-HMF into FDCA are beneficial to raise biofuel yield and potential molecule production...
November 25, 2017: Journal of Bioscience and Bioengineering
Karolin Dietrich, Marie-Josée Dumont, Timothy Schwinghamer, Valérie Orsat, Luis F Del Rio
Softwood hemicellulose hydrolysates are a cheap source of sugars that can be used as a feedstock to produce polyhydroxybutyrates (PHB), which are biobased and compostable bacterial polyesters. To assess the potential of the hemicellulosic sugars as a carbon source for PHB production, synthetic media containing softwood hemicellulose sugars (glucose, mannose, galactose, xylose, arabinose) and the potentially inhibitory lignocellulose degradation products (acetic acid, 5-hydroxymethylfurfural (HMF), furfural, and vanillin) were fermented with the model strain Paraburkholderia sacchari IPT 101...
December 8, 2017: Biomacromolecules
Belachew Zegale Tizazu, Vijayanand S Moholkar
This study has investigated kinetic and thermodynamic features of dilute acid (2% v/v H2SO4, 1:30 w/v) hydrolysis of sugarcane bagasse. Time profiles of xylose formation in range of 100°-130 °C and treatment period of 0-120 min have been analysed with modified biphasic Saeman model. Generation of glucose, arabinose and inhibitory products (furfural, 5-HMF and acetic acid) have also been analysed. Easy-to-hydrolyse fraction of hemicellulose increased with temperature. Activation energies for hydrolysis and xylose degradation were 60...
November 21, 2017: Bioresource Technology
Jenny N M Tan-Soetedjo, Henk H van de Bovenkamp, Ria M Abdilla, Carolus B Rasrendra, Jacob van Ginkel, Hero J Heeres
We here report experimental and kinetic modeling studies on the conversion of sucrose to levulinic acid (LA) and 5-hydroxymethylfurfural (HMF) in water using sulfuric acid as the catalyst. Both compounds are versatile building blocks for the synthesis of various biobased (bulk) chemicals. A total of 24 experiments were performed in a temperature window of 80-180 °C, a sulfuric acid concentration between 0.005 and 0.5 M, and an initial sucrose concentration between 0.05 and 0.5 M. Glucose, fructose, and HMF were detected as the intermediate products...
November 15, 2017: Industrial & Engineering Chemistry Research
Chengyu Dong, Ying Wang, Han Zhang, Shao-Yuan Leu
The economic feasibility of high-concentration cellulosic bioethanol production remains challenging because it requires easily available feedstock and low energy consumption process. Simultaneous saccharification and fermentation (SSF) of sulfite pretreated Momentary pine slurry at 20% (w/w) loadings increased ethanol concentration from 59.3 g/L to 68.5 g/L by washing strategy. Effects of inhibitors in pretreatment liquor were further investigated. Besides HMF, furfural and acetic acid, other inhibitors and/or their synergistic effects proved to be responsible for a lower fermentability...
November 11, 2017: Bioresource Technology
Changwei Hu, Zhicheng Jiang, Pingping Zhao, Jianmei Li, Xudong Liu
The dissolution of cellulose from biomass is a crucial but complicated issue for the utilisation of biomass resources, because of the extreme insolubility of cellulose. Herein, a biphasic NaCl-H2O-tetrahydrofuran system was studied, where most of the pure microcrystalline cellulose (M-cellulose, 96.6% conversion at 220 oC) and that contained in actual biomass were converted. Nearly a half of O(6)H***O(3) intermolecular hydrogen bonding could be broken by THF in H2O-THF co-solvent system, whereas the cleavage of O(2)H***O(6) intramolecular hydrogen bonding by H2O was significantly inhibited...
November 17, 2017: ChemSusChem
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