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https://www.readbyqxmd.com/read/29148211/effect-of-tetrahydrofuran-on-the-solubilisation-and-depolymerisation-of-cellulose-in-a-biphasic-system
#1
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
https://www.readbyqxmd.com/read/29146374/formation-kinetics-of-furfuryl-alcohol-in-a-coffee-model-system
#2
Abdullatif Albouchi, Michael Murkovic
The production of furfuryl alcohol from green coffee during roasting and the effect of multiple parameters on its formation were studied employing HPLC-DAD. Results show that coffee produces furfuryl alcohol in larger quantities (418µg/g) compared to other beans or seeds (up to 132µg/g) roasted under the same conditions. The kinetics of furfuryl alcohol production resemble those of other process contaminants (e.g., HMF, acrylamide) produced in coffee roasting, with temperature and time of roasting playing significant roles in quantities formed...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29146351/impact-of-rapeseed-press-cake-on-maillard-reaction-in-a-cookie-model-system
#3
Antonio Dario Troise, Jonathan Desmond Wilkin, Alberto Fiore
Rapeseed press-cake (RPC) is a byproduct of rapeseed oil production, rich in proteins and fiber. The aim of this study was to investigate the impact of cold pressed RPC, RPC fiber isolate and RPC alkaline extract on the formation of acrylamide and 5-hydroxymethylfufural (HMF) in cookies. Both compounds were influenced by the ingredients: the addition of RPC led to a significant dose-dependent increase of HMF in the cookies and to an increase of acrylamide up to 66.9%. On the contrary, acrylamide concentration was reduced down to 39...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29146350/emerging-approach-for-analytical-characterization-and-geographical-classification-of-moroccan-and-french-honeys-by-means-of-a-voltammetric-electronic-tongue
#4
Nadia El Alami El Hassani, Khalid Tahri, Eduard Llobet, Benachir Bouchikhi, Abdelhamid Errachid, Nadia Zine, Nezha El Bari
Moroccan and French honeys from different geographical areas were classified and characterized by applying a voltammetric electronic tongue (VE-tongue) coupled to analytical methods. The studied parameters include color intensity, free lactonic and total acidity, proteins, phenols, hydroxymethylfurfural content (HMF), sucrose, reducing and total sugars. The geographical classification of different honeys was developed through three-pattern recognition techniques: principal component analysis (PCA), support vector machines (SVMs) and hierarchical cluster analysis (HCA)...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29136844/physicochemical-characterization-of-lavandula-spp-honey-with-ft-raman-spectroscopy
#5
Ofélia Anjos, António J A Santos, Vasco Paixão, Letícia M Estevinho
This study aimed to evaluate the potential of FT-Raman spectroscopy in the prediction of the chemical composition of Lavandula spp. monofloral honey. Partial Least Squares (PLS) regression models were performed for the quantitative estimation and the results were correlated with those obtained using reference methods. Good calibration models were obtained for electrical conductivity, ash, total acidity, pH, reducing sugars, hydroxymethylfurfural (HMF), proline, diastase index, apparent sucrose, total flavonoids content and total phenol content...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29130985/heptamethoxyflavone-reduces-phosphodiesterase-activity-and-t-cell-growth-in-vitro
#6
Yui Hamada, Mitsunari Nakajima, Kazuna Tsuzuki, Yoshiaki Amakura, Morio Yoshimura, Satoshi Okuyama, Yoshiko Furukawa
In a previous study, we reported that interleukin-4 production was reduced in spleen cells of mice administered 3,5,6,7,8,3',4'-heptamethoxyflavone (HMF), which is a polymethoxyflavone found at high concentrations in the peel of various citrus fruits. In this study, we investigated the function of HMF on the growth of T cells cultured from the spleens of mice. HMF decreased the reduction of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) by anti-CD3/CD28 antibody-stimulated mouse spleen cells...
November 8, 2017: International Archives of Allergy and Immunology
https://www.readbyqxmd.com/read/29120770/a-green-ionic-liquid-based-vortex-forced-mspd-method-for-the-simultaneous-determination-of-5-hmf-and-iridoid-glycosides-from-fructus-corni-by-ultra-high-performance-liquid-chromatography
#7
Kunze Du, Jin Li, Yun Bai, Mingrui An, Xiu-Mei Gao, Yan-Xu Chang
A simple and green ionic liquid-based vortex-forced matrix solid phase dispersion (IL-VFMSPD) method was presented to simultaneously extract 5-hydroxymethyl furfurol (5-HMF) and iridoid glycosides in Fructus Corni by ultra-high performance liquid chromatography. Ionic liquid was used as a green elution reagent in vortex-forced MSPD process. A few parameters such as the type of ionic liquid, the type of sorbent, ratio of sample to sorbent, the concentration and volume of ionic liquid, grinding time and vortex time, were investigated in detail and an orthogonal design experiment was introduced to confirm the best conditions in this procedure...
April 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29109463/a-role-for-small-secreted-proteins-ssps-in-a-saprophytic-fungal-lifestyle-ligninolytic-enzyme-regulation-in-pleurotus-ostreatus
#8
Daria Feldman, David J Kowbel, N Louise Glass, Oded Yarden, Yitzhak Hadar
Small secreted proteins (SSPs), along with lignocellulose degrading enzymes, are integral components of the secretome of Pleurotus ostreatus, a white rot fungus. In this study, we identified 3 genes (ssp1, 2 and 3) encoding proteins that are annotated as SSPs and that exhibited of ~4,500- fold expression, 24 hr following exposure to the toxic compound 5-hydroxymethylfurfural (HMF). Homologues to genes encoding these SSPs are present in the genomes of other basidiomycete fungi, however the role of SSPs is not yet understood...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29108628/furfural-and-5-hydroxymethyl-furfural-degradation-using-recombinant-manganese-peroxidase
#9
Kelsey L Yee, Lauren E Jansen, Curtis A Lajoie, Michael H Penner, Lettie Morse, Christine J Kelly
Biomass pretreatment-derived degradation compounds, such as furfural and 5-hydroxymethyl-furfural (HMF), inhibit the growth of fermentation microorganisms that utilize biomass to produce fuels and chemicals. Here we report that recombinant manganese peroxidase (rMnP) produced from the yeast Pichia pastoris can degrade furfural and HMF making them less toxic to microorganisms. Treatment with rMnP or manganese(III) acetate reduced furfural and HMF concentrations in a dose-dependent manner. Furfural disappearance was accompanied by malonate disappearance and accumulation of four distinct degradation products...
January 2018: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/29090540/-research-progress-of-5-hydroxymethylfurfural-a-safety-related-substance-in-traditional-chinese-medicine-injections
#10
REVIEW
Zhuo Pan, He-Xin Shao, Ting Liu, Xiao-Yan Lu, Xiao-Hui Fan
Screening out the safety-related substances and establishing the corresponding standard has been a key research issue to improve the safety of traditional Chinese medicine injections(TCMIs). 5-HMF which widely exists in sugar-containing TCMIs has long been considered as an important safety-related substance. In this review, we summarizes the research progress on the toxicology of 5-HMF as well as the content and standards of 5-HMF in TCMIs.Therein, both literature summary and analysis results indicate that there are lack of toxicology researches of 5-HMF and its metabolites in TCMIs, although the potential toxicity of 5-HMF and its metabolites has been reported...
May 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29090286/aldol-condensation-of-biomass-derived-platform-molecules-over-amine-grafted-hierarchical-fau-type-zeolite-nanosheets-zeolean-featuring-basic-sites
#11
Thittaya Yutthalekha, Duangkamon Suttipat, Saros Salakhum, Anawat Thivasasith, Somkiat Nokbin, Jumras Limtrakul, Chularat Wattanakit
The superior catalytic performance of amine-grafted hierarchical basic FAU-type zeolite nanosheets for the aldol condensation of 5-hydroxymethylfurfural (5-HMF) and acetone (Ac) has been achieved due to the synergistic effect of hierarchical structures, featuring basic active sites together with surface modification. This results in an unprecedented yield of 4-[5-(hydroxymethyl)furan-2-yl]but-3-en-2-one (HMB) close to 100%. The catalytic activity can be easily tuned by changing the degree of basicity corresponding to the nature of basic sites and surface modification...
November 1, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29058904/formation-of-a-hydroxymethylfurfural-cysteine-adduct-and-its-absorption-and-cytotoxicity-in-caco-2-cells
#12
Qianzhu Zhao, Yueyu Zou, Caihuan Huang, Ping Lan, Jie Zheng, Shiyi Ou
Adducts of 5-hydroxymethylfurfural (HMF)-amino acids are formed during food processing and digestion; the elimination capacity of in vitro intestinal digests of biscuits, instant noodles, and potato crisps for HMF is 652, 727, and 540 μg/g, respectively. However, the safety of these adducts is unknown. In this study, an HMF-cysteine adduct named 1-dicysteinethioacetal-5-hydroxymehtylfurfural (DCH), which was found to be produced in the gastrointestinal tract after HMF intake, was prepared to test its effect toward Caco-2 cells...
October 31, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29051611/porous-nitrogen-enriched-carbonaceous-material-from-marine-waste-chitosan-derived-carbon-nitride-catalyst-for-aerial-oxidation-of-5-hydroxymethylfurfural-hmf-to-2-5-furandicarboxylic-acid
#13
Sanny Verma, Mallikarjuna N Nadagouda, Rajender S Varma
Chitosan-derived, porous nitrogen-enriched carbonaceous carbon nitride catalyst (PCNx) has been synthesized from marine waste and its use demonstrated in a metal-free heterogeneous selective oxidation of 5-hydroxymethyl-furfural (HMF) to 2,5-furandicarboxylic acid (FDCA) using aerial oxygen under mild reaction conditions.
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29037722/effect-of-late-harvest-and-floral-origin-on-honey-antibacterial-properties-and-quality-parameters
#14
I N Pasias, I K Kiriakou, A Kaitatzis, A E Koutelidakis, C Proestos
Honey is a food of high importance due to its nutritional value. The effect of late harvest and pollen composition on honey quality and antimicrobial activity was studied. Different physicochemical parameters were determined as quality indicators. The HMF content, diastase activity, sugar content, antimicrobial activity, and hydrogen peroxide content were selected in current work as the crucial parameters for evaluation. The results proved that the late harvested honey sample showed a vast number of pollens from different blossom periods...
March 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29023414/3-5-6-7-8-3-4-heptamethoxyflavone-ameliorates-depressive-like-behavior-and-hippocampal-neurochemical-changes-in-chronic-unpredictable-mild-stressed-mice-by-regulating-the-brain-derived-neurotrophic-factor-requirement-for-erk-activation
#15
Atsushi Sawamoto, Satoshi Okuyama, Yoshiaki Amakura, Morio Yoshimura, Takashi Yamada, Hidehiko Yokogoshi, Mitsunari Nakajima, Yoshiko Furukawa
We previously reported that the subcutaneous administration of 3,5,6,7,8,3',4'-heptamethoxyflavone (HMF), a citrus polymethoxyflavone, attenuated depressive-like behavior and increased the expression of brain-derived neurotrophic factor (BDNF) in the hippocampus of a corticosterone-induced depression-like mouse model. We herein demonstrated that (1) HMF was detectable in the brain 10 and 30 min after its oral administration, (2) orally administered HMF improved chronic unpredictable mild stress (CUMS)-induced pathological conditions, including body weight loss and depressive-like behavior, and CUMS-induced neurochemical changes, such as reduction in BDNF expression, decrease in neurogenesis, and decreased level of phosphorylated calcium-calmodulin-dependent protein kinase II in the hippocampus, and (3) these effects of HMF were inhibited by the pre-administration of U0126, a mitogen-activated protein (MAP) kinase inhibitor...
October 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29022972/heterogeneous-mesoporous-manganese-cobalt-oxide-catalysts-for-selective-oxidation-of-5-hydroxymethylfurfural-to-2-5-diformylfuran
#16
Sourav Biswas, Biswanath Dutta, Arun Mannodi-Kanakkithodi, Ryan Clarke, Wenqiao Song, Ramamurthy Ramprasad, Steven L Suib
We report a heterogeneous catalytic protocol for the oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) using a mesoporous manganese doped cobalt oxide material. The absence of precious metals and additives, use of air as the sole oxidant, and easy isolation of products, along with proper catalyst reusability, make our catalytic protocol attractive for the selective oxidation of HMF to DFF.
August 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29020768/visible-light-driven-valorization-of-biomass-intermediates-integrated-with-h2-production-catalyzed-by-ultrathin-ni-cds-nanosheets
#17
Guanqun Han, Yan-Huan Jin, R Alan Burgess, Nicholas E Dickenson, Xiao-Ming Cao, Yujie Sun
Photocatalytic upgrading of crucial biomass-derived intermediate chemicals (i.e., furfural alcohol, 5-hydroxymethylfurfural (HMF)) to value-added products (aldehydes and acids) was carried out on ultrathin CdS nanosheets (thickness ∼1 nm) decorated with nickel (Ni/CdS). More importantly, simultaneous H2 production was realized upon visible light irradiation under ambient conditions utilizing these biomass intermediates as proton sources. The remarkable difference in the rates of transformation of furfural alcohol and HMF to their corresponding aldehydes in neutral water was observed and investigated...
October 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28956917/selective-oxidation-of-5-hydroxymethylfurfural-to-2-5-furandicarboxylic-acid-using-o2-and-a-photocatalyst-of-co-thioporphyrazine-bonded-to-g-c3n4
#18
Shuai Xu, Peng Zhou, Zehui Zhang, Changjun Yang, Bingguang Zhang, Kejian Deng, Steven Bottle, Huaiyong Zhu
Selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is one of the key reactions for producing chemical commodities from biomass and their derivatives. The challenge for this reaction is to develop an efficient catalytic process that can be conducted under mild conditions (room temperature and atmospheric pressure, using oxygen molecules in air as the oxidant) and a recyclable catalyst. Herein we report a photocatalyst of cobalt thioporphyrazine (CoPz) dispersed on g-C3N4 (abbreviated as CoPz/g-C3N4), which exhibits excellent catalytic activity toward the selective oxidation of HMF into FDCA under simulated sunlight using oxygen molecules in air as a benign oxidant...
October 9, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28948457/an-aerobic-detoxification-photofermentation-by-rhodospirillum-rubrum-for-converting-soy-sauce-residue-into-feed-with-moderate-pretreatment
#19
Jian Zhang, Jie Yuan, Wen-Xue Zhang, Wen-You Zhu, Fang Tu, Ya Jiang, Chuan-Ze Sun
This paper reports an effective process for converting soy sauce residue into feeds by combining moderate acid hydrolysis and ammonization with Rhodospirillum rubrum fermentation. After pretreatment with dilute sulfuric or phosphoric acid (1%, w/w) at 100 °C, materials were subjected to fermentation under several gases (N2, CO2, and air) and different light intensities in a 2-L fermentor. Following sulfuric acid treatment, the true protein increased from 188 to 362 g kg(-1) and the crude fiber decreased from 226 to 66 g kg(-1) after fermentation at 0...
September 25, 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28946283/investigation-and-kinetic-evaluation-of-the-reactions-of-hydroxymethylfurfural-with-amino-and-thiol-groups-of-amino-acids
#20
Aytül Hamzalıoğlu, Vural Gökmen
In this study, reactions of hydroxymethylfurfural (HMF) with selected amino acids (arginine, cysteine and lysine) were investigated in HMF-amino acid (high moisture) and Coffee-amino acid (low moisture) model systems at 5, 25 and 50°C. The results revealed that HMF reacted efficiently and effectively with amino acids in both high and low moisture model systems. High-resolution mass spectrometry (HRMS) analyses of the reaction mixtures confirmed the formations of Michael adduct and Schiff base of HMF with amino acids...
February 1, 2018: Food Chemistry
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