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https://www.readbyqxmd.com/read/28231180/evolution-of-the-maillard-reaction-in-glutamine-or-arginine-dextrinomaltose-model-systems
#1
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
#2
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)
https://www.readbyqxmd.com/read/28230746/oxidation-of-5-chloromethylfurfural-cmf-to-2-5-diformylfuran-dff
#3
Ana I Vicente, Jaime A S Coelho, Svilen P Simeonov, Hristina I Lazarova, Margarita D Popova, Carlos A M Afonso
2,5-Diformylfuran (DFF) is an important biorenewable building block, namely for the manufacture of new polymers that may replace existing materials derived from limited fossil fuel resources. The current reported methods for the preparation of DFF are mainly derived from the oxidation of 5-hydroxymethylfurfural (HMF) and, to a lesser extent, directly from fructose. 5-Chloromethylfurfural (CMF) has been considered an alternative to HMF as an intermediate building block due to its advantages regarding stability, polarity, and availability from glucose and cellulose...
February 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28225129/one-pot-conversion-of-biomass-derived-xylose-and-furfural-into-levulinate-esters-via-acid-catalysis
#4
Xun Hu, Shengjuan Jiang, Liping Wu, Shuai Wang, Chun-Zhu Li
Direct conversion of biomass-derived xylose and furfural into levulinic acid, a platform molecule, via acid-catalysis has been accomplished for the first time in dimethoxymethane/methanol. Dimethoxymethane acted as an electrophile to transform furfural into 5-hydroxymethylfurfural (HMF). Methanol suppressed both the polymerisation of the sugars/furans and the Aldol condensation of levulinic acid/ester.
February 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28222178/effect-of-meal-composition-on-postprandial-lipid-concentrations-and-lipoprotein-particle-numbers-a-randomized-cross-over-study
#5
Meena Shah, Manall Jaffery, Beverley Adams-Huet, Brian Franklin, Jonathan Oliver, Joel Mitchell
BACKGROUND: It is unclear how high-protein (HP) and high-monounsaturated fat (HMF) meals affect postprandial blood lipids and lipoprotein particle numbers (LPN). PURPOSE: To compare a HP versus a HMF meal on postprandial lipid and LPN responses. METHODS: Twenty-four participants (age: 36.3±15.0 years; body mass index: 23.6±2.0 kg/m2; 45.8% female) were fed a HP (31.9% energy from protein) and a HMF (35.2% fat and 20.7% monounsaturated fat) meal in a randomized cross-over trial design...
2017: PloS One
https://www.readbyqxmd.com/read/28216906/quality-by-design-multivariate-model-for-multicomponent-quantification-in-refining-process-of-honey
#6
Xiaoying Li, Zhisheng Wu, Xin Feng, Shanshan Liu, Xiaojie Yu, Qun Ma, Yanjiang Qiao
OBJECTIVE: A method for rapid analysis of the refining process of honey was developed based on near-infrared (NIR) spectroscopy. METHODS: Partial least square calibration models were built for the four components after the selection of the optimal spectral pretreatment method and latent factors. RESULTS: The models covered the samples of different temperatures and time points, therefore the models were robust and universal. CONCLUSIONS: These results highlighted that the NIR technology could extract the information of critical process and provide essential process knowledge of the honey refining process...
January 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28188638/assessing-the-effect-of-5-hydroxymethylfurfuralon-on-selected-components-of-immune-responses-in-mice-immunized-with-ovalbumin
#7
Mohammad Alizadeh, Hamed Khodaei, Mehran Mesgari Abbasi, Sevda Saleh-Ghadimi
BACKGROUND: 5-hydroxymethylfurfural (5-HMF) is one of the most important products of the maillard reaction. In recent years, many profitable biological effects of this compound have been demonstrated. This study sought to elucidate the anti-allergic effect of 5-HMF by investigating some selected components of the immune response in BALB/c mice immunized with ovalbumin (OVA). RESULTS: Immunized animals had an increased level of serum total and OVA-specific antibodies when compared to the control (P < 0...
February 11, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28163781/enhancement-of-furan-aldehydes-conversion-in-zymomonas-mobilis-by-elevating-dehydrogenase-activity-and-cofactor-regeneration
#8
Xia Wang, Qiuqiang Gao, Jie Bao
BACKGROUND: Furfural and 5-hydroxymethylfurfural (HMF) are the two major furan aldehyde inhibitors generated from lignocellulose dilute acid pretreatment which significantly inhibit subsequent microbial cell growth and ethanol fermentation. Zymomonas mobilis is an important strain for cellulosic ethanol fermentation but can be severely inhibited by furfural and (or) HMF. Previous study showed that Z. mobilis contains its native oxidoreductases to catalyze the conversion of furfural and HMF, but the corresponding genes have not been identified...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28160439/selective-hydrodeoxygenation-of-5-hydroxymethylfurfural-to-2-5-dimethylfuran-over-heterogeneous-iron-catalysts
#9
Jiang Li, Jun Ling Liu, He Yang Liu, Guang Yue Xu, Jun Jie Zhang, Jia Xing Liu, Guang Lin Zhou, Qin Li, Zhi Hao Xu, Yao Fu
This work provided the first example of selective hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran over heterogeneous iron catalysts. Catalyst prepared by the pyrolysis of iron-phenanthroline complex on activated carbon at 800 oC was demonstrated to be the most active heterogeneous iron catalyst. Under the optimal reaction condition, complete conversion of HMF was achieved with an 86.2% selectivity of DMF. The reaction pathway was investigated thoroughly, and the hydrogenation of C=O bond in HMF was demonstrated to be the rate-determining step during the hydrodeoxygenation, which will be accelerated greatly by using alcohol solvents as additional H-donors...
February 3, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28159285/classification-of-adulterated-honeys-by-multivariate-analysis
#10
Saber Amiry, Mohsen Esmaiili, Mohammad Alizadeh
In this research, honey samples were adulterated with date syrup (DS) and invert sugar syrup (IS) at three concentrations (7%, 15% and 30%). 102 adulterated samples were prepared in six batches with 17 replications for each batch. For each sample, 32 parameters including color indices, rheological, physical, and chemical parameters were determined. To classify the samples, based on type and concentrations of adulterant, a multivariate analysis was applied using principal component analysis (PCA) followed by a linear discriminant analysis (LDA)...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28156113/origin-of-the-regioselectivity-in-the-aldol-condensation-between-hydroxymethylfurfural-and-levulinic-acid-a-dft-investigation
#11
Liwei Zhao, Nnenna Elechi, Richard Qian, Timila B Singh, Ananda S Amarasekara, Hua-Jun Fan
Our previous work demonstrated that hydroxide ion (OH-) was able to catalyze aldol condensation reaction at room temperature between 5-hydroxymethylfurfural (HMF) and levulinic acid (LA). This work identified three primary reaction steps in this condensation reaction using density functional theory (DFT): (1) deprotonation of LA to generate LA ions, (2) LA ions addition at hydroxymethyl site of HMF, and (3) internal dehydration to form the condensation product. The reaction pathway through the C5 of LA forms a linear product that is both energy and configuration favored in the all three elementary reaction steps...
February 3, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28124823/synthesis-of-fdca-esters-without-concomitant-levulinic-acid-formation-starting-from-non-food-feedstocks
#12
Frits van der Klis, Jacco van Haveren, Daan S van Es, Harry Bitter
5-(Hydroxymethyl)-furfural (HMF) is a versatile intermediate in biomass conversion pathways, however the notoriously unstable nature of HMF imposes challenges to design selective routes to chemicals like furan-2,5-dicarboxylic acid (FDCA). Here we present a new strategy for obtaining furans, bypassing the formation of the unstable HMF. Instead of starting with glucose/fructose and thus forming HMF as an intermediate, the new route starts from uronic acids, which are abundantly present in many agro residues like e...
January 26, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28111030/catalytic-valorization-of-starch-rich-food-waste-into-hydroxymethylfurfural-hmf-controlling-relative-kinetics-for-high-productivity
#13
Iris K M Yu, Daniel C W Tsang, Alex C K Yip, Season S Chen, Lei Wang, Yong Sik Ok, Chi Sun Poon
This study aimed to maximize the valorization of bread waste, a typical food waste stream, into hydroxymethylfurfural (HMF) by improving our kinetic understanding. The highest HMF yield (30mol%) was achieved using SnCl4 as catalyst, which offered strong derived Brønsted acidity and moderate Lewis acidity. We evaluated the kinetic balance between these acidities to facilitate faster desirable reactions (i.e., hydrolysis, isomerization, and dehydration) relative to undesirable reactions (i.e., rehydration and polymerization)...
January 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28094363/photoassist-phosphorylated-tio2-as-a-catalyst-for-direct-formation-of-5-hydroxymethyl-furfural-from-glucose
#14
Masashi Hattori, Keigo Kamata, Michikazu Hara
Photo-assisted phosphorylation of an anatase TiO2 catalyst was examined to improve its catalytic performance for the direct production of 5-(hydroxymethyl)furfural (HMF), a versatile chemical platform, from glucose. In phosphorylation based on simple esterification between phosphoric acid and surface OH groups on anatase TiO2 with water-tolerant Lewis acid sites, the density of phosphates immobilized on TiO2 is limited to 2 phosphates nm(-2), which limits selective HMF production. Phosphorylation of the TiO2 surface under fluorescent light irradiation increases the surface phosphate density to 50%, which is higher than the conventional limit, thus preventing the adsorption of hydrophilic glucose molecules on TiO2 and resulting in a more selective HMF production over photoassist-phosphorylated TiO2...
February 1, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28069238/low-intensity-ultrasound-as-a-pretreatment-to-drying-of-daylilies-impact-on-enzyme-inactivation-color-changes-and-nutrition-quality-parameters
#15
Zhongyuan Zhang, Liying Niu, Dajing Li, Chunquan Liu, Rui Ma, Jiangfeng Song, Jiangtao Zhao
Effects of thermal and low intensity ultrasound combined with heat (LIUH) pretreatment prior to microwave vacuum drying on enzyme inactivation, color changes and nutrition quality properties of dried daylilies were investigated. The peroxidase (POD), ascorbic acid oxidase (AAO) and polyphenoloxidase (PPO) thermal and LIUH (0.2 and 0.4W/cm(2)) inactivation were determined and compared at 70, 80 and 90°C. Significant reduction in the POD, AAO and PPO activity was seen in daylilies after an ambient LIUH pretreatment than thermal pretreatment...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28052535/synthesis-of-renewable-triketones-diketones-and-jet-fuel-range-cycloalkanes-with-5-hydroxymethylfurfural-and-ketones
#16
Shanshan Li, Fang Chen, Ning Li, Wentao Wang, Xueru Sheng, Aiqin Wang, Yu Cong, Xiaodong Wang, Tao Zhang
A series of renewable C9 -C12 triketones with repeating [COCH2 CH2 ] units were synthesized in high carbon yields (ca. 90 %) by the aqueous-phase hydrogenation of the aldol-condensation products of 5-hydroxylmethylfurfural (HMF) and ketones over an Au/TiO2 catalyst. Compared with the reported routes, this new route has many advantages such as being environmentally friendly, having fewer steps, using a cheaper and reusable catalyst, etc. The triketones as obtained can be used as feedstocks in the production of conducting or semi-conducting polymers...
January 3, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28046627/tu-ab-202-11-tumor-segmentation-by-fusion-of-multi-tracer-pet-images-using-copula-based-statistical-methods
#17
J Lapuyade-Lahorgue, S Ruan, H Li, P Vera
PURPOSE: Multi-tracer PET imaging is getting more attention in radiotherapy by providing additional tumor volume information such as glucose and oxygenation. However, automatic PET-based tumor segmentation is still a very challenging problem. We propose a statistical fusion approach to joint segment the sub-area of tumors from the two tracers FDG and FMISO PET images. METHODS: Non-standardized Gamma distributions are convenient to model intensity distributions in PET...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28040870/innovative-methods-to-generate-clean-sugar-stream-from-biomass-feedstocks-for-efficient-fermentation
#18
REVIEW
Jung-Eun Lee, Yadhu N Guragain, Krishna P Bastola, Praveen V Vadlani
Sorghum stalks were evaluated to generate clean sugars; enzymatic hydrolysis efficiency of acid pretreated biomass was significantly low (12.3 g sugar/g pretreated biomass) compared to alkali method (49.1 g sugar/g pretreated biomass). Inhibitory compounds derived from acid pretreatment, such as hydroxymethyl furfural (HMF) and furfural, were effectively removed using an appropriate detoxification method using 1% (w/v) activated charcoal. The resin mixture containing cationic exchangers (DOWEX 50WX8) and anionic exchangers (IRA 743) in 7:3 ratio at pH 2...
December 31, 2016: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28025633/childhood-hypopigmented-mycosis-fungoides-a-rare-diagnosis
#19
Cláudia Patraquim, Maria Miguel Gomes, Carla Garcez, Filipa Leite, Tereza Oliva, António Santos, Armando Pinto
Primary cutaneous lymphomas (PCL) are rare in pediatrics. Mycosis fungoides (MF) is the most frequent PCL diagnosed in childhood. There are various clinical variants of MF, including the hypopigmented MF (HMF). We present a 5-year-old boy with an 18-month history of progressive, generalized, nonpruritic hypopigmented lesions with central lacy erythema. He had no improvement with emollients. Skin biopsy showed typical features of HMF. He was treated with topical corticosteroids and tacrolimus and narrow-band ultraviolet B (NBUVB) phototherapy, with good response...
2016: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/27995758/cellulose-biorefinery-based-on-a-combined-catalytic-and-biotechnological-approach-for-production-of-5-hmf-and-ethanol
#20
Ksenia N Sorokina, Oxana P Taran, Tatiana B Medvedeva, Yuliya V Samoylova, Alexandr V Piligaev, Valentin N Parmon
In this study, a combination of catalytic and biotechnological processes was proposed for the first time for application in a cellulose biorefinery for the production of 5-hydroxymethylfurfural (5-HMF) and bioethanol. Hydrolytic dehydration of the mechanically activated microcrystalline cellulose over a carbon-based mesoporous Sibunt-4 catalyst resulted in moderate yields of glucose and 5-HMF (21.1-25.1 and 6.6-9.4 %). 5-HMF was extracted from the resulting mixture with isobutanol and subjected to ethanol fermentation...
December 20, 2016: ChemSusChem
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