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https://www.readbyqxmd.com/read/28441731/polyphenolic-compounds-and-digestive-enzymes-in-vitro-non-covalent-interactions
#1
REVIEW
Alejandra I Martinez-Gonzalez, Ángel G Díaz-Sánchez, Laura A de la Rosa, Claudia L Vargas-Requena, Ismael Bustos-Jaimes, And Emilio Alvarez-Parrilla
The digestive enzymes-polyphenolic compounds (PCs) interactions behind the inhibition of these enzymes have not been completely studied. The existing studies have mainly analyzed polyphenolic extracts and reported inhibition percentages of catalytic activities determined by UV-Vis spectroscopy techniques. Recently, pure PCs and new methods such as isothermal titration calorimetry and circular dichroism have been applied to describe these interactions. The present review focuses on PCs structural characteristics behind the inhibition of digestive enzymes, and progress of the used methods...
April 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28441630/winter-to-summer-change-in-vitamin-d-status-reduces-systemic-inflammation-and-bioenergetic-activity-of-human-peripheral-blood-mononuclear-cells
#2
Emily K Calton, Kevin N Keane, Raquel Raizel, Jordan Rowlands, Mario J Soares, Philip Newsholme
BACKGROUND: Vitamin D status [25(OH)D] has recently been reported to be associated with altered cellular bioenergetic profiles of peripheral blood mononuclear cells (PBMCs). No study has tracked the seasonal variation of 25(OH)D and its putative influence on whole body energy metabolism, cellular bioenergetic profiles, inflammatory markers and clinical chemistry. MATERIAL AND METHODS: Whole body energy metabolism and substrate utilisation were measured by indirect calorimetry...
April 13, 2017: Redox Biology
https://www.readbyqxmd.com/read/28441541/molecular-interaction-of-2-4-diacetylphloroglucinol-dapg-with-human-serum-albumin-hsa-the-spectroscopic-calorimetric-and-computational-investigation
#3
Pragna Lakshmi T, Moumita Mondal, Krishna Ramadas, Sakthivel Natarajan
Drug molecule interaction with human serum albumin (HSA) affects the distribution and elimination of the drug. The compound, 2,4-diacetylphloroglucinol (DAPG) has been known for its antimicrobial, antiviral, antihelminthic and anticancer properties. However, its interaction with HSA is not yet reported. In this study, the interaction between HSA and DAPG was investigated through steady-state fluorescence, time-resolved fluorescence (TRF), circular dichroism (CD), Fourier transform infrared (FT-IR) spectroscopy, isothermal titration calorimetry (ITC), molecular docking and molecular dynamics simulation (MDS)...
April 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28441023/hydrophobic-nanoparticles-modify-the-thermal-release-behavior-of-liposomes
#4
Matthew Ryan Preiss, Ashley E Hart, Christopher L Kitchens, Geoffrey D Bothun
Understanding the effect of embedded nanoparticles on the characteristics and behavior of lipid bilayers is critical to the development of lipid-nanoparticle assemblies (LNAs) for biomedical applications. In this work we investigate the effect of hydrophobic nanoparticle size and concentration on liposomal thermal release behavior. Decorated LNAs (D-LNAs) were formed by embedding 2 nm (GNP2) and 4 nm (GNP4) dodecanethiol-capped gold nanoparticles into DPPC liposomes at lipid to nanoparticle ratios (L:N) of 25,000:1, 10,000:1, and 5,000:1...
April 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28440031/production-characterization-and-assessment-of-a-stable-analog-of-the-response-regulator-chey-phosphate-from-thermotoga-maritima
#5
Matthew S Beyersdorf, Ria Sircar, Daniel B Lookadoo, Cory Bottone, Michael J Lynch, Brian R Crane, Christopher J Halkides
Phosphorylation of CheY promotes association with the flagellar motor and ultimately controls the directional bias of the motor. However, biochemical studies of activated CheY-phosphate have been challenging due to the rapid hydrolysis of the aspartyl-phosphate in vitro. An inert analog of Tm CheY-phosphate, phosphono-CheY, was synthesized by chemical modification and purified by cation-exchange chromatography. Changes in HPLC retention times, chemical assays for phosphate and free thiol, and mass spectrometry experiments demonstrate modification of Cys54 with a phosphonomethyl group...
April 25, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28438549/poly-methyl-vinyl-ether-co-maleic-acid-pectin-based-hydrogel-forming-systems-gel-film-and-microneedles
#6
Yusuf Kemal Demir, Ayşegül Ülkü Metin, Betül Şatıroğlu, Mehmet Ertuğrul Solmaz, Veysel Kayser, Karsten Mäder
Cross-linking of natural and synthetic polymers is widely explored to achieve the desired material properties (mechanical strength, drug loading capacity, swelling and erosion rates). However, the potential of polymers produced by crosslinking poly (methyl vinyl ether-co-maleic acid) (PMVE/MA) and pectin (PE) in pharmaceutics is mainly unexplored so far. We have investigated the effect of various esterification conditions and pectin content on the physicochemical properties. Materials have been characterized by fourier transform infrared, differential scanning calorimetry and scanning electron microscopy...
April 21, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28437835/pten-downregulation-promotes-%C3%AE-oxidation-to-fuel-hypertrophic-liver-growth-after-hepatectomy-in-mice
#7
Ekaterina Kachaylo, Christoph Tschuor, Nicolas Calo, Nathalie Borgeaud, Perparim Limani, Anne-Christine Piguet, Jean-Francois Dufour, Michelangelo Foti, Rolf Graf, Pierre A Clavien, Bostjan Humar
In regenerating liver, hepatocytes accumulate lipids before the major wave of parenchymal growth. This transient, regeneration-associated steatosis (TRAS) is required for liver recovery, but its purpose is unclear. The tumor suppressor PTEN is a key inhibitor of the AKT-mTOR axis that regulates growth and metabolic adaptations after hepatectomy. In quiescent liver, PTEN causes pathological steatosis when lost, while its role in regenerating liver remains unknown. Here, we show that PTEN downregulation promotes liver growth in a TRAS-dependent way...
April 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28437446/solid-state-characterization-and-theoretical-study-of-non-linear-optical-properties-of-a-fluoro-n-acylhydrazide-derivative
#8
Rosemberg F N Rodrigues, Leonardo R Almeida, Florisberto G Dos Santos, Paulo S Carvalho, Wanderson C de Souza, Kleber S Moreira, Gilberto L B de Aquino, Clodoaldo Valverde, Hamilton B Napolitano, Basílio Baseia
In this work we determine the linear and non-linear optical properties of a Fluoro-N-Acylhydrazide derivative (FBHZ), using a combined supermolecule approach and an iterative scheme of electrostatic polarization, where the atoms of neighbouring molecules are represented by point charges. Our results for non-linear optics (NLO) are comparable to those found experimentally, suggesting that FBHZ constitutes an attractive object for future studies and for use as an interesting material for third-order NLO applications...
2017: PloS One
https://www.readbyqxmd.com/read/28436702/a-novel-matrix-dispersion-based-on-phospholipid-complex-for-improving-oral-bioavailability-of-baicalein-preparation-in-vitro-and-in-vivo-evaluations
#9
Yang Zhou, Wujun Dong, Jun Ye, Huazhen Hao, Junzhuo Zhou, Renyun Wang, Yuling Liu
Phospholipid complex is one of the most successful approaches for enhancing oral bioavailability of poorly absorbed plant constituents. But the sticky property of phospholipids results in an unsatisfactory dissolution of drugs. In this study, a matrix dispersion of baicalein based on phospholipid complex (BaPC-MD) was first prepared by a discontinuous solvent evaporation method, in which polyvinylpyrrolidone-K30 (PVP-K30) was employed for improving the dispersibility of baicalein phospholipid complex (BaPC) and increasing dissolution of baicalein...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28435723/formamidinium-iodide-crystal-structure-and-phase-transitions
#10
Andrey A Petrov, Eugene A Goodilin, Alexey B Tarasov, Vladimir A Lazarenko, Pavel V Dorovatovskii, Victor N Khrustalev
At a temperature of 100 K, CH5N2(+)·I(-) (I), crystallizes in the monoclinic space group P21/c. The formamidinium cation adopts a planar symmetrical structure [the r.m.s. deviation is 0.002 Å, and the C-N bond lengths are 1.301 (7) and 1.309 (8) Å]. The iodide anion does not lie within the cation plane, but deviates from it by 0.643 (10) Å. The cation and anion of I form a tight ionic pair by a strong N-H⋯I hydrogen bond. In the crystal of I, the tight ionic pairs form hydrogen-bonded zigzag-like chains propagating toward [20-1] via strong N-H⋯I hydrogen bonds...
April 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28435390/synthesis-and-characterization-of-silver-nanoparticles-from-bis-alkylamine-silver-carboxylate-precursors
#11
Pawel Uznanski, Joanna Zakrzewska, Frederic Favier, Slawomir Kazmierski, Ewa Bryszewska
A comparative study of amine and silver carboxylate adducts [R1COOAg-2(R2NH2)] (R1 = 1, 7, 11; R2 = 8, 12) as a key intermediate in NPs synthesis is carried out via differential scanning calorimetry, solid-state FT-infrared spectroscopy, (13)C CP MAS NMR, powder X-ray diffraction and X-ray photoelectron spectroscopy, and various solution NMR spectroscopies ((1)H and (13)C NMR, pulsed field gradient spin-echo NMR, and ROESY). It is proposed that carboxyl moieties in the presence of amine ligands are bound to silver ions via chelating bidentate type of coordination as opposed to bridging bidentate coordination of pure silver carboxylates resulting from the formation of dimeric units...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28435141/thermodynamic-investigation-of-carbamazepine-saccharin-co-crystal-polymorphs
#12
Sudhir K Pagire, Niten Jadav, Venu R Vangala, Benjamin Whiteside, Anant Paradkar
Polymorphism in active pharmaceutical ingredients (APIs) can be regarded as critical for the potential that crystal form can have on the quality, efficacy and safety of the final drug product. The current contribution aims to characterize thermodynamic interrelationship of a dimorphic co-crystal, FI and FII, involving carbamazepine (CBZ) and saccharin (SAC) molecules. Supramolecular synthesis of CBZ-SAC FI and FII have been performed using thermo-kinetic methods and systematically characterized by differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), solubility and slurry measurements...
April 20, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28434915/x-ray-crystallography-and-electron-microscopy-of-cross-and-multi-module-nonribosomal-peptide-synthetase-proteins-reveal-a-flexible-architecture
#13
Michael J Tarry, Asfarul S Haque, Khanh Huy Bui, T Martin Schmeing
Nonribosomal peptide synthetases (NRPS) are macromolecular machines that produce peptides with diverse activities. Structural information exists for domains, didomains, and even modules, but little is known about higher-order organization. We performed a multi-technique study on constructs from the dimodular NRPS DhbF. We determined a crystal structure of a cross-module construct including the adenylation (A) and peptidyl carrier protein (PCP) domains from module 1 and the condensation domain from module 2, complexed with an adenosine-vinylsulfonamide inhibitor and an MbtH-like protein (MLP)...
April 17, 2017: Structure
https://www.readbyqxmd.com/read/28434207/maternal-rates-of-lipolysis-and-glucose-production-in-late-pregnancy-are-independently-related-to-fetal-weight
#14
Barbro Diderholm, Kathryn Beardsall, Peter Murgatroyd, Christoph Lees, Jan Gustafsson, David Dunger
OBJECTIVE: Associations between maternal glucose levels and increased fetal growth are well established and independent relationships with maternal weight, weight gain and insulin resistance are also observed. The relative roles of lipolysis and glucose production in the determination of these observations remain unclear. DESIGN: We examined, through detailed physiological studies, the relationship between maternal late gestational energy substrate production (glucose and glycerol), maternal weight and weight gain, and estimated fetal size in the third trimester...
April 23, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28433164/characterization-and-application-of-cellulose-acetate-synthesized-from-sugarcane-bagasse
#15
R G Candido, G G Godoy, Adilson R Gonçalves
The synthesis and application of cellulose acetate (CA) from sugarcane bagasse were investigated. Firstly, cellulose was extracted by a sequential treatment with H2SO4 (10% v/v), NaOH (5% w/v), EDTA (0.5% w/V), and H2O2 (5% v/v), and characterized by X-ray diffraction (DRX). After the acetylation of the extracted cellulose, CA was characterized using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA), and was applied in the membrane production...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28433152/biodegradable-blends-of-urea-plasticized-thermoplastic-starch-utps-and-poly-%C3%AE%C2%B5-caprolactone-pcl-morphological-rheological-thermal-and-mechanical-properties
#16
Ana Carolina Correa, Vitor Brait Carmona, José Alexandre Simão, Luiz Henrique Capparelli Mattoso, José Manoel Marconcini
Biodegradable blends of urea plasticized thermoplastic starch (UTPS) and poly(ε-caprolactone) (PCL) were prepared in a co-rotating twin screw extruder. The UTPS and PCL content varied in a range of 25wt%. The materials were characterized by capillary rheometry, scanning electron microscopy (SEM), termogravimetry (TGA), differential scanning calorimetry (DSC) and tensile tests. Capillary rheometry showed better interaction between UTPS and PCL at 110°C than at 130°C. SEM showed immiscibility of all blends and good dispersion of UTPS in PCL matrix up to 50wt%...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28431775/cinacalcet-hydrochloride
#17
Gamal A E Mostafa, Abdullah A Al-Badr
Cinacalcet hydrochloride is a calcimimetic agent that increases the sensitivity to the extracellular calcium of the calcium-sensing receptors of the parathyroid gland which regulates parathyroid hormone secretion. This comprehensive profile on cinacalcet hydrochloride starts with a description: nomenclature, formulae, chemical structure, elemental composition, and appearance. The uses and applications of the drug are included. The methods of preparation of cinacalcet hydrochloride are described and their respective schemes are outlined...
2017: Profiles of Drug Substances, Excipients, and related Methodology
https://www.readbyqxmd.com/read/28431343/measurement-of-physical-activity-levels-in-the-intensive-care-unit-and-functional-outcomes-an-observational-study
#18
Lisa J Beach, Kate Fetterplace, Lara Edbrooke, Selina M Parry, Rachel Curtis, Thomas Rechnitzer, Sue Berney, Linda Denehy
PURPOSE: Primary aims were: (1) objectively quantify levels of physical activity with the sensewear armband mini-fly motion sensor (SWA-MF), (2) evaluate the correlation of SWA-MF measurement of active and resting energy expenditure against the ICU Mobility scale (IMS) and indirect calorimetry respectively. MATERIALS AND METHODS: Adults mechanically ventilated ≥48h and anticipated to remain in ICU≥5days were included. Physical activity (PA) was measured using a SWA-MF (over the first five days); energy expenditure was measured with both the SWA-MF and the Deltatrac II metabolic cart on day three; highest level of mobility was assessed on the IMS...
April 7, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28430440/insights-on-the-physical-state-reached-by-an-active-pharmaceutical-ingredient-upon-high-energy-milling
#19
Benjamin Schammé, Xavier Monnier, Nicolas Couvrat, Laurent Delbreilh, Valérie Dupray, Eric Dargent, Gérard Coquerel
In this article, we study the physicochemical transformations of crystalline Quinidine upon high-energy milling. The investigations have been achieved by classical, high performance and fast scanning calorimetry combined with broadband dielectric spectroscopy and X-ray powder diffraction. As evolution of crystalline Quinidine with time of milling revealed a prominent sub-Tg cold-crystallization phenomenon, independent and complementary analytical techniques were implemented. Fast scanning calorimetry was performed for the first time on a milled pharmaceutical compound to postpone the crystallization event to higher temperatures...
April 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28430150/synthesis-and-self-assembly-of-shape-amphiphiles-based-on-poss-dendron-conjugates
#20
Yu Shao, Minyuan Ding, Yujie Xu, Fangjia Zhao, Hui Dai, Xia-Ran Miao, Shuguang Yang, Hui Li
Shape has been increasingly recognized as an important factor for self-assembly. In this paper, a series of shape amphiphiles have been built by linking polyhedral oligomeric silsesquioxane (POSS) and a dendron via linkers of different lengths. Three conjugates of octahedral silsesquioxanes (T₈-POSS) and dendron are designed and synthesized and are referred to as isobutyl T₈-POSS gallic acid derivatives (BPOSS-GAD-1, BPOSS-GAD-2, BPOSS-GAD-3). These samples have been fully characterized by ¹H-NMR, (13)C-NMR, Fourier transform infrared (FT-IR) spectroscopy and matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry to establish their chemical identity and purity...
April 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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