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https://www.readbyqxmd.com/read/28544895/vibrational-spectroscopy-of-the-mass-selected-tetrahydrofurfuryl-alcohol-monomers-and-its-dimers-in-gas-phase-using-ir-depletion-and-vuv-single-photon-ionization
#1
Pengchao Wang, Yongjun Hu, Huaqi Zhan, Jiaxin Chen, Shan Jin, Wentao Song, Yujian Li
Tetrahydrofurfuryl alcohol (THFA, C5H10O2) is a close chemical analog of the sugar rings present in the phosphate-deoxyribose backbone structure of the nucleic acids. In present report, the infrared (IR) spectra of the size-selected THFA monomer and its dimer have been investigated in a pulsed supersonic jet using infrared-vacuum ultraviolet (VUV) ionization. Herein, the laser light at 118nm wavelength served as the source of "soft" ionization in a time-of-flight mass spectrometer. The IR features for the monomers located at 3622cm(-1) can be assigned to the intramolecular hydrogen bonding stretch vibrations mainly referring to A and C conformers...
May 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28544619/design-and-synthesis-of-some-acridine-piperazine-hybrids-for-the-improvement-of-cognitive-dysfunction
#2
Anuradha Sharma, Poonam Piplani
A novel series of hybrid molecules (5a-5m) was designed, synthesized and evaluated as multifunctional cholinesterase (ChE) inhibitors against cognitive dysfunction. Heterocyclic moieties acridine and piperazine were conjugated with suitable linkers in a single scaffold and the structures of the target compounds were confirmed by IR, (1) H NMR, (13) C NMR and LC-MS analysis. The pharmacological activity of synthesized compounds was evaluated using behavioral models of amnesia viz. step down passive avoidance and elevated plus maze at a dose 0...
May 25, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28540988/pathologic-impact-of-insulin-resistance-and-sensitivity-on-the-severity-of-liver-histopathology-in-pediatric-non-alcoholic-steatohepatitis
#3
Byung Han Park, Jung Min Yoon, Ja Hye Kim, Jin Hwa Moon, Young Ho Lee, Se Min Jang, Yong Joo Kim
PURPOSE: Insulin resistance (IR) has an important role in the development of non-alcoholic steatohepatitis (NASH). We aimed to analyze the association between liver histopathology and IR in pediatric patients with NASH. MATERIALS AND METHODS: In 24 children with non-alcoholic fatty liver disease (NAFLD), we investigated whether the hepatic pathologic characteristics have relations with following three biochemical indices; IR index including homeostasis model assessment of IR (HOMA-IR), quantitative insulin sensitivity check index (QUICKI), and insulin sensitivity indices-free fatty acid (ISI-FFA)...
July 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28540852/association-of-polyunsaturated-saturated-fatty-acids-to-metabolic-syndrome-cardiovascular-risk-factors-and-lipoprotein-a-in-hypertensive-type-2-diabetic-patients
#4
Amira Fatma Bennacer, Elmahdi Haffaf, Ghouti Kacimi, Brahim Oudjit, Elhadj-Ahmed Koceir
The interactions between fatty acids (FA) classes: polyunsaturated (PUFA-ω6, PUFA-ω3), saturated (SFA), EPA (eicosapentaenoic acid-ω3), DHA (docosahexaenoic-ω3) and cardiometabolic syndrome (CMS) clusters, thrombosis development and vascular inflammation are subtle. This relationship is mediated by insulin resistance (IR), endothelial dysfunction, platelet aggregation disorder and atherosclerosis. OBJECTIVES: We investigated whether PUFA/SFA - PUFA-ω6/PUFA-ω3 ratios and EPA + DHA can be associated with predictive atherothrombogenic biomarkers status in type 2 diabetes (T2D) patients with or without hypertension (HT)...
June 1, 2017: Annales de Biologie Clinique
https://www.readbyqxmd.com/read/28540308/relationships-between-composition-of-major-fatty-acids-and-fat-distribution-and-insulin-resistance-in-japanese
#5
Chikako Fujii, Toshihide Kawai, Koichiro Azuma, Yuko Oguma, Fuminori Katsukawa, Hiroshi Hirose, Kumiko Tanaka, Shu Meguro, Hideo Matsumoto, Hiroshi Itoh
Objective. The aim of this study was to evaluate the relationships between the composition of free fatty acids (FFAs) and metabolic parameters, including body fat distribution, in Japanese. Methods. The study subjects were 111 Japanese patients (54 males, 57 females). Metabolic parameters and visceral and subcutaneous fat areas as determined by CT scanning at the umbilical level were measured. Glucose tolerance test (GTT) was performed by administering 75 g glucose orally. Results. The percentage of linoleic acid (C18:2), the greatest constituent among FFAs, was negatively correlated with visceral fat area (r = -0...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28539719/ultrasound-assisted-extraction-of-ursolic-acid-from-the-flowers-of-ixora-coccinia-linn-rubiaceae-and-antiproliferative-activity-of-ursolic-acid-and-synthesized-derivatives
#6
Silvana Amadeu Ferreira Alves Monteath, Maria Aparecida M Maciel, Raquel Garcia Vega, Heloisa de Mello, Carollina de Araújo Martins, Andressa Esteves-Souza, Cerli Rocha Gattass, Aurea Echevarria
BACKGROUND: Ixora coccinea Linn (Rubiaceae) is an evergreen shrub with bright scarlet colored flowers found in several tropical and subtropical countries. It is used as an ornamental and medicinal plant. Phytochemical studies revealed that its major special metabolites are triterpene acids, such as ursolic and oleanolic acid. OBJECTIVE: To evaluate the isolation of ursolic acid (UA) (1) from methanol extracts of I. coccinea flowers through two methodologies, to prepare four derivatives, and to evaluate the cytotoxic effect against six cancer cell lines...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28538363/the-effect-of-alpha-linolenic-acid-on-glycemic-control-in-individuals-with-type-2-diabetes-a-systematic-review-and-meta-analysis-of-randomized-controlled-clinical-trials
#7
Elena Jovanovski, Dandan Li, Hoang Vi Thanh Ho, Vladimir Djedovic, Any de Castro Ruiz Marques, Esra Shishtar, Sonia Blanco Mejia, John L Sievenpiper, Russell J de Souza, Lea Duvnjak, Vladimir Vuksan
BACKGROUND: Polyunsaturated fats (PUFAs) have been shown to reduce type 2 diabetes (T2DM) risk and improve insulin responsiveness in T2DM subjects, but whether the plant sources of omega-3 PUFA (alpha-linolenic acid [ALA]) have an effect on glycemic control requires further investigation. METHODS: The parameters of interest were glycated hemoglobin (HbA1c), fasting blood glucose (FBG), fasting blood insulin (FBI), homeostatic model assessment for insulin resistance (HOMA-IR), fructosamine, and glycated albumin...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28537659/metformin-improves-the-glucose-and-lipid-metabolism-via-influencing-the-level-of-serum-total-bile-acids-in-rats-with-streptozotocin-induced-type-2-diabetes-mellitus
#8
X-M Meng, X-X Ma, Y-L Tian, Q Jiang, L-L Wang, R Shi, L Ding, S-G Pang
OBJECTIVE: To study the effects of metformin on streptozotocin-induced type 2 diabetes mellitus (T2DM) in rats. MATERIALS AND METHODS: Wistar male rats were divided into two groups: standard diet (SD, n = 20) group and high-fat diet (HFD, n = 80) group. Twenty rats in HFD group were randomly treated with metformin (EI group). After 6 weeks, among rats in HFD group, 20 rats were intraperitoneally injected with citrate buffered saline (IR group), 20 rats treated with metformin per day for 4 weeks (LI group), and 20 rats were given nothing (DM group)...
May 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28537652/efficacy-and-safety-of-very-low-calorie-ketogenic-diet-a-double-blind-randomized-crossover-study
#9
C Colica, G Merra, A Gasbarrini, A De Lorenzo, G Cioccoloni, P Gualtieri, M A Perrone, S Bernardini, V Bernardo, L Di Renzo, M Marchetti
OBJECTIVE: To verify safety respect to weight loss, cardiometabolic diseases of short-term Very low-calorie ketogenic diets (VLCKDs, <800 kcal day-1). PATIENTS AND METHODS: Randomized cross-over trial with placebo. The study had no. 2 dietary treatment (DT), conducted in two arms: (1) VLCKD1 in which 50% of protein intake is replaced with synthetic amino acids; (2) VLCKD2 with placebo. The VLCKDs (<800 kcal day-1) were different in term of protein content and quality each arm lasted three weeks (wks)...
May 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28535125/preparation-and-characterization-of-adefovir-dipivoxil-stearic-acid-cocrystal-with-enhanced-physicochemical-properties
#10
Jeong-Woong Seo, Kyu-Min Hwang, Sung-Hoon Lee, Dong-Wook Kim, Eun-Seok Park
The objectives of this study were to prepare cocrystal composed of adefovir dipivoxil (AD) and stearic acid (SA) and to investigate the enhanced properties of the cocrystal. The cocrystal was prepared by antisolvent precipitation and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRPD), and differential scanning calorimetry (DSC). The enhanced properties were evaluated by dissolution testing, permeability studies, and powder rheology analysis...
May 23, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28534843/three-new-abietane-type-diterpenoids-from-callicarpa-macrophylla-vahl
#11
Zhen-Hui Wang, Chao Niu, De-Jun Zhou, Ji-Chuan Kong, Wen-Kui Zhang
Three new abietane-type diterpenoids, named callicapoic acid M3 (1), callicapoic acid M4 (2) and callicapoic acid M5 (3), were isolated from the Callicarpa macrophylla Vahl. Their structures were established by spectroscopic techniques (IR, UV, MS, 1D and 2D NMR). All the isolated three compounds were evaluated for inhibitory activity on NO production in LPS-activated RAW 264.7 macrophage cells by using MTT assays. Compounds 1, 2 and 3 showed potent inhibitory activity, with inhibition rates of 34.47-40.13%...
May 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28532078/enhancement-of-fibroblast-growing-on-the-mannosylated-surface-of-cellulose-membranes
#12
Simone Birkheur, Paula Cristina de Sousa Faria-Tischer, Cesar A Tischer, Elisângela Flávia Pimentel, Marcio Fronza, Denise Coutinho Endringer, Anna Paola Butera, Renato Márcio Ribeiro-Viana
Bacterial cellulose membrane is a biomaterial with high value in the biomedical field. Many groups have been making efforts to promote chemical modifications of its structure and, consequently, add new characteristics. Recently, our group has developed a methodology to insert monoester succinic acid in bacterial cellulose membrane without disrupting the microfibril network and bind a protein on it. Considering the role of carbohydrates in the molecular recognition process in biological events, we continued these studies by inserting covalently multiples copies of aryl monosaccharide to bacterial cellulose succinylated and to study the in vitro tissue compatibility using fibroblasts...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532045/electrochemically-reduced-graphene-oxide-poly-glycine-composite-modified-electrode-for-sensitive-determination-of-l-dopa
#13
Venkata Narayana Palakollu, Neeta Thapliyal, Tirivashe E Chiwunze, Rajshekhar Karpoormath, Sivanandhan Karunanidhi, Srinivasulu Cherukupalli
A facile preparation strategy based on electrochemical technique for the fabrication of glycine (Poly-Gly) and electrochemically reduced graphene oxide (ERGO) composite modified electrode was developed. The morphology of the developed composite (ERGO/Poly-Gly) was investigated using field emission scanning electron microscope (FE-SEM). The composite modified glassy carbon electrode (GCE) was characterized using fourier transform-infrared (FT-IR) spectroscopy, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531991/multifunctional-polymer-drug-loading-system-with-ph-sensitive-fluorescent-and-targeting-property
#14
Xuening Fei, Shubei Li, Lingyun Cao, Baolian Zhang, Miaozhuo Yu
IA multifunctional drug loading system with pH-sensitive, fluorescent and targeting property was fabricated. Firstly, the amphipathic N-octyl-N'-(2-carboxyl-cyclohexamethenyl) chitosan (OCCC) was prepared by grafting hydrophobic octyl group and hydrophilic hexahydrophthalic anhydride onto chitosan, then it was modified with folic acid (FA) and thiazole orange (TO) using polyethylene glycol (PEG) as the link to fabricate a multifunctional drug loading system TO-PEG-OCCC-PEG-FA. Its chemical structure was determined by Fourier transform infrared spectroscopy (FT-IR), elemental analysis, differential scanning calorimetry (DSC) analysis, UV-vis and fluorescence spectrometer, and the results showed that the substitution degree of hydrophobic/hydrophilic group onto chitosan were 41...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531979/synthesis-and-characterization-of-glycyrrhizic-acid-coated-iron-oxide-nanoparticles-for-hyperthermia-applications
#15
Mostafa Saeedi, Omid Vahidi, Shahin Bonakdar
In the present study, iron oxide magnetic nanoparticles (IONPs) were synthesized using the oxidative precipitation method for biomedical applications. Glycyrrhizic acid (GA) extracted from the roots of licorice plant was used as the coating agent for the synthesized nanoparticles (GAIONPs). The crystal phase, morphology and size were investigated by XRD, FE-SEM and TEM. The saturation magnetization (ms) value of the nanoparticles was measured by VSM indicating lowered ms of the GAIONPs with respect to that of the IONPs due to the presence of GA...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28525866/theoretical-spectroscopic-insights-of-tautomers-and-enantiomers-of-penicillamine
#16
J Mendes, K J de Almeida, J L Neto, T C Ramalho, H A Duarte
B3LYP and MP2 calculations have been carried out to investigate tautomers and enantiomers of penicillamine (Pen). Their infrared (IR), ultraviolet (UV), circular dichroism (CD) and nuclear magnetic resonance (NMR) spectra were obtained at linear-response, time-dependent DFT (TD-DFT). IR, UV and NMR spectra cannot be used to identify Pen enantiomers, showing nearly equal spectral profiles. CD spectra, however, give rise to completely symmetric signals, forming a perfect specular image to each other. Distinct CD profiles were also obtained for Pen tautomers...
May 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28523459/plasma-vascular-endothelial-growth-factor-b-levels-are-increased-in-patients-with-newly-diagnosed-type-2-diabetes-mellitus-and-associated-with-the-first-phase-of-glucose-stimulated-insulin-secretion-function-of-%C3%AE-cell
#17
J Wu, H Wei, H Qu, Z Feng, J Long, Q Ge, H Deng
PURPOSE: To detect plasma vascular endothelial growth factor B (VEGF-B) in individuals with different glucose tolerance and investigate the relationship between plasma VEGF-B levels and the first phase of glucose-stimulated insulin secretion. METHODS: A cross-sectional study was conducted involving 45 patients with newly diagnosed type 2 diabetes mellitus (T2DM), 37 patients with impaired glucose regulation (IGR), and 39 Normal glucose tolerance (NGT) subjects, all of whom underwent intravenous glucose tolerance test...
May 18, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28522395/non-covalent-interaction-between-ferulic-acid-and-arabinan-rich-pectic-polysaccharide-from-rapeseed-meal
#18
Dongxian Zhang, Jianfei Zhu, Fayin Ye, Guohua Zhao
The sorption capacity of arabinan-rich pectic polysaccharide (ARPP) onto ferulic acid (FA) was investigated using equilibrium dialysis assays. UV and FT-IR spectra showed that FA was successfully adsorbed by ARPP. The effects of temperature, pH, buffer concentration, NaCl, and ethanol on sorption were investigated. Sorption variable optimization was examined by response surface methodology. The order of influence of each factor in affecting the sorption capacity was temperature>pH>buffer concentration...
May 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28521988/enhanced-solubility-and-antioxidant-activity-of-chlorogenic-acid-chitosan-conjugates-due-to-the-conjugation-of-chitosan-with-chlorogenic-acid
#19
Liyun Rui, Minhao Xie, Bing Hu, Li Zhou, Muhammad Saeeduddin, Xiaoxiong Zeng
Chlorogenic acid-chitosan conjugate was synthesized by introducing of chlorogenic acid onto chitosan with the aid of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and hydroxybenzotriazole. The data of UV-vis, FT-IR and NMR for chlorogenic acid-chitosan conjugates demonstrated the successful conjugation of chlorogenic acid with chitosan. Compared to chitosan, chlorogenic acid-chitosan conjugates exhibited increased solubility in distilled water, 1% acetic acid solution (v/v) or 50% ethanol solution (v/v) containing 0...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521976/facile-synthesis-of-cellulose-derivatives-based-on-cellulose-acetoacetate
#20
Hongchen Liu, Liduo Rong, Bijia Wang, Zhiping Mao, Ruyi Xie, Hong Xu, Linping Zhang, Yi Zhong, Xiaofeng Sui
In the present work, cellulose acetoacetates (CAA) was used as a precursor for preparing diversely functionalized cellulose derivatives. Four amino-bearing compounds, namely hexylamine (HA), l-glutamic acid (Glu), cysteine (Cys), and tyramine (TA) were reacted with acetoacetyl groups providing alkyl-, carboxyl-, thiol-, or phenolic functionalized cellulose. The reaction was conducted under mild conditions without catalysts and UV light. The products were characterized with FT-IR, NMR and solubility measurement...
August 15, 2017: Carbohydrate Polymers
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