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https://www.readbyqxmd.com/read/28925715/novel-carbon-dots-derived-from-schizonepetae-herba-carbonisata-and-investigation-of-their-haemostatic-efficacy
#1
Meiling Zhang, Yan Zhao, Jinjun Cheng, Xiaoman Liu, Yongzhi Wang, Xin Yan, Yue Zhang, Fang Lu, Qingguo Wang, Huihua Qu
Schizonepetae Herba Carbonisata (SHC) has been used in traditional Chinese medicine (TCM) to treat haemorrhagic diseases for more than 1000 years. However, little information is available on its haemostatic components and mechanism. In this study, we developed novel water-soluble carbon dots (CDs) in aqueous extracts of SHC for the first time and a modified pyrolysis method was used to prepare the SHC using Schizonepetae Herba (SH) as the sole precursor. The SHC-CDs were characterized using transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis) and fluorescence spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and high-performance liquid chromatography (HPLC)...
September 19, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28923746/diphenyl-diselenide-immobilized-on-magnetic-nanoparticles-a-novel-and-retrievable-heterogeneous-catalyst-in-the-oxidation-of-aldehydes-under-mild-and-green-conditions
#2
Yalda Rangraz, Firouzeh Nemati, Ali Elhampour
In the present study diselenide stabilized on silica coated Fe3O4 magnetic nano particles asa novel, highly efficient and magnetically retrievable heterogeneous catalyst was designed, synthesized and introduced. Full characterization of the newly prepared magnetic nanocatalyst was authenticated using several physico-chemical characterization techniques such as Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction patterns (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM)...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28923384/synthesis-and-structure-elucidation-of-novel-salophen-based-dioxo-uranium-vi-complexes-in-vitro-and-in-silico-studies-of-their-dna-bsa-binding-properties-and-anticancer-activity
#3
S Yousef Ebrahimipour, Maryam Mohamadi, Masoud Torkzadeh Mahani, Jim Simpson, Joel T Mague, Iran Sheikhshoaei
The synthesis and characterization of three dioxo U(VI) complexes, [UO2(L(1))(OH2)], [UO2(L(2))DMF], and [UO2(L(2))DMSO], [L(1)](2-) = 1,1'-(4-methyl-1,2-phenylenebis (nitrilomethylidyne))di-2-naphtholate: [L(2)](2-) = 1,1'-(o-phenylenebis (nitrilomethylidyne)) di-2-naphtholate, are reported. Elemental analysis, FT-IR, (1)HNMR, UV-Vis spectroscopy, molar conductivity and single crystal X-ray diffraction were used to characterize the complexes. It was found that the complexes adopt a distorted pentagonal bipyramidal coordination geometry...
September 4, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28921736/graphene-oxide-go-as-stabilizer-for-preparing-chirally-helical-polyacetylene-go-hybrid-microspheres-via-suspension-polymerization
#4
Jun Li, Jinrui Deng, Weifei Li, Kai Pan, Jianping Deng
Hybrid materials consisting of polymers and graphene are gathering ever-growing interest. This article reports a novel methodology for preparing chirally helical polyacetylene/graphene hybrid microspheres (MPs) via suspension polymerization in which graphene oxide (GO) or alkynylated GO (MGO) serves as a sole stabilizer. Such polymerizations show remarkable advantages in circumventing the difficulties in usual suspension polymerizations and especially in directly providing clean hybrid MPs. Scanning electron microscopy (SEM), Raman spectra, and electron dispersive spectroscopy indicate that graphene sheets cover the MPs through physical interaction (GO) or covalent bonds (MGO)...
September 15, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28918640/supramolecular-interaction-assisted-fluorescence-and-tunable-stimuli-responsiveness-of-l-phenylalanine-based-polymers
#5
Mridula Nandi, Binoy Maiti, Kambalapalli Srikanth, Priyadarsi De
Supramolecular host-guest interaction between randomly methylated β-cyclodextrin (RM β-CD) and side-chain phenylalanine (Phe) and Phe-Phe dipeptide based homopolymers has been employed for amplification of fluorescence emission of otherwise weakly fluorescent amino acid Phe. The host-guest complex has been characterized by 1H and 13C NMR spectroscopy, two-dimensional (2D) rotating-frame overhauser spectroscopy (ROESY), FT-IR, UV-visible and fluorescence spectroscopy. To gain insights into the origin of fluorescence in homopolymers, density functional theory (DFT) calculations were performed where phenyl moieties inside the less polar core of β-CD were observed to form π-π coupled complex resulting in enhanced emission...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28918375/synthesis-of-fluorescent-dendrimers-with-aggregation-induced-emission-features-through-a-one-pot-multi-component-reaction-and-their-utilization-for-biological-imaging
#6
Weihua Luo, Ruming Jiang, Meiying Liu, Qing Wan, Jianwen Tian, Yuanqing Wen, Qian-Yong Cao, Junfeng Hui, Xiaoyong Zhang, Yen Wei
Hyperbranched polymers have attracted wide research attention owing to their unique topological structure, physicochemical properties and great potential for applications such asadditives, drug delivery, catalysts and nanotechnology. Among these, the polyamidoamine(PAMAM) dendrimers are some of the most important dendrimers. However, the synthesis and biomedical applications of fluorescent PAMAM dendrimers have received only limited attention. In this work, we present a rather effective and convenient approach for synthesis of fluorescent PAMAM dendrimers with aggregation-induced emission (AIE) properties through a one-pot catalyst-free Mannich reaction under rather mild experimental conditions (e...
September 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918373/defect-free-surface-modification-methods-for-solubility-tunable-carbon-nanotubes
#7
Hee Dae Lee, Byung Min Yoo, Tae Hoon Lee, Ho Bum Park
Although carbon nanotubes (CNTs) have outstanding physical properties, there are still challenging issues such as poor dispersibility and miscibility between organic polymers and CNTs for polymer nanocomposites. Chemical modifications (e.g., strong acid based oxidation, carboxylation, etc.) can improve dispersion properties and compatibility, but such surface modification methods often lead to damage to the pristine CNT structure and also deteriorate the mechanical properties of CNTs. Here we demonstrate a simple, defect-free and scalable method for well-dispersed CNTs in common organic solvents, using dopamine and amine-terminated polyethylene glycol derivatives...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918149/predicting-methane-emissions-of-lactating-danish-holstein-cows-using-fourier-transform-mid-infrared-spectroscopy-of-milk
#8
N Shetty, G Difford, J Lassen, P Løvendahl, A J Buitenhuis
Enteric methane (CH4), a potent greenhouse gas, is among the main targets of mitigation practices for the dairy industry. A measurement technique that is rapid, inexpensive, easy to use, and applicable at the population level is desired to estimate CH4 emission from dairy cows. In the present study, feasibility of milk Fourier transform mid-infrared (FT-IR) spectral profiles as a predictor for CH4:CO2 ratio and CH4 production (L/d) is explained. The partial least squares regression method was used to develop the prediction models...
September 13, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28917930/structural-characterization-and-rheological-behavior-of-a-heteroxylan-extracted-from-plantago-notata-lagasca-plantaginaceae-seeds
#9
Fatima Benaoun, Cédric Delattre, Zakaria Boual, Alina V Ursu, Christophe Vial, Christine Gardarin, Anne Wadouachi, Didier Le Cerf, Tony Varacavoudin, Mohamed Didi Ould El-Hadj, Philippe Michaud, Guillaume Pierre
Plantago notata (Plantaginaceae) is a spontaneous plant from Septentrional Algerian Sahara currently used by traditional healers to treat stomach disorders, inflammations or wound healing. A water-soluble polysaccharide, called PSPN (PolySaccharide fraction from Plantago Notata), was extracted and purified from the seeds of this semi-arid plant. The structural features of this mucilage were evaluated by colorimetric assays, Fourier transformed infrared spectroscopy (FT-IR), gas chromatography coupled to mass spectrometry (GC/MS) and (1)H/(13)C Nuclear Magnetic Resonance (NMR) spectroscopy...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917918/chitosan-composite-hydrogels-reinforced-with-natural-clay-nanotubes
#10
Biao Huang, Mingxian Liu, Changren Zhou
Here, chitosan composites hydrogels were prepared by addition of halloysite nanotubes (HNTs) in the chitosan KOH/LiOH/urea solution. The raw chitosan and chitosan/HNTs composite hydrogels were obtained by heat treatment at 60°C for 8h and then regeneration in ethanol solution. The viscosity of the composite solution is increased with HNTs content. The Fourier transform infrared spectroscopy (FT-IR) shows that the hydrogen bonds interactions exist between the HNTs and the chitosan. X-ray diffraction (XRD) results show that the crystal structure of HNT is not changed in the composite hydrogels...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917902/an-unexpected-reactivity-during-periodate-oxidation-of-chitosan-and-the-affinity-of-its-2-3-di-aldehyde-toward-sulfa-drugs
#11
Sherif M A S Keshk, Ahmed M Ramadan, Abdullah G Al-Sehemi, Ahmad Irfan, Samir Bondock
In an attempt to determine the reactivity during the periodate oxidation of the vicinal amino sugar, chitosan was oxidized by KIO4 in a neutral medium. The reactivity was unexpectedly found to be low. The formation of di-aldehyde chitosan (DACT) might cause the low reactivity of chitosan oxidation. Therefore, density functional theory (DFT) calculations were carried out, which revealed that the greater stability of the cyclic amino iodate intermediate might retard the ring opening to form DACT. Furthermore, the affinity of the formation of two novel Schiff bases from the interaction of delivered DACT with two sulfa drugs [sulfanilamide and sulfathiazole] was also investigated using aldehyde content estimation...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917893/carboxymethyl-cyclosophoraoses-as-a-flexible-ph-responsive-solubilizer-for-pindolol
#12
Yiluo Hu, Hwanhee Kim, Vijay Vilas Shinde, Daham Jeong, Youngjin Choi, Eunae Cho, Seunho Jung
In the present study, cyclosophoraoses (CyS) (β-1,2 linked cyclic glucans, with glucopyranose units ranging from 17 to 23) isolated from Rhizobium leguminosarum biovar viciae VF-39 were modified with carboxymethyl (CM) groups, and the pH-sensitive complexation of CM CyS with pindolol was investigated. The solubility of pindolol increased 32-fold by its complexation with 5mM CM CyS at pH 10, whereas it shows no significant change at pH 3. Pindolol, a β-adrenergic blocking agent, has a hydrophobic nature at non-ionized state, and CM CyS could solubilize efficiently pindolol in a high alkaline solution...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917883/green-cellulose-based-nanocomposite-catalyst-design-and-facile-performance-in-aqueous-synthesis-of-pyranopyrimidines-and-pyrazolopyranopyrimidines
#13
Ali Maleki, Abbas Ali Jafari, Somayeh Yousefi
A cellulose-based nanobiocomposite decorated with Fe3O4 nanoparticles was prepared, characterized and applied as an easily recoverable and reusable green nanocatalyst in the synthesis of pyrano[2,3-d]pyrimidine derivatives in water at room temperature. The characterization was performed by using a variety of conventional analytical instruments such as Fourier transform infrared spectra (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), vibrating sample magnetometer (VSM), thermal analysis (TGA/DTA) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) analyses...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917786/chemometric-compositional-analysis-of-phenolic-compounds-in-fermenting-samples-and-wines-using-different-infrared-spectroscopy-techniques
#14
Jose Luis Aleixandre-Tudo, Helene Nieuwoudt, Jose Luis Aleixandre, Wessel du Toit
The wine industry requires reliable methods for the quantification of phenolic compounds during the winemaking process. Infrared spectroscopy appears as a suitable technique for process control and monitoring. The ability of Fourier transform near infrared (FT-NIR), attenuated total reflectance mid infrared (ATR-MIR) and Fourier transform infrared (FT-IR) spectroscopies to predict compositional phenolic levels during red wine fermentation and aging was investigated. Prediction models containing a large number of samples collected over two vintages from several industrial fermenting tanks as well as wine samples covering a varying number of vintages were validated...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917761/graphene-nanoribbon-fept-bimetallic-nanoparticles-uric-acid-as-a-novel-magnetic-sensing-layer-of-screen-printed-electrode-for-sensitive-determination-of-ampyra
#15
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Salimeh Amidi, Tayyebeh Madrakian
A novel electrochemical sensor for sensitive determination of ampyra (Am) based on graphene nanoribbons modified by iron-platinum bimetallic nanoparticles and uric acid (SPCE/FePtGNR/UA) dropped on the screen-printed carbon electrode (SPCE) surface and magnetically captured onto an SPCE working electrode surface is reported in the present work. The modified nanocomposite and sensing layer was characterized by different techniques, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray powdered diffraction (XRD)...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917502/fluorescence-and-magnetic-nanocomposite-fe3o4-sio2-au-mnps-as-peroxidase-mimetics-for-glucose-detection
#16
Shajie Luo, Yaqin Liu, Hanbing Rao, Yanying Wang, Xianxiang Wang
In this paper, multifunction nanoparticles (MNPs), Fe3O4@SiO2@Au MNPs, with properties of superparamagnetism, fluorescence and peroxidase-like catalytic activity were synthesized in the aqueous phase. The synthesized composites were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), powder diffraction (XRD), Fourier translation infrared spectrum (FT-IR) and fluorometer. The results show that the multifunctional nanomaterials have good magnetic and fluorescence properties...
September 13, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28914059/physiochemical-characteristics-and-molecular-structures-for-digestible-carbohydrates-of-silages
#17
Basim Refat, Luciana Louzada Prates, Yaogeng Lei, David Christensen, John J McKinnon, Peiqiang Yu
The main objectives of this study were (1) to assess the magnitude of differences among new barley silage varieties (BS) selected for varying rates of in vitro NDFD digestibility (ivNDFD; Cowboy BS with higher ivNDFD , Copeland BS with intermediate ivNDFD and Xena BS with lower ivNDFD) as regards to their physiochemical features (energy), carbohydrate nutrient fractions and rumen digestive contents in dairy cows in comparison with a new corn silage hybrid (Pioneer 7213R), and (2) to identify the pattern of interactive association between the molecular structure of carbohydrates and digestible carbohydrates content...
September 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28912866/compositional-analysis-of-various-layers-of-upper-urinary-tract-stones-by-infrared-spectroscopy
#18
Zhang He, Zhang Jing, Zheng Jing-Cun, Hu Chuan-Yi, Gao Fei
The objective of the present study was to determine the composition of various layers of upper urinary stones and assess the mechanisms of stone nucleation and aggregation. A total of 40 integrated urinary tract stones with a diameter of >0.8 cm were removed from the patients. All of the stones were cut in half perpendicularly to the longitudinal axis. Samples were selected from nuclear, internal and external layers of each stone. Fourier transform infrared spectroscopy (FT-IR) was adopted for qualitative and quantitative analysis of all of the fragments and compositional differences among nuclear, internal and external layers of various types of stone were subsequently investigated...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28911818/anti-fatigue-activity-of-a-lachnum-polysaccharide-and-its-carboxymethylated-derivative-in-mice
#19
Maheen Mahwish Surhio, Yufen Wang, Shi Fang, Jinglei Li, Ming Ye
The present study was designed to evaluate the anti-fatigue activity of an exopolysaccharide LEP-1b and its carboxymethylated derivative CLEP-1b from a Lachnum sp. Carboxymethylation was confirmed through FT-IR and (13)C NMR spectroscopies, which showed that the (-CH2COOH) group was attached to an oxygen (O) atom of the hydroxyl group on (C-3) of LEP-1b. Each treatment group LEP-1b and CLEP-1b at doses (50, 100, 200mg/kg, respectively) ameliorated physical fatigue and extended exhaustive swimming time in mice...
July 13, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28902506/non-invasive-synchrotron-based-x-ray-raman-scattering-discriminates-carbonaceous-compounds-in-ancient-and-historical-materials
#20
Pierre Gueriau, Jean-Pascal Rueff, Sylvain Bernard, Josiane Albert Kaddissy, Sarah Goler, Christoph J Sahle, Dimosthenis Sokaras, Roy A Wogelius, Philip L Manning, Uwe Bergmann, Loïc Bertrand
Carbon compounds are ubiquitous and occur in a diversity of chemical forms in many systems including ancient and historic materials ranging from cultural heritage to paleontology. Determining their speciation cannot only provide unique information on their origin, but may also elucidate degradation processes. Synchrotron-based X-ray absorption near-edge structure (XANES) spectroscopy at the carbon K-edge (280-350 eV) is a very powerful method to probe carbon speciation. However, the short penetration depth of soft X-rays imposes stringent constraints on sample type, preparation and analytical environment...
September 13, 2017: Analytical Chemistry
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