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https://www.readbyqxmd.com/read/28738619/simultaneous-and-sensitive-electrochemical-detection-of-dihydroxybenzene-isomers-with-uio-66-metal-organic-framework-mesoporous-carbon
#1
Min Deng, Shourui Lin, Xiangjie Bo, Liping Guo
The zirconium-based MOF (UiO-66)/mesoporous carbon (MC) composite was synthesized using conventional hydrothermal method for the first time. The surface morphology and structure of UiO-66/MC composite were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). A novel electrochemical sensor based on UiO-66/MC was constructed for simultaneous and sensitive determination of dihydroxybenzene isomers (DBIs) of hydroquinone (HQ), catechol (CT) and resorcinol (RS)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738585/ordered-mesoporous-silica-film-as-a-novel-fiber-coating-for-solid-phase-microextraction
#2
Hui Jiang, Jiansheng Li, Xingru Hu, Jinyou Shen, Xiuyun Sun, Weiqing Han, Lianjun Wang
Ordered mesoporous silica (OMS) film supported on anodized titanium wire was fabricated as a new solid phase microextraction (SPME) fiber for the extraction of chlorophenols (CPs) from aqueous media followed by the determination with gas chromatography flame ionization detection (GC-FID). The supported OMS film was prepared via a solvent evaporation-induced self-assembly approach (EISA) combined with dip-coating technology. Commonly used fragile fused silica fiber was replaced by anodized titanium wire. The coating materials were characterized by N2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738425/preparation-and-characterization-of-pegylated-iron-oxide-gold-nanoparticles-for-delivery-of-sulforaphane-and-curcumin
#3
Hossein Danafar, Ali Sharafi, Sonia Askarlou, Hamidreza Kheiri Manjili
Natural products have been used for the treatment of various diseases such as cancer. Curcumin (CUR) and sulforaphane (SF) have anti-cancer effects, but their application is restricted because of their low water solubility and poor oral bioavailability. To improve the bioavailability and solubility of SF and CUR, we performed an advanced delivery of SF and CUR with PEGylated gold coated Fe3O4 magnetic nanoparticles (PEGylated Fe3O4@Au NPs) to endorse SF and CUR maintenance as an effective and promising antitumor drugs...
July 24, 2017: Drug Research
https://www.readbyqxmd.com/read/28737713/quality-assessment-of-gentiana-rigescens-from-different-geographical-origins-using-ft-ir-spectroscopy-combined-with-hplc
#4
Zhe Wu, Yanli Zhao, Ji Zhang, Yuanzhong Wang
Gentiana rigescens is a precious herbal medicine in China because of its liver-protective and choleretic effects. A method for the qualitative identification and quantitative evaluation of G. rigescens from Yunnan Province, China, has been developed employing Fourier transform infrared (FT-IR) spectroscopy and high performance liquid chromatography (HPLC) with the aid of chemometrics such as partial least squares discriminant analysis (PLS-DA) and support vector machines (SVM) regression. Our results indicated that PLS-DA model could efficiently discriminate G...
July 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28736379/-preparation-of-nanoparticles-for-sustained-insulin-release-using-poly-ethylene-glycol-poly-%C3%AE%C2%B5-caprolactone-poly-n-n-diethylamino-2-ethylmethaerylate
#5
Lei Wu, Wen-Ting Zhu, Jun Wang, Jie Liu, Qing-Bing Zeng
OBJECTIVE: To prepare an insulin-loaded nanoparticle assembled using pH-sensitive poly(ethylene glycol)-poly(ε-caprolactone)-poly(N,N-diethylamino-2-ethylmethaerylate) (mPEG-PCL-PDEAEMA) and investigate its performance of sustained insulin release in vitro and its hypoglycemic effects in diabetic rats. METHDOS: mPEG-PCL-PDEAEMA triblock copolymers with different hydrophobic lengths were synthesized by ring opening polymerization (ROP) combined with atom transfer radical polymerization (ATRP)...
July 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28733004/study-on-thermal-mechanical-and-adsorption-properties-of-amine-functionalized-mcm-41-pmma-and-mcm-41-ps-nanocomposites-prepared-by-ultrasonic-irradiation
#6
Gholamhossein Mohammadnezhad, Saeed Abad, Roozbeh Soltani, Mohammad Dinari
In this study, two common industrial polymers, poly(methyl methacrylate) (PMMA) and polystyrene (PS), were incorporated into amine-functionalized MCM-41 mesoporous silica as reinforcement agents via an ultrasonic assisted method as a facile, fast, eco-friendly, and versatile synthetic tool. Amino functionalization of MCM-41 were performed by 3-aminopropyl triethoxysilane as a coupling agent and it is denoted as APTS-MCM-41. The obtained nanocomposites (NCs), APTS-MCM-41/PMMA and APTS-MCM-41/PS, were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), and thermogravimetric analysis (TGA)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732994/sonocatalytic-degradation-of-methylene-blue-by-a-novel-graphene-quantum-dots-anchored-cdse-nanocatalyst
#7
Saeed Sajjadi, Alireza Khataee, Mehdi Kamali
Cadmium selenide/graphene quantum dots (CdSe/GQDs) nanocatalyst with small band gap energy and a large specific surface area was produced via a facile three-step sonochemical-hydrothermal process. The features of the as-prepared CdSe, GQDs and CdSe/GQDs samples were characterized by photoluminescence spectroscopy (PL), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), Fourier transformed infrared (FT-IR), diffuse-reflectance spectrophotometer (DRS), and Brunauer-Emmett-Teller (BET) analysis...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732957/sonochemical-synthesis-of-silver-nanoparticles-anchored-reduced-graphene-oxide-nanosheets-for-selective-and-sensitive-detection-of-glutathione
#8
Victor Vinoth, Jerry J Wu, Abdullah M Asiri, Sambandam Anandan
Developed here an eco-friendly, one-pot approach toward rapid synthesis of silver nanoparticles anchored reduced graphene oxide (AgNPs(TMSPED)-rGO) nanosheets via sonochemical irradiation method, using an aqueous solution mixture of GO and AgNO3 in the presence of N-[3(trimethoxysilyl)propyl] ethylenediamine (TMSPED) without any reducing agent. As synthesized decorated nanosheets was thoroughly characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732955/kinetic-modeling-of-sonocatalytic-performance-of-gd-doped-cdse-nanoparticles-for-degradation-of-acid-blue-5
#9
Alireza Khataee, Atefeh Karimi, Aliyeh Hasanzadeh, Sang Woo Joo
CdSe and Gd-doped CdSe nanoparticles were synthesized using a simple hydrothermal method, and their catalytic activity was examined toward degradation of Acid Blue 5 (AB5) in the sonocatalytic process. The structure and morphology of as-prepared nanomaterials were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Branauer, Emmett and Teller (BET) and Fourier infrared spectroscopy (FT-IR) techniques...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732933/ultrasonic-assisted-synthesis-of-nanocomposite-materials-based-on-resole-resin-and-surface-modified-nano-ceo2-chemical-and-morphological-aspects
#10
Mehdi Hatami, Mohammadreza Yazdan Panah
In this study, phenol-formaldehyde (PF)/CeO2 nanocomposites (NC)s were prepared by in-situ polymerization of phenol and formaldehyde in alkali solution in the presence of surface modified CeO2 nanoparticles (NP)s by sonochemical assisted synthesis. The morphology and structure of PF/CeO2 NCs were characterized by using fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and thermal analyses methods. It was found that due to the good dispersion of surface modified NPs in polymer matrix and the strong interfacial interaction between the CeO2 NPs and PF matrix, the thermal stability and thermo-mechanical properties of the PF/CeO2 NCs were greatly enhanced...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732924/ultrasonic-irradiation-enhanced-the-ability-of-fluorescein-da-fe-iii-on-sonodynamic-and-sonocatalytic-damages-of-dna-molecules
#11
Qiong Wu, Xia Chen, Lizhen Jia, Yi Wang, Ying Sun, Xingjun Huang, Yuxiang Shen, Jun Wang
The interaction of DNA with Bis [N,N-bis (carboxymethyl) aminomethyl] fluorescein-Ferrous(III) (Fluorescein-DA-Fe(III)) with dual functional (sonodynamic and sonocatalytic) activity was studied by UV-vis spectroscopy, fluorescence spectroscopy, FT-IR spectroscopy, circular dichroism (CD) spectroscopy and viscosity measurements. And then, the damage of DNA caused by Fluorescein-DA-Fe(III) under ultrasonic irradiation (US) was researched by agarose gel electrophoresis and cytotoxicity assay. Meanwhile, some influenced factors such as ultrasonic irradiation time and Fluorescein-DA-Fe(III) concentration on the damage degree of DNA molecules were also examined...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732909/optimization-synthesis-and-characterization-of-coaxial-electrospun-sodium-carboxymethyl-cellulose-graft-methyl-acrylate-poly-ethylene-oxide-nanofibers-for-potential-drug-delivery-applications
#12
Akbar Esmaeili, Mahsa Haseli
In this study, nanofiber drug carriers were fabricated via coaxial electrospinning, using a new, degradable core-shell nanofiber drug carrier fabricated via coaxial electrospinning. Fabrication of the shell was carried out by graft polymerization of sodium carboxymethyl cellulose (NaCMC) with methyl acrylate (TCMC) and poly(ethylene oxide) (PEO). Tetracycline hydrochloride (TCH) was used as a drug model incorporated within the nanofibers as the core, and their performance as a drug carrier scaffold was evaluated...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732898/facile-approach-to-the-fabrication-of-3d-cellulose-nanofibrils-cnfs-reinforced-poly-vinyl-alcohol-hydrogel-with-ideal-biocompatibility
#13
Xiao Chen, Chuntao Chen, Heng Zhang, Yang Huang, Jiazhi Yang, Dongping Sun
In this study, the reinforcing effects of cellulose nanofibrils (CNFs) on poly (vinyl alcohol) (PVA) matrix were explored. And ethylene glycol was used to enhance the water content and phosphate buffer saline (PBS) absorbency. The morphological aspects of the hydrogel were studied by transmission electron microscope (TEM) and scanning electron microscopy (SEM). The presence of interactions, changes in crystallinity as well as thermal behaviour were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermogravimetry respectively...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732869/in-situ-formation-of-supramolecular-aggregates-between-chitin-nanofibers-and-silver-nanoparticles
#14
Ruchira N Wijesena, Nadeeka D Tissera, Charith Abeyratne, Osura M Bangamuwa, Natalie Ludowyke, Damayanthi Dahanayake, Sunanda Gunasekara, Nuwan de Silva, Rohini M de Silva, K M Nalin de Silva
Chitin and chitin derivatives have gained significant research interest over the years due to a number of beneficial properties that can be exploited in various application fields. Particularly, interactions between their nanostructures and other nanomaterials are of great interest. In situ photo-reduction of AgCl in chitin nanofiber aqueous dispersions resulted in significant loss of colloidal stability of both chitin nanofibers (CNF) and silver nanoparticles. UV-vis spectroscopy was used to characterize the extinction profiles of in-situ prepared CNF and several silver nanoparticle mixtures over the reaction steps...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732734/uv-protection-and-antibacterial-properties-of-seaweed-capped-zno-nanoparticles-coated-cotton-fabrics
#15
R Pandimurugan, S Thambidurai
Seaweed capped zinc oxide nanoparticles (SW-ZnO NPs) were prepared by simple chemical precipitation method of zinc nitrate in the presence of seaweed. The synthesised SW-ZnO NPs were characterised by FT-IR, UV-Visible spectroscopy, XRD and BET analysis. These metal oxides were coated on cotton fabric using pad dry cure technique. The SW-ZnO NPs coated cotton fabrics, the surface morphology and chemical composition was analysed by HR-SEM with EDAX. The antibacterial activity of uncoated cotton, seaweed extract and SW-ZnO NPs coated cotton fabrics were investigated against Gram positive (S...
July 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28730362/removal-of-cr-vi-from-aqueous-solution-using-electrosynthesized-4-amino-3-hydroxynaphthalene-1-sulfonic-acid-doped-polypyrrole-as-adsorbent
#16
Mohamed Lamine Sall, Abdou Karim Diagne Diaw, Diariatou Gningue-Sall, Alexandre Chevillot-Biraud, Nihal Oturan, Mehmet Ali Oturan, Jean-Jacques Aaron
Polypyrrole (PPy) conducting films, doped with 4-amino-3-hydroxynaphthalene sulfonic acid (AHNSA), were electrosynthesized by anodic oxidation of pyrrole on Pt and steel electrodes in aqueous medium (0.01 M AHNSA +0.007 M NaOH, using cyclic voltammetry (CV), and their electrochemical properties were studied. Fourier-transform infrared (FT-IR) spectroscopy confirmed the formation of AHNSA-PPy films. Their morphology was characterized by scanning electron microscopy (SEM), and their optical properties, including UV-VIS absorption and fluorescence spectra, were also investigated...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28730357/biosynthesis-of-silver-nanoparticles-from-spirulina-microalgae-and-its-antibacterial-activity
#17
Govarthanan Muthusamy, Selvankumar Thangasamy, Mythili Raja, Sudhakar Chinnappan, Selvam Kandasamy
The present work focuses on a low-cost, simple, and green synthesis of silver nanoparticles (AgNPs) by mixing AgNO3 solution with the extract of Spirulina platensis (SP) without any chemical reducing and/or capping agents. The green synthesis of AgNPs was confirmed by the color change from colorless to yellowish brown. The biosynthesis of AgNPs was further confirmed by UV-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), biological transmission electron microscopy (Bio-TEM), and energy dispersive X-ray analysis (EDX)...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28728087/surface-imprinted-bacterial-cellulose-nanofibers-for-hemoglobin-purification
#18
Monireh Bakhshpour, Emel Tamahkar, Müge Andaç, Adil Denizli
There is a significant need for the development of the novel adsorbents in the field of protein purification. In this study, thin hemoglobin imprinted film (MIP) was fabricated onto the bacterial cellulose nanofibers' (BCNFs) by surface imprinting method using metal ion coordination interactions with N-methacryloyl-(L)-histidinemethylester (MAH) and copper ions. The hemoglobin surface imprinted bacterial cellulose nanofibers (MIP-BCNFs) was applied to selective recognition of hemoglobin and purification from hemolysate...
July 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28727045/technical-note-characterization-of-lipid-constitution-in-fourier-transform-infrared-spectra-and-spectroscopic-discrimination-of-animal-derived-feedstuffs-from-different-species
#19
F Gao, L Han, Z Yang, L Xu, X Liu
The objective of the current work was to assess the capability of Fourier transform infrared (FT-IR) spectroscopy in combination with chemometric methods to discriminate animal-derived feedstuffs from different origins based on the lipid characteristics. A total of 82 lipid samples extracted from animal-derived feedstuffs, comprising porcine, poultry, bovine, ovine, and fish samples, were investigated by gas chromatography and FT-IR. The relationship between the lipid constitutions and the responding FT-IR spectral characteristics were explored...
June 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28725868/physico-mechanical-thermal-and-morphological-properties-of-furfuryl-alcohol-2-ethylhexyl-methacrylate-halloysite-nanoclay-wood-polymer-nanocomposites-wpncs
#20
Md Rezaur Rahman, Sinin Hamdan, Josephine Chang Hui Lai, Mohammad Jawaid, Fahmi Asyadi Bin Md Yusof
In this study, the physical, morphological, mechanical and thermal properties of furfuryl alcohol/2-ethylhexyl methacrylate/halloysite nanoclay wood polymer nanocomposites (FA-co-EHMA-HNC WPNCs) were investigated. FA-co-EHMA-HNC WPNCs were prepared via an impregnation method and the properties of the nanocomposites were characterized through the weight percent gain, Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), three-point flexural test, dynamic mechanical thermal analysis (DMTA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) analysis and moisture absorption test...
July 2017: Heliyon
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