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https://www.readbyqxmd.com/read/29677610/a-new-electrochemical-sensor-for-highly-sensitive-and-selective-detection-of-nitrite-in-food-samples-based-on-sonochemical-synthesized-calcium-ferrite-cafe-2-o-4-clusters-modified-screen-printed-carbon-electrode
#1
Paramasivam Balasubramanian, Ramki Settu, Shen-Ming Chen, Tse-Wei Chen, Ganapathi Sharmila
Herein, we report a novel, disposable electrochemical sensor for the detection of nitrite ions in food samples based on the sonochemical synthesized orthorhombic CaFe2 O4 (CFO) clusters modified screen printed electrode. As synthesized CFO clusters were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and amperometry (i-t)...
April 11, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29675828/effect-of-prenatal-diagnosis-on-hospital-costs-in-complete-transposition-of-the-great-arteries
#2
Dipankar Gupta, Meredith E Mowitz, Dalia Lopez-Colon, Connie S Nixon, Himesh V Vyas, Jennifer G Co-Vu
OBJECTIVE: Prenatal diagnosis of congenital heart disease (CHD) is associated with improved clinical outcomes, yet its impact on the cost of hospitalization is not well described. We hypothesized that prenatal diagnosis of complete transposition of the great arteries (d-TGA) results in lower total hospital costs compared to postnatal diagnosis. METHODS: Retrospective analysis of infants with d-TGA repaired at our center from July 2006- 2014. Total charges from initial hospitalization until discharge were converted to costs using the cost-to-charge ratio, and then converted into 2016 dollars using the Consumer Price Index...
April 19, 2018: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29674097/effect-of-various-electrokinetic-treatment-regimes-on-solids-surface-properties-and-thermal-behavior-of-oil-sediments
#3
Esmaeel Kariminezhad, Maria Elektorowicz
The electrokinetic process has shown its ability to separate the different material phases. However, not much is known about the effect of the electric fields on the surface properties of solids in the oil sediments and their behavior under different electrical regimes. In this study, the effect of four different types of electrical current on the surface properties of oil sediments was investigated, namely constant direct current (CDC), pulsed direct current (PDC), incremental direct current (IDC) and decremental direct current (DDC)...
April 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29673958/binary-grafted-chitosan-film-synthesis-characterization-antibacterial-activity-and-prospects-for-food-packaging
#4
Deepak Kumar, Pramendra Kumar, Jyoti Pandey
The antimicrobial binary grafted chitosan film [chit-g-Poly (An-co-Am)] was prepared by grafting of acrylonitrile and acrylamide on to chitosan via microwave initiated graft copolymerization. The grafting of acrylonitrile and acrylamide onto chitosan backbone was confirmed by FTIR, XRD, SEM and TGA/DTA/DTG analytical techniques. The binary grafted chitosan film possessed efficient antimicrobial activity against three tested strains, i.e. Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The prepared binary grafted chitosan film was tested for packaging apple and guava to prevent microbial infection and extend their shelf life...
April 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29670133/preparation-of-colourless-phosphate-glass-by-stabilising-higher-fe-ii-in-microwave-heating
#5
Ashis K Mandal, B Mandal, Kavya Illath, T G Ajithkumar, A Halder, P K Sinha, Ranjan Sen
Iron impurity in raw material remains a major challenge in producing colourless glass. In this investigation, we report microwave (MW) heating capable of altering Fe-redox ratio (Fe2+ /∑Fe) enabling preparation of colourless phosphate glass. The effect of Sn concentration in retention of Fe[II] in glass melted in MW was compared with conventional glasses. Colourimetric study developing Fe2+ -ferrozine colour complex reveals Fe-redox ratio ≥0.49 required to obtain colourless phosphate glass. In microwave heating, addition of 1 wt...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29670058/effective-conversion-of-amide-to-carboxylic-acid-on-polymers-of-intrinsic-microporosity-pim-1-with-nitrous-acid
#6
Wei-Hsuan Wu, Paul Thomas, Paul Hume, Jianyong Jin
Carboxylate-functionalised polymers of intrinsic microporosity (C-PIMs) are highly desirable materials for membrane separation applications. The recently reported method to afford C-PIMs was via an extensive base hydrolysis process requiring 360 h. Herein, a novel and effective method to convert PIM-CONH₂ to C-PIM using nitrous acid was studied. The chemical structure of C-PIM was characterised by ¹H NMR, 13 C NMR, FTIR, elemental analysis, UV-Vis, TGA and TGA-MS. Complete conversion from amide to carboxylic acid groups was confirmed...
April 18, 2018: Membranes
https://www.readbyqxmd.com/read/29669440/thrombin-generation-assay-detects-moderate-intensity-statin-induced-reduction-of-hypercoagulability-in-diabetes
#7
Hee Sue Park, Ja-Yoon Gu, Hyun Ju Yoo, Se Eun Han, Chan Ho Park, Young Il Kim, Il Sung Nam-Goong, Eun Sook Kim, Hyun Kyung Kim
Statins not only have a lipid-lowering effect but also reduce inflammation and have an antithrombotic effect. Since hypercoagulability assessed by thrombin generation assay (TGA) and increased formation of neutrophil extracellular traps (NET) were demonstrated in diabetes, we investigated whether statin therapy in diabetes modifies coagulation status and NET formation. Twenty-five consecutive patients with diabetes were recruited. Global coagulation assays (prothrombin time [PT], activated partial thromboplastin time [aPTT], and TGA) and NET markers (DNA-histone complex, cell-free DNA, and neutrophil elastase) were measured before and after 3-month moderate-intensity statin therapy...
January 1, 2018: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/29667533/the-use-of-metal-hydroxide-sludge-in-natura-and-calcined-for-the-adsorption-of-brilliant-blue-dye-in-aqueous-solution
#8
Ana Maria Salgueiro Baptisttella, Andressa Aziz Diniz Araújo, Matheus Caldas Barreto, Vivian Stumpf Madeira, Mauricio Alves da Motta Sobrinho
Industrial waste such as metal hydroxide sludge (in natura and calcined) from galvanic bath was evaluated as an adsorbent in the removal of brilliant blue synthetic dye (NB 180) in aqueous solution. The samples were characterised using X-ray fluorescence analysis (XRF), X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), infrared spectroscopy (FT - IR), as well as the specific surface area (BET) and the point of zero charge (pHZCP ). The effects of the conditions in relation to pH and adsorbent dosage were also investigated...
April 18, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29665534/effect-of-minerals-on-the-stability-of-biochar
#9
Yan Yang, Ke Sun, Lanfang Han, Jie Jin, Haoran Sun, Yu Yang, Baoshan Xing
The stability of biochar is a major determinant of its potential for carbon sequestration. In previous studies, the biochar stability was evaluated by analyzing the oxidation resistance property of biochar, for which, K2 Cr2 O7 /H2 O2 oxidation and thermogravimetric analysis (TGA) were widely used to measure the high oxidation resistance of biochars. In this study, rice straw (RI)- and swine manure (SW)-derived biochars produced at different heating treatment temperatures (HTTs) and their corresponding de-ashed biochars and iron-biochars were selected to investigate the effect of minerals on these biochars stability...
April 12, 2018: Chemosphere
https://www.readbyqxmd.com/read/29665486/a-kinetic-study-on-the-catalysis-of-kcl-k-2-so-4-and-k-2-co-3-during-oxy-biomass-combustion
#10
Shuanghui Deng, Xuebin Wang, Jiaye Zhang, Zihan Liu, Hrvoje Mikulčić, Milan Vujanović, Houzhang Tan, Neven Duić
Biomass combustion under the oxy-fuel conditions (Oxy-biomass combustion) is one of the approaches achieving negative CO2 emissions. KCl, K2 CO3 and K2 SO4 , as the major potassium species in biomass ash, can catalytically affect biomass combustion. In this paper, the catalysis of the representative potassium salts on oxy-biomass combustion was studied using a thermogravimetric analyzer (TGA). Effects of potassium salt types (KCl, K2 CO3 and K2 SO4 ), loading concentrations (0, 1, 3, 5, 8 wt%), replacing N2 by CO2 , and O2 concentrations (5, 20, 30 vol%) on the catalysis degree were discussed...
April 14, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29665390/synthesis-of-chitosan-derivative-graft-acrylic-acid-superabsorbent-polymers-and-its-application-as-water-retaining-agent
#11
Shixin Fang, Guangjian Wang, Pengcheng Li, Ronge Xing, Song Liu, Yukun Qin, Huahua Yu, Xiaolin Chen, Kecheng Li
A new superabsorbent polymer was synthesized using amino ethyl chitosan and an acrylic acid by a free radical polymerization. The chemical structure of the superabsorbent polymer was characterized using FTIR, TGA, XRD and solid-state 13 C NMR. The results revealed that the acrylic acid was successfully grafted onto the amino ethyl chitosan backbone. As revealed by SEM, a surface with homogeneous and interconnected pore structure was obtained. The influences of different factors (e.g., the initiator, cross-linker and monomer) on the water absorbency of the superabsorbent polymers were investigated...
April 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29665389/application-of-pectin%C3%A2-zinc-oxide-hybrid-nanocomposite-in-the-delivery-of-a-hydrophilic-drug-and-a-study-of-its-isotherm-kinetics-and-release-mechanism
#12
Arun K Kodoth, Vivek M Ghate, Shaila A Lewis, B Vishalakshi
Pectin-based gel and its nanocomposite with zinc oxide have been compared for their capacity to release Donepezil for the possible use as an implantable drug delivery platform for the treatment of Alzheimer's disease. Adsorption capacities of the samples were determined as a function of pH, temperatures, concentrations of the drug, and the mass of the adsorbent. The nanocomposite exhibited significant adsorption compared to the parent gel. Adsorption data for the nanocomposite system fits well with Langmuir model and followed pseudo-first order kinetics, while that of the parent polymeric system followed pseudo-second-order kinetics...
April 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29662861/global-hemostatic-assay-of-different-target-procoagulant-activities-of-factor-viii-and-factor-ix
#13
Ki-Young Yoo, Soo-Young Jung, Sung-Ho Hwang, Su-Min Lee, Jong-Ho Park, Hyun-Ja Nam
Background: Korean National Health Insurance reimburses factor VIII (FVIII) and factor IX (FIX) clotting factor concentrate (CFC) infusions to discrepant activity levels, allowing elevation of FVIII activity to 60 IU/dL and FIX to 40 IU/dL. We aimed to assess hemostatic response to these target levels using global hemostatic assays. Methods: We enrolled 34 normal healthy men, 34 patients with hemophilia A, and 36 with hemophilia B, with residual factor activity of 3 IU/dL or less and without inhibitors...
March 2018: Blood Research
https://www.readbyqxmd.com/read/29661324/adsorption-study-of-methyl-orange-by-chitosan-polyvinyl-alcohol-zeolite-electrospun-composite-nanofibrous-membrane
#14
Umma Habiba, Tawsif A Siddique, Jacky Jia Li Lee, Tan Chin Joo, Bee Chin Ang, Amalina M Afifi
The chitosan/polyvinyl Alcohol/zeolite electrospun composite nanofibrous membrane was fabricated for adsorption of methyl orange. The EDX, TGA and tensile test were carried out for the characterization of the membrane. The Young's Modulus of the nanofibrous membranes increased by more than 100% with the addition of zeolite to chitosan/PVA. The batch adsorption tests were conducted by varying the initial concentration of methyl orange, contact time and pH of the dye solution. UV-vis results showed that most of the dye was adsorbed within 6 min...
July 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29661305/bio-inspired-hydrophobic-modification-of-cellulose-nanocrystals-with-castor-oil
#15
Qianqian Shang, Chengguo Liu, Yun Hu, Puyou Jia, Lihong Hu, Yonghong Zhou
This work presents an efficient and environmentally friendly approach to generate hydrophobic cellulose nanocrystals (CNC) using thiol-containing castor oil (CO-SH) as a renewable hydrophobe with the assist of bio-inspired dopamine at room temperature. The modification process included the formation of the polydopamine (PDA) buffer layer on CNC surfaces and the Michael addition reaction between the catechol moieties of PDA coating and thiol groups of CO-SH. The morphology, crystalline structure, surface chemistry, thermal stability and hydrophobicity of the modified CNC were charactered by TEM, XRD, FT-IR, solid-state 13 C NMR, XPS, TGA and contact angle analysis...
July 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29661303/super-water-absorbing-polymeric-gel-from-chitosan-citric-acid-and-urea-synthesis-and-mechanism-of-water-absorption
#16
Abathodharanan Narayanan, Ravishankar Kartik, Elanchezhian Sangeetha, Raghavachari Dhamodharan
A new superabsorbent with maximum water absorption capacity of ∼1250 g/g is prepared by hydrothermal synthesis from sustainable and biodegradable resources such as chitosan, citric acid and urea (denoted as 'CHCAUR'). CHCAUR is characterized extensively by various analytical techniques such as PXRD, SSNMR, FTIR, and TGA. Pure and saline water absorption study showed that CHCAUR could be a better adsorbent compared to the super absorbent polymer (SAP) used in commercial diaper material. The mechanism of water absorption is shown to arise out of a combination of electrostatic attraction of water to the ionic crosslinks and the presence of macropores as well as undulated surface due to the formation of nanofibrous bundles...
July 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29661115/synthesis-and-evaluation-of-water-soluble-ph-sensitive-poly-vinyl-alcohol-doxorubicin-conjugates
#17
Nahla Rahoui, Bo Jiang, Nadia Taloub, Mohammad Hegazy, Yu Dong Huang
The accuracy of spatiotemporal control cargo delivery and release are primordial to enhance the therapeutic efficiency and decrease the undesirable effects, in this context a novel prodrug were developed based on biocompatible polyvinyl alcohol (PVA) substrate. PVA was conjugated to doxorubicin (PVA-DOX) via an acid-labile hydrazone linkage. PVA was first functionalized with acidic groups, then reacted with hydrazine hydrate to form an amide bond. The amine group of PVA hydrazide was linked to carbonyl group (C=O) of DOX to form a pH sensitive hydrazone bond...
April 17, 2018: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29660729/biogas-liquid-digestate-grown-chlorella-sp-for-biocrude-oil-production-via-hydrothermal-liquefaction
#18
Hugang Li, Meng Wang, Xinfeng Wang, Yuanhui Zhang, Haifeng Lu, Na Duan, Baoming Li, Dongming Zhang, Taili Dong, Zhidan Liu
Microalgae can not only purify and recover the nutrients from wastewater, but also be harvested as wet biomass for the production of biocrude oil via hydrothermal liquefaction (HTL). Chlorella sp. cultivated in the ultrafiltration (UF) membrane treated anaerobic digestion (AD) liquid digestate of chicken manure was used as the feedstock in this study. The present study characterized the products and investigated the elemental migration during HTL of Chlorella sp. fed with AD effluent wastewater (WW) and BG11 standard medium (ST) in 100mL and 500mL reactors under different operational conditions...
April 13, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29660460/influences-of-modified-bacterial-cellulose-nanofibers-bcns-on-structural-thermophysical-optical-and-barrier-properties-of-poly-ethylene-co-vinyl-acetate-eva-nanocomposite
#19
Shila Shirdel Ghadikolaei, Abdollah Omrani, Morteza Ehsani
The BCNs were chemically modified using acetic anhydride with the aim of improving its dispersion and interfacial adhesion. Acetylation of BCNs was confirmed by FT-IR spectroscopy. Morphology studies using TEM and SEM revealed that a reasonable dispersion of the modified BCNs in the EVA matrix was accomplished. The DSC data displayed a little shift in the Tg to higher temperatures with the incorporation of both modified and unmodified BCNs. Increased thermal stability of the nanocomposites consisting acetylated BCNs was confirmed by TGA technique...
April 13, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29660127/on-the-thermal-behavior-of-protein-isolated-from-different-legumes-investigated-by-dsc-and-tga-analyses
#20
Lucia Ricci, Eleonora Umiltà, Maria Cristina Righetti, Tiziana Messina, Chiara Zurlini, Angela Montanari, Simona Bronco, Monica Bertoldo
BACKGROUND: Peas, lentils, faba beans, chickpeas and beans proteins are potentially renewable raw materials for bioplastic production that can be obtained from agriculture waste. Plastics are usually processed under heating and thus the thermal stability is a mandatory requirement for the application. In this study the thermal behaviour of several legume proteins isolates at different purity degree were investigated. RESULTS: Proteins extracted from legumes exhibited thermal stability maxima for chickpeas, minimum for beans proteins and decreased with the decrease of the protein purity in the 88 % - 30 % range...
April 16, 2018: Journal of the Science of Food and Agriculture
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