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Solid phase extraction of doxorubicin using molecularly imprinted polymer coated magnetite nanospheres prior to its spectrofluorometric determination

22-10-2014 | Mazaher Ahmadi; Tayyebeh Madrakian; Abbas Afkhami, New Journal of Chemistry, 2014

This work reports on the synthesis of a doxorubicin-imprinted polymer nanoadsorbent (DOXMNSs). The imprinted polymer was coated on the surface of magnetite nanospheres. The synthesized DOXMNSs have been characterized using FT-IR, XRD, VSM and TEM measurements. The prepared nanoadsorbent could ...

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Why is sulfuric acid a much stronger acid than ethanol? Determination of the contributions by inductive/field effects and electron-delocalization effects

21-10-2014 | Kevin Lynch; Adam Maloney; Austin Sowell; Changwei Wang; Yirong Mo; Joel M. Karty, Physical Chemistry Chemical Physics, 2014

Two different and complementary computational methods were used to determine the contributions by inductive/field effects and by electron-delocalization effects toward the enhancement of the gas-phase deprotonation enthalpy of sulfuric acid over ethanol. Our alkylogue extrapolation method ...

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Lithium-rich composite metal oxide used as SALDI-MS matrix for the determination of small biomolecules

21-10-2014 | Ze Li; Yi-Wei Zhang; Yue-Long Xin; Yu Bai; Heng-Hui Zhou; Huwei Liu, Chemical Communication, 2014

Lithium-rich composite metal oxide was evaluated as novel matrix for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-MS). The low background interference and lithium-rich feature made it a high efficient matrix for the analysis of small molecules with high ...

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Nanoscale characterization of DNA conformation using dual-color fluorescence axial localization and label-free biosensing

21-10-2014 | Xirui Zhang; George Daaboul; Philipp Sphuler; David Freedman; Abdulkadir Yurt; Sunmin Ahn; Oguzhan Avci; Selim Unlu, Analyst, 2014

Quantitative determination of the density and conformation of DNA molecules tethered to the surface can help optimize and understand DNA nanosensors and nanodevices, which use conformational or motional changes of surface-immobilized DNA for detection or actuation. We present an interferometric ...

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Simultaneous determination of iodide and creatinine in human urine by flow analysis with an on-line sample treatment column

21-10-2014 | Duangjai Nacapricha; Jirayu Sitanurak; Prawpan Inpota; Thitirat Mantim; Nuanlaor Ratanawimarnwong; Prapin Wilairat, Analyst, 2014

This work presents the first flow system for direct analysis of iodide and creatinine for screening of human urine for iodine deficiency disorder. The system had a mini-column packed with strong anion exchange resin for on-line extraction of iodide. After injection of a sample on the column the ...

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Accurate determination of Zn in geological and cosmochemical rock samples by isotope dilution inductively coupled plasma mass spectrometry

21-10-2014 | Rahat Khan; Yuta Yokozuka; Saki Terai; Naoki Shirai; Mitsuru Ebihara, Journal of Analytical Atomic Spectrometry, 2014

Inductively coupled plasma mass spectrometry (ICP-MS) procedures with isotope dilution were established for the accurate determination of trace Zn (in the level of 10-4 to 10-5 g/g) in several tens mg of geological and cosmochemical rock samples. Zinc was determined by 66Zn/67Zn and 68Zn/67Zn ...

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Factors influencing uncertainties of in vivo bone lead measurement using a 109Cd K X-ray fluorescence clover leaf geometry detector system

21-10-2014 | Sepideh Behinaein; David R. Chettle; Leonora Marro; Morie Malowany; Mandy Fisher; David E. B. Fleming; Norm Healey; ..., Journal of Environmental Monitoring, 2014

A 109Cd K X-ray fluorescence (KXRF) measurement system consisting of four detectors in clover-leaf geometry is a non-invasive, low-radiation-dose method of measuring bone lead concentration. Its high precision in estimating the bone lead content makes it a promising tool for the determination of ...

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A fluorescent ratiometric nanosized system for the determination of PdII in water

21-10-2014 | Vieri Fusi; Massimiliano Arca; Claudia Caltagirone; Greta De Filippo; Mauro Formica; Luca Giorgi; Vito Lippolis; Lu ..., Chemical Communication, 2014

Fluorescent ligand (L) based on N2S2 pyridinophane macrocycle and the 7-nitrobenzo[1,2,5]oxadiazole (NBD) fluorogenic fragment has been synthesized to complex Pd2+ ions. Loaded on dye-doped silica nanoparticles, L can be used as ratiometric fluorescent chemosensor for Pd2+ in water with high ...

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“Perfecting” pure shift HSQC: full homodecoupling for accurate and precise determination of heteronuclear couplings

21-10-2014 | Lukas Kaltschnee; Andreas Kolmer; Istvan Timari; Volker Schmidts; Ralph W. Adams; Mathias Nilsson; Katalin E Köver; ..., Chemical Communication, 2014

Fully homodecoupled HSQC spectra can be obtained through the use of a new pulse sequence element, “perfectBIRD”. By way of illustration we show that perfectBIRD decoupling allows one-bond residual dipolar couplings (RDCs), which provide important NMR restraints for structure elucidation, to be ...

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A novel on‐line column extraction apparatus coupled with binary peak focusing for high‐performance liquid chromatography determination of rifampicin in human plasma: A strategy for therapeutic drug monitoring

17-10-2014 | Wei Li, Min Peng, Minghui Long, Ximin Qiu, Liping Yang, Journal of Separation Science, 2014

In order to develop a method which is completely suitable for the routine therapeutic drug monitoring, a sensitive and fully automated on‐line column extraction apparatus in combination with high‐performance liquid chromatography allowing binary peak focusing was developed and validated for ...

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