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Separation of selenium species and their sensitive determination in rice samples by ion‐pairing reversed‐phase liquid chromatography with inductively coupled plasma tandem mass spectrometry

Published: Nov 28, 2017

Author(s): Huan‐Huan Gao, Ming‐Xue Chen, Xian‐Qiao Hu, Shuang‐Shuang Chai, Mei‐Ling Qin, Zhao‐Yun Cao

Journal: Journal of Separation Science

Abstract A highly sensitive method was developed for the simultaneous separation and determination of organic and inorganic selenium species in rice by ion‐pairing reversed‐phase chromatography combined with inductively coupled plasma tandem mass spectrometry. To achieve a good separation of these species, a comparison between anion‐exchange chromatography and ion‐pairing reversed‐phase chromatography was performed. The results...

Read More thumbnail image: Separation of selenium species and their sensitive determination in rice samples by ionpairing reversedphase liquid chromatography with inductively coupled plasma tandem mass spectrometry

Charge transfer during H/H collisions with C u(100) and C u(111) surfaces

Published: Nov 28, 2017

Author(s): B. Bahrim, J. Stafford, B. Makarenko

Journal: Surface and Interface Analysis

We study the H and H− survival probabilities during collisions with Cu(100) and Cu(111) surfaces, at energies ranging from 0.5 to 5 keV and exit angles ranging from 20° to 90°. Calculations are performed with the Wave‐Packet Propagation method adapted to ion‐surface interactions. The projectile survival probability depends on the perpendicular velocity and the copper face being investigated. Projectile's interaction time with the...

Read More thumbnail image: Charge transfer during HH  collisions with C u100 and C u111 surfaces

Spectroscopy on photografted polyethylene surfaces using a perfluorophenyl azide: Evidence for covalent attachment

Published: Nov 28, 2017

Author(s): Konstantin Siegmann, Jan Inauen, Robert Sterchi, Martin Winkler

Journal: Surface and Interface Analysis

The present study was conducted in order to confirm C―H insertion of a perfluorophenyl nitrene, produced by UV‐irradiation of a perfluorophenyl azide, to polyethylene surfaces. It was shown previously that water‐repelling, oil‐repelling, and dirt‐repelling polyethylene surfaces can be created by “grafting to” of perfluoroalkanes using a photoreactive surface modifier based on azide/nitrene chemistry. The abrasion...

Read More thumbnail image: Spectroscopy on photografted polyethylene surfaces using a perfluorophenyl azide Evidence for covalent attachment

Plasma treatment of bamboo fibers on the tribological property of polyimide composite filled with graphite

Published: Nov 28, 2017

Author(s): Chuanwang Sun, Aijun Liu, Gang Du

Journal: Surface and Interface Analysis

This paper is concerned with the effects of the air plasma surface treatment of bamboo fiber on the tribological properties of the bamboo fiber reinforced polyimide (bamboo/polyimide) composites filled with graphite. Plasma treatment and graphite bring positive effect on the improvement of friction reducing and antiwear of bamboo/polyimide composites. And Fourier transform infrared spectroscopy analysis shows that the bamboo fibers have...

Read More thumbnail image: Plasma treatment of bamboo fibers on the tribological property of polyimide composite filled with graphite

Dye degradation studies of Mo‐doped TiO 2 thin films developed by reactive sputtering

Published: Nov 28, 2017

Author(s): M. Sreedhar, J. Brijitta, I. Neelakanta Reddy, Migyung Cho, Jaesool Shim, Parthasarathi Bera, Bhavana N. Joshi, Sam S. Yoon

Journal: Surface and Interface Analysis

TiO2 thin films with various Mo concentrations have been deposited on glass and n‐type silicon (100) substrates by this radio‐frequency (RF) reactive magnetron sputtering at 400°C substrate temperature. The crystal structure, surface morphology, composition, and elemental oxidation states of the films have been analyzed by using X‐ray diffraction, field emission scanning electron microscopy, atomic force microscopy, and X‐ray...

Read More thumbnail image: Dye degradation studies of Modoped TiO 2 thin films developed by reactive sputtering

Ultrathin films of Ge on the Si(100)2 × 1 surface

Published: Nov 28, 2017

Author(s): M. Kamaratos, A.K. Sotiropoulos, D. Vlachos

Journal: Surface and Interface Analysis

The Ge/Si(100)2 × 1 interface was investigated by means of Auger electron spectroscopy, low‐energy electron diffraction, thermal desorption spectroscopy, and work function measurements, in the regime of a few monolayers. The results show that growth of Ge at room temperature forms a thermally stable amorphous interface without significant intermixing and interdiffusion into the substrate, for annealing up to ~1100 K....

Read More thumbnail image: Ultrathin films of Ge on the Si10021 surface

Effect of oxygen plasma treatment and gold sputtering on morphological and local mechanical properties of copolyimide/gold micropatterned structures

Published: Nov 28, 2017

Author(s): Iuliana Stoica, Magdalena Aflori, Emil Ghiocel Ioanid, Camelia Hulubei

Journal: Surface and Interface Analysis

Atomic force microscopy (AFM) was used to analyze rectangular 3‐dimensional patterned microstructures with different functionalities induced on copolyimide containing alicyclic sequences film surfaces by means of oxygen plasma treatment. The plasma power was ranged to be big enough to accelerate the plasma species towards the copolyimide surface, and the exposure time was not very small to generate a roughness that still can be monitored...

Read More thumbnail image: Effect of oxygen plasma treatment and gold sputtering on morphological and local mechanical properties of copolyimidegold micropatterned structures

Molecular dynamics characterization of silver colloidal interfaces for SERS applications. Gallic acid test

Published: Nov 27, 2017

Author(s): D. Muñoz‐Gacitúa, C. Garrido, A. Ruiz‐Fernández, H. Ahumada, M. M. Campos‐Vallette, R. Araya‐Maturana, B. E. Weiss‐López

Journal: Journal of Raman Spectroscopy

Abstract One of the most useful applications of silver colloidal solutions is in surface‐enhanced Raman spectroscopy (SERS), because the amplification factor of about 106 allows the vibrational study and detection of highly diluted species in aqueous environment, and more recently in early diagnosis of cancer and imaging. A useful colloid for SERS is that reported by Leopold and Lendl (Colloid 1). However, SERS response from...

Read More thumbnail image: Molecular dynamics characterization of silver colloidal interfaces for SERS applications_ Gallic acid test

Anharmonicity and Fermi resonance in the vibrational spectra of a CO 2 molecule and CO 2 molecular crystal: Similarity and distinctions

Published: Nov 27, 2017

Author(s): Valentyna V. Nosenko, Galyna Yu. Rudko, Anatoliy M. Yaremko, Volodymyr O. Yukhymchuk, Olexandr M. Hreshchuk

Journal: Journal of Raman Spectroscopy

Abstract The vibrational spectra of a molecule and related molecular crystal are systematically analyzed theoretically with the account of the influence of anharmonic interactions between the vibrations. The specific anharmonism‐induced features in the spectra of a molecule and crystal are revealed, and spectral lineshapes at varied strength of anharmonic interaction are simulated. The proposed general theoretical approach is used...

Read More thumbnail image: Anharmonicity and Fermi resonance in the vibrational spectra of a CO 2 molecule and CO 2 molecular crystal Similarity and distinctions

SERS detection of polyaromatic hydrocarbons on a β‐cyclodextrin containing polymer brush

Published: Nov 27, 2017

Author(s): Adem Zengin, Ugur Tamer, Tuncer Caykara

Journal: Journal of Raman Spectroscopy

Abstract We have designed a new surface‐enhanced Raman scattering (SERS) sensor composed of β‐cyclodextrin (β‐CD) containing poly(glycidyl methacrylate) (PGMA) brush coated silicon substrate and per‐6‐deoxy‐(6‐thio)‐β‐cyclodextrin (β‐CD‐SH) modified gold nanoparticles for detection of polyaromatic hydrocarbons (PAHs; pyrene and anthracene). The β‐CD containing PGMA brushes were synthesized by the interface‐mediated Reversible...

Read More thumbnail image: SERS detection of polyaromatic hydrocarbons on a cyclodextrin containing polymer brush

Swift heavy ion induced material modifications in Ba1‐xSrxTiO3 ceramics as probed by temperature‐dependent R aman spectroscopy

Published: Nov 27, 2017

Author(s): P.K. Bajpai, C.R.K. Mohan, Ratnamala Ganjir, Ravi Kumar, Ashok Kumar, R.S. Katiyar

Journal: Journal of Raman Spectroscopy

Abstract Effect of 100 MeV O8+ swift heavy ion (SHI) irradiation on phonon properties of Ba1‐xSrxTiO3 (x = 0.10, 0.15) ceramics are probed using Raman spectroscopy. Temperature‐dependent Raman spectra in the range (100 °C to −190 °C) have been investigated, and deconvoluted Raman modes parameters are used in pristine and irradiated ceramics to understand the effect of ion irradiation on phonon modes. Raman bands are...

Read More thumbnail image: Swift heavy ion induced material modifications in Ba1xSrxTiO3 ceramics as probed by temperaturedependent R aman spectroscopy

Integrating spatial, morphological, and textural information for improved cell type differentiation using Raman microscopy

Published: Nov 27, 2017

Author(s): Sascha D. Krauß, Hesham K. Yosef, Tatjana Lechtonen, Hendrik Jütte, Andrea Tannapfel, Heiko U. Käfferlein, Thomas Brüning, Florian Roghmann, Joachim Noldus, Samir F. El‐Mashtoly, Klaus Gerwert, Axel Mosig

Journal: Journal of Chemometrics

Abstract Raman microscopy is a well‐established tool for distinguishing different cell types in cell biological or cytopathological applications, since it can provide maps that show the specific distribution of biochemical components in the cell, with high lateral and spatial resolution. Currently, established data analysis approaches for differentiating cells of different types mostly rely on conventional chemometrics approaches,...

Read More thumbnail image: Integrating spatial morphological and textural information for improved cell type differentiation using Raman microscopy

Study of chemical shift in Ll and X‐ray emission lines in different chemical forms of 48 Cd and 50 Sn compounds using WDXRF technique

Published: Nov 27, 2017

Author(s): Harpreet Singh Kainth, Ranjit Singh, J.S. Shahi, Tejbir Singh

Journal: X-Ray Spectrometry

Chemical shift in Ll and Lƞ X‐ray emission lines of 48Cd and 50Sn elements in various chemical compounds was determined with high resolution wavelength dispersive X‐ray fluorescence (WDXRF) spectrometer. The positive and negative shifts were measured in 48Cd compounds viz, CdS, CdB4O7, CdCl2, Cd3(PO4)2, CdCO3, CdI2 and CdO with reference to pure Cd foil and 50Sn compounds viz, Sn(CrO4)2, SnO, SnO2, SnCl2, SnF2, SnF4 with reference to pure Sn foil. The measured...

Read More thumbnail image: Study of chemical shift in Ll and L Xray emission lines in different chemical forms of 48 Cd and 50 Sn compounds using WDXRF technique

Determination of thiocyanate as a biomarker of tobacco smoke constituents in selected biological materials of human origin

Published: Nov 27, 2017

Author(s): Sylwia Narkowicz, Ewa Jaszczak, Żaneta Polkowska, Bogumiła Kiełbratowska, Alicja Kotłowska, Jacek Namieśnik

Journal: Biomedical Chromatography

Abstract In order to protect human health, it is necessary to biomonitor toxic substances originating from tobacco smoke in biological materials sampled from persons with different exposures to tobacco smoke constituents. Thiocyanate anion is a biomarker of exposure to tobacco smoke components which is characterized by a relatively long half‐life in the human body, i.e. 6 days. In this work, we present the results of thiocyanate...

Read More thumbnail image: Determination of thiocyanate as a biomarker of tobacco smoke constituents in selected biological materials of human origin

Mass spectrometry of aerosol particle analogues in molecular beam experiments

Published: Nov 27, 2017

Author(s): Michal Fárník, Jozef Lengyel

Journal: Mass Spectrometry Reviews

Nanometer‐size particles such as ultrafine aerosol particles, ice nanoparticles, water nanodroplets, etc, play an important, however, not yet fully understood role in the atmospheric chemistry and physics. These species are often composed of water with admixture of other atmospherically relevant molecules. To mimic and investigate such particles in laboratory experiments, mixed water clusters with atmospherically...

Read More thumbnail image: Mass spectrometry of aerosol particle analogues in molecular beam experiments

Comparative study on chemical components and anti‐inflammatory effects of Panax notoginseng flower extracted by water and methanol

Published: Nov 27, 2017

Author(s): Li‐Juan Ma, Fang Liu, Zhang‐Feng Zhong, Jian‐Bo Wan

Journal: Journal of Separation Science

Abstract Methanol and water are commonly used solvents for chemical analysis and traditional decoction, respectively. In the present study, a high‐performance liquid chromatography with ultraviolet detection method was developed to quantify 11 saponins in Panax notoginseng flower extracted by aqueous solution and methanol, and chemical components and anti‐inflammatory effects of these two extracts were compared. The separation of 11...

Read More thumbnail image: Comparative study on chemical components and antiinflammatory effects of Panax notoginseng flower extracted by water and methanol

Qualitative analysis of multiple compounds in raw and prepared Semen Cassiae coupled with multiple statistical strategies

Published: Nov 27, 2017

Author(s): Bing Yang, Jing Hu, Xiaochai Zhu, Yanshuang Zhuang, Fangzhou Yin, Kunming Qin, Baochang Cai

Journal: Journal of Separation Science

Abstract In China, Semen Cassiae is used clinically to improve eyesight, relieve constipation, and to treat headache and dizziness. Prepared Semen Cassiae is obtained by stir‐frying raw Semen Cassiae until it turned dark brown, micro dilatancy, and overflow aroma. After processing, the therapeutic effects change—the purgation effect is alleviated and the hepatoprotective effect is enhanced. To explore the changes in chemical...

Read More thumbnail image: Qualitative analysis of multiple compounds in raw and prepared Semen Cassiae coupled with multiple statistical strategies

Quantitative fingerprinting based on the limited‐ratio quantified fingerprint method for an overall quality consistency assessment and antioxidant activity determination of Lianqiao Baidu pills using HPLC with a diode array detector combined with chemometric methods

Published: Nov 27, 2017

Author(s): Shuai Chen, Guoxiang Sun, Didi Ma, Lanping Yang, Jing Zhang

Journal: Journal of Separation Science

Abstract Lianqiao Baidu pills are widely used herbal medicinal preparation that were analyzed to develop a quality consistency technique. The characteristic fingerprints of 28 batches of Lianqiao Baidu pill samples were established at five wavelengths and simultaneously assessed by using a limited‐ratio quantified fingerprint method using 15 marker compounds. The principal component analysis and fingerprinting results were compared,...

Read More thumbnail image: Quantitative fingerprinting based on the limitedratio quantified fingerprint method for an overall quality consistency assessment and antioxidant activity determination of Lianqiao Baidu pills using HPLC with a diode array detector combined with chemometric methods

Simultaneous analysis of carbohydrates, polyols and amines in urine samples using chemical ionization gas chromatography with tandem mass spectrometry

Published: Nov 27, 2017

Author(s): Róbert Kubinec, Peter Kotora, Viktória Ferenczy, Jaroslav Blaško, Peter Podolec, Alexandra Hengerics Szabó, Darina Behúlová, Václav Bierhanzl, Radomír Čabala, Stanislav Stuchlík, Wojciech Filipiak, Ngô Mạnh Thắng

Journal: Journal of Separation Science

Abstract A simple method for the simultaneous derivatization of carbohydrates, polyols, amines and amino acids using hexamethyldisilazane and N,O‐bis(trimethylsilyl)trifluoroacetamide was developed. This method allows the direct derivatization of urine samples without sample pretreatment before derivatization. The method was successfully used for analysis of the selected metabolites in urine samples of healthy individuals and...

Read More thumbnail image: Simultaneous analysis of carbohydrates polyols and amines in urine samples using chemical ionization gas chromatography with tandem mass spectrometry

Ion‐pair‐based hollow‐fiber liquid‐phase microextraction combined with high‐performance liquid chromatography for the simultaneous determination of urinary benzene, toluene, and styrene metabolites

Published: Nov 27, 2017

Author(s): Abdulrahman Bahrami, Farhad Ghamari, Yadollah Yamini, Farshid Ghorbani Shahna, Ali Koolivand

Journal: Journal of Separation Science

Abstract In the current study, a novel technique for extraction and determination of trans,trans‐muconic acid, hippuric acid, and mandelic acid was developed by means of ion‐pair‐based hollow fiber liquid‐phase microextraction in the three‐phase mode. Important factors affecting the extraction efficiency of the method were investigated and optimized. These metabolites were extracted from 10 mL of the source phase into a supported liquid...

Read More thumbnail image: Ionpairbased hollowfiber liquidphase microextraction combined with highperformance liquid chromatography for the simultaneous determination of urinary benzene toluene and styrene metabolites
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