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Determination of major phenolic compounds in apples: Part I—Optimization of high‐performance liquid chromatography separation with diode array detection

Published: Jun 25, 2018

Author(s): Hana Sklenářová, Aneta Bílková, Martina Pechová, Petr Chocholouš

Journal: Journal of Separation Science

Abstract The separation of seven phenolic compounds including gallic acid, chlorogenic acid, epicatechin, quercitrin, rutin, phloridzin, and phloretin present in apple peel and pulp and differing in elution properties has been optimized using high‐performance liquid chromatography with diode array detection. Several stationary phases were tested to achieve the efficient separation of phenolic compounds in fruit extracts and C18 was...

Read More thumbnail image: Determination of major phenolic compounds in apples Part IOptimization of highperformance liquid chromatography separation with diode array detection

Assessments of tumor metabolism with CEST MRI

Published: Jun 25, 2018

Author(s): Joshua M. Goldenberg, Mark D. Pagel

Journal: NMR in Biomedicine

Chemical exchange saturation transfer (CEST) is a relatively new contrast mechanism for MRI. CEST MRI exploits a specific MR frequency (chemical shift) of a molecule while generating an image with good spatial resolution using standard MRI techniques, combining the specificity of MRS with the spatial resolution of MRI. Many CEST MRI acquisition methods have been developed to improve analyses of tumor metabolism. GluCEST, CrCEST, and...

Read More thumbnail image: Assessments of tumor metabolism with CEST MRI

Synergistic thermo‐Raman and calorimetric kinetic study of the cation modifier's role in binary metaphosphate glasses

Published: Jun 25, 2018

Author(s): Mariana Sendova, José A. Jiménez

Journal: Journal of Raman Spectroscopy

Abstract A comprehensive temperature‐dependent Raman spectroscopy and differential scanning calorimetry study has been performed on three metaphosphate glasses with different modifying cations (Ca2+, Ba2+, and Pb2+). The P–NBO (nonbridging oxygen) Raman spectral feature, the force constant, and the glass transition activation energy (AETg) are shown to be strongly correlated to the relative effective nuclear charge difference between the modifying and the...

Read More thumbnail image: Synergistic thermoRaman and calorimetric kinetic study of the cation modifiers role in binary metaphosphate glasses

Genetic support vector machines as powerful tools for the analysis of biomedical Raman spectra

Published: Jun 25, 2018

Author(s): Robert Hunter, Hanan Anis

Journal: Journal of Raman Spectroscopy

Abstract The growing number of applications of Raman spectroscopy in medicine necessitates the development of robust and accurate processing methods. The two major tasks for which Raman spectra are used are quantifying chemical species in a sample (regression) and discriminating chemically distinct samples (classification). Conventionally, linear techniques, primarily projection to latent structures (PLS), are used to perform these...

Read More thumbnail image: Genetic support vector machines as powerful tools for the analysis of biomedical Raman spectra

Initial excited‐state structural dynamics of uridine from resonance Raman spectroscopy

Published: Jun 25, 2018

Author(s): Swaroop Sasidharanpillai, Steve P. Dempster, Glen R. Loppnow

Journal: Journal of Raman Spectroscopy

Abstract The effect of the N1 ribose sugar on the initial excited‐state structural dynamics of uridine is explored with ultraviolet resonance Raman spectroscopy. Excited‐state slopes and broadening parameters were obtained by simulating the resonance Raman excitation profiles and absorption spectrum using a self‐consistent, time‐dependent formalism. The initial excited‐state structural dynamics of uridine look similar to those of...

Read More thumbnail image: Initial excitedstate structural dynamics of uridine from resonance Raman spectroscopy

Rapid and noninvasive quality control of anhydrous milk fat by PTR‐MS: The effect of storage time and packaging

Published: Jun 22, 2018

Author(s): M. Pedrotti, I. Khomenko, L. Cappellin, M. Fontana, M. Somenzi, L. Falchero, M. Arveda, V. Fogliano, F. Biasioli

Journal: Journal of Mass Spectrometry

Abstract In this study, proton transfer reaction‐mass spectrometry (PTR‐MS), coupled with a time‐of‐flight mass analyzer and a multipurpose automatic sampler, was evaluated as a rapid and nondestructive tool for the quality control of anhydrous milk fat. Anhydrous milk fats packed in cardboard and bag‐in‐box were compared during refrigerated shelf life at 4°C for 9 months. Anhydrous milk fat samples were taken at 120, 180, and...

Read More thumbnail image: Rapid and noninvasive quality control of anhydrous milk fat by PTRMS The effect of storage time and packaging

Rapid and noninvasive quality control of anhydrous milk fat by PTR‐MS: The effect of storage time and packaging

Published: Jun 22, 2018

Author(s): M. Pedrotti, I. Khomenko, L. Cappellin, M. Fontana, M. Somenzi, L. Falchero, M. Arveda, V. Fogliano, F. Biasioli

Journal: Journal of Mass Spectrometry

Abstract In this study, proton transfer reaction‐mass spectrometry (PTR‐MS), coupled with a time‐of‐flight mass analyzer and a multipurpose automatic sampler, was evaluated as a rapid and nondestructive tool for the quality control of anhydrous milk fat. Anhydrous milk fats packed in cardboard and bag‐in‐box were compared during refrigerated shelf life at 4°C for 9 months. Anhydrous milk fat samples were taken at 120, 180, and...

Read More thumbnail image: Rapid and noninvasive quality control of anhydrous milk fat by PTRMS The effect of storage time and packaging

Simultaneous derivatization and lighter‐than‐water air‐assisted liquid–liquid microextraction using a homemade device for the extraction and preconcentration of some parabens in different samples

Published: Jun 22, 2018

Author(s): Mir Ali Farajzadeh, Mehri Bakhshizadeh Aghdam, Mohammad Reza Afshar Mogaddam, Ali Akbar Alizadeh Nabil

Journal: Journal of Separation Science

Abstract Simultaneous derivatization and air‐assisted liquid–liquid microextraction using an organic that is solvent lighter than water has been developed for the extraction of some parabens in different samples with the aid of a newly designed device for collecting the extractant. For this purpose, the sample solution is transferred into a glass test tube and a few microliters of acetic anhydride (as a derivatization agent) and...

Read More thumbnail image: Simultaneous derivatization and lighterthanwater airassisted liquidliquid microextraction using a homemade device for the extraction and preconcentration of some parabens in different samples

Hydrazide functionalized magnetic nanoparticles for specific extraction of N‐ terminal serine and threonine peptides

Published: Jun 21, 2018

Author(s): Mohammad Saraji, Shila Yousefi

Journal: Biomedical Chromatography

Abstract In this study, we present hydrazide functionalized magnetic nanoparticles as a sorbent prepared by a new and facile method. Scanning electron microscope and Fourier transform infrared were used for characterizing the synthesized nanoparticles. The ability of the sorbent to extract N‐terminal serine and threonine peptides was evaluated. The peptides were modified by oxidation of the hydroxyl group in the 1,2‐amino alcohol...

Read More thumbnail image: Hydrazide functionalized magnetic nanoparticles for specific extraction of N terminal serine and threonine peptides

Development and validation of a UPLC–MS/MS method for determination of Sarsasapogenin‐AA22 in rat plasma and its application to a pharmacokinetic study

Published: Jun 21, 2018

Author(s): Lixia Pei, Songlan Ge, Yiyi Ye, Ziwei Jiang, Xiaoqiang Liang, Wenshu Zhao, Lei Ma

Journal: Biomedical Chromatography

Abstract A sarsasapogenin derivative, sarsasapogenin‐AA22 (AA22), with cyclobutylamine at the 3‐hydroxyl position of sarsasapogenin, has great neuroprotective activity in PC12 cells and NO production inhibitory activity in RAW264.7 cell lines. A method was developed to determine AA22 in rat plasma which was further applied to evaluate the pharmacokinetics of AA22 after taking a single dose of AA22. Liquid chromatography tandem mass...

Read More thumbnail image: Development and validation of a UPLCMSMS method for determination of SarsasapogeninAA22 in rat plasma and its application to a pharmacokinetic study

L‐ and D‐threo ethylphenidate concentrations, pharmacokinetics, and pharmacodynamics in horses

Published: Jun 21, 2018

Author(s): Heather K. Knych, Dan S. McKemie, Kelsey Seminoff, Petra Hartmann, Lynn Hovda, Dionne Benson

Journal: Drug Testing and Analysis

Abstract Ethylphenidate is a psychostimulant and analog of the commonly prescribed compound, methylphenidate (Ritalin®). There are a limited number of studies describing the disposition and pharmacologic/toxicological effects of ethylphenidate in any species. The abuse potential in equine athletes along with the limited data available regarding administration in horses necessitates further study. The objectives of the current study...

Read More thumbnail image: L and Dthreo ethylphenidate concentrations pharmacokinetics and pharmacodynamics in horses

Monitoring dehydroepiandrosterone (DHEA) in the urine of Thoroughbred geldings for doping control purposes

Published: Jun 21, 2018

Author(s): Marjaana Viljanto, Pamela Hincks, Lynn Hillyer, Adam Cawley, Craig Suann, Glenys Noble, Christopher J. Walker, Mark C. Parkin, Andrew T. Kicman, James Scarth

Journal: Drug Testing and Analysis

Abstract The use of testosterone and its pro‐drugs, such as dehydroepiandrosterone (DHEA), is currently regulated in horseracing by the application of international testosterone thresholds. However, additional steroidomic approaches, such as steroid ratios, to distinguish overall adrenal stimulation from drug administrations and an equine biological passport for longitudinal steroid profiling of individual animals could be...

Read More thumbnail image: Monitoring dehydroepiandrosterone DHEA in the urine of Thoroughbred geldings for doping control purposes

Developing a robust LC–MS/MS method to quantify Zn‐DTPA, a zinc chelate in human plasma and urine

Published: Jun 21, 2018

Author(s): Lin Yu, Fanhua Meng, Miao Guo, Ying Yang, Jianchang He, Junxing Dong, Jifen Guo, Shuangqing Peng

Journal: Biomedical Chromatography

Abstract Quantitation of Zn‐DTPA (zinc diethylenetriamene pentaacetate, a metal chelate) in complex biological matrix is extremely challenging on account of its special physiochemical properties. This study aimed to develop a robust and specific liquid chromatography–tandem mass spectrometry (LC–MS/MS) method for determination of Zn‐DTPA in human plasma and urine. The purified samples were separated on Proteonavi (250 × 4.6 mm,...

Read More thumbnail image: Developing a robust LCMSMS method to quantify ZnDTPA a zinc chelate in human plasma and urine

Development, validation and comparison of surrogate matrix and surrogate analyte approaches with UHPLC–MS/MS to simultaneously quantify dopamine, serotonin and γ ‐aminobutyric acid in four rat brain regions

Published: Jun 21, 2018

Author(s): Rong‐xia Liu, You‐yan Xian, Sha Liu, Fei Yu, Hong‐jie Mu, Kao‐xiang Sun, Wan‐hui Liu

Journal: Biomedical Chromatography

Abstract As biomarkers, endogenous neurotransmitters play critical roles in the process of neuropsychiatric diseases, and neurotransmitter levels in different brain regions can contribute to neurological disease diagnosis and treatment. Due to the lack of a blank matrix for endogenous neurotransmitters, surrogate‐matrix and surrogate‐analyte approaches have been used for the determination of neurotransmitters to solve this problem....

Read More thumbnail image: Development validation and comparison of surrogate matrix and surrogate analyte approaches with UHPLCMSMS to simultaneously quantify dopamine serotonin and  aminobutyric acid in four rat brain regions

Vibrations and chemical states of iron ions in soda‐lime glasses determined by element‐specific X‐ray analyses

Published: Jun 21, 2018

Author(s): Kyoko Okada, Yukihito Nagashima, Koichi Shiraki, Hiroki Kageyama, Hironori Ofuchi, Yoshitaka Yoda, Yasuhiro Kobayashi, Norimasa Umesaki, Yoshiharu Sakurai

Journal: X-Ray Spectrometry

We systematically study medium‐range structures including more than three neighboring atoms around iron ions (Fe2+ and Fe3+) in soda‐lime glass samples with low iron oxide concentrations (MFe2O3) and a wide number ratio of Fe2+ to all iron ions (Fe2+/ΣnFe). The precise medium‐range structures around iron ions in glass have not yet been revealed because of a lack of the appropriate measurement methods. To avoid this problem, we used element‐specific nuclear...

Read More thumbnail image: Vibrations and chemical states of iron ions in sodalime glasses determined by elementspecific Xray analyses

Preliminary in situ teeth study of the narrow‐ridged finless porpoises remains using microsynchrotron radiation X‐ray fluorescence and laser ablation inductively coupled plasma mass spectrometry

Published: Jun 21, 2018

Author(s): Yi Zheng, Ya Zhang, Wenqiao Tang, Hongyi Guo, Yan Zhu, Zhaohui Dong, Hui Jiang

Journal: X-Ray Spectrometry

In recent years, a growing number of the narrow‐ridged finless porpoises were found dead near the Yangtze River estuary. In this region lived two sympatric subspecies, respectively, the East Asian finless porpoise and the Yangtze finless porpoise. So far, it is difficult to distinguish these two subspecies due to their similar shape and unavailable molecular marker. In this work, synchrotron radiation X‐ray fluorescence (SRXRF) and laser...

Read More thumbnail image: Preliminary in situ teeth study of the narrowridged finless porpoises remains using microsynchrotron radiation Xray fluorescence and laser ablation inductively coupled plasma mass spectrometry

Visualizing underdrawings in medieval manuscript illuminations with macro‐X‐ray fluorescence scanning

Published: Jun 21, 2018

Author(s): Nancy K. Turner, Catherine Schmidt Patterson, Douglas K. MacLennan, Karen Trentelman

Journal: X-Ray Spectrometry

The element‐specific distribution maps generated by scanning macro‐X‐ray fluorescence (XRF) spectroscopy are providing cultural heritage researchers with information about the composition of materials present in works of art and, more importantly, unprecedented insight into the techniques employed by artists in their creation. One of the advantages of macro‐XRF scanning is that the X‐rays probe materials in subsurface layers, allowing,...

Read More thumbnail image: Visualizing underdrawings in medieval manuscript illuminations with macroXray fluorescence scanning

Handheld surface‐enhanced Raman scattering identification of dye chemical composition in felt‐tip pen drawings

Published: Jun 21, 2018

Author(s): Daniela Saviello, Alexandra Di Gioia, Pierre‐Ives Turenne, Maddalena Trabace, Rodorico Giorgi, Antonio Mirabile, Piero Baglioni, Daniela Iacopino

Journal: Journal of Raman Spectroscopy

Abstract A handheld Raman spectrometer is used for the first time to perform surface‐enhanced Raman scattering (SERS) analysis of felt‐tip pen drawings on paper. The use of SERS combined with near‐infrared excitation wavelength allows overcoming the strong fluorescence background interference so that diagnostic spectra are obtained from drawings made by 18 pens of 10 different colors and five different brands. The analysis reveals...

Read More thumbnail image: Handheld surfaceenhanced Raman scattering identification of dye chemical composition in felttip pen drawings

Spark plasma sintering preparation of reference targets for field spectroscopy on Mars

Published: Jun 21, 2018

Author(s): G. Montagnac, G. Dromart, P. Beck, F. Mercier, B. Reynard, A. Cousin, S. Maurice, R. Wiens

Journal: Journal of Raman Spectroscopy

Abstract We propose spark plasma sintering (SPS) as a technique to prepare reference targets for Raman and other spectroscopy instruments involved in future space missions and more generally in‐field work. We have tested the effect of SPS on different international standards that are available in the form of minerals and rocks powders. Advantages and potential issues of SPS were considered by analyzing the Raman signal and...

Read More thumbnail image: Spark plasma sintering preparation of reference targets for field spectroscopy on Mars

In Silico Prediction and Validation of Novel RNA Binding Proteins and Residues in the Human Proteome

Published: Jun 20, 2018

Author(s): Shomeek Chowdhury, Jian Zhang, Lukasz Kurgan

Journal: PROTEOMICS

Abstract Deciphering a complete landscape of protein–RNA interactions in the human proteome remains an elusive challenge. We computationally elucidate RNA binding proteins (RBPs) using an approach that complements previous efforts. We employ two modern complementary sequence‐based methods that provide accurate predictions from the structured and the intrinsically disordered sequences, even in the absence of sequence similarity to...

Read More thumbnail image: In Silico Prediction and Validation of Novel RNA Binding Proteins and Residues in the Human Proteome
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