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Sample preparation in foodomic analyses

Published: May 8, 2018

Author(s): Tamara Martinović, Martina Šrajer Gajdošik, Djuro Josić

Journal: ELECTROPHORESIS

Abstract Representative sampling and adequate sample preparation are key factors for successful performance of further steps in foodomic analyses, as well as for correct data interpretation. Incorrect sampling and improper sample preparation can be sources of severe bias in foodomic analyses. It is well known that both wrong sampling and sample treatment cannot be corrected anymore. These, in the past frequently neglected facts, are...

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Application of pathways activity profiling to urine metabolomics for screening Qi‐tonifying biomarkers and metabolic pathways of honey‐processed Astragalus

Published: May 8, 2018

Author(s): Wuping Liu, Chanyi Li, Jing Huang, Jingzhu Liao, Shuangye Liao, Wenjie Ma, Hongyuan Chen, Wen Rui

Journal: Journal of Separation Science

Abstract Honey‐processed Astragalus, a widely used Qi‐tonifying and immunomodulating herb in traditional Chinese medicine, has strengthened the tonic effects and achieved fewer side effects compared with astragali radix in clinical application. Here, we focus on Qi‐tonifying biomarkers and pathways of honey‐processed Astragalus using urine metabolomics that provide the basis for building the linkage between metabolites in rat urine and its...

Read More thumbnail image: Application of pathways activity profiling to urine metabolomics for screening Qitonifying biomarkers and metabolic pathways of honeyprocessed Astragalus

Measurement of water absorption capacity in wheat flour by a headspace gas chromatographic technique

Published: May 8, 2018

Author(s): Wei‐Qi Xie, Kong‐Xian Yu, Yi‐Xian Gong

Journal: Journal of Separation Science

Abstract The purpose of this work is to introduce a new method for quantitatively analyzing water absorption capacity in wheat flour by a headspace gas chromatographic technique. This headspace gas chromatographic technique was based on measuring the water vapor released from a series of wheat flour samples with different contents of water addition. According to the different trends between the vapor and wheat flour phase before and...

Read More thumbnail image: Measurement of water absorption capacity in wheat flour by a headspace gas chromatographic technique

X‐radiography of cultural heritage materials using handheld XRF spectrometers

Published: May 8, 2018

Author(s): Jiuan Jiuan Chen, Aaron Shugar, Ashley Jehle

Journal: X-Ray Spectrometry

This study investigated the feasibility, repeatability, and limitations of using handheld X‐ray fluorescence spectrometers to perform radiography with thorough safety measures. Radiography is a well‐established nondestructive technique commonly used in the field of cultural heritage preservation but not easily accessible to many. Equipped with X‐ray generating tubes, handheld spectrometers could potentially assist performing radiographic...

Read More thumbnail image: Xradiography of cultural heritage materials using handheld XRF spectrometers

Nuclear magnetic resonance (NMR)‐based metabolomics for cancer research

Published: May 7, 2018

Author(s): Renuka Ranjan, Neeraj Sinha

Journal: NMR in Biomedicine

Nuclear magnetic resonance (NMR) has emerged as an effective tool in various spheres of biomedical research, amongst which metabolomics is an important method for the study of various types of disease. Metabolomics has proved its stronghold in cancer research by the development of different NMR methods over time for the study of metabolites, thus identifying key players in the aetiology of cancer. A plethora of one‐dimensional and...

Read More thumbnail image: Nuclear magnetic resonance NMRbased metabolomics for cancer research

Study of supercritical CO 2 extraction of tamarillo ( Cyphomandra Betacea ) seed oil containing high added value compounds

Published: May 7, 2018

Author(s): Daniela Dorado Achicanoy, Andrés Hurtado Benavides, Hugo A. Martínez‐Correa

Journal: ELECTROPHORESIS

Abstract In the present investigation, the extraction of tamarillo seed oil was conducted using supercritical carbon dioxide (SC‐CO2), under different conditions of pressure (20–38.1 MPa) and temperature (40–64°C). In order to determine the effect that these extraction parameters have over the yield and composition of the oil, a central composite design was used. The optimum yield was 21.07% obtained at 38.1 MPa and 64°C. The fatty...

Read More thumbnail image: Study of supercritical CO 2 extraction of tamarillo  Cyphomandra Betacea  seed oil containing high added value compounds

N‐shell ionization cross sections by proton impact in the BEA

Published: May 7, 2018

Author(s): Takeshi Mukoyama

Journal: X-Ray Spectrometry

The N‐subshell ionizations cross sections of heavy elements by proton impact have been calculated in the binary‐encounter approximation. The momentum distribution of target electrons is taken into account by the use of the nonrelativistic and relativistic hydrogenic models and the Hartree–Fock–Roothaan and the relativistic Hartree–Fock–Roothaan methods. The obtained subshell ionization cross sections are compared with the experimental...

Read More thumbnail image: Nshell ionization cross sections by proton impact in the BEA

A preliminary assessment of microstructural and compositional characteristics of two variants of precarbonated and postcarbonated concrete mixes

Published: May 7, 2018

Author(s): Shwetambara Verma, Somesh Sengupta, Srinivasan Varadharajan, Arun Kumar

Journal: X-Ray Spectrometry

The hydration, precarbonation, and postcarbonation microstructural and compositional attributes of 2 variants of concrete were studied using scanning electron microscope, energy dispersive spectroscopy, and X‐ray diffraction techniques. Results obtained showed presence of large number of diffraction peaks indicative of SiO2 as major phase. Higher pH, alkalinity, and absence of effects of carbonation were suggested from the presence of portlandite ...

Read More thumbnail image: A preliminary assessment of microstructural and compositional characteristics of two variants of precarbonated and postcarbonated concrete mixes

Experimental versus theoretical log D 7.4 , pK a and plasma protein binding values for benzodiazepines appearing as new psychoactive substances

Published: May 7, 2018

Author(s): Kieran R. Manchester, Peter D. Maskell, Laura Waters

Journal: Drug Testing and Analysis

Abstract The misuse of benzodiazepines as new psychoactive substances is an increasing problem around the world. Basic physicochemical and pharmacokinetic data is required on these substances to interpret and predict their effects upon humans. Experimental log D7.4, pKa and plasma protein binding values were determined for 11 benzodiazepines that have recently appeared as new psychoactive substances (3‐hydroxyphenazepam,...

Read More thumbnail image: Experimental versus theoretical log D 7_4  pK a and plasma protein binding values for benzodiazepines appearing as new psychoactive substances

Investigation of phenylbutazone and its metabolite oxyphenbutazone in horse meat products during years 2013–2017

Published: May 7, 2018

Author(s): Loredana Annunziata, Pierina Visciano, Arianna Stramenga, Maria Novella Colagrande, Guido Campana, Giampiero Scortichini, Giacomo Migliorati, Dario Compagnone

Journal: Drug Testing and Analysis

Abstract This study showed the results of a monitoring program aimed at detecting the fraudulent use of horse meat in samples collected in the framework of official controls during the years 2013–2017 after the so‐called horse meat scandal that caused a decreasing consumer confidence in the food industry, particularly in meat products. A total of 125 samples diversely distributed in the 5 years of monitoring were analyzed by...

Read More thumbnail image: Investigation of phenylbutazone and its metabolite oxyphenbutazone in horse meat products during years 20132017

Frequency‐dependent shear properties of annulus fibrosus and nucleus pulposus by magnetic resonance elastography

Published: May 4, 2018

Author(s): P.F. Beauchemin, P.V. Bayly, J.R. Garbow, J.L.S. Schmidt, R.J. Okamoto, F. Chériet, D. Périé

Journal: NMR in Biomedicine

Aging and degeneration are associated with changes in mechanical properties in the intervertebral disc, generating interest in the establishment of mechanical properties as early biomarkers for the degenerative cascade. Magnetic resonance elastography (MRE) of the intervertebral disc is usually limited to the nucleus pulposus, as the annulus fibrosus is stiffer and less hydrated. The objective of this work was to adapt high‐frequency...

Read More thumbnail image: Frequencydependent shear properties of annulus fibrosus and nucleus pulposus by magnetic resonance elastography

Errors in 1 H‐MRS estimates of brain metabolite concentrations caused by failing to take into account tissue‐specific signal relaxation

Published: May 4, 2018

Author(s): Charles Gasparovic, Hongji Chen, Paul G. Mullins

Journal: NMR in Biomedicine

Accurate measurement of brain metabolite concentrations with proton magnetic resonance spectroscopy (1H‐MRS) can be problematic because of large voxels with mixed tissue composition, requiring adjustment for differing relaxation rates in each tissue if absolute concentration estimates are desired. Adjusting for tissue‐specific metabolite signal relaxation, however, also requires a knowledge of the relative concentrations of the metabolite in gray...

Read More thumbnail image: Errors in 1 HMRS estimates of brain metabolite concentrations caused by failing to take into account tissuespecific signal relaxation

Highly efficient high‐performance liquid chromatographic separation of xylene isomers and phthalate acid esters on a homemade DUT‐67(Zr) packed column

Published: May 4, 2018

Author(s): Sha Chen, Xiao‐Xin Li, Fan Feng, Sumei Li, Jia‐Hui Han, Zi‐Yi Jia, Lun Shu, P. Somsundaran, Jian‐Rong Li

Journal: Journal of Separation Science

Abstract In this study, the baseline separations of xylene isomers and phthalate acid esters on a homemade DUT‐67(Zr) packed column were achieved, respectively. The high selectivity for xylene isomers and phthalate acid esters was obtained with the increase in temperature and decrease in the retention time. The hydrophobicity of xylene isomers and phthalate acid esters resulted in the different separation time on the DUT‐67(Zr)...

Read More thumbnail image: Highly efficient highperformance liquid chromatographic separation of xylene isomers and phthalate acid esters on a homemade DUT67Zr packed column

In situ growth of Zr‐based metal‐organic framework UiO‐66‐NH 2 for open‐tubular capillary electrochromatography

Published: May 4, 2018

Author(s): Pingxiu Tang, Rong Wang, Zilin Chen

Journal: ELECTROPHORESIS

Abstract The high stability and other properties of Zr(IV)‐based metal organic frameworks(MOFs) make it a promising choice for chromatographic separation, while the application in open‐tubular capillary electrochromatography (OT‐CEC) separation has not been explored yet. Herein, we report the first example of the in‐situ growth of UiO‐66‐NH2 onto the capillary for open‐tubular capillary electrochromatography. UiO‐66‐NH2 consists of ZrCl4 and...

Read More thumbnail image: In situ growth of Zrbased metalorganic framework UiO66NH 2 for opentubular capillary electrochromatography

Thiazole orange as an everyday replacement for ethidium bromide and costly DNA dyes for electrophoresis

Published: May 4, 2018

Author(s): Casey S. O'Neil, Jacie L. Beach, Todd D. Gruber

Journal: ELECTROPHORESIS

Abstract DNA gel electrophoresis is a standard tool of biochemistry and molecular biology laboratories. The common dye ethidium bromide suffers from toxicity concerns and requires the use of damaging ultraviolet light. We observe that exposing plasmid DNA to a UV transilluminator for only 1 s results in detectable loss of colonies following transformation, suggesting rapid accumulation of DNA damage. SYBR Safe, a commercial product,...

Read More thumbnail image: Thiazole orange as an everyday replacement for ethidium bromide and costly DNA dyes for electrophoresis

Computer simulation of the enantioselective separation of weak bases in an online capillary electrophoresis based microanalysis configuration comprising sulfated cyclodextrin as selector

Published: May 4, 2018

Author(s): Saara Mikkonen, Wolfgang Thormann

Journal: ELECTROPHORESIS

Abstract Computer simulation was utilized to characterize the electrophoretic processes occurring after reactant mixing in an online assay format used for monitoring the enantioselective N‐demethylation of ketamine to norketamine in the presence of highly sulfated γ‐cyclodextrin (HS‐γ‐CD). The incubated reaction mixture (at pH 7.4 and without chiral selector) is bracketed by a low pH BGE containing 2% HS‐γ‐CD as chiral selector, thereby ...

Read More thumbnail image: Computer simulation of the enantioselective separation of weak bases in an online capillary electrophoresis based microanalysis configuration comprising sulfated cyclodextrin as selector

Characterizing intra‐axonal water diffusion with direction‐averaged triple diffusion encoding MRI

Published: May 4, 2018

Author(s): Jens H. Jensen, Joseph A. Helpern

Journal: NMR in Biomedicine

For large diffusion weightings, the direction‐averaged diffusion MRI (dMRI) signal from white matter is typically dominated by the contribution of water confined to axons. This fact can be exploited to characterize intra‐axonal diffusion properties, which may be valuable for interpreting the biophysical meaning of diffusion changes associated with pathology. However, using just the classic Stejskal‐Tanner pulse sequence, it has proven...

Read More thumbnail image: Characterizing intraaxonal water diffusion with directionaveraged triple diffusion encoding MRI

Stability of two layers dielectric‐electrolyte microflow subjected to an alternating external electric field

Published: May 4, 2018

Author(s): Evgeny A. Demekhin, Georgy S. Ganchenko, Ekaterina V. Gorbacheva, Sakir Amiroudine

Journal: ELECTROPHORESIS

Abstract The stability of the electroosmotic flow of the two‐phase system electrolyte‐dielectric with a free interface in the microchannel under an external electric field is examined theoretically. The mathematical model includes the Nernst–Plank equations for the ion concentrations. The linear stability of the 1D nonstationary solution with respect to the small, periodic perturbations along the channel, is studied. Two types of...

Read More thumbnail image: Stability of two layers dielectricelectrolyte microflow subjected to an alternating external electric field

A simple, low‐cost and robust capillary zone electrophoresis method with capacitively coupled contactless conductivity detection for the routine determination of four selected penicillins in money‐constrained laboratories

Published: May 4, 2018

Author(s): Prasanta Paul, Cari Sänger‐van de Griend, Erwin Adams, Ann Schepdael

Journal: ELECTROPHORESIS

Abstract A simple and robust capillary zone electrophoresis method was developed and validated for the determination of amoxicillin and clavulanate, ampicillin, phenoxymethyl penicillin (Pen V) as well as flucloxacillin. Capacitively coupled contactless conductivity detection was employed as detection mode that makes CE a simple and economic tool for money‐constrained laboratories. The developed method is...

Read More thumbnail image: A simple lowcost and robust capillary zone electrophoresismethod with capacitively coupled contactless conductivity detection for the routine determination of four selected penicillins in moneyconstrained laboratories

The Long History of the Diverse Roles of Short ORFs: sPEPs in Fungi

Published: May 4, 2018

Author(s): Paige E. Erpf, James A. Fraser

Journal: PROTEOMICS

Abstract Since the completion of the genome sequence of the model eukaryote Saccharomyces cerevisiae, there have been significant advancements in the field of genome annotation, in no small part due to the availability of datasets that make large‐scale comparative analyses possible. As a result, since its completion there has been a significant change in annotated ORF size distribution in this first eukaryotic genome, especially in short ORFs...

Read More thumbnail image: The Long History of the Diverse Roles of Short ORFs sPEPs in Fungi
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