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Understanding metabolism of arginine in biological systems via MALDI imaging

Published: May 27, 2016

Author(s): Heather J. Walker, Chloe Steels, Lilias Bendell, Malcolm R. Clench, David J. Read, Duncan D. Cameron, Michael M. Burrell

Journal: PROTEOMICS

Arginine is an important amino acid but has been barely studied in plants. The little research that has been done indicates that the pathways of synthesis are similar to those found in animals and procaryotes. However little is known about the cellular and tissue localization of the amino acid in plants. The research reported in this paper was designed to examine whether MALDI‐MSI was sufficiently sensitive to examine the distribution of...

Read More thumbnail image: Understanding metabolism of arginine in biological systems via MALDI imaging

Parallel reaction monitoring using quadrupole‐Orbitrap mass spectrometer: Principle and applications

Published: May 27, 2016

Author(s): Adele Bourmaud, Sebastien Gallien, Bruno Domon

Journal: PROTEOMICS

Targeted mass spectrometry‐based approaches are nowadays widely used for quantitative proteomics studies and more recently have been implemented on high resolution/accurate mass (HRAM) instruments resulting in a considerable performance improvement. More specifically, the parallel reaction monitoring technique (PRM) performed on quadrupole‐Orbitrap mass spectrometers, leveraging the high resolution and trapping capabilities of the...

Read More thumbnail image: Parallel reaction monitoring using quadrupoleOrbitrap mass spectrometer Principle and applications

Imaging mass spectrometry: Molecular microscopy for the new age of biology and medicine

Published: May 27, 2016

Author(s): Richard M. Caprioli

Journal: PROTEOMICS

Imaging mass spectrometry provides a powerful tool for monitoring and discovery of molecular processes in the spatial domain in tissues for research and practical applications in both biology and medicine. This technology directly measures molecular compounds in tissues without the use of target‐specific reagents such as antibodies, is applicable to a wide variety of analytes, and can provide spatial resolutions below the single cell...

Read More thumbnail image: Imaging mass spectrometry Molecular microscopy for the new age of biology and medicine

Computational design and fabrication of core–shell magnetic molecularly imprinted polymer for dispersive micro‐solid‐phase extraction coupled with high‐performance liquid chromatography for the determination of rhodamine 6G

Published: May 27, 2016

Author(s): Jin Xie, Jie Xie, Jian Deng, Xiangfang Fang, Haiqing Zhao, Duo Qian, Hongjuan Wang

Journal: Journal of Separation Science

A novel core–shell magnetic nano‐adsorbent with surface molecularly imprinted polymer coating was fabricated and then applied to dispersive micro‐solid‐phase extraction followed by determination of rhodamine 6G using high‐performance liquid chromatography. The molecularly imprinted polymer coating was prepared by copolymerization of dopamine and m‐aminophenylboronic acid (functional monomers), in the presence of rhodamine 6G (template). The selection...

Read More thumbnail image: Computational design and fabrication of coreshell magnetic molecularly imprinted polymer for dispersive microsolidphase extraction coupled with highperformance liquid chromatography for the determination of rhodamine 6G

Enhancing resolution of free‐flow zone electrophoresis via a simple sheath‐flow sample injection

Published: May 27, 2016

Author(s): Ying Yang, Fan‐Zhi Kong, Ji Liu, Jun‐Min Li, Xiao‐Ping Liu, Guo‐Qing Li, Ju‐Fang Wang, Hua Xiao, Liu‐Yin Fan, Cheng‐Xi Cao, Shan Li

Journal: ELECTROPHORESIS

In this work, a simple and novel sheath‐flow sample injection method (SFSIM) is introduced to reduce the band broadening of free‐flow zone electrophoresis separation in newly developed self‐balance free‐flow electrophoresis instrument. A needle injector was placed in the center of the separation inlet, into which the BGE and sample solution were pumped simultaneously. BGE formed sheath flow outside the sample stream, resulting in less...

Read More thumbnail image: Enhancing resolution of freeflow zone electrophoresis via a simple sheathflow sample injection

Total ion chromatographic fingerprints combined with chemometrics and mass defect filter to predict antitumor components of Picrasma quassioids

Published: May 27, 2016

Author(s): Yuanyuan Shi, Hao Zhan, Liuyi Zhong, Fangrong Yan, Feng Feng, Wenyuan Liu, Ning Xie

Journal: Journal of Separation Science

A method of total ion chromatogram combined with chemometrics and mass defect filter was established for the prediction of active ingredients in Picrasma quassioides samples. The total ion chromatogram data of 28 batches were pretreated with wavelet transformation and correlation optimized warping to correct baseline drifts and retention time shifts. Then partial least squares regression was applied to construct a regression model to...

Read More thumbnail image: Total ion chromatographic fingerprints combined with chemometrics and mass defect filter to predict antitumor components of Picrasma quassioids

Preparation and application of magnetic molecularly imprinted nanoparticles for the selective extraction of osthole in Libanotis Buchtomensis herbal extract

Published: May 27, 2016

Author(s): Gaiyan He, Yuhai Tang, Yi Hao, Juan Shi, Ruixia Gao

Journal: Journal of Separation Science

In this work, novel magnetic molecularly imprinted polymers were prepared for the selective extraction of osthole from Libanotis Buchtomensis herbal extract. During the synthesis process, double bonds grafted on the surface of Fe3O4 nanoparticles could not only drive the temple molecules to locate onto the surface of vinyl‐functionalized magnetic nanoparticles by π–π conjugation, which makes the distribution of binding sites ordered, but also direct the...

Read More thumbnail image: Preparation and application of magnetic molecularly imprinted nanoparticles for the selective extraction of osthole in Libanotis Buchtomensis herbal extract

Novel Zn‐based MOFs stationary phase with large pores for capillary electrochromatography

Published: May 27, 2016

Author(s): Pingxiu Tang, Tao Bao, Zilin Chen

Journal: ELECTROPHORESIS

Metal‐organic frameworks (MOFs) are attractive stationary phases in the field of separation sciences for their unique properties such as large specific surface areas, high porosity, and diverse structures. However, there are few MOFs, which have ultrahigh porosities and gas uptake capacities. In this work, MOF‐180 with exceptional porosity, a cage size of 15 × 23 Å, was grown on inner wall of capillary as a novel stationary phase for...

Read More thumbnail image: Novel Znbased MOFs stationary phase with large pores for capillary electrochromatography

Ionic‐liquid‐based dispersive liquid–liquid microextraction coupled with high‐performance liquid chromatography for the forensic determination of methamphetamine in human urine

Published: May 27, 2016

Author(s): Ruifeng Wang, Xiujuan Qi, Lei Zhao, Shimin Liu, Shuang Gao, Xiangyuan Ma, Youquan Deng

Journal: Journal of Separation Science

Determination of methamphetamine in forensic laboratories is a major issue due to its health and social harm. In this work, a simple, sensitive, and environmentally friendly method based on ionic liquid dispersive liquid–liquid microextraction combined with high‐performance liquid chromatography was established for the analysis of methamphetamine in human urine. 1‐Octyl‐3‐methylimidazolium hexafluorophosphate with the help of...

Read More thumbnail image: Ionicliquidbased dispersive liquidliquid microextraction coupled with highperformance liquid chromatography for the forensic determination of methamphetamine in human urine

Variation in the chromatographic, material, and chemical characteristics of methacrylate‐based polymer monoliths during photoinitiated low‐temperature polymerization

Published: May 27, 2016

Author(s): Ayumi Kobayashi, Takuya Nakaza, Tomohiko Hirano, Shinya Kitagawa, Hajime Ohtani

Journal: Journal of Separation Science

Both the separation behavior and the structure of a polymer monolith column depends on both the reaction solution composition and the polymerization conditions. In photoinitiated low‐temperature polymerization, polymerization temperature, irradiation intensity, and polymerization time were key factors to control the monolith characteristics. In this study, the effect of polymerization time on the chromatographic, material, and chemical...

Read More thumbnail image: Variation in the chromatographic material and chemical characteristics of methacrylatebased polymer monoliths during photoinitiated lowtemperature polymerization

Potential dependent thiocyanate adsorption on gold electrodes: a comparison study between SERS and SHINERS

Published: May 27, 2016

Author(s): Gema Cabello, Xue‐Jiao Chen, Rajapandiyan Panneerselvam, Zhong‐Qun Tian

Journal: Journal of Raman Spectroscopy

Potential dependent adsorption of target molecules on electrode surface has long been analyzed by several analytical techniques at the electrochemical interfaces. Here, the adsorption of thiocyanate (SCN−) on gold electrodes [Au (111) and Au (poly)] is investigated by electrochemical shell isolated nanoparticle‐enhanced Raman spectroscopy (EC‐SHINERS) and surface‐enhanced Raman spectroscopy. Based on the experimental observation, C − N stretching ...

Read More thumbnail image: Potential dependent thiocyanate adsorption on gold electrodes a comparison study between SERS and SHINERS

Portable and Raman imaging usefulness to detect decaying on mortars from Punta Begoña Galleries (Getxo, North of Spain)

Published: May 27, 2016

Author(s): Cristina García‐Florentino, Maite Maguregui, Héctor Morillas, Urko Balziskueta, Agustin Azcarate, Gorka Arana, Juan Manuel Madariaga

Journal: Journal of Raman Spectroscopy

Punta Begoña Galleries were built in 1918 in Getxo (Basque Country, North of Spain) but were abandoned in 1960. Nowadays, their conservation state is very poor. In this work, portable Raman spectroscopy was applied to evaluate the original composition and possible deterioration products of the mortars used in the inner walls and those covering the concrete of the ceilings allowing us to select the most appropriate sampling points. In the...

Read More thumbnail image: Portable and Raman imaging usefulness to detect decaying on mortars from Punta Begona Galleries Getxo North of Spain

Raman spectral probe on increased local vibrational modes and phonon lifetimes in Ho 3+ ‐doped Bi 2 O 3 micro‐rods

Published: May 27, 2016

Author(s): Neena Prasad, Karthikeyan Balasubramanian

Journal: Journal of Raman Spectroscopy

We report the appearance and enhancement in intensity of impurity related local vibrational modes in Bi2O3 : Ho micro‐rods along with normal modes. Pure and Ho‐doped Bi2O3 micro‐rods were synthesized by conventional co‐precipitation method at 60 °C. The structural and morphological studies were carried out using powder X‐ray diffraction technique and scanning electron microscopy, respectively. Raman spectroscopic studies reveal the existence of local...

Read More thumbnail image: Raman spectral probe on increased local vibrational modes and phonon lifetimes in Ho 3 doped Bi 2 O 3 microrods

Plasmon‐driven catalysis in aqueous solutions probed by SERS spectroscopy

Published: May 27, 2016

Author(s): Lin Cui, Xin Ren, Xianzhong Yang, Peijie Wang, Yingqi Qu, Wenjie Liang, Mengtao Sun

Journal: Journal of Raman Spectroscopy

Since 2010, the plasmon‐driven catalysis using surface‐enhanced Raman spectroscopy (SERS) in atmospheric environment has been experimentally reported. Recent experimental results since 2014 revealed that catalysis under aqueous condition is much better than that in atmospheric environment. In this paper, we review plasmon‐driven catalysis using SERS under aqueous condition. First, the experimental apparatus developed by ourselves is...

Read More thumbnail image: Plasmondriven catalysis in aqueous solutions probed by SERS spectroscopy

Temperature‐dependent Raman spectroscopic studies of microstructure present in dipotassium molybdate crystals and their melts

Published: May 27, 2016

Author(s): Min Wang, Jinglin You, A. A. Sobol, Jian Wang, Jun Wu, Xiumei Lv

Journal: Journal of Raman Spectroscopy

Temperature‐dependent Raman spectra of K2MonO3n+1 (n = 1, 2, 3) crystals up to and above their melting points were recorded, and their vibration modes in solid and molten states were assigned. Basic structural units and the corresponding cluster forms in molten dipotassium monomolybdates, dimolybdates, and trimolybdates were studied by in situ high‐temperature Raman spectroscopic studies together with theoretical calculations, including density...

Read More thumbnail image: Temperaturedependent Raman spectroscopic studies of microstructure present in dipotassium molybdate crystals and their melts

Statistical design, structural analysis, and in vitro susceptibility assay of antimicrobial peptoids to combat bacterial infections

Published: May 27, 2016

Author(s): He Lin, Tingting Yan, Lei Wang, Fangfang Guo, Guansen Ning, Meng Xiong

Journal: Journal of Chemometrics

Abstract Antimicrobial peptoids (ampetoids) have been established as a new and attractive class of antibiotic agent to combat bacterial infections with high bioavailability, strong metabolic stability, and low in vivo toxicity. Here, we reported successful design of short ampetoids by integrating chemometrics/cheminformatics techniques and in vitro susceptibility test. In the procedure, a novel panel of natural and N‐substituted amino acid...

Read More thumbnail image: Statistical design structural analysis and in vitro susceptibility assay of antimicrobial peptoids to combat bacterial infections

Novel cationic coating agent for protein separation by capillary electrophoresis

Published: May 27, 2016

Author(s): Joanna Znaleziona, Dušan Drahoňovský, Bohuslav Drahoš, Juraj Ševčík, Vítězslav Maier

Journal: Journal of Separation Science

A novel positively charged surfactant N‐dodecyl‐N,N‐dimethyl‐(1,2‐propandiol) ammonium chloride was used for the dynamic coating of the inner wall of a silica capillary. This paper covers the evaluation of dynamic coating and study of the influence of the analysis conditions for the magnitude and direction of electroosmotic flow as well as for the effective and selective separation of chosen proteins (ribonuclease A, cytochrome c,...

Read More thumbnail image: Novel cationic coating agent for protein separation by capillary electrophoresis

Spondias tuberosa (Anacardiaceae) leaves: profiling phenolic compounds by HPLC‐DAD and LC–MS/MS and in vivo anti‐inflammatory activity

Published: May 27, 2016

Author(s): Emerson Michell Silva Siqueira, Juliana Félix‐Silva, Lorena Maria Lima Araújo, Julia Morais Fernandes, Bárbara Cabral, Jacyra Antunes dos Santos Gomes, Alan Araújo Roque, José Carlos Tomaz, Norberto Peporine Lopes, Matheus Freitas Fernandes‐Pedrosa, Raquel Brandt Giordani, Silvana Maria Zucolotto

Journal: Biomedical Chromatography

Abstract Spondias tuberosa is a medicinal plant used by several local communities in northeast Brazil to treat infections, digestive disorders and inflammatory conditions. The study aimed to identify and quantify the major phenolic in hydroethanolic extract of leaves from S. tuberosa and to evaluate its anti‐inflammatory potential. The chemical profile of extract was analyzed by HPLC‐DAD and HPLC–MS. The in vivo anti‐inflammatory activity was...

Read More thumbnail image: Spondias tuberosa Anacardiaceae leaves profiling phenolic compounds by HPLCDAD and LCMSMS and in vivo antiinflammatory activity

Flow‐modulated targeted signal enhancement for volatile organic compounds

Published: May 27, 2016

Author(s): Taylor Hayward, Ronda Gras, Jim Luong

Journal: Journal of Separation Science

Comprehensive two‐dimensional gas chromatography is a technique that is becoming more widespread within the analytical community, especially in the separation of complex mixtures. Modulation in comprehensive two‐dimensional gas chromatography can be achieved by manipulating temperature or flow and offers many advantages such as increased separation power, but one underutilized advantage is increased detectability due to the reduction of...

Read More thumbnail image: Flowmodulated targeted signal enhancement for volatile organic compounds
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