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Comparative chemometric analysis for classification of acids and bases via a colorimetric sensor array

Published: Oct 13, 2017

Author(s): Michael J. Kangas, Raychelle M. Burks, Jordyn Atwater, Rachel M. Lukowicz, Billy Garver, Andrea E. Holmes

Journal: Journal of Chemometrics

Abstract With the increasing availability of digital imaging devices, colorimetric sensor arrays are rapidly becoming a simple, yet effective tool for the identification and quantification of various analytes. Colorimetric arrays utilize colorimetric data from many colorimetric sensors, with the multidimensional nature of the resulting data necessitating the use of chemometric analysis. Herein, an 8 sensor colorimetric array was...

Read More thumbnail image: Comparative chemometric analysis for classification of acids and bases via a colorimetric sensor array

Accurate model based on artificial intelligence for prediction of carbon dioxide solubility in aqueous tetra‐ n ‐butylammonium bromide solutions

Published: Oct 13, 2017

Author(s): Seyed‐Ahmad Hoseinpour, Ali Barati‐Harooni, Payam Nadali, Armin Mohebbi, Adel Najafi‐Marghmaleki, Afshin Tatar, Alireza Bahadori

Journal: Journal of Chemometrics

Abstract This study highlights the application of radial basis function (RBF) neural networks, adaptive neuro‐fuzzy inference systems (ANFIS), and gene expression programming (GEP) in the estimation of solubility of CO2 in aqueous solutions of tetra‐n‐butylammonium bromide (TBAB). The experimental data were gathered from a published work in literature. The proposed RBF network was coupled with genetic algorithm (GA) to access a better...

Read More thumbnail image: Accurate model based on artificial intelligence for prediction of carbon dioxide solubility in aqueous tetra n butylammonium bromide solutions

Autotransporter Adhesins in Escherichia coli Pathogenesis

Published: Oct 12, 2017

Author(s): Julieanne L. Vo, Gabriela Constanza Martínez Ortiz, Pramod Subedi, Shivakumar Keerthikumar, Suresh Mathivanan, Jason J. Paxman, Begoña Heras

Journal: PROTEOMICS

Abstract Most bacteria produce adhesion molecules to facilitate the interaction with host cells and establish successful infections. An important group of bacterial adhesins belong to the autotransporter (AT) superfamily, the largest group of secreted and outer membrane proteins in Gram‐negative bacteria. AT adhesins possess diverse functions that facilitate bacterial colonisation, survival and persistence, and as such are often...

Read More thumbnail image: Autotransporter Adhesins in Escherichia coli Pathogenesis

Small but Mighty: Functional Peptides Encoded by Small ORFs in Plants

Published: Oct 12, 2017

Author(s): Polly Yingshan Hsu, Philip N. Benfey

Journal: PROTEOMICS

Abstract Peptides encoded by small open reading frames (sORFs, usually <100 codons) play critical regulatory roles in plant development and environmental responses. Despite their importance, only a small number of these peptides have been identified and characterized. Genomic studies have revealed that many plant genomes contain thousands of possible sORFs, which could potentially encode small peptides. The challenge is to...

Read More thumbnail image: Small but Mighty Functional Peptides Encoded by Small ORFs in Plants

Proteomic Response of Human Umbilical Vein Endothelial Cells to Histamine Stimulation

Published: Oct 12, 2017

Author(s): Pelin Esma Emirbayer, Ankit Sinha, Vladimir Ignatchenko, Stefanie Hoyer, Jan Dörrie, Niels Schaft, Monika Pischetsrieder, Thomas Kislinger

Journal: PROTEOMICS

Abstract The histamine receptors (HRs) represent a subclass of G protein‐coupled receptors (GPCRs) and comprise four subtypes. Due to their numerous physiological and pathological effects, HRs are popular drug targets for the treatment of allergic reactions or the regulation of gastric acid secretion. Hence, an understanding of the functional selectivity of HR ligands has gained importance. These ligands can bind to specific GPCRs...

Read More thumbnail image: Proteomic Response of Human Umbilical Vein Endothelial Cells to Histamine Stimulation

A two‐step method for rapid characterization of electroosmotic flows in capillary electrophoresis

Published: Oct 12, 2017

Author(s): Wenjing Zhang, Muyi He, Tao Yuan, Wei Xu

Journal: ELECTROPHORESIS

Abstract The measurement of electroosmotic flow (EOF) is important in a capillary electrophoresis (CE) experiment in terms of performance optimization and stability improvement. Although several methods exist, there are demanding needs to accurately characterize ultra‐low electroosmotic flow rates (EOF rates), such as in coated capillaries used in protein separations. In this work, a new method, called the two‐step method, was...

Read More thumbnail image: A twostep method for rapid characterization of electroosmotic flows in capillary electrophoresis

Modeling and predicting the solute polarity parameter in reversed‐phase liquid chromatography using quantitative structure–property relationship approaches

Published: Oct 12, 2017

Author(s): Hassan Golmohammadi, Zahra Dashtbozorgi, Sajad Khooshechin

Journal: Journal of Separation Science

Abstract A prediction of quantitative structure–property relationships is developed to model the polarity parameter of a set of 146 organic compounds in acetonitrile in reversed‐phase liquid chromatography. Enhanced replacement method and support vector machine regressions were employed to build prediction models based on molecular descriptors calculated from the structure alone. The correlation coefficients between experimental and...

Read More thumbnail image: Modeling and predicting the solute polarity parameter in reversedphase liquid chromatography using quantitative structureproperty relationship approaches

Qualitative and quantitative analysis of chemical constituents in Ardisiae Japonicae Herba

Published: Oct 11, 2017

Author(s): Ke‐Yun Yu, Wen Gao, Shang‐Zhen Li, Wei Wu, Pei Li, Li‐Li Dou, Yuan‐Zhong Wang, E‐Hu Liu

Journal: Journal of Separation Science

Abstract Ardisiae Japonicae Herba is a well‐known traditional Chinese medicine for the treatment of bronchitis conjunctivitis, pneumonia, and trauma. In this work, a high‐performance liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry method was first established for the separation and structural identification of the chemical constituents in Ardisiae Japonicae Herba. A total of 15 compounds including...

Read More thumbnail image: Qualitative and quantitative analysis of chemical constituents in Ardisiae Japonicae Herba

Combined endogenous MR biomarkers to predict basal tumor oxygenation and response to hyperoxic challenge

Published: Oct 11, 2017

Author(s): Thanh‐Trang Cao‐Pham, Nicolas Joudiou, Matthias Van Hul, Caroline Bouzin, Patrice D. Cani, Bernard Gallez, Bénédicte F. Jordan

Journal: NMR in Biomedicine

Hypoxia is a common feature of solid tumors, which translates into increased angiogenesis, malignant phenotype cell selection, change in gene expression and greater resistance to radiotherapy and chemotherapy. Therefore, there is a need for markers of hypoxia to stratify patients, in order to personalize treatment to improve therapeutic outcome. However, no modality has yet been validated for the screening of hypoxia in routine clinical...

Read More thumbnail image: Combined endogenous MR biomarkers to predict basal tumor oxygenation and response to hyperoxic challenge

Ultrafine grain formation and coating mechanism arising from a blast coating process: A transmission electron microscopy analysis

Published: Oct 11, 2017

Author(s): Conor F. Dunne, Kevin Roche, Arne Janssen, Xiangli Zhong, M.G. Burke, Barry Twomey, Kenneth T. Stanton

Journal: Surface and Interface Analysis

This article examines the substrate/coating interface of a coating deposited onto mild steel and stainless steel substrates using an ambient temperature blast coating technique known as CoBlast. The process uses a coincident stream of an abrasive blast medium and coating medium particles to modify the substrate surface. The hypothesis for the high bond strength is that the abrasive medium roughens the surface while simultaneously...

Read More thumbnail image: Ultrafine grain formation and coating mechanism arising from a blast coating process A transmission electron microscopy analysis

Effect of thicknesses of InP epilayers on InP/GaAs heterostructure

Published: Oct 11, 2017

Author(s): Jingjuan Li, Zuoxing Guo, Liang Zhao, Zhengquan Jia, Min Zhang, Lei Zhao

Journal: Surface and Interface Analysis

InP epilayers with different thicknesses were grown on GaAs substrates at a low temperature by using metalorganic chemical vapor deposition. Atom force microscope and double‐crystal X‐ray were carried out to investigate the morphology and the crystal quality. Transmission electron microscopy was performed to characterize the microstructure and morphology. It was found that with the epilayer thicknesses increased, the crystal quality was...

Read More thumbnail image: Effect of thicknesses of InP epilayers on InPGaAs heterostructure

Small Proteins Encoded by Unannotated ORFs are Rising Stars of the Proteome, Confirming Shortcomings in Genome Annotations and Current Vision of an mRNA

Published: Oct 11, 2017

Author(s): Vivian Delcourt, Antanas Staskevicius, Michel Salzet, Isabelle Fournier, Xavier Roucou

Journal: PROTEOMICS

Abstract Short ORF‐encoded peptides and small proteins in eukaryotes have been hiding in the shadow of large proteins for a long time. Recently, improved identifications in MS‐based proteomics and ribosome profiling resulted in the detection of large numbers of small proteins. The variety of functions of small proteins is also emerging. It seems to be the right time to reflect on why small proteins remained invisible. In addition to...

Read More thumbnail image: Small Proteins Encoded by Unannotated ORFs are Rising Stars of the Proteome Confirming Shortcomings in Genome Annotations and Current Vision of an mRNA

Monitoring of transferrin isoforms in biological samples by capillary electrophoresis

Published: Oct 10, 2017

Author(s): Jitka Caslavska, Wolfgang Thormann

Journal: Journal of Separation Science

Abstract Work dealing with the monitoring of transferrin isoforms in human serum and other body fluids by capillary electrophoresis is reviewed. It comprises capillary zone electrophoresis and capillary isoelectric focusing efforts that led to the exploration and use of assays for the determination of carbohydrate‐deficient transferrin as a marker for excessive alcohol intake, genetic variants of transferrin, congenital disorders of...

Read More thumbnail image: Monitoring of transferrin isoforms in biological samples by capillary electrophoresis

Strategies for analysis of isomeric peptides

Published: Oct 10, 2017

Author(s): Erik T. Jansson

Journal: Journal of Separation Science

Abstract This review presents an overview and recent progress of strategies for detecting isomerism in peptides, with focus on d/l epimerization and the various isomers that the presence of an aspartic acid residue may yield in a protein or peptide. While mass spectrometry has become a majorly used method of choice within proteomics, isomerism is inherently difficult to analyze because it is a modification that does not yield any change in mass...

Read More thumbnail image: Strategies for analysis of isomeric peptides

Performance comparison of dispersive solid‐phase extraction and multiplug filtration cleanup methods for the determination of tefuryltrione in plant and environmental samples using UHPLC–MS/MS

Published: Oct 10, 2017

Author(s): Yang Yu, Yan Tao, Fengshou Dong, Jun Xu, Xingang Liu, Xiaohu Wu, Mingshan Ji, Yongquan Zheng

Journal: Journal of Separation Science

Abstract The detection frequencies of tefuryltrione, a new type of 4‐hydroxyphenyl‐pyruvate dioxygenase inhibitor herbicide, are rarely reported, probably because of the paucity of analytical methods. Herein, an effective and sensitive analytical method has been developed to detect tefuryltrione in vegetables (tomato and cucumber), cereals (rice and corn), soil, and water by ultra high performance liquid chromatography coupled with...

Read More thumbnail image: Performance comparison of dispersive solidphase extraction and multiplug filtration cleanup methods for the determination of tefuryltrione in plant and environmental samples using UHPLCMSMS

Precise control of agarose media pore structure by regulating cooling rate

Published: Oct 10, 2017

Author(s): Chao Chen, Xiunan Li, Dawei Zhao, Yaqiong Li, Hong Shi, Guanghui Ma, Zhiguo Su

Journal: Journal of Separation Science

Abstract A porous structure is the key factor to successful chromatography separation. Agarose gel as one of the most popular porous media has been extensively used in chromatography separation. As the cooling process in the agarose gelation procedure can directly influence the pore structure, ten kinds of 4% agarose media with different cooling rates from 0.132 to 16.7°C/min were synthesized, and the pore structure was determined...

Read More thumbnail image: Precise control of agarose media pore structure by regulating cooling rate

Development of a simple and valid method for the trace determination of phthalate esters in human plasma using dispersive liquid–liquid microextraction coupled with gas chromatography–mass spectrometry

Published: Oct 10, 2017

Author(s): Karim Ebrahim, Parinaz Poursafa, Mohammad Mehdi Amin

Journal: Journal of Separation Science

Abstract A new method was developed for the trace determination of phthalic acid esters in plasma using dispersive liquid–liquid microextraction and gas chromatography with mass spectrometry analysis. Plasma proteins were efficiently precipitated by trichloroacetic acid and then a mixture of chlorobenzene (as extraction solvent) and acetonitrile (as dispersive solvent) rapidly injected to clear supernatant using a syringe. After...

Read More thumbnail image: Development of a simple and valid method for the trace determination of phthalate esters in human plasma using dispersive liquidliquid microextraction coupled with gas chromatographymass spectrometry

Non‐targeted volatile profiles for the classification of the botanical origin of Chinese honey by solid‐phase microextraction and gas chromatography–mass spectrometry combined with chemometrics

Published: Oct 10, 2017

Author(s): Hui Chen, Linghe Jin, Chunlin Fan, Wenwen Wang

Journal: Journal of Separation Science

Abstract A potential method for the discrimination and prediction of honey samples of various botanical origins was developed based on the non‐targeted volatile profiles obtained by solid‐phase microextraction with gas chromatography and mass spectrometry combined with chemometrics. The blind analysis of non‐targeted volatile profiles was carried out using solid‐phase microextraction with gas chromatography and mass spectrometry for...

Read More thumbnail image: Nontargeted volatile profiles for the classification of the botanical origin of Chinese honey by solidphase microextraction and gas chromatographymass spectrometry combined with chemometrics

Optimization of the ultrasound‐assisted extraction of antioxidant phloridzin from Lithocarpus polystachyus Rehd. using response surface methodology

Published: Oct 10, 2017

Author(s): Yang Chen, Li‐Zi Yin, Ling Zhao, Gang Shu, Zhi‐Xiang Yuan, Hua‐Lin Fu, Cheng Lv, Ju‐Chun Lin

Journal: Journal of Separation Science

Abstract The purpose of this study was to optimize the extraction process of phloridzin from Lithocarpus polystachyus Rehd. leaves using response surface methodology and to determine the antioxidant capacity of the extract. A Box–Behnken design was used to analyze the effects of ethanol concentration, liquid–solid ratio, soak time and extraction time on the extraction yield of phloridzin. The content of phloridzin was determined by...

Read More thumbnail image: Optimization of the ultrasoundassisted extraction of antioxidant phloridzin from Lithocarpus polystachyus Rehd_ using response surface methodology

Manifestations of classical physics in the quantum evolution of correlated spin states in pulsed NMR experiments

Published: Oct 10, 2017

Author(s): Martin Ligare

Journal: Concepts in Magnetic Resonance Part A

Abstract Multiple‐pulse NMR experiments are a powerful tool for the investigation of molecules with coupled nuclear spins. The product operator formalism provides a way to understand the quantum evolution of an ensemble of weakly coupled spins in such experiments using some of the more intuitive concepts of classical physics and semi‐classical vector representations. In this paper I present a new way in which to interpret the...

Read More thumbnail image: Manifestations of classical physics in the quantum evolution of correlated spin states in pulsed NMR experiments
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