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An improved plant‐wide fault detection scheme based on PCA and adaptive threshold for reliable process monitoring: Application on the new revised model of Tennessee Eastman process

Published: Dec 1, 2017

Author(s): Azzeddine Bakdi, Abdelmalek Kouadri

Journal: Journal of Chemometrics

Abstract An improved process monitoring scheme is presented in this paper, it is based on the integration of multivariate and univariate statistical analysis methods. Instead of conventional fixed control limits, adaptive thresholds are developed for common fault detection indices used with principal component analysis, including the Hotelling T2 statistic and the sum of squared prediction error known as the Q statistic. The thresholds are...

Read More thumbnail image: An improved plantwide fault detection scheme based on PCA and adaptive threshold for reliable process monitoring Application on the new revised model of Tennessee Eastman process

Group‐wise partial least square regression

Published: Dec 1, 2017

Author(s): José Camacho, Edoardo Saccenti

Journal: Journal of Chemometrics

Abstract This paper introduces the group‐wise partial least squares (GPLS) regression. GPLS is a new sparse PLS technique where the sparsity structure is defined in terms of groups of correlated variables, similarly to what is done in the related group‐wise principal component analysis. These groups are found in correlation maps derived from the data to be analyzed. GPLS is especially useful for exploratory data analysis, because...

Read More thumbnail image: Groupwise partial least square regression

Determination of cannabinoids from a surrogate hops matrix using multiple reaction monitoring gas chromatography with triple quadrupole mass spectrometry

Published: Dec 1, 2017

Author(s): Allegra Leghissa, Zacariah L. Hildenbrand, Frank W. Foss, Kevin A. Schug

Journal: Journal of Separation Science

Abstract Cannabinoids are the primary bioactive constituents of Cannabis sativa and Cannabis indica plants. In this work, gas chromatography in conjunction with triple quadrupole mass spectrometry in multiple reaction monitoring mode was explored for determination of cannabinoids from a surrogate hops matrix. Gas chromatography with mass spectrometry is a reasonable choice for the analysis of these compounds; however, such methods are...

Read More thumbnail image: Determination of cannabinoids from a surrogate hops matrix using multiple reaction monitoring gas chromatography with triple quadrupole mass spectrometry

CE method for analyzing Salmonella typhimurium in water samples

Published: Dec 1, 2017

Author(s): Cristina Arce, Panji Cahya‐Mawarda, Natalia Arroyo‐Manzanares, Juan J. Garrido, Lourdes Arce

Journal: Journal of Separation Science

Abstract Salmonella typhimurium is commonly described as a food‐borne pathogen. However, natural and drinking water are known to be important sources for the transmission of this pathogen in developing and developed countries. The standard method to determine Salmonella is laborious and many false positives are detected. To solve this, the present work was focused on the development of a capillary zone electrophoresis method coupled to...

Read More thumbnail image: CE method for analyzing Salmonella typhimurium in water samples

Dispersive micro‐solid‐phase extraction combined with online preconcentration by capillary electrophoresis for the determination of glycopyrrolate stereoisomers in rat plasma

Published: Dec 1, 2017

Author(s): Yongjing Liu, Lishuang Yu, Hua Zhang, Dawei Chen

Journal: Journal of Separation Science

Abstract A simple and sensitive analytical method for four isomers of glycopyrrolate in rat plasma was developed using cation‐selective exhaustive injection‐sweeping cyclodextrin‐modified electrokinetic chromatography (CSEI‐Sweeping‐CDEKC) for online enrichment combined with dispersive micro‐solid‐phase extraction pretreatment. The CSEI‐Sweeping‐CDEKC was conducted on an uncoated fused silica capillary (40.2 cm × 75 μm) with an...

Read More thumbnail image: Dispersive microsolidphase extraction combined with online preconcentration by capillary electrophoresis for the determination of glycopyrrolate stereoisomers in rat plasma

Quality evaluation of raw and processed Crataegi Fructus by color measurement and fingerprint analysis

Published: Dec 1, 2017

Author(s): Chenghao Fei, Hui Dai, Xiaoyan Wu, Lin Li, Tulin Lu, Weidong Li, Baochang Cai, Wu Yin, Fangzhou Yin

Journal: Journal of Separation Science

Abstract Crataegi Fructus and its processed products have been used as a traditional medicine for a long time, and numerous active components are responsible for their curative effects. However, a comprehensive and fast method for the quality control of its processed products is still lacking. In this study, two analytical methods based on color measurements and fingerprint analysis are established. In the color measurements, the...

Read More thumbnail image: Quality evaluation of raw and processed Crataegi Fructus by color measurement and fingerprint analysis

Facile and versatile strategy to prepare magnetic molecularly imprinted particles based on the coassembly of magnetic nanoparticles and amphiphilic random copolymers

Published: Nov 30, 2017

Author(s): Lili Zhu, Yuhua Cao, Xinjiong Ni, Aimei You, Guangqun Cao

Journal: Journal of Separation Science

Abstract Magnetic molecularly imprinted polymer nanoparticles for bisphenol A were prepared by coassembling magnetic nanoparticles and amphiphilic random copolymers. Under optimized conditions, bisphenol A as template molecules, magnetic molecularly imprinted polymer particles with regular morphology, small size, good monodispersity, and high content of OA‐Fe3O4 were prepared by the coassembly method using P(MMA‐co‐MAA) with monomer ratio of...

Read More thumbnail image: Facile and versatile strategy to prepare magnetic molecularly imprinted particles based on the coassembly of magnetic nanoparticles and amphiphilic random copolymers

Validated thin‐layer chromatographic method for the identification and monitoring of the effect of the extraction method on the yield and phytochemical constituents of Egyptian Withania somnifera leaves

Published: Nov 30, 2017

Author(s): Rahma S. R. Mahrous, Hoda M. Fathy, Rasha M. Abu EL‐Khair, Abdallah A. Omar

Journal: Journal of Separation Science

Abstract A sensitive, reliable, simple and rapid thin‐layer chromatographic method has been developed for routine analysis of withanolide S content for the purpose of quality control assessment of chemotype III of Withania somnifera. The new method was used first to compare the accumulation of withanolide S in different parts of the plant, which was found to be the highest in the leaves extract (0.21% w/w). Second, to investigate different...

Read More thumbnail image: Validated thinlayer chromatographic method for the identification and monitoring of the effect of the extraction method on the yield and phytochemical constituents of Egyptian Withania somnifera leaves

In vitro screening and isolation of human aromatase inhibitors from Cicer arietinum by a novel continuous online method combining chromatographic techniques

Published: Nov 30, 2017

Author(s): Yuchi Zhang, Yan He, Chengyu Liu, Chunming Liu, Sainan Li

Journal: Journal of Separation Science

Abstract Ultrafiltration liquid chromatography with mass spectrometry can efficiently and rapidly screen and identify ligands from the seeds of Cicer arietinum for human aromatase. Using this method, we identified 11 major compounds, including organic acids, organic acid glycosides, flavone glycosides, isoflavones, and isoflavone glycosides, as potent human aromatase inhibitors. A continuous online method, including pressurized...

Read More thumbnail image: In vitro screening and isolation of human aromatase inhibitors from Cicer arietinum by a novel continuous online method combining chromatographic techniques

Simultaneous determination and pharmacokinetic study of giraldoid a, giraldoid B in rat plasma after oral administration of Daphne giraldii Nitsche extracts by LC–MS/MS

Published: Nov 30, 2017

Author(s): Huyiligeqi, Xiaoxv Dong, Jing Fu, Sali Cao, Chunjing Yang, Longtai You, Zhongyi Zhang, Jian Ni

Journal: Biomedical Chromatography

Abstract A simple sensitive LC–MS/MS method has been developed for the simultaneous determination of giraldoid A and giraldoid B in rat plasma. The method was applied to pharmacokinetics studies of the two compounds from Daphne giraldii Nitsche. Chromatographic separation was accomplished on an Acquity UPLC™ BEH C18 column (100 × 2.1 mm, 1.7 mm) by gradient elution with a flow rate of 0.2 mL min−1. The method was linear over the concentration range of...

Read More thumbnail image: Simultaneous determination and pharmacokinetic study of giraldoid a giraldoid B in rat plasma after oral administration of Daphne giraldii Nitsche extracts by LCMSMS

Characterization of glioblastoma in an orthotopic mouse model with magnetic resonance elastography

Published: Nov 29, 2017

Author(s): Katharina Schregel, Navid Nazari, Michal O. Nowicki, Miklos Palotai, Sean E. Lawler, Ralph Sinkus, Paul E. Barbone, Samuel Patz

Journal: NMR in Biomedicine

Glioblastoma (GBM) is the most common primary brain tumor. It is highly malignant and has a correspondingly poor prognosis. Diagnosis and monitoring are mainly accomplished with MRI, but remain challenging in some cases. Therefore, complementary methods for tumor detection and characterization would be beneficial. Using magnetic resonance elastography (MRE), we performed a longitudinal study of the biomechanical properties of...

Read More thumbnail image: Characterization of glioblastoma in an orthotopic mouse model with magnetic resonance elastography

Cardiovascular magnetic resonance elastography: A review

Published: Nov 29, 2017

Author(s): Saad Khan, Faisal Fakhouri, Waqas Majeed, Arunark Kolipaka

Journal: NMR in Biomedicine

Cardiovascular diseases are the leading cause of death worldwide. These cardiovascular diseases are associated with mechanical changes in the myocardium and aorta. It is known that stiffness is altered in many diseases, including the spectrum of ischemia, diastolic dysfunction, hypertension and hypertrophic cardiomyopathy. In addition, the stiffness of the aortic wall is altered in multiple diseases, including hypertension, coronary...

Read More thumbnail image: Cardiovascular magnetic resonance elastography A review

Imaging brain microstructure with diffusion MRI: practicality and applications

Published: Nov 29, 2017

Author(s): Daniel C. Alexander, Tim B. Dyrby, Markus Nilsson, Hui Zhang

Journal: NMR in Biomedicine

This article gives an overview of microstructure imaging of the brain with diffusion MRI and reviews the state of the art. The microstructure‐imaging paradigm aims to estimate and map microscopic properties of tissue using a model that links these properties to the voxel scale MR signal. Imaging techniques of this type are just starting to make the transition from the technical research domain to wide application in biomedical studies. We...

Read More thumbnail image: Imaging brain microstructure with diffusion MRI practicality and applications

Current challenges in second‐order calibration of hyphenated chromatographic data for analysis of highly complex samples

Published: Nov 29, 2017

Author(s): Maryam Vosough

Journal: Journal of Chemometrics

Abstract Coupling of multiway and multiset modeling methods with hyphenated chromatographic data for second‐order calibration purposes allows the quantification of multiple target analytes in highly complex samples, which otherwise would be impossible or at least a very hard task using univariate calibration scenario. In this regard, there are some chromatographic challenges that complicate attaining the best quantification...

Read More thumbnail image: Current challenges in secondorder calibration of hyphenated chromatographic data for analysis of highly complex samples

Combination of heuristic optimal partner bands for variable selection in near‐infrared spectral analysis

Published: Nov 29, 2017

Author(s): Jin Zhang, Xiaoyu Cui, Wensheng Cai, Xueguang Shao

Journal: Journal of Chemometrics

Abstract Variable selection plays a critical role in the analysis of near‐infrared (NIR) spectra. A method for variable selection based on the principle of the successive projection algorithm (SPA) and optimal partner wavelength combination (OPWC) was proposed for NIR spectral analysis. The method determines a number of knot variables with sufficient independence by SPA, and candidate variable bands with a definite width are...

Read More thumbnail image: Combination of heuristic optimal partner bands for variable selection in nearinfrared spectral analysis

In‐depth insight into the methods of plasma protein‐drug interaction studies: Comparison of capillary electrophoresis‐frontal analysis, isothermal titration calorimetry, circular dichroism and equilibrium dialysis

Published: Nov 29, 2017

Author(s): Hana Nevídalová, Lenka Michalcová, Zdeněk Glatz

Journal: ELECTROPHORESIS

Abstract Plasma protein‐drug binding assays are routinely performed during the early stages of drug discovery and development, which creates demand for an automated high‐throughput screening assay to increase laboratory efficiency. A comprehensive comparison of the four methods typically used for determining the binding parameters is presented in this study with respect to the above demand. Capillary electrophoresis‐frontal...

Read More thumbnail image: Indepth insight into the methods of plasma proteindrug interaction studies Comparison of capillary electrophoresisfrontal analysis isothermal titration calorimetry circular dichroism and equilibrium dialysis

SDS‐PAGE procedure: Application for characterization of new entirely uncharged nucleic acids analogs

Published: Nov 29, 2017

Author(s): Anna S. Pavlova, Evgeniya S. Dyudeeva, Maxim S. Kupryushkin, Nariman V. Amirkhanov, Dmitrii V. Pyshnyi, Inna A. Pyshnaya

Journal: ELECTROPHORESIS

Abstract SDS‐PAGE is considered to be a universal method for size‐based separation and analysis of proteins. In this study, we applied the principle of SDS‐PAGE to the analysis of new entirely uncharged nucleic acid (NA) analogues, – phosphoryl guanidine oligonucleotides (PGOs). The procedure was also shown to be suitable for morpholino oligonucleotides (PMOs) and peptide nucleic acids (PNAs). It was demonstrated that SDS can...

Read More thumbnail image: SDSPAGE procedure Application for characterization of new entirely uncharged nucleic acids analogs

Determination of tetracyclines in human urine samples by capillary electrophoresis in combination with field amplified sample injection

Published: Nov 29, 2017

Author(s): David Moreno‐González, Markéta Krulišová, Laura Gámiz‐Gracia, Ana M. García‐Campaña

Journal: ELECTROPHORESIS

Abstract A sensitive method using CZE‐UV detection has been developed for the determination of five tetracycline antibiotics in human urine samples. To improve the sensitivity of the method, an on‐line preconcentration strategy, named field‐amplified sample injection, has been developed, based on the electrokinetic injection of the sample, which requires only a 1:100 dilution with sample solvent before injection. Under optimum...

Read More thumbnail image: Determination of tetracyclines in human urine samples by capillary electrophoresis in combination with field amplified sample injection

Development and validation of a novel sensitive UV‐direct capillary electrophoresis method for quantification of alendronate in release studies from biomaterials

Published: Nov 29, 2017

Author(s): Juan Pablo Cattalini, Viviana Silvia Mouriño, Silvia Edith Lucangioli

Journal: ELECTROPHORESIS

Abstract A simple, highly sensitive, and robust CE method applied to the determination of alendronate (ALN) was developed from matrices for tissue engineering, characterized by being highly complex systems. The novel method was based on the ALN derivatization with o‐phthalaldehyde and 2‐mercaptoethanol for direct ultraviolet detection at 254 nm. The BGE consisted of 20 mM sodium borate buffer at pH 10, and the...

Read More thumbnail image: Development and validation of a novel sensitive UVdirect capillary electrophoresis method for quantification of alendronate in release studies from biomaterials

Flexible particle flow‐focusing in microchannel driven by droplet‐directed induced‐charge electroosmosis

Published: Nov 29, 2017

Author(s): Yukun Ren, Xianyu Liu, Weiyu Liu, Ye Tao, Yankai Jia, Likai Hou, Wenying Li, Hongyuan Jiang

Journal: ELECTROPHORESIS

Abstract We report herein a novel microfluidic particle concentrator that utilizes constriction microchannels to enhance the flow‐focusing performance of induced‐charge electroosmosis (ICEO), where viscous hemi‐spherical oil droplets are embedded within the mainchannel to form deformable converging‐diverging constriction structures. The constriction region between symmetric oil droplets partially coated on the electrode strips can...

Read More thumbnail image: Flexible particle flowfocusing in microchannel driven by dropletdirected inducedcharge electroosmosis
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