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Rapid automatic creation of monodisperse emulsion droplets by microfluidic device with degassed PDMS slab as a detachable suction actuator

Published: Sep 1, 2017

Author(s): Yuki Murata, Yuta Nakashoji, Masaki Kondo, Yugo Tanaka, Masahiko Hashimoto

Journal: ELECTROPHORESIS

We previously developed a technique that enabled automatic creation of monodisperse water‐in‐oil droplets with the use of an air‐evacuated PDMS microfluidic device. Although the device generated droplets over a long‐time period, the production rate was slow (∼10 droplets per second). In the current study, we aimed to improve this rate, using the same fluid pumping principle described in our previous work, by remodeling our device...

Read More thumbnail image: Rapid automatic creation of monodisperse emulsion droplets by microfluidic device with degassed PDMS slab as a detachable suction actuator

Synthesis of supermacroporous cryogel for bioreactors continuous starch hydrolysis

Published: Sep 1, 2017

Author(s): Ederson Paulo Xavier Guilherme, Jocilane Pereira Oliveira, Lorendane Millena Carvalho, Igor Viana Brandi, Sérgio Henrique Sousa Santos, Gleidson Giordano Pinto Carvalho, Junio Cota, Bruna Mara Aparecida de Carvalho

Journal: ELECTROPHORESIS

A bioreactor was built by means of immobilizing alpha‐amylase from Aspergillus oryzae by encapsulation, through cryopolymerization of acrylamide monomers for the continuous starch hydrolysis. The starch hydrolysis was evaluated regarding pH, the concentration of immobilized amylase on cryogel, the concentration of starch solution and temperature. The maximum value for starch hydrolysis was achieved at pH 5.0, concentration of immobilized enzyme...

Read More thumbnail image: Synthesis of supermacroporous cryogel for bioreactors continuous starch hydrolysis

Advances in the analysis of “less‐conventional” human body fluids: An overview of the CE‐ and HPLC‐MS applications in the years 2015–2017

Published: Sep 1, 2017

Author(s): Monica Di Venere, Simona Viglio, Maddalena Cagnone, Anna Bardoni, Roberta Salvini, Paolo Iadarola

Journal: ELECTROPHORESIS

Aim of this article is to focus the attention of the reader on the application of CE/MS and LC/MS to the analysis of human body fluids not currently used for the diagnosis of disorders and, for this reason, catalogued as “less/nonconventional” fluids, that is, tears, nasal secretions, cerumen, bronchoalveolar lavage fluid, sputum, exhaled breath condensate, nipple aspirate, breast milk, amniotic fluid, bile, seminal plasma, liposuction...

Read More thumbnail image: Advances in the analysis of lessconventional human body fluids An overview of the CE and HPLCMS applications in the years 20152017

Mutation rates in 21 autosomal short tandem repeat loci in a population from Goiás, Brazil

Published: Sep 1, 2017

Author(s): Thaís Cidália Vieira, Marc Alexandre Duarte Gigonzac, Ricardo Goulart Rodovalho, Luana Morais Cavalcanti, Lysa Bernardes Minasi, Flávia Melo Rodrigues, Aparecido Divino da Cruz

Journal: ELECTROPHORESIS

The appearance of new mutations in polymorphic markers plays a central role in a range of genetic applications, including dating phylogenetic events, informing disease studies, and evaluating forensic evidence. The present study estimated the mutation rates of 21 autosomal STR loci in a population from Central Brazil. We studied 15 046 paternity cases from Goiás, Brazil from August 2012 to February 2015. We identified 262 mutations...

Read More thumbnail image: Mutation rates in 21 autosomal short tandem repeat loci in a population from Goias Brazil

Extraction of ochratoxin A in red wine with dopamine‐coated magnetic multi‐walled carbon nanotubes

Published: Aug 31, 2017

Author(s): Hong Wan, Bo Zhang, Xiao‐Lin Bai, Yan Zhao, Meng‐Wei Xiao, Xun Liao

Journal: Journal of Separation Science

A new, rapid, green, and cost‐effective magnetic solid‐phase extraction of ochratoxin A from red wine samples was developed using polydopamine‐coated magnetic multi‐walled carbon nanotubes as the absorbent. The polydopamine‐coated magnetic multi‐walled carbon nanotubes were fabricated with magnetic multi‐walled carbon nanotubes and dopamine by an in situ oxidative self‐polymerization approach. Transmission electron microscopy, dynamic...

Read More thumbnail image: Extraction of ochratoxin A in red wine with dopaminecoated magnetic multiwalled carbon nanotubes

Magnetic porous carbon derived from Co‐doped metal–organic frameworks for the magnetic solid‐phase extraction of endocrine disrupting chemicals

Published: Aug 31, 2017

Author(s): Lin Hao, Jiayi Wei, Ruixue Zheng, Chun Wang, Qiuhua Wu, Zhi Wang

Journal: Journal of Separation Science

Metal–organic frameworks‐5 (MOF‐5) was explored as a template to prepare porous carbon due to its high surface area, large pore volume, and permanent nanoscale porosity. Magnetic porous carbon, Co@MOF‐5‐C, was fabricated by the one‐step direct carbonization of Co‐doped MOF‐5. After carbonization, the magnetic cobalt nanoparticles are well dispersed in the porous carbon matrix, and Co@MOF‐5‐C displays strong magnetism (with the saturation...

Read More thumbnail image: Magnetic porous carbon derived from Codoped metalorganic frameworks for the magnetic solidphase extraction of endocrine disrupting chemicals

Ultra high performance liquid chromatography coupled with electrospray ionization/quadrupole time‐of‐flight mass spectrometry for the rapid analysis of constituents in the traditional Chinese medicine formula Wu Ji Bai Feng Pill

Published: Aug 31, 2017

Author(s): Shengnan Duan, Wen Qi, Siwen Zhang, Kunkun Huang, Dan Yuan

Journal: Journal of Separation Science

An ultra high performance liquid chromatography coupled with electrospray ionization quadrupole time‐of‐flight mass spectrometry method in both positive and negative ion modes was established in order to comprehensively investigate the major constituents in Wu Ji Bai Feng Pill. Briefly, a Waters ACQUITY UPLC HSS C18 column was used to separate the aqueous extract of Wu Ji Bai Feng Pill. A total of 0.1% formic acid in acetonitrile and 0.1% ...

Read More thumbnail image: Ultra high performance liquid chromatography coupled with electrospray ionizationquadrupole timeofflight mass spectrometry for the rapid analysis of constituents in the traditional Chinese medicine formula Wu Ji Bai Feng Pill

Sensitive determination of typical phenols in environmental water samples by magnetic solid‐phase extraction with polyaniline@SiO 2 @Fe as the adsorbents before HPLC

Published: Aug 31, 2017

Author(s): Qingxiang Zhou, Yongyong Yuan, Yalin Wu, Yongli Liu

Journal: Journal of Separation Science

A novel magnetic core–shell material polyaniline@SiO2@Fe (PANI@SiO2@Fe) has been successfully synthesized and investigated as an effective adsorbent for the magnetic solid‐phase extraction of typical endocrine disrupting compounds such as bisphenol A, tetrabromobisphenol A, and 4‐nonylphenol from water samples. The morphology of the as‐prepared PANI@SiO2@Fe was characterized by transmission electron microscopy and X‐ray diffraction. The main...

Read More thumbnail image: Sensitive determination of typical phenols in environmental water samples by magnetic solidphase extraction with polyanilineSiO 2 Fe as the adsorbents before HPLC

Single standard substance for the determination of nine volatile components in the distillate of Fructus Gardeniae and Radix Curcumae (an intermediate of Xingnaojing Injection)

Published: Aug 31, 2017

Author(s): Jinyang Fang, Bo Yang, Zhiwei Ge, Xue Bai, Binjun Yan

Journal: Journal of Separation Science

Xingnaojing Injection is a traditional Chinese medicine extensively used for stroke and cerebral ischemia. For better in‐process quality control of Xingnaojing Injection, a method for the analysis of its intermediate (i.e., the distillate of Fructus Gardeniae and Radix Curcumae) is needed to monitor and optimize the hydrodistillation extraction process. In this work, nine major volatile components in the intermediate were identified: isophorone,...

Read More thumbnail image: Single standard substance for the determination of nine volatile components in the distillate of Fructus Gardeniae and Radix Curcumae an intermediate of Xingnaojing Injection

Comprehensive headspace gas chromatographic analysis of denaturants in denatured ethanol

Published: Aug 31, 2017

Author(s): Niels Boxtel, Kris Wolfs, Marta Guillén Palacín, Ann Schepdael, Erwin Adams

Journal: Journal of Separation Science

To discourage consumption, ethanol is often denatured using both volatile (e.g., methyl ethyl ketone and isopropanol) and nonvolatile (e.g., denatonium benzoate) chemical substances. As a result, the analysis of denatured ethanol samples is usually performed by multiple techniques such as gas chromatography for the volatile denaturants and liquid chromatography for the nonvolatile ones. However, the need for multiple techniques increases...

Read More thumbnail image: Comprehensive headspace gas chromatographic analysis of denaturants in denatured ethanol

Decoding the microstructural correlate of diffusion MRI

Published: Aug 31, 2017

Author(s): Svenja Caspers, Markus Axer

Journal: NMR in Biomedicine

Diffusion imaging has evolved considerably over the past decade. While it provides valuable information about the structural connectivity at the macro‐ and mesoscopic scale, bridging the gap to the microstructure at the level of single nerve fibers poses an enormous challenge. This is particularly true for the human brain with its large size, its large white‐matter volume and availability of histological techniques for studying human...

Read More thumbnail image: Decoding the microstructural correlate of diffusion MRI

Post‐modified non‐negative matrix factorization for deconvoluting the gene expression profiles of specific cell types from heterogeneous clinical samples based on RNA‐sequencing data

Published: Aug 31, 2017

Author(s): Yuan Liu, Yu Liang, Qifan Kuang, Fanfan Xie, Yingyi Hao, Zhining Wen, Menglong Li

Journal: Journal of Chemometrics

Abstract The application of supervised algorithms in clinical practice has been limited by the lack of information on pure cell types. Several supervised algorithms have been proposed to estimate the gene expression patterns of specific cell types from heterogeneous samples. Post‐modified non‐negative matrix factorization (NMF), the unsupervised algorithm we proposed here, is capable of estimating the gene expression profiles and...

Read More thumbnail image: Postmodified nonnegative matrix factorization for deconvoluting the gene expression profiles of specific cell types from heterogeneous clinical samples based on RNAsequencing data

Raman spectroscopic determination of Sr/Ca ratios of calcite samples

Published: Aug 31, 2017

Author(s): Yusuke Shibano, Kohei Takahata, Jun Kawano, Tsuyoshi Watanabe, Daisuke Enomoto, Hiroyuki Kagi, Natsumi Kamiya, Junji Yamamoto

Journal: Journal of Raman Spectroscopy

Abstract We investigated the relation between Sr# [= 100 Sr/(Sr + Ca) in mol] of calcites and their Raman spectra for Sr‐doped calcite samples with Sr# of 0–13.2. We selected 3 major Raman peaks observed at 150–155 cm−1 (peak A), 274–282 cm−1 (peak B), and 710–712.5 cm−1 (peak C). With increasing Sr#, the peaks shifted monotonously to lower wavenumbers. We obtained a linear expression for peak B as...

Read More thumbnail image: Raman spectroscopic determination of SrCa ratios of calcite samples

FTIR‐ATR adulteration study of hempseed oil of different geographic origins

Published: Aug 31, 2017

Author(s): Ozren Jović, Alan Jović

Journal: Journal of Chemometrics

Abstract Adulteration of hempseed (H) oil, a well‐known health beneficial nutrient, is studied in this work by mixing it with cheap and widely used oils such as rapeseed (R) oil and sesame (Se) and sunflower (Su) oil. Many samples of different geographic origins were taken into account. Binary mixture sets of hempseed oil with these 3 oils (HR, HSe, and HSu) were considered. FTIR spectra of pure oils and their mixtures were...

Read More thumbnail image: FTIRATR adulteration study of hempseed oil of different geographic origins

Quantitative surface‐enhanced resonance Raman scattering analysis of methylene blue using silver colloid

Published: Aug 31, 2017

Author(s): J.A. Anastasopoulos, A. Soto Beobide, A.C. Manikas, G.A. Voyiatzis

Journal: Journal of Raman Spectroscopy

Abstract Quantitative analysis of methylene blue (MB) has been performed with Surface Enhanced Raman Scattering, SERS, using citrate reduced silver colloid activated with NaCl. In this study, the combination of SERS occurring at the proximity of the plasmon surface and of resonance Raman with excitation wavelength matched to the maximum absorbance of the molecule being analyzed, was successfully applied to maximize the Raman...

Read More thumbnail image: Quantitative surfaceenhanced resonance Raman scattering analysis of methylene blue using silver colloid

Quantification of cocaine in ternary mixtures using partial least squares regression applied to Raman and Fourier transform infrared spectroscopy

Published: Aug 31, 2017

Author(s): Ciro Augusto Fernandes Oliveira Penido, Marcos Tadeu Tavares Pacheco, Etelvino Henrique Novotny, Igor K. Lednev, Landulfo Silveira

Journal: Journal of Raman Spectroscopy

Abstract The use of chemicals is often related to suicide attempts and acute poisoning, which account for a significant number of hospital admissions. The differential diagnosis of patients exposed to poisoning is intricate and varies according to the substance used. The identification of drugs and drug abuse in cases of poisoning often requires time‐consuming and complex techniques, such as chromatography. The use of vibrational...

Read More thumbnail image: Quantification of cocaine in ternary mixtures using partial least squares regression applied to Raman and Fourier transform infrared spectroscopy

Identifying the stacking order of multilayer graphene grown by chemical vapor deposition via Raman spectroscopy

Published: Aug 31, 2017

Author(s): Miao‐Ling Lin, Tao Chen, Wei Lu, Qing‐Hai Tan, Pei Zhao, Hong‐Tao Wang, Yang Xu, Ping‐Heng Tan

Journal: Journal of Raman Spectroscopy

Large‐area monolayer (1LG) and multilayer graphene (MLG) grown by chemical vapor deposition (CVD) have been of great technological importance for the graphene electronics and photonics. Such CVD‐grown MLG (CVD‐MLG) flakes consist of multiple single crystal domains, whose stacking orders can be diverse due to the various choices of layer number, stacking sequence, and twist angle. Here, we demonstrated a way to identify the stacking order...

Read More thumbnail image: Identifying the stacking order of multilayer graphene grown by chemical vapor deposition via Raman spectroscopy

Alkaloid profiling of herbal drugs using high resolution mass spectrometry

Published: Aug 31, 2017

Author(s): Tiziana Nardin, Edi Piasentier, Chiara Barnaba, Roberto Larcher

Journal: Drug Testing and Analysis

Abstract Herbal infusions are consumed worldwide thanks to their “natural” beneficial effects, also due to the presence of alkaloids, although these compounds can have poisonous effects. A method combining online solid‐phase purification with high resolution mass spectrometry was used to define the alkaloid profiles of 117 herbs and 7 commercial blends. Forty‐one alkaloids were quantified in reference to analytical standards, while...

Read More thumbnail image: Alkaloid profiling of herbal drugs using high resolution mass spectrometry

Power of Orbitrap‐based LC‐high resolution‐MS/MS for comprehensive drug testing in urine with or without conjugate cleavage or using dried urine spots after on‐spot cleavage in comparison to established LC–MS n or GC–MS procedures

Published: Aug 31, 2017

Author(s): Julian A. Michely, Markus R. Meyer, Hans H. Maurer

Journal: Drug Testing and Analysis

Abstract Reliable, sensitive, and comprehensive urine screening procedures by gas chromatography–mass spectrometry (GC–MS) or liquid chromatography–mass spectrometry (LC–MS) with low or high resolution (HR) are of high importance for drug testing, adherence monitoring, or detection of toxic compounds. Besides conventional urine sampling, dried urine spots are of increasing interest. In the present study, the power of LC–HR–MS/MS was...

Read More thumbnail image: Power of Orbitrapbased LChigh resolutionMSMS for comprehensive drug testing in urine with or without conjugate cleavage or using dried urine spots after onspot cleavage in comparison to established LCMS n or GCMS procedures

Study of the in vitro and in vivo metabolism of the tryptamine 5‐MeO‐MiPT using human liver microsomes and real case samples

Published: Aug 31, 2017

Author(s): Katharina Elisabeth Grafinger, Marianne Hädener, Stefan König, Wolfgang Weinmann

Journal: Drug Testing and Analysis

Abstract The synthetic tryptamine 5‐methoxy‐N‐methyl‐N‐isopropyltryptamine (5‐MeO‐MiPT) has recently been abused as a hallucinogenic drug in Germany and Switzerland. This study presents a case of 5‐MeO‐MiPT intoxication and the structural elucidation of metabolites in pooled human liver microsomes (pHLM), blood, and urine. Microsomal incubation experiments were performed using pHLM to detect and identify in vitro metabolites. In August 2016,...

Read More thumbnail image: Study of the in vitro and in vivo metabolism of the tryptamine 5MeOMiPT using human liver microsomes and real case samples
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