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Items from 1 to 20 out of 575 results

article

Sensitive and Selective Voltammetric Determination of Ciprofloxacin Using Screen‐printed Electrodes Modified with Carbon Black and Magnetic‐molecularly Imprinted Polymer

Ademar Wong, Anderson M. Santos, Tiago A. Silva, Fernando C. Moraes, more

This work reports the construction of screen‐printed electrode (SPE) modified with carbon black (CB) and magnetic Fe₃O₄ nanoparticles coated with molecularly imprinted polymer (mag@MIP) based on an alternative low‐cost approach. The proposed device was used for the sensitive and selective voltammetric determination of the antibiotic ciprofloxacin. The results obtained from cyclic voltammetry pointed...

article

First derivative synchronous spectrofluorimetric analysis of bisoprolol fumarate and ivabradine in pharmaceutical and biological matrices. Investigation of the method greenness

Shrouk M. Abo Elkheir, Abdallah M. Zeid, Jenny Jeehan M. Nasr, Mohamed I. Walash

Luminescence > 37 > 10 > 1657 - 1665

A novel, facile, rapid, and precise synchronous spectrofluorimetric method was evolved for the simultaneous estimation of bisoprolol fumarate and ivabradine in dosage forms and biological fluids. The estimation is based on measuring the first derivative of the synchronous fluorescence spectra of ivabradine and bisoprolol fumarate in ethanol at Δλ = 80 nm. The peak amplitudes are measured at 234.4 nm...

article

A novel determination method of quaternary ammonium oxime reactivators and their blood–brain barrier permeability evaluation by surface‐enhanced Raman spectrometry

Nannan Li, Sizhe Xie, Jianfeng Wu, Jun Yang, more

Journal of Raman Spectroscopy > 53 > 9 > 1522 - 1532

The quaternary ammonium oxime reactivators are a class of important reactivators for nerve agents poisoning, and their sensitive and specific analysis in biomedical samples meets many challenges due to their highly polar properties. In present paper, a novel determination method based on surface‐enhanced Raman spectrometry (SERS) was developed for series of quaternary ammonium oxime reactivators....

article

Recent advances in the chromatographic determination of the most commonly used anti‐hepatitis C drug sofosbuvir and its co‐administered drugs in human plasma

Muhammed Abdel‐Hamied Abdel‐Tawab, Muhammad G. Abd El‐Moghny, Rasha Mohamed El Nashar

Biomedical Chromatography > 36 > 1 > n/a - n/a

Sofosbuvir is a direct‐acting antiviral drug that inhibits hepatitis C virus (HCV) NS5B polymerase, which in turn affects the virus replication inside biological systems. The clinical importance of sofosbuvir is based not only on its effect on HCV but also on other lethal viruses such as Zika and severe acute respiratory syndrome coronavirus disease 2019 (SARS‐COVID‐19). Accordingly, there is a continuous...

article

Preparative continuous flow electrophoretic instrumentation for purification of biological samples

Miroslava Stastna, Karel Slais

ELECTROPHORESIS > 42 > 20 > 2103 - 2111

We constructed a preparative instrumentation and developed the methods that are based on separation of the samples by bidirectional isotachophoresis/moving boundary electrophoresis in continuous divergent flow. The described instrumentation can be used for a variety of the samples, however, it can be easily optimized and tailored for the specific sample. The trapezoid separation bed from nonwoven...

article

Recent applications of microextraction sample preparation techniques in biological samples analysis

Seyed Mosayeb Daryanavard, Hesane Zolfaghari, Abbi Abdel‐Rehim, Mohamed Abdel‐Rehim

Biomedical Chromatography > 35 > 7 > n/a - n/a

Analysis of biological samples is affected by interfering substances with chemical properties similar to those of the target analytes, such as drugs. Biological samples such as whole blood, plasma, serum, urine and saliva must be properly processed for separation, purification, enrichment and chemical modification to meet the requirements of the analytical instruments. This causes the sample preparation...

article

A proof‐of‐concept of parallel single‐drop microextraction for the rapid and sensitive biomonitoring of pesticides in urine

Gabriela Mafra, Camila Will, Ricardo Huelsmann, Josias Merib, more

Journal of Separation Science > 44 > 9 > 1961 - 1968

In this study, a lab‐made parallel single‐drop microextraction methodology using the magnetic ionic liquid trihexyltetradecylphosphonium tetrachloromanganate (II) as extraction solvent was developed to determine the pesticides tebuconazole, pendimethalin, dichlorodiphenyltrichloroethane, and dichlorodiphenyldichloroethylene in human urine samples. The experimental setup consisted of a 96‐well plate...

article

Extraction of naturally occurring cannabinoids: an update

Lutfun Nahar, Shaikh Jamal Uddin, Md. Ashraful Alam, Satyajit D. Sarker

Phytochemical Analysis > 32 > 3 > 228 - 241

Introduction Organic molecules that interact with the cannabinoid receptors are called cannabinoids, which can be endogenous, natural or synthetic compounds. They possess similar pharmacological properties as produced by the plant, Cannabis sativa L. Before cannabinoids can be analysed, they need to be extracted from the matrices. Objective To review literature on the methods and protocols for...

article

Ti (IV) modified vinyl phosphate magnetic nanoparticles for simultaneous preconcentration of multiple arsenic species from chicken samples followed by HPLC‐ICP‐MS analysis

Qiuyue Xu, Beibei Chen, Man He, Bin Hu

ELECTROPHORESIS > 42 > 4 > 465 - 472

Ti (IV)‐modified vinyl phosphate magnetic nanoparticles (Fe₃O₄@SiO₂@KH570‐PO₄‐Ti (IV)) was prepared for simultaneous extraction of multiple arsenic species, followed by high performance liquid chromatography (HPLC)– inductively coupled plasma mass spectrometry (ICP‐MS) analysis. Inorganic arsenic (iAs), dimethyl arsenic acid (DMA), monomethyl arsenic acid (MMA), p‐amino phenyl arsenic acid (p‐ASA),...

article

Feasibility of microwave‐induced combustion combined with inductively coupled plasma mass spectrometry for bromine and iodine determination in human nail

Diogo La Rosa Novo, Alessandra Schneider Henn, Erico Marlon Moraes Flores, Marcia Foster Mesko

Rapid Communications in Mass Spectrometry > 34 > S3 > n/a - n/a

Rationale Bromine and iodine have important physiological functions; however, in inadequate concentration, they can also cause several physiological problems. Their mobility assessment in human organisms through biological sampling may help clarify some doubts related to metabolic routes, which are still not well elucidated. In this context, a suitable analytical method for this purpose should be...

article

Dimethyldioctadecylanimonium bentonite immobilized magnetic chitosan nanoparticles as an efficient adsorbent for vortex‐assisted magnetic dispersive micro‐solid‐phase extraction of celecoxib from human breast milk, plasma and urine samples

Seyedeh Maedeh Majidi, Mohammad Reza Hadjmohammadi

Biomedical Chromatography > 34 > 9 > n/a - n/a

A polymer/layered silicate composite based on dimethyldioctadecylanimonium bentonite/chitosan magnetic nanoparticles was synthesized and characterized by field emission transmission electron microscopy, X‐ray diffraction and Fourier transform infrared spectrometry. The prepared nanocomposite was used to isolate and preconcentrate celecoxib from human breast milk, urine and plasma samples. In this...

article

Continuous flow electrophoretic separation — Recent developments and applications to biological sample analysis

Miroslava Stastna

ELECTROPHORESIS > 41 > 1-2 > 36 - 55

Continuous flow electrophoretic separation with continuous sample loading provides the advantage of processing volumes of any sizes, as well as the benefit of a real‐time monitoring and optimization of the separation process. In addition, the spatial separation of the sample enables collecting multiple separated components simultaneously and in a continuous manner. The separation is usually performed...

article

Sposoby odbiałczania płynnych próbek biologicznych

Justyna Piechocka, Daria Pietrzyk, Rafał Głowacki

Analityka : nauka i praktyka > 2020 > nr 1 > 38--42

Pomimo istnienia dużej różnorodności sposobów odbiałczania próbek biologicznych nie opracowano dotychczas jednej uniwersalnej techniki pozbawionej ograniczeń.

article

CE‐MS with electrokinetic supercharging and application to determination of neurotransmitters

Shane S. Wells, Mohamed Dawod, Robert T. Kennedy

ELECTROPHORESIS > 40 > 22 > 2946 - 2953

Electrokinetic supercharging (EKS) is known as one of the most effective online electrophoretic preconcentration techniques, though pairing with it with mass spectrometry has presented challenges. Here, EKS is successfully paired with ESI‐MS/MS to provide a sensitive and robust method for analysis of biogenic amines in biological samples. Injection parameters including electric field strength and...

article

Semi‐automatic combustion of environmental and biological samples on Oxidizer M307 and equivalents: New solutions for background reduction

Corina A. Simion, Nicolae Mocanu, Oana Gaza, Iuliana M. Stanciu, more

Journal of Labelled Compounds and Radiopharmaceuticals > 62 > 11 > 758 - 767

The aim is to introduce and characterize a new experimental demonstrative model contributing to the increase of measurement accuracy, in terms of minimum detectable activity (MDA) and background reduction, for the analysis of samples having low concentrations in tritium and radiocarbon on Quantulus 1220. The clue is related to the qualitative and quantitative differences between tritium and carbon‐14...

article

Identification of the major metabolites of (R)‐salbutamol in human urine, plasma and feces using ultra high performance liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry

Fengying Ye, Shan Liu, Yang Yang, Ting Zhao, more

Journal of Separation Science > 42 > 20 > 3200 - 3208

(R)‐Salbutamol is a selective β2‐adrenoreceptor agonist, which produces a short‐acting bronchodilator effect and is widely used for the treatment of respiratory diseases in humans. Drug metabolism and identification of the metabolites play an essential role in the evaluation of the overall efficacy and safety of the drugs in clinical practices. There are few reports on the identification of major...

article

Development of air‐assisted dispersive micro‐solid‐phase extraction‐based supramolecular solvent‐mediated Fe₃O₄@Cu–Fe–LDH for the determination of tramadol in biological samples

Maryam Ezoddin, Laleh Adlnasab, Akram Afshari Kaveh, Mohammad Ali Karimi, more

Biomedical Chromatography > 33 > 9 > n/a - n/a

A simple method, air‐assisted dispersive micro‐solid‐phase extraction‐based supramolecular solvent was developed for the preconcentration of tramadol in biological samples prior to gas chromatography–flame ionization detection. A new type of carrier liquid, supramolecular solvent based on a mixture of 1‐dodecanol and tetrahydrofuran was combined with layered double hydroxide coated on a magnetic nanoparticle...

article

A New Method for Purifying Fat-Containing Extracts in the Determination of Polybrominated Diphenyl Ethers

A. A. Shelepchikov, V. V. Ovcharenko, A. I. Kozhushkevich, E. S. Brodskii, more

Journal of Analytical Chemistry > 2019 > 74 > 6 > 574-583

We developed a sample preparation method for the determination of polybrominated diphenyl ethers (PBDEs) with from one to ten bromine atoms in samples of feed and food products containing approximately 0.5 g of animal fat or vegetable oil. The method involves gas chromatography with high-resolution mass spectrometry or tandem mass spectrometry. A possibility of using various reagents for the purification...

article

Selective and sensitive determination of Cd(II) ions in various samples using a novel modified carbon paste electrode

Refaat F. Aglan, Mostafa M. Hamed, Hosam M. Saleh

Journal of Analytical Science and Technology > 2019 > 10 > 1 > 1-11

Based on the highly toxic effects of Cd(II) on the aquatic environment and the human health, identification and evaluation of such pollutants is required. Efficient and economic electrodes for sensitive and selective detection of this element are very important. In this study, carbon paste electrode (CPE) modified with lanthanum tungstate ion exchanger was assembled for potentiometric assay of Cd(II)...

article

Comparison and validation of methods for the determination of ⁹⁰Sr by Cerenkov counting in biological and sediment samples, including green chemistry metrics

J. Rivera-Silva, S. Hurtado-Bermúdez, M. Villa-Alfageme, G. Manjón

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 320 > 1 > 109-122

In this work, a comparative study of two popular radiochemical procedures for ⁹⁰Sr determination in biological and sediment samples via Cerenkov counting was performed. Comparative tests were carried out with a Liquid Scintillation Counter (LSC) and several key factors related to green analytical chemistry were considered. Chemical yields, time of analysis, cost per sample, hazardous reagents used...

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Sensitive and Selective Voltammetric Determination of Ciprofloxacin Using Screen‐printed Electrodes Modified with Carbon Black and Magnetic‐molecularly Imprinted Polymer

First derivative synchronous spectrofluorimetric analysis of bisoprolol fumarate and ivabradine in pharmaceutical and biological matrices. Investigation of the method greenness

A novel determination method of quaternary ammonium oxime reactivators and their blood–brain barrier permeability evaluation by surface‐enhanced Raman spectrometry

Recent advances in the chromatographic determination of the most commonly used anti‐hepatitis C drug sofosbuvir and its co‐administered drugs in human plasma

Preparative continuous flow electrophoretic instrumentation for purification of biological samples

Recent applications of microextraction sample preparation techniques in biological samples analysis

A proof‐of‐concept of parallel single‐drop microextraction for the rapid and sensitive biomonitoring of pesticides in urine

Extraction of naturally occurring cannabinoids: an update

Ti (IV) modified vinyl phosphate magnetic nanoparticles for simultaneous preconcentration of multiple arsenic species from chicken samples followed by HPLC‐ICP‐MS analysis

Feasibility of microwave‐induced combustion combined with inductively coupled plasma mass spectrometry for bromine and iodine determination in human nail

Dimethyldioctadecylanimonium bentonite immobilized magnetic chitosan nanoparticles as an efficient adsorbent for vortex‐assisted magnetic dispersive micro‐solid‐phase extraction of celecoxib from human breast milk, plasma and urine samples

Continuous flow electrophoretic separation — Recent developments and applications to biological sample analysis

Sposoby odbiałczania płynnych próbek biologicznych

CE‐MS with electrokinetic supercharging and application to determination of neurotransmitters

Semi‐automatic combustion of environmental and biological samples on Oxidizer M307 and equivalents: New solutions for background reduction

Identification of the major metabolites of (R)‐salbutamol in human urine, plasma and feces using ultra high performance liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry

Development of air‐assisted dispersive micro‐solid‐phase extraction‐based supramolecular solvent‐mediated Fe₃O₄@Cu–Fe–LDH for the determination of tramadol in biological samples

A New Method for Purifying Fat-Containing Extracts in the Determination of Polybrominated Diphenyl Ethers

Selective and sensitive determination of Cd(II) ions in various samples using a novel modified carbon paste electrode

Comparison and validation of methods for the determination of ⁹⁰Sr by Cerenkov counting in biological and sediment samples, including green chemistry metrics

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