Highly sensitive detection of melamine in milk samples based on N-methylmesoporphyrin IX/G-quadruplex structure
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Jiujun Wang, Ya Wu, Qinghua Wu, Li Li, Yun Wang, Hualin YangAbstractMelamine has a high nitrogen content thus is often illegally added to milk powder to phonily boost the protein percentage composition. Milk products containing melamine are harmful to babies and children. In the present work, a simple, label-free and turn-on fluorescence method to detect melamine with a high sensitivity and selectivity has been developed. The N-methylmesoporphyrin IX (NMM)/G-quadruplex structure is used as a signal reporter in this method to realize label-free d...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Metabolomics driven analysis of obesity-linked colorectal cancer patients via GC-MS and chemometrics: A pilot study
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Heba A. Hassan, Naglaa M. Ammar, Ahmed Serag, Olfat G. Shaker, Abdel Nasser El Gendy, Abdel-Hamid Z. Abdel-HamidAbstractColorectal cancer (CRC) is a major public health concern and one of the main causes of cancer-related deaths worldwide. Of different risk factors for developing CRC, obesity plays a vital key role in colorectal carcinogenesis due to the perturbation in the metabolic and lipid profiles of obese candidates. The aim of this study is to decipher the disturbed metabolites associated with CRC susceptibility in at-risk obese populatio...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Single step preparation of platinum nanoflowers/reduced graphene oxide electrode as a novel platform for diclofenac sensor
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Kritthana Kimuam, Nadnudda Rodthongkum, Nattaya Ngamrojanavanich, Orawon Chailapakul, Nipapan RuechaAbstractA single step preparation of platinum nanoflowers and reduced graphene oxide nanocomposite (PtNFs/rGO) modified electrode was accomplished using cyclic voltammetry (CV). A flower-like platinum structure with the homogeneous distribution of PtNFs/rGO on the screen-printed carbon electrode surface was clearly observed by scanning electron microscopy (SEM). The electrochemical behaviors of PtNFs/rGO electrode were systematically investigated ...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Carbon thick sheet potentiometric sensor for selective determination of silver ions in X-ray photographic film
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Eman Yossri Frag, Nahed A. El-Zaher, Sally E.A. ElasheryAbstractInnovative screen-printed electrode (SPE) based on Alizarin Red S (ARS) for Ag (I) ion determination was developed. The ionophore content was varied and optimized which indicated that the ink incorporating 30 mg of Alizarin Red S reflects the best experimental performance exhibiting monovalent Nernstian slope value of 59.95 mV decade−1 over a considerable spacious concentration range from 5.0 × 10−7 to 1.0 × 10−2 mol L...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Deep inside the color: How optical microscopy contributes to the elemental characterization of a painting
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Anna Galli, Michele Caccia, Letizia Bonizzoni, Marco Gargano, Nicola Ludwig, Gianluca Poldi, Marco MartiniAbstractIn the context of paintings characterization, X-Ray Fluorescence (XRF) combined with Fibre Optics Reflectance Spectroscopy (FORS) is a well-known methodology. The latter allows to classify the pigments constituting the external layers (few microns) of the painting while the former provides the fingerprint of the main chemical elements present in almost all layers (tens of microns) of the sample. The synergetic application of XRF and ...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

A label-free and sensitive electrochemiluminescence sensor based on a simple one-step electrodeposition of Go/ZnS modified electrode for trace copper ions detection
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Yousheng Ye, Lingyi Wang, Kunming Liu, Jianguo LiAbstractHerein, we described an electrochemiluminescence (ECL) strategy for trace amounts of Cu2+ determination based on a simple one-step electrodeposition of graphene oxide supported ZnS nanocrystals modified electrode (GO/ZnS/GC). The quantitatively detection of Cu2+ in the samples is developed on the quenching effect of Cu2+ on GO/ZnS. Moreover, the deposited GO/ZnS is an environmental friendly material with excellent ECL performance. The morphologies and chemical compositions of GO/ZnS/GC hav...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Polyaniline stabilized Silver (I) Oxide nanocubes for sensitive and selective detection of hemoglobin in urine for hematuria evaluation
In this report, the Ag2O nanocubes were synthesized by the co-precipitation method and further stabilized with polyaniline (PANI). The bio-complex formed between PANI stabilized Ag2O nanocubes, and heme group of Hemoglobin (Hb) resulted in an increase of absorption intensity of Ag2O nanocubes at 420 nm. This is due to the electronic transition from Heme to Ag+. This also leads to conformational changes in Hb. Ag2O-PANI interactions and stability studies were confirmed by Ultraviolet-Visible spectroscopy (UV–Vis), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy. The ...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Optimal film thickness of rGO/MoS2 @ polyaniline nanosheets of 3D arrays for carcinoembryonic antigen high sensitivity detection
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Yiju Song, Kaihang Cao, Wenjun Li, Chaoyun Ma, Xiuwen Qiao, Hongling Li, Chenglin HongAbstractA three-dimensional array of reduced graphene oxide/MoS2 @ polyaniline-layered nanosheets (denoted as rGO/MoS2 @ PANI) has a novel structure of intercalated MoS2/PANI nanosheets arrays arranged on rGO that can be used as carcinoembryonic antigen (CEA) electrochemical immunosensors (detectors). In this graded nanosheet, the PANI was embedded in the MoS2 interlayer. The MoS2/PANI nanosheets themselves limit volumetric changes when arranged as MoS2/PANI na...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Investigation of the unique solutions in bilinear decomposition of multiset chemical data
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Masoumeh Alinaghi, Hamid AbdollahiAbstractMultiset data analysis can be a proper way to increase the accuracy of multivariate curve resolution (MCR) results, which is dropped due to rotational ambiguity. Resolution theorems and databased-uniqueness introduce the conditions for obtaining the unique solutions. However, the conditions for resolution theorems are dependent on the estimation of local rank information. With multiset analysis, there is a possibility to design the calibration data sets that provide conditions for resolution theorems. Th...
Source: Microchemical Journal - February 23, 2020 Category: Chemistry Source Type: research

Automation of continuous flow analysis systems – a review
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Marcos Almeida Bezerra, Valfredo Azevedo Lemos, Djalma Menezes de Oliveira, Cleber Galvão Novaes, Jeferson Alves Barreto, Juscelia Pereira Santos Alves, Uillian Mozart Ferreira da Mata Cerqueira, Queila Oliveira dos Santos, Sulene Alves AraújoAbstractThis review approaches the automation of continuous flow analysis systems. The characteristics and working principles of the devices necessary for automation of the steps of the system are presented and discussed. Automation can be performed by a simple automatic sampler, by the contro...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Derivative spectrophotometry and multivariate optimization for simultaneous removal of Titan yellow and Bromophenol blue dyes using polyaniline@SiO2 nanocomposite
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Mahdieh Rastgordani, Javad Zolgharnein, Vahid MahdaviAbstractIn the present study, the performance of PAN@SiO2 nanocomposites as an adsorbent to remove Bromophenol blue (BPB) and Titan yellow (TY), was considered in single- and binary-component solutions. PAN@SiO2 nanocomposites were characterized through diverse techniques such as FE-SEN, XRD, FTIR, and EDX. Derivative spectrophotometry (DS) was developed to determine TY and BPB in two-compound mixtures employing ‘zero-crossing’ technique. In fact, useful parameters such as the amou...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

An automatic hyperspectral scanning system for the technical investigations of Chinese scroll paintings
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): G.H. Li, Y. Chen, X.J. Sun, P.Q. Duan, Y. Lei, L.F. ZhangAbstractChinese scroll painting is one of the oldest continuous artistic traditions in the world. These paintings are characterized by brushwork, pigment category and painting style. In order to nondestructively investigate the techniques of large-scale Chinese scroll paintings, an automatic hyperspectral scanning system, composed of a hyperspectral camera, a halogen light source, an automatic scanning platform, data processing software and a reference spectral library, was set up. This sy...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

3D nitrogen-doped porous graphene aerogel as high-performance electrocatalyst for determination of gallic acid
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Nabilah Al-Ansi, Abdulwahab Salah, Mbage Bawa, Salah Adlat, Iram Yasmin, Ayman Abdallah, Bin QiAbstractIn this work, three-dimensional nitrogen-doped porous graphene aerogel (NPGA) was easily synthesized via one-step hydrothermal reduction by mixing graphene oxide (GO) with p-phenylenediamine (PPD) and ammonia solution and then followed by freeze-dried. The NPGA sample was studied by different techniques such as SEM, TEM, nitrogen adsorption-desorption isotherms, XRD, XPS, and electrochemical measurements. NPGA composite exhibits a microporous w...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Hetero nanostructured iron oxide and bentonite clay composite assembly for the determination of an antiviral drug acyclovir
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Nagaraj P. Shetti, Shweta J. Malode, Deepti S. Nayak, Revati R. Naik, Girish T. Kuchinad, Kakarla R. Reddy, Shyam S. Shukla, Tejraj M. AminabhaviAbstractFabrication of chemically modified electrodes for a variety of applications has gained much interest in sensor applications. In search of new materials, carbon paste electrodes (CPEs) loaded with one or more nanoparticles have shown good results for the trace detection of molecules. In this research, a blend of bentonite clay particles and γ-Fe2O3 nanoparticles were employed as a modifier ...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Phthalate acid esters (PAEs) in highly acidic juice packaged in polyethylene terephthalate (PET) container: Occurrence, migration and estrogenic activity-associated risk assessment
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Leila Arfaeinia, Sina Dobaradaran, Farzaneh Nasrzadeh, Shiva Shamsi, Yousef Poureshgh, Hossein ArfaeiniaAbstractThe present study aimed to investigate the concentration of PAEs, their migration from the walls of PET containers into highly acidic juices (such as lemon juice, vinegar, and verjuice) and the risk assessment based on the estrogenic potential of these widespread pollutants. We analyzed and quantified six priority compounds of PAEs, including dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n‑butyl phthalate (DnBP), butyl benzyl...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Determination of multi-class emerging contaminants in sludge and recovery materials from waste water treatment plants: Development of a modified QuEChERS method coupled to LC–MS/MS
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Barbara Benedetti, Mauro Majone, Chiara Cavaliere, Carmela Maria Montone, Francesco Fatone, Nicola Frison, Aldo Laganà, Anna Laura CapriottiAbstractRecycling and recovering valuable resources from wastewater treatment plants is an important aspect in circular economy. The safe use of sludge and sludge-related products deriving from wastewater treatment strictly depends on their chemical contamination, especially by emerging pollutants. In this work, an analytical method was developed for the determination of a range of selected compounds,...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Development of voltammetric methods for antioxidant activity determination based on Fe(III) reduction
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Ferenc T. Pastor, Dejan M. Šegan, Stanislava Ž. Gorjanović, Ana M. Kalušević, Desanka Ž. SužnjevićAbstractNumerous methods have been developed for determination of antioxidant (AO) activity in vitro, but only several spectrophotometrical assays are frequently applied. Among them, probably the most simple is FRAP assay, based on the reduction of Fe(III) to Fe(II) by antioxidants. In this work the applicability of that reaction for the development of electrochemical method for AO activity determination was examined. The two com...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Photocatalytic activity of AgInS2 quantum dots upon visible light irradiation for melatonin determination through its reactive oxygen species scavenging effect
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): David S.M. Ribeiro, Rafael C. Castro, José X. Soares, João L.M. SantosAbstractIn this work, the ability of thiomalic acid (TMA)-capped AgInS2 quantum dots to generate reactive oxygen species (ROS) upon irradiation with visible light was investigated, which led to the subsequent development of a luminol-based chemiluminometric method for the monitoring of melatonin (MLT) in commercial dietary supplements. The developed approach was based on the antioxidant properties of melatonin conferred by the electron-rich aromatic indole ring w...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Visible-light photoelectrochemical sensor for glutathione based on CoFe2O4-nanosphere-sensitized copper tetraaminophthalocyanine–graphene oxide
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Wenfeng Zhuge, Xiaokun Li, Suxiang FengAbstractSimple, fast, and sensitive detection methods are required for reduced glutathione (GSH), a metabolic substance that acts as an indicator for a variety of diseases and is also found in numerous supplements and drugs. Herein, a sensitive and selective photoelectrochemical (PEC) sensor was developed for GSH detection. The novel PEC sensor was fabricated using CoFe2O4 nanoporous spheres and copper tetraaminophthalocyanine–graphene oxide (CuTAPc-GO) as photoelectric materials. Under illumination, ...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Multi-channel electroanalysis of As (III), Hg and Cu in the complex matrix of Bombyx batryticatus after pre-purification
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Huixin Yan, Dandan Kong, Xinyue Li, Jiaoyang Luo, Zhuowen Fan, Meihua YangAbstractThe resources of animal medicinal materials have gradually attracted the attention of people around the world, however, the increase of heavy metals in animal medicine possesses a serious threat to human health. A multi-channel analysis technique with high accuracy and sensitivity become more urgent and necessary, particularly in such complex animal matrix which contains various interference components. Here, a multi-channel analysis strategy for the detection of A...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Postmortem determination of HbA1c and glycated albumin concentrations using the UHPLC-QqQ-MS/MS method for the purposes of medicolegal opinions
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Karolina Nowak, Marcin Zawadzki, Tomasz JurekAbstractPostmortem diagnosis of hyperglycaemia is a challenge in forensic medicine. Glycated haemoglobin (HbA1c) is considered one of the markers providing an alternative to postmortem determinations of glucose concentration. On the other hand, glycated albumin (GA) may be determined in cases of difficulty in determining HbA1c.The aim of this study was to implement and evaluate the usefulness of methods enabling determination of HbA1c an GA in postmortem material (HbA1c–peripheral blood, GA&ndas...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Material characterization and functional implications of a Claude Laurent glass flute
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): H. Bagán, G. Magkanas, M. Gascón, J.F. GarcíaAbstractThe Claude Laurent glass flutes (1805–1844) are singular elements that contributed to the transformation of musical instruments through the introduction of new styles and technologies. These flutes combine improved technical capabilities with aesthetic criteria, making them high-quality instruments and appreciated objects of art. Through the analysis of an 1823 flute, the present study is focused on the determination of their material characteristics and the relation...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

The examination of red lipsticks using microemulsion electrokinetic capillary chromatography
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Małgorzata Król, Marlena Nowak, Marta Gładysz, Paweł KościelniakAbstractLipsticks, due to their easy transfer and widespread use, can provide important evidence in crime investigations, in particular in cases of rape, murder or burglary. Discrimination between and identification of lipstick samples is a challenge because of their similar chemical composition. The main components of lipsticks – oils and waxes – are a difficult matrix to analyse. Furthermore, lipsticks contain various additional compounds, both ionic and neu...
Source: Microchemical Journal - February 21, 2020 Category: Chemistry Source Type: research

Enhanced response of benzo[6]urils sustained by graphene oxide for umbelliferones and its applications for quantitative detection of diquat
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Yan Yan, Man Chen, Qingmei Ge, Hang Cong, Ying Fan, Lin Sun, Mao Liu, Zhu TaoAbstractThe composites of benzo[6]uril-hybridized graphene oxide were realized with the full characterization of atomic force microscopy (AFM), Infrared spectroscopy (IR), and Raman spectroscopy, which exhibited dramatical improvement of the fluorescence response to the supramolecular interactions of umbelliferones with the macrocyclic compounds to produce the ternary supramolecular hybrid materials, and the host-guest interactions were evidenced with 1H NMR, fluorescen...
Source: Microchemical Journal - February 19, 2020 Category: Chemistry Source Type: research

A dual-mode colorimetric and SERS detection of hydrogen sulfide in live prostate cancer cells using a silver nanoplate-coated paper assay
We report a simple and facile paper assay based on silver nanoplates (Ag NPls) for the colorimetric and surface-enhanced Raman scattering (SERS) dual-mode detection of hydrogen sulfide (H2S) gas released from live cancer cells. Ag NPls were prepared via seed-mediated growth and dropped on detection zones within the poly(dimethylsiloxane)-patterned paper substrate. The blue-colored Ag NPls on the paper react with H2S to form brown-colored silver sulfide, which simultaneously decreases SERS activity of Ag NPls. We quantitatively analyzed the color and Raman signal intensity changes in Ag NPl-coated detection zone on the pape...
Source: Microchemical Journal - February 19, 2020 Category: Chemistry Source Type: research

Dehydroacetic acid derived Schiff base as selective and sensitive colorimetric chemosensor for the detection of Cu(II) ions in aqueous medium
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Devika Vashisht, Shikha Sharma, Rakesh Kumar, Vaneet Saini, Vikram Saini, Alex Ibhadon, Subash Chandra Sahoo, Shweta Sharma, Surinder Kumar Mehta, Ramesh KatariaAbstractThe deficiency, as well as overconsumption of essential metal ions, has serious health implications. Hence, the design and synthesis of sensors for detection of such ionic species are of great significance. In this work, a Dehydroacetic acid-based chemosensor DHB ((E)-N-(1-(2-hydroxy-6-methyl-4-oxo-4H-pyran-3-yl) ethylidene benzohydrazide) was developed for instant detection of C...
Source: Microchemical Journal - February 19, 2020 Category: Chemistry Source Type: research

Voltammetric sensing of E,E-dienestrol in fish tissue by combining a cathodically pretreated boron-doped diamond electrode and QuEChERS extraction method
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Alyson S. Medeiros, Daniel B. Silva, André O. Santos, Suely S.L. Castro, Thiago M.B.F. OliveiraAbstractFood quality control has been a pressing issue in recent years and demands the development of efficient and versatile analytical methods. This paper describes a promising voltammetric assay to monitor the synthetic estrogen E,E-dienestrol (E,E-DNL) in fish tissue, using a cathodically pretreated boron-doped diamond (Cpt-BDD) electrode in combination with QuEChERS extraction method. The electrochemical reactivity of E,E-DNL on Cpt-BDD ele...
Source: Microchemical Journal - February 19, 2020 Category: Chemistry Source Type: research

Sensitive voltammetric determination of riboflavin in pharmaceutical and biological samples using FSN-Zonyl-Nafion modified carbon paste electrode
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Cristina Stefanov, Catalina Cioates Negut, Livia Alexandra Dinu Gugoasa, Jacobus (KOOS) Frederick van StadenAbstractAn anti-fouling bipolymeric membrane was used to modify a carbon nanoparticle paste electrode for the determination of riboflavin in real samples. This bipolymeric membrane was constructed from two polymers: perfluorate resin Nafion and fluorosurfactant Zonyl-FSN. Nafion membrane was used as an anti-fouling material and the Zonyl-FSN membrane was used for the enhancement of the electrocatalytic activity towards the electrooxidati...
Source: Microchemical Journal - February 19, 2020 Category: Chemistry Source Type: research

Aptasensors as promising new tools in bisphenol A detection - An invisible pollution in food and environment
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Seyed-Hossein Rajabnejad, Hasan Badibostan, Asma Verdian, Gholam Reza Karimi, Ebrahim Fooladi, Javad FeizyAbstractOwing to the endocrine disrupting effect, the detection of bisphenol A (BPA) is essential. Up to now, different chromatographic and spectroscopic analytical techniques have been developed for the detection of BPA, yet they are time-consuming, laborious and expensive. As a result, the development of a sensitive, specific and executive detection method seems vital. Recently, aptamers has been used as bioprobes of biosensors in a variet...
Source: Microchemical Journal - February 17, 2020 Category: Chemistry Source Type: research

Assessing the harmfulness of high-salinity oilfield-produced water related to trace metals using vortex-assisted dispersive liquid-liquid microextraction combined with inductively coupled plasma optical emission spectrometry
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Lívia Ferreira de Melo Guedes, Bernardo Ferreira Braz, Aline Soares Freire, Ricardo Erthal SantelliABSTRACTA method for quantifying trace levels of cadmium, lead, nickel and cobalt in high-salinity produced water (salinities up to 168) using vortex-assisted dispersive liquid-liquid microextraction (VA DLLME) combined with inductively coupled plasma optical emission spectrometry (ICP OES) was developed. Diethyldithiocarbamate (DDTC) was used as chelating agent, and complexes were extracted adding methanol (dispersive solvent) and carbon te...
Source: Microchemical Journal - February 15, 2020 Category: Chemistry Source Type: research

A novel chemiluminescent-based nano-probe for ultra-trace quantification of dopamine in human plasma samples
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Hossein Abdolmohammad-Zadeh, Monireh Zamani-KalajahiAbstractAn innovative chemiluminescence (CL)-based nano-probe was established for dopamine quantification by the enhancement of luminol–KMnO4 CL signal using a layered nanomaterial. The intensity of the CL signal was amplified by 18-folds using nickel-aluminum layered double hydroxide (Ni-Al LDH). The possible enhancement mechanism of the CL system in the presence of the nano-structured Ni-Al–NO3 LDH was discussed. The improved signal was diminished in the presence of dopamine owing...
Source: Microchemical Journal - February 15, 2020 Category: Chemistry Source Type: research

AuNPs/PpPD/PEDOT:PSS-Fc modified screen-printed carbon electrode label-free immunosensor for sensitive and selective determination of human serum albumin
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Jittima Choosang, Panote Thavarungkul, Proespichaya Kanatharana, Apon NumnuamAbstractA novel, label-free immunosensor was fabricated for human serum albumin (HSA) detection in urine and human serum. A screen-printed carbon electrode (SPCE) was modified with a poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) and ferrocene nanocomposite (PEDOT: PSS-Fc) which was first coated with poly(para-phenylenediamine) (PpPD) and then functionalized with gold nanoparticles (AuNPs). Anti-human serum albumin (anti-HSA) was immobilized on the AuNPs/PpP...
Source: Microchemical Journal - February 15, 2020 Category: Chemistry Source Type: research

Factors affecting the practicality of solid-phase microextraction VOC analysis of artworks featuring polymeric materials in open environments
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): M. Kearney, J.H. Townsend, I.P. Parkin, M. Hidalgo, K. CurranAbstractCurrently there is no proven method for in-situ monitoring of the decay progression of objects featuring polymeric materials. One potential method which is gaining traction, is the analysis of volatile organic compounds (VOC) via solid phase microextraction gas chromatography mass spectrometry (SPME-GC/MS). Few studies have focused on repeated, long-term monitoring of objects in open heritage environments via SPME-GC/MS. Specifically, the combined effects on methodological perf...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

Historical development of simulated body fluids used in biomedical applications: A review
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Bengi Yilmaz, Ahmet Engin Pazarceviren, Aysen Tezcaner, Zafer EvisAbstractSimulated body fluid (SBF) is an acellular, protein-free, supersaturated calcium-phosphate solution with ionic composition nearly equal to that of human blood plasma and generally buffered at physiological conditions (pH 7.4 and 36.5ºC). Various SBF formulations have been used for decades to: (1) test corrosion and bone-bonding behavior, bioactivity, ion release, swelling and biodegradation rates of biomaterials and (2) deposit calcium phosphates, especially hydroxyap...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

Liquid phase microextraction based sensitive analytical strategy for the determination of 22 hazardous aromatic amine products of azo dyes in wastewater and tap water samples by GC-MS system
This study presents a comprehensive optimization and validation of a dispersive liquid-liquid microextraction (DLLME) method for the preconcentration of 22 aromatic amines in gas chromatography spectrometry system. DLLME parameters including dispersive solvent, extraction solvent and salting-out effect were optimized in a univariate approach to obtain optimum conditions of the method. An isotopically labeled compound (bisphenol A D-16) was used as internal standard to enhance the precision (R2) of calibration plot from 0.9952 – 0.9994 to 0.9991 – 0.9999. The limits of detection calculated for the analytes were ...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

Flexible printed paper electrode with silver nano-ink for electrochemical applications
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Tushar Kant, Kamlesh Shrivas, Vellaichamy Ganesan, Yugal Kishor Mahipal, Rama Devi, Manas Kanti Deb, Ravi ShankarAbstractDevelopment of low-cost paper based disposable electrodes printed with silver nano-ink using desktop inkjet printer is reported in this work. A stable nano-ink was prepared by dissolving 3% silver nanoparticles (AgNPs) capped with polyvinylpyrrolidone (PVP) in ethanol as a dispersing solvent. Highly stable silver nano-ink with surface tension of 21.1 mN/M and viscosity of 2.6 mPa.S was prepared for printing on photo paper that...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

A validated LC–MS/MS method for the quantification of amlodipine, bisoprolol, enalapril and enalaprilat—Application to pharmacokinetic study in healthy volunteers
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Liliya Logoyda, Sergiy Kovalenk, Moustafa Gaafar, Ahmed M. Abdel-Megied, Fawzy A. ElbarbryAbstractIn this work, a highly sensitive and rapid liquid chromatography-tandem mass spectrometry (LC–MS/MS) method for the simultaneous determination of amlodipine (AML), bisoprolol (BIS) and enalapril maleate (ENA) in the presence of its metabolite enalaprilat (ENT) in real human plasma was developed and validated using felodipine, propranolol, ramipril, and captopril, as internal standards (IS), respectively. The prepared samples were chromatograph...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

An ultrasensitive electrochemical platform based on imprinted chitosan/gold nanoparticles/graphene nanocomposite for sensing cadmium (II) ions
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Shuping Wu, Kanghui Li, Xiangzi Dai, Zihang Zhang, Fuyuan Ding, Songjun LiAbstractAn ultrasensitive electrochemical platform based on imprinted chitosan/gold nanoparticles/graphene modified glassy carbon electrode (CS/AuNPs/GR/GCE) has been used for sensing cadmium in drinking water and milk samples. The CS/AuNPs/GR/GCE platform showed high sensitivity for the determination of cadmium due to the excellent conductivity and the accelerated electron transfer by AuNPs and GR. Under the optimized conditions, the linear range of the fabricated electro...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

Fluorescent immunochromatographic assay for quantitative detection of the foot-and-mouth disease virus serotype O antibody
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Fengping Hou, Manyuan Bai, Yun Zhang, Haiyun Liu, Shiqi Sun, Huichen GuoAbstractUltrasensitive and quantitative real-time detection of infectious disease has long been a challenge in prevention and diagnosis of epidemic disease. It's essential to develop a quantitative point-of-care (POC) diagnostic approach. Herein, a fluorescent platform was designed, which was a sandwich type and applied noninfectious virus-like-particles (VLPs) as capture antigen, making the process safer and more efficient. The fluorescent europium microparticles (EuMSs) co...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

Analytical study of Delftware's reproductions
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Helena J.M. WoutersAbstractThe famous Dutch Delftware was often reproduced in an expert manner, so that based on only connoisseurship it is difficult to come to definitive conclusions about the provenance of tin-glaze objects even for museums with major collections. Amongst others, the French faïencerie Géo Martel was known as one of the largest manufactories of “à la façon de” Delft faience during the early 20th century. In parallel to the analytical research of the white tin-glaze and blue on-glaze decorat...
Source: Microchemical Journal - February 14, 2020 Category: Chemistry Source Type: research

Selective resonance Rayleigh scattering spectroscopic determination of persulfate using cetyl trimethylammonium bromide capped cuo nanograins
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Mayada Qasem, Riham El Kurdi, Digambara PatraAbstractThe authors were able successfully to produce uniform copper oxide nanograins (CuO NGs) using cetyl trimethylammonium bromide as capping agent. These nanograins were developed to design a new nanoprobe that will be able to determine persulfate anions in water sample based on Resonance Rayleigh Scattering (RRS) Technique. CuO NGs nanosensor were found to be selective for the detection of persulfate anions in the concentration range of 1–100 μM with a detection limit equal to 1.03 μM...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

Nanostructured transition metal chalcogenide embedded on reduced graphene oxide based highly efficient biosensor for cardiovascular disease detection
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Dipti Chauhan, Pooja, Vishakha Nirbhaya, Chandra Mohan Srivastava, Ramesh Chandra, Suveen KumarAbstractHerein, we report nanostructured metal chalcogenide (molybdenum tetraselenide, nMo3Se4) embedded on reduced graphene oxide (rGO) based electrochemical immunosensor for cardiovascular disease biomarker [cardiac troponin I (cTnI)] detection. The nanostructured molybdenum tetraselenide-reduced graphene oxide (nMo3Se4-rGO) was synthesized via low temperature hydrothermal method and further functionalization was carried out using 3-aminopropyltrieth...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

Bimetallic Ag–Au nanoparticles as pH dependent dual sensing probe for Mn(II) ion and ciprofloxacin
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Jaise Mariya George, Ragam N. Priyanka, Beena MathewAbstractA facile and eco-friendly method for the synthesis of bimetallic nanoparticles of two coinage metals such as silver and gold ((Ag–Au)mixNP) are detailed in this paper. β-cyclodextrin mediated microwave method was used for the synthesis of bimetallic nanoparticles in aqueous medium. Under the optimal conditions, the addition of Mn(II) ion and ciprofloxacin (CIP) changed the colour and surface plasmon resonance of the (Ag–Au)mixNP. The pH dependent changes associated with...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

Fabrication of triazine based colorimetric and electrochemical sensor for the quantification of Co2+ ion
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): J. Jone Celestina, P. Tharmaraj, A. Jeevika, C.D. SheelaAbstractTriazine based Schiff base was synthesized by sonochemical method and it was explored for the robust selective and sensitive determination of Co2+ by both colorimetry and electrochemical sensing. Selectivity studies were carried out with different metal ions and found that the proposed chemosensor has significant selectivity for the detection of Co2+ with the colour change from yellow to blue owing to the formation of complex with Co2+.The colorimetric sensitivity studies of BNHNTA ...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

Enhanced electrochemical enantiorecognition of tryptophan enantiomers based on synergistic effect of porous β-CD-containing polymers and multiwalled carbon nanotubes
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Xuerui Liu, Shengxiao Zhang, Hui Xu, Yahui Zhang, Lina Dong, Shanmin Gao, Linlin Zhong, Tingting JiangAbstractPorous β-CD-containing polymers (P-CDPs), the polymerization product of β-CD and tetrafluoroterephthalonitrile, demonstrate the high surface area and permanent porosity, which has been applied in removal of organic micropollutants and sulfides by molecular recognition. In this manuscript, an enhanced electrochemical enantioselective platform for tryptophan (Trp) enantiomers was constructed by layer by layer assembly of multiwal...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

An applied complementary use of macro X-ray fluorescence scanning and multi-light reflectance imaging to study Medieval Illuminated Manuscripts. The Rijmbijbel of Jacob van Maerlant
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): L. Watteeuw, M. Van Bos, T. Gersten, B. Vandermeulen, H. HameeuwAbstractThe colorful images in medieval manuscripts have striking characteristics that need meticulous approaches during art technical research in situ, as no sampling is permitted. Visual inspections and images with the microscope can reveal details about techniques and layers of the miniature. In this experimental research we applied two complementary techniques to reveal the pigments the artists used to create the folios of a famous Flemish illuminated manuscript, the Rijmbijbel ...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

An efficient graphene/graphite paste sensor chemically modified by diphenylcarbazone for the detection of Al(III) ions in real water samples
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Fakiha El-Taib Heakal, Marwa El Badry Mohamed, Mostafa Mohamed SolimanAbstractThese days development of efficient, selective and fast sensors for micro-determination of Al(III) in different samples is a highly demanding area of research. This is because aluminum intake is reported to have serious negative impact on human health. In this paper, a new electrochemical Al(III) sensor is developed based on a chemically modified carbon paste electrode with graphene nanosheets and diphenylcarbazone (DPC) ionophore. This sensor is chosen based on its hi...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

The polystyrene-divinylbenzene stationary phase modified with poly (Amine-Epichlorohydrin) for ion chromatography
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Zhongping Huang, Chun Zhuge, Qiulian Zhu, Huijun Liu, Yuanbin She, Yan ZhuAbstractA novel anion exchange stationary phase was synthesized based on polystyrene-divinylbenzene beads and poly (amine-epichlorohydrin) cationic polyelectrolyte. Epichlorohydrin and methylamine as monomers were used to prepare quaternized cationic polyelectrolyte and hyperbranched layers with a denser charged density and high hydrophilcity. Scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), Fourier transform infrared spectra (FTIR) and element...
Source: Microchemical Journal - February 13, 2020 Category: Chemistry Source Type: research

Multidisciplinary approach for time-framing of an overpainted wooden iconostasis from Southern Romania
In this study several non-invasive and minimally-invasive techniques were employed for the discovery of the original aspect of an old iconostasis belonging to a small wooden church in Vâlcea County (southern Romania). Preliminary examination of the iconostasis raised suspicions upon its actual age, the wooden carved decorations style pointing towards the Brancovan period, while images in raking light highlighted old lacunae painted over. Hyperspectral imaging and X-ray Fluorescence investigations were performed in situ, while Fourier-Transform Infrared Spectroscopy and microscopic examination were performed on severa...
Source: Microchemical Journal - February 11, 2020 Category: Chemistry Source Type: research

Point discharge microplasma for the determination of mercury in Traditional Chinese Medicines by chemical vapor generation atomic emission spectrometry
Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Xin Yuan, Kejun Li, Yutian Zhang, Yuting Miao, Yu Xiang, Ying Sha, Mei Zhang, Ke HuangAbstractA miniaturized analysis system based on a low power point discharge (PD) microplasma is described for mercury detection in Traditional Chinese Medicines (TCM) by chemical vapor generation atomic emission spectrometry (CVG-AES). The PD microplasma utilized a stainless-steel hollow needle as one of the electrodes, which also acts as the channel for the plasma gas and Hg vapor to enter the discharge region. This design allows the Hg vapor all transported a...
Source: Microchemical Journal - February 11, 2020 Category: Chemistry Source Type: research