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International Journal of Analytical Chemistry

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https://www.readbyqxmd.com/read/28316627/green-synthesis-and-characterization-of-silver-nanoparticles-using-citrullus-lanatus-fruit-rind-extract
#1
Michael Ndikau, Naumih M Noah, Dickson M Andala, Eric Masika
The wide-scale application of silver nanoparticles (AgNPs) in areas such as chemical sensing, nanomedicine, and electronics has led to their increased demand. Current methods of AgNPs synthesis involve the use of hazardous reagents and toxic solvents. There is a need for the development of new methods of synthesizing AgNPs that use environmentally safe reagents and solvents. This work reports a green method where silver nanoparticles (AgNPs) were synthesized using silver nitrate and the aqueous extract of Citrullus lanatus fruit rind as the reductant and the capping agent...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28316626/evaluation-of-phenolic-compounds-and-antioxidant-and-antimicrobial-activities-of-some-common-herbs
#2
Muhammad Abdul Qadir, Syeda Kiran Shahzadi, Asad Bashir, Adil Munir, Shabnam Shahzad
The study was designed to evaluate the phenolic, flavonoid contents and antioxidant and antimicrobial activities of onion (Allium cepa), garlic (Allium sativum), mint (Mentha spicata), thyme (Thymus vulgaris), oak (Quercus), aloe vera (Aloe barbadensis Miller), and ginger (Zingiber officinale). All extracts showed a wide range of total phenolic contents, that is, 4.96 to 98.37 mg/100 g gallic acid equivalents, and total flavonoid contents, that is, 0.41 to 17.64 mg/100 g catechin equivalents. Antioxidant activity (AA) was determined by measuring reducing power, inhibition of peroxidation using linoleic acid system, and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) scavenging activity...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28298926/identification-and-quantification-of-glucosinolates-in-kimchi-by-liquid-chromatography-electrospray-tandem-mass-spectrometry
#3
Ho Jin Kim, Mi Jin Lee, Min Hee Jeong, Jang Eok Kim
A novel and simple method for detecting five glucosinolates (glucoalyssin, gluconapin, glucobrassicanapin, glucobrassicin, and 4-methoxyglucobrassicin) in kimchi was developed using liquid chromatography-electrospray tandem mass spectrometry (LC-MS/MS). The chromatographic peaks of the five glucosinolates were successfully identified by comparing their retention times, mass spectra. The mobile phase was composed of A (acetonitrile) and B (water). As for glucosinolate, the relative quantities were found through sinigrin, and five different compounds that have not been previously discovered in kimchi were observed...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28298925/particle-morphology-analysis-of-biomass-material-based-on-improved-image-processing-method
#4
Zhaolin Lu, Xiaojuan Hu, Yao Lu
Particle morphology, including size and shape, is an important factor that significantly influences the physical and chemical properties of biomass material. Based on image processing technology, a method was developed to process sample images, measure particle dimensions, and analyse the particle size and shape distributions of knife-milled wheat straw, which had been preclassified into five nominal size groups using mechanical sieving approach. Considering the great variation of particle size from micrometer to millimeter, the powders greater than 250 μm were photographed by a flatbed scanner without zoom function, and the others were photographed using a scanning electron microscopy (SEM) with high-image resolution...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28293261/determination-of-ten-corticosteroids-in-illegal-cosmetic-products-by-a-simple-rapid-and-high-performance-lc-ms-ms-method
#5
Vita Giaccone, Giuseppe Polizzotto, Andrea Macaluso, Gaetano Cammilleri, Vincenzo Ferrantelli
The aim of our present work was the development of a rapid high-performance liquid chromatography method with electrospray ionization and tandem mass spectrometry detection (LC-ESI-MS/MS) for the determination of several corticosteroids in cosmetic products. Corticosteroids are suspected to be illegally added in cosmetic preparations in order to enhance the curative effect against some skin diseases. Sample preparation step consists in a single extraction with acetonitrile followed by centrifugation and filtration...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28286520/acetylcholinesterase-inhibitors-assay-using-colorimetric-ph-sensitive-strips-and-image-analysis-by-a-smartphone
#6
Adam Kostelnik, Alexander Cegan, Miroslav Pohanka
Smartphones are widely spread and their usage does not require any trained personnel. Recently, smartphones were successfully used in analytical chemistry as a simple detection tool in some applications. This paper focuses on immobilization of acetylcholinesterase (AChE) onto commercially available pH strips with stabilization in the gelatin membrane. AChE degrades acetylcholine into choline and acetic acid which causes color change of acid-base indicator. Smartphone served as a tool for measurement of indicator color change from red to orange while inhibitors blocked this process...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28280510/determination-of-levels-of-organochlorine-organophosphorus-and-pyrethroid-pesticide-residues-in-vegetables-from-markets-in-dar-es-salaam-by-gc-ms
#7
John A M Mahugija, Farhat A Khamis, Esther H J Lugwisha
This study investigated the levels of pesticides and metabolites in vegetables from major markets in Dar es Salaam city, Tanzania. Samples of fresh cabbage, spinach, and onions from the markets were analysed for pesticide residues. Extraction was performed using acetone followed by dichloromethane : cyclohexane mixture and the extracts were cleaned up using Florisil. The compounds were determined by gas chromatography-mass spectrometry (GC-MS). Pesticides and metabolites were detected in 72.2% of the samples...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28250771/the-influence-of-electrolytic-concentration-on-the-electrochemical-deposition-of-calcium-phosphate-coating-on-a-direct-laser-metal-forming-surface
#8
Qianyue Sun, Yuhui Yang, Wenjing Luo, Jinghui Zhao, Yanmin Zhou
A calcium phosphate (CaP) coating on titanium surface enhances its biocompatibility, thus facilitating osteoconduction and osteoinduction with the inorganic phase of the human bone. Electrochemical deposition has been suggested as an effective means of fabricating CaP coatings on porous surface. The purpose of this study was to develop CaP coatings on a direct laser metal forming implant using electrochemical deposition and to investigate the effect of electrolytic concentration on the coating's morphology and structure by X-ray diffraction, scanning electron microscopy, water contact angle analysis, and Fourier transform infrared spectroscopy...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28250770/chemical-compositional-analysis-of-catalytic-hydroconversion-products-of-heishan-coal-liquefaction-residue
#9
Xiaoming Yue, Yajun Wu, Shuangquan Zhang, Xiaoqin Yang, Xianyong Wei
Liquefaction residue of Heishan bituminous coal (HLR) was subject to two hydroconversion reactions under 5 MPa initial pressure of hydrogen at 300°C for 3 h, without catalyst and with acid supported catalyst (ASC), respectively. The reaction products were analyzed with gas chromatography/mass spectrometer (GC/MS). The results show that 222 organic compounds were detected totally in the products and they can be divided into alkanes, aromatic hydrocarbons (AHCs), phenols, ketones, ethers, and other species (OSs)...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28246529/simultaneous-determination-and-stability-studies-on-diminazene-diaceturate-and-phenazone-using-developed-derivative-spectrophotometric-method
#10
Ruaa Mohamed Akode, Shaza Wagiealla Shantier, Elrasheed Ahmed Gadkariem, Magdi Awadalla Mohamed
This work presents UV first derivative spectrophotometry as a precise, accurate, and feasible method for simultaneous determination of diminazene diaceturate and phenazone in bulk and dosage forms. The absorbance values of diminazene diaceturate and phenazone aqueous mixture were obtained at 398 nm and 273 nm, respectively. The developed method was proved to be linear over the concentration ranges (2-10) μg/mL and (2.496-12.48) μg/mL for diminazene diaceturate and phenazone, respectively, with good correlation coefficients (not less than 0...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28243255/quantitative-analysis-of-volatile-impurities-in-diallyldimethylammonium-chloride-monomer-solution-by-gas-chromatography-coupled-with-liquid-liquid-extraction
#11
Cheng Liu, Yuejun Zhang, Haiying Wang, Weixin Wang
The quantitative analysis method for volatile impurities in diallyldimethylammonium chloride (DADMAC) monomer solution was established in this paper. The volatile impurities were quantitatively analyzed with trichloromethane as extraction solvent and n-hexane as internal standard by using gas chromatography (GC) coupled with solvent extraction, and the chromatographic conditions, quantitative methods, and extraction conditions were systematically investigated in detail. The results showed that excellent linear relationships of 5 volatile impurities (dimethylamine, allyldimethylamine, allyl chloride, allyl alcohol, and allyl aldehyde) were obtained in the range of 1-100 mg·L(-1)...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28115935/simultaneous-determination-of-bergapten-imperatorin-notopterol-and-isoimperatorin-in-rat-plasma-by-high-performance-liquid-chromatography-with-fluorescence-detection-and-its-application-to-pharmacokinetic-and-excretion-study-after-oral-administration-of-notopterygium
#12
John Teye Azietaku, Xie-An Yu, Jin Li, Jia Hao, Jun Cao, Mingrui An, Zhijing Tan, Yan-Xu Chang
A specific, sensitive, and reliable high performance liquid chromatography with fluorescence detection (HPLC-FLD) was first optimized and then used in the simultaneous quantification of bergapten, imperatorin, notopterol, and isoimperatorin in rat plasma using osthole as the internal standard. Liquid-liquid extraction with ethyl acetate was employed in treating the rat plasma samples obtained. Separation was carried out with a Hedera™ ODS column (4.6 × 250 mm, 5 μm) by gradient elution at a temperature of 40°C...
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28115934/trace-detection-of-metalloporphyrin-based-coordination-polymer-particles-via-modified-surface-enhanced-raman-scattering-assisted-by-surface-metallization
#13
Yu Sun, Alessio Caravella
This study proposed a facile method to detect metalloporphyrin-based coordination polymer particles (Z-CPPs) in aqueous solution by modified surface-enhanced Raman scattering (SERS). The SERS-active particles are photodeposited on the surface of Z-CPPs, offering an enhanced Raman signal for the trace detection of Z-CPPs.
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28101104/application-of-long-range-surface-plasmon-resonance-for-abo-blood-typing
#14
Wanida Tangkawsakul, Toemsak Srikhirin, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Akira Baba
In this study, we demonstrate a long-range surface plasmon resonance (LR-SPR) biosensor for the detection of whole cell by captured antigens A and B on the surface of red blood cells (RBCs) as a model. The LR-SPR sensor chip consists of high-refractive index glass, a Cytop film layer, and a thin gold (Au) film, which makes the evanescent field intensity and the penetration depth longer than conventional SPR. Therefore, the LR-SPR biosensor has improved capability for detecting large analytes, such as RBCs. The antibodies specific to blood group A and group B (Anti-A and Anti-B) are covalently immobilized on a grafting self-assembled monolayer (SAM)/Au surface on the biosensor...
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28044079/determination-of-spatial-chromium-contamination-of-the-environment-around-industrial-zones
#15
Dereje Homa, Ermias Haile, Alemayehu P Washe
This study was conducted to determine the spatial levels of chromium contamination of water, agricultural soil, and vegetables in the leather tanning industrial areas using spectrophotometric methods. The results showed elevated accumulation of total Cr ranging from 10.85 ± 0.885 mg/L to 39.696 ± 0.326 mg/L, 16.225 ± 0.12 mg/Kg to 1581.667 ± 0.122 mg/Kg, and 1.0758 ± 0.05348 mg/Kg to 11.75 ± 0.206 mg/Kg in water, agricultural soil, and vegetable samples, respectively. The highest levels of chromium (VI) found from the speciation study were 2...
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28025596/corrigendum-to-extraction-of-hcv-rna-from-plasma-samples-development-towards-semiautomation
#16
Imran Amin, Tania Jabbar, Fawad Ali, Muhammad Saeed Akhtar
[This corrects the article DOI: 10.1155/2015/367801.].
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/27974892/cauliflower-leave-an-agricultural-waste-biomass-adsorbent-and-its-application-for-the-removal-of-mb-dye-from-aqueous-solution-equilibrium-kinetics-and-thermodynamic-studies
#17
Seraj Anwar Ansari, Fauzia Khan, Anees Ahmad
Cauliflower leaf powder (CLP), a biosorbent prepared from seasonal agricultural crop waste material, has been employed as a prospective adsorbent for the removal of a basic dye, methylene blue (MB) from aqueous solution by the batch adsorption method under varying conditions, namely, initial dye concentration, adsorbent dose, solution pH, and temperature. Characterization of the material by FTIR and SEM indicates the presence of functional groups and rough coarse surface suitable for the adsorption of methylene blue over it...
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/27829835/innovative-monitoring-of-atmospheric-gaseous-hydrogen-fluoride
#18
Stefano Dugheri, Alessandro Bonari, Ilenia Pompilio, Alessandro Monti, Nicola Mucci, Giulio Arcangeli
Hydrogen fluoride (HF) is a basic raw material for a wide variety of industrial products, with a worldwide production capacity of more than three million metric tonnes. A novel method for determining particulate fluoride and gaseous hydrogen fluoride in air is presented herewith. Air was sampled using miniaturised 13 mm Swinnex two-stage filter holders in a medium-flow pumping system and through the absorption of particulate fluoride and HF vapours on cellulose ester filters uncoated or impregnated with sodium carbonate...
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/27781067/quantitative-scrutinization-of-aflatoxins-in-different-spices-from-pakistan
#19
Narjis Naz, Aiza Kashif, Kinza Kanwal, Abdul Muqeet Khan, Mateen Abbas
The current research work aimed to access the contamination level of aflatoxins B1, B2, G1, and G2 in the household spices that are widely consumed in huge amounts. 200 different spice samples, 100 packed and 100 unpacked, were analyzed for the aflatoxins profile by HPLC with an incidence of 61.5% contamination out of which 53.66% samples exceed the EU limit. The results disclosed that the unpacked samples are more contaminated as compared to the packed samples except for white cumin seeds. Among packed and unpacked samples of spices, the maximum value of aflatoxins was detected in fennel, that is, 27...
2016: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/27688770/a-high-throughput-size-exclusion-chromatography-method-to-determine-the-molecular-size-distribution-of-meningococcal-polysaccharide-vaccine
#20
Imran Khan, K M Taufiqur Rahman, S M Saad Us Siraj, Mahbubul Karim, Abdul Muktadir, Arpan Maheshwari, Md Azizul Kabir, Zebun Nahar, Mohammad Mainul Ahasan
Molecular size distribution of meningococcal polysaccharide vaccine is a readily identifiable parameter that directly correlates with the immunogenicity. In this paper, we report a size exclusion chromatography method to determine the molecular size distribution and distribution coefficient value of meningococcal polysaccharide serogroups A, C, W, and Y in meningococcal polysaccharide (ACWY) vaccines. The analyses were performed on a XK16/70 column packed with sepharose CL-4B with six different batches of Ingovax® ACWY, a meningococcal polysaccharide vaccine produced by Incepta Vaccine Ltd...
2016: International Journal of Analytical Chemistry
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