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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/28656123/determination-of-epimedin-b-in-rat-plasma-and-tissue-by-lc-ms-ms-application-in-pharmacokinetic-and-tissue-distribution-studies
#1
Qianru Feng, Shunjun Xu, Jiejing Yu, Shuai Sun, Liu Yang
A simple, sensitive, and specific liquid chromatography tandem mass-spectrometric method was developed and validated for the determination of epimedin B in rat plasma and tissue samples. After being processed with a protein precipitation method, these samples were separated on an Agilent Eclipse XDB-C18 column with an isocratic mobile phase consisting of acetonitrile and 0.1% formic acid aqueous solution (32 : 68, v/v). The calibration curve of epimedin B was linear over the concentration range from 1 to 500 ng/mL in plasma and tissue homogenate...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28656122/uplc-tandem-mass-spectrometry-method-for-simultaneous-determination-of-fluoxetine-risperidone-and-its-active-metabolite-9-hydroxyrisperidone-in-plasma-application-to-pharmacokinetics-study-in-rats
#2
Essam Ezzeldin, Nisreen F Abo-Talib, Marwa H Tammam
Risperidone (RIS) is used as an antipsychotic drug alone or with other drugs, like fluoxetine (FLX). A simple method was developed and validated for the determination of both RIS and its metabolite 9-hydroxyrisperidone (9-OH-RIS), FLX, and olanzapine (OLA) as an internal standard in rat's plasma using UPLC-MS/MS. FLX, RIS, 9-OH-RIS, and OLA were purified using acetonitrile as a protein precipitating agent. Separation was performed on an ACQUITY™ "UPLC BEH™" C18 column (50 mm × 2.1 mm i.d., 1.7 μm; Waters Corp...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28656121/quantitative-and-qualitative-characterization-of-gentiana-rigescens-franch-gentianaceae-on-different-parts-and-cultivations-years-by-hplc-and-ftir-spectroscopy
#3
Lu-Ming Qi, Ji Zhang, Yan-Li Zhao, Zhi-Tian Zuo, Hang Jin, Yuan-Zhong Wang
Gentiana rigescens Franch (Gentianaceae) is a famous medicinal plant for treatments of rheumatism, convulsion, and jaundice. Comprehensive investigation of different parts and cultivation years of this plant has not yet been conducted. This study presents the quantitative and qualitative characterization of iridoid glycosides from G. rigescens performed by HPLC and FTIR spectroscopy techniques. The accumulations of loganic acid, swertiamarin, gentiopicroside, and sweroside were determined. Results indicated that their content and distribution in different parts and cultivation years exhibit great variations...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28638675/petroleum-hydrocarbon-fingerprints-of-water-and-sediment-samples-of-buffalo-river-estuary-in-the-eastern-cape-province-south-africa
#4
A O Adeniji, O O Okoh, A I Okoh
Petroleum hydrocarbon status of the Buffalo River Estuary in East London, South Africa, was evaluated from January to May, 2016. Surface water and sediment samples were collected from five points in the estuary and extracted using standard methods. The extracts were subsequently analyzed by gas chromatography-flame ionization detection. Results showed that total petroleum hydrocarbon (TPH) varied from 7.65 to 477 μg/L in the water and 12.59 to 1,100 mg/kg in the sediments, with mean values of 146.50 ± 27...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28630784/elemental-characterization-of-romanian-crop-medicinal-plants-by-neutron-activation-analysis
#5
Daniela Haidu, Dénes Párkányi, Radu Ioan Moldovan, Cecilia Savii, Iulia Pinzaru, Cristina Dehelean, Ludovic Kurunczi
The metallic elements concentrations of medicinal plants (coriander, dill, Echinacea, lavender, chamomile, mint, and plantain, used for phytopharmaceutical products), cultivated in unpolluted region, were analyzed by neutron activation analysis. The essential nutrients, macro-, micro-, and trace elements (K, Ca, Mg, Na, Fe, Mn, Rb, Sr, and Zn), potentially toxic elements (Al, As, Ba, Co, Sb, Cr, and V), and rare earth elements were monitored and were compared with those presented in the literature. An estimation of their contributions to intake and toxicity for a person was made, which revealed that (a) teas prepared from the examined plants represent useful contribution to the food provided intake of three essential macronutrients (K, Ca, and Mg); (b) the Cu, Mn, Rb, Sr, Zn, and rare earths levels are normal or low; (c) the quantities of As, Ba, Co, Sb, Cr, and V do not represent toxicological concerns; (d) the examination of the estimated Al and Fe quantities recovered in infusions in the conditions of usual daily tea consumption is below the Tolerable Daily Intake values...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28630783/highly-sensitive-colorimetric-assay-for-determining-fe-3-based-on-gold-nanoparticles-conjugated-with-glycol-chitosan
#6
Kyungmin Kim, Yun-Sik Nam, Yeonhee Lee, Kang-Bong Lee
A highly sensitive and simple colorimetric assay for the detection of Fe(3+) ions was developed using gold nanoparticles (AuNPs) conjugated with glycol chitosan (GC). The Fe(3+) ion coordinates with the oxygen atoms of GC in a hexadentate manner (O-Fe(3+)-O), decreasing the interparticle distance and inducing aggregation. Time-of-flight secondary ion mass spectrometry showed that the bound Fe(3+) was coordinated to the oxygen atoms of the ethylene glycol in GC, which resulted in a significant color change from light red to dark midnight blue due to aggregation...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28546882/in-situ-synthesis-of-a-magnetic-graphene-platform-for-the-extraction-of-benzimidazoles-from-food-samples-and-analysis-by-high-performance-liquid-chromatography
#7
Qianchun Zhang, Yulan Liu, Xingyi Wang, Huimin Li, Junyu Chen
A novel method was proposed for the determination of five benzimidazoles (oxfendazole, mebendazole, flubendazole, albendazole, and fenbendazole) using magnetic graphene (G-Fe3O4). G-Fe3O4 was synthesized via in situ chemical coprecipitation. The properties of G-Fe3O4 were characterized by various instrumental methods. G-Fe3O4 exhibited a great adsorption ability and good stability towards analytes. Various experimental parameters that might affect the extraction efficiency such as the amount of G-Fe3O4, extraction solvent, extraction time, and desorption conditions were evaluated...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28512594/rapid-determination-of-six-low-molecular-carbonyl-compounds-in-tobacco-smoke-by-the-apci-ms-ms-coupled-to-data-mining
#8
Wuduo Zhao, Qidong Zhang, Binbin Lu, Shihao Sun, Shusheng Zhang, Jianxun Zhang
A simple method was established for the rapid determination of low molecular carbonyl compounds by the combination of atmospheric pressure chemical ionization tandem mass spectrometry (APCI-MS/MS) and data mining. The ionization was carried out in positive mode, and six low molecular carbonyl compounds of acrolein, acetone, propionaldehyde, crotonaldehyde, butanone, and butyraldehyde were analyzed by both full scan mode and daughter scan mode. To overcome the quantitative difficulties from isomer of acetone/propionaldehyde and butanone/butyraldehyde, the quantitation procedure was performed with the characteristic ion of [CH3O](+) under CID energy of 5 and 15 eV...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28512593/electrochemical-determination-of-caffeine-content-in-ethiopian-coffee-samples-using-lignin-modified-glassy-carbon-electrode
#9
Meareg Amare, Senait Aklog
Lignin film was deposited at the surface of glassy carbon electrode potentiostatically. In contrast to the unmodified glassy carbon electrode, an oxidative peak with an improved current and overpotential for caffeine at modified electrode showed catalytic activity of the modifier towards oxidation of caffeine. Linear dependence of peak current on caffeine concentration in the range 6 × 10(-6) to 100 × 10(-6) mol L(-1) with determination coefficient and method detection limit (LoD = 3 s/slope) of 0.99925 and 8...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28487814/qualitative-and-quantitative-characterization-of-monosaccharide-components-of-salvia-miltiorrhiza-liguspyragine-hydrochloride-and-glucose-injection
#10
Fa-Huan Ge, Xian-Peng Ma, Jin-Fang Ma, Chang-Qiong Bi, Tian-Ling Chen, Xiang-Dong Zhang, Xue Xiao
Salvia miltiorrhiza, liguspyragine hydrochloride, and glucose injection (SLGI) was made of Salvia miltiorrhiza Bge., liguspyragine hydrochloride, glucose, and glycerin. There were many kinds of monosaccharide components in SLGI, which might be from the raw material and Salvia miltiorrhiza Bge. Separation was performed on a Phenomenex Luna C18 analytical column (250 mm × 4.6 mm i.d., 5 μm, AccuStandard Inc., USA) at 30°C. The mobile phase consisted of two solvents: 0.1 mol/L phosphate-buffered saline (pH 6...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28473941/stable-isotope-ratio-and-elemental-profile-combined-with-support-vector-machine-for-provenance-discrimination-of-oolong-tea-wuyi-rock-tea
#11
Yun-Xiao Lou, Xian-Shu Fu, Xiao-Ping Yu, Zi-Hong Ye, Hai-Feng Cui, Ya-Fen Zhang
This paper focused on an effective method to discriminate the geographical origin of Wuyi-Rock tea by the stable isotope ratio (SIR) and metallic element profiling (MEP) combined with support vector machine (SVM) analysis. Wuyi-Rock tea (n = 99) collected from nine producing areas and non-Wuyi-Rock tea (n = 33) from eleven nonproducing areas were analysed for SIR and MEP by established methods. The SVM model based on coupled data produced the best prediction accuracy (0.9773). This prediction shows that instrumental methods combined with a classification model can provide an effective and stable tool for provenance discrimination...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28469950/spectrophotometric-method-for-the-determination-of-atmospheric-cr-pollution-as-a-factor-to-accelerated-corrosion
#12
Dereje Homa, Ermias Haile, Alemayehu P Washe
The effect of Cr(VI) pollution on the corrosion rate of corrugated iron roof samples collected from tanning industry areas was investigated through simulated laboratory exposure and spectrophotometric detection of Cr(III) deposit as a product of the reaction. The total level of Cr detected in the samples ranged from 113.892 ± 0.17 ppm to 53.05 ± 0.243 ppm and showed increasing trend as sampling sites get closer to the tannery and in the direction of tannery effluent stream. The laboratory exposure of a newly manufactured material to a simulated condition showed a relatively faster corrosion rate in the presence of Cr(VI) with concomitant deposition of Cr(III) under pH control...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28386512/study-of-chemical-intermediates-by-means-of-atr-ir-spectroscopy-and-hybrid-hard-and-soft-modelling-multivariate-curve-resolution-alternating-least-squares
#13
Junxiu Ma, Juan Qi, Xinyu Gao, Chunhua Yan, Tianlong Zhang, Hongsheng Tang, Hua Li
3,5-Diamino-1,2,4-triazole (DAT) became a significant energetic materials intermediate, and the study of its reaction mechanism has fundamental significance in chemistry. The aim of this study is to investigate the ability of online attenuated total reflection infrared (ATR-IR) spectroscopy combined with the novel approach of hybrid hard- and soft-modelling multivariate curve resolution-alternating least squares (HS-MCR) analysis to monitor and detect changes in structural properties of compound during 3,5-diamino-1,2,4-triazole (DAT) synthesis processes...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28357152/a-highly-sensitive-multicommuted-flow-analysis-procedure-for-photometric-determination-of-molybdenum-in-plant-materials-without-a-solvent-extraction-step
#14
Felisberto G Santos, Boaventura F Reis
A highly sensitive analytical procedure for photometric determination of molybdenum in plant materials was developed and validated. This procedure is based on the reaction of Mo(V) with thiocyanate ions (SCN(-)) in acidic medium to form a compound that can be monitored at 474 nm and was implemented employing a multicommuted flow analysis setup. Photometric detection was performed using an LED-based photometer coupled to a flow cell with a long optical path length (200 mm) to achieve high sensitivity, allowing Mo(V) determination at a level of μg L(-1) without the use of an organic solvent extraction step...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28348920/a-new-kinetic-spectrophotometric-method-for-the-quantitation-of-amorolfine
#15
César Soto, Cristian Poza, David Contreras, Jorge Yáñez, Fallon Nacaratte, M Inés Toral
Amorolfine (AOF) is a compound with fungicide activity based on the dual inhibition of growth of the fungal cell membrane, the biosynthesis and accumulation of sterols, and the reduction of ergosterol. In this work a sensitive kinetic and spectrophotometric method for the AOF quantitation based on the AOF oxidation by means of KMnO4 at 30 min (fixed time), pH alkaline, and ionic strength controlled was developed. Measurements of changes in absorbance at 610 nm were used as criterion of the oxidation progress...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28348919/optimized-multiresidue-analysis-of-organic-contaminants-of-priority-concern-in-a-daily-consumed-fish-grass-carp
#16
Wei He, Yanru Chen, Chen Yang, Wenxiu Liu, Xiangzhen Kong, Ning Qin, Qishuang He, Fuliu Xu
The organic contaminants, including polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs), and polychlorinated biphenyls (PCBs), are of priority concern because of their persistence, toxicity, and long-distance transportation in global environment. Their residues in a daily consumed fish (grass carp) pose potential threat to human health and aquatic ecosystems. The present study optimized an analytical protocol of microwave-assisted extraction (MAE), lip-removal by gel permeation chromatography (GPC), cleanup by solid phase cartridge (SC) or adsorption chromatography column (CC), and gas chromatography-mass spectrometry (GC/MS)...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28326222/acupuncture-injection-combined-with-electrokinetic-injection-for-polydimethylsiloxane-microfluidic-devices
#17
Ji Won Ha
We recently reported acupuncture sample injection that leads to reproducible injection of nL-scale sample segments into a polydimethylsiloxane (PDMS) microchannel for microchip capillary electrophoresis. The advantages of the acupuncture injection in microchip capillary electrophoresis include capability of minimizing sample loss and voltage control hardware and capability of introducing sample plugs into any desired position of a microchannel. However, the challenge in the previous study was to achieve reproducible, pL-scale sample injections into PDMS microchannels...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28255502/stability-study-of-algerian-nigella-sativa-seeds-stored-under-different-conditions
#18
Muhammad Safwan Ahamad Bustamam, Kamarul Arifin Hadithon, Ahmed Mediani, Faridah Abas, Yaya Rukayadi, Nordin Lajis, Khozirah Shaari, Intan Safinar Ismail
In a study to determine the stability of the main volatile constituents of Nigella sativa seeds stored under several conditions, eight storage conditions were established, based on the ecological abiotic effects of air, heat, and light. Six replicates each were prepared and analyzed with Headspace-Gas Chromatography-Mass Spectrometry (HS-GC-MS) for three time points at the initial (1st day (0)), 14th (1), and 28th (2) day of storage. A targeted multivariate analysis of Principal Component Analysis revealed that the stability of the main volatile constituents of the whole seeds was better than that of the ground seeds...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28255501/chemical-composition-physicochemical-characteristics-and-nutritional-value-of-lannea-kerstingii-seeds-and-seed-oil
#19
Judicaël Thomas Ouilly, Patrice Bazongo, Adjima Bougma, Nèbpawindé Kaboré, Anne Mette Lykke, Amadé Ouédraogo, Imaël Henri Nestor Bassolé
The chemical composition, main physicochemical properties, and nutritional value of seed flour and seed oil of Lannea kerstingii were studied. The results indicated that seeds contained 3.61% moisture, 57.85% fat, 26.39% protein, 10.07% carbohydrates, and 2.08% ash. Potassium was the predominant mineral, followed by magnesium and calcium. The essential amino acids were at higher levels than the estimated amino acid requirements of FAO/WHO/UNU except for lysine. Fatty acid composition showed that oleic acid was the major fatty acid, followed by palmitic, linoleic, and stearic acids...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28255500/pencil-graphite-electrodes-a-versatile-tool-in-electroanalysis
#20
REVIEW
Iulia Gabriela David, Dana-Elena Popa, Mihaela Buleandra
Due to their electrochemical and economical characteristics, pencil graphite electrodes (PGEs) gained in recent years a large applicability to the analysis of various types of inorganic and organic compounds from very different matrices. The electrode material of this type of working electrodes is constituted by the well-known and easy commercially available graphite pencil leads. Thus, PGEs are cheap and user-friendly and can be employed as disposable electrodes avoiding the time-consuming step of solid electrodes surface cleaning between measurements...
2017: Journal of Analytical Methods in Chemistry
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