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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/28819581/electrochemical-evaluation-of-trans-resveratrol-levels-in-red-wine-based-on-the-interaction-between-resveratrol-and-graphene
#1
Lantao Liu, Yanli Zhou, Yiyu Kang, Haihong Huang, Congming Li, Maotian Xu, Baoxian Ye
trans-Resveratrol is often considered as one of the quality standards of red wine, and the development of a sensitive and reliable method for monitoring the trans-resveratrol levels in red wine is an urgent requirement for the quality control. Here, a novel voltammetric approach was described for probing trans-resveratrol using a graphene-modified glassy carbon (GC) electrode. The proposed electrode was prepared by one-step electrodeposition of reduced graphene oxide (ERGO) at a GC electrode. Compared with the bare GC electrode, the introduced graphene film on the electrode surface dramatically improved the sensitivity of the sensor response due to the π-π interaction between the graphene and trans-resveratrol...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28819580/analytical-method-for-the-validation-of-three-polyphenols-as-a-marker-compound-for-the-standardization-of-solidago-virgaurea-subsp-gigantea-extracts-and-antiadipogenesis-of-harvesting-time-and-location
#2
Seung Hwan Hwang, Ju Hee Kim, Zhiqiang Wang, Jae-Yong Lee, Soon Sung Lim
Protocatechuic acid (PC), chlorogenic acid (CA), and kaempferol-3-O-rutinoside (K-O-R), isolated from the Solidago virgaurea subsp. gigantea (SV) extract, were quickly and efficiently separated using HPLC. Our chromatographic method was found to effectively separate PC, CA, and K-O-R at retention times of 5.36, 8.22, and 17.04 min, respectively. Linearity of PC, CA, and K-O-R was found to be in the range of 4.85-485.00, 47.5-1900.00, and 8.50-850.00 μg/ml. Recoveries ranged between 101.32 and 103.30%, 95...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28811956/spectrophotometric-methods-for-simultaneous-determination-of-oxytetracycline-hcl-and-flunixin-meglumine-in-their-veterinary-pharmaceutical-formulation
#3
Hanan A Merey, Mahmmoud S Abd-Elmonem, Hagar N Nazlawy, Hala E Zaazaa
Four precise, accurate, selective, and sensitive UV-spectrophotometric methods were developed and validated for the simultaneous determination of a binary mixture of Oxytetracycline HCl (OXY) and Flunixin Meglumine (FLU). The first method, dual wavelength (DW), depends on measuring the difference in absorbance (ΔA 273.4-327 nm) for the determination of OXY where FLU is zero while FLU is determined at ΔA 251.7-275.7 nm. The second method, first-derivative spectrophotometric method (1D), depends on measuring the peak amplitude of the first derivative selectively at 377 and 266...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28808600/simultaneous-determination-of-11-compounds-in-gualou-guizhi-granule-and-pharmacokinetics-study-by-uplc-ms-ms
#4
Chengtao Sun, Wen Xu, Yuqin Zhang, Lishuang Yu, Miao Ye, Kedan Chu, Wei Xu, Yu Lin
A rapid and sensitive ultrafast performance liquid chromatography-tandem mass spectrometry method (UPLC-MS/MS) was developed for the simultaneous determination of 11 compounds in Gualou Guizhi Granule (GLGZG), including liquiritin, isoliquiritin, liquirtin apioside, isoliquiritin apioside, liquiritigenin, isoliquiritigenin, glycyrrhizic acid, glycyrrhetinic acid, paeoniflorin, albiflorin, and paeoniflorin sulfonate in rat plasma. UPLC-MS/MS assay with negative ion mode was performed on a Waters CORTECS C18 (2...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28808599/solidified-floating-organic-drop-microextraction-for-the-detection-of-trace-amount-of-lead-in-various-samples-by-electrothermal-atomic-absorption-spectrometry
#5
Oya Aydın Urucu, Şeyda Dönmez, Ece Kök Yetimoğlu
A novel method was developed for determination of trace amounts of lead in water and food samples. Solidified floating organic drop microextraction was used to preconcentrate the lead ion. After the analyte was complexed with 1-(2-pyridylazo)-2-naphthol, undecanol and acetonitrile were added as extraction and dispersive solvent, respectively. Variables such as pH, volumes of extraction and dispersive solvents, and concentration of chelating agent were optimized. Under the optimum conditions, the detection limit of Pb (II) was determined as 0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28808598/synthesis-characterization-and-adsorptive-properties-of-fe3o4-go-nanocomposites-for-antimony-removal
#6
Xiuzhen Yang, Tengzhi Zhou, Bozhi Ren, Zhou Shi, Andrew Hursthouse
A magnetic Fe3O4/GO composite with potential for rapid solid-liquid separation through a magnetic field was synthesized using GO (graphene oxide) and Fe3O4 (ferriferous oxide). Characterization of Fe3O4/GO used scanning electron microscope (SEM), X-ray diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR), and Vibrating Sample Magnetometer (VSM). A number of factors such as pH and coexisting ions on adsorbent dose were tested in a series of batch experiments. The results showed that GO and Fe3O4 are strongly integrated...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28804670/synthesis-and-characterization-of-mixed-iron-manganese-oxide-nanoparticles-and-their-application-for-efficient-nickel-ion-removal-from-aqueous-samples
#7
Alessandro Buccolieri, Antonio Serra, Giuseppe Maruccio, Anna Grazia Monteduro, Sanosh Kunjalukkal Padmanabhan, Antonio Licciulli, Valentina Bonfrate, Luca Salvatore, Daniela Manno, Lucio Calcagnile, Gabriele Giancane
Mixed iron-manganese oxide nanoparticles, synthesized by a simple procedure, were used to remove nickel ion from aqueous solutions. Nanostructures, prepared by using different weight percents of manganese, were characterized by transmission electron microscopy, selected area diffraction, X-ray diffraction, Raman spectroscopy, and vibrating sample magnetometry. Adsorption/desorption isotherm curves demonstrated that manganese inclusions enhance the specific surface area three times and the pores volume ten times...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28804669/research-on-the-characteristics-and-mechanism-of-the-cumulative-release-of-antimony-from-an-antimony-smelting-slag-stacking-area-under-rainfall-leaching
#8
Bozhi Ren, Yingying Zhou, Andrew S Hursthouse, Renjian Deng
We aimed to study the characteristics and the mechanism of the cumulative release of antimony at an antimony smelting slag stacking area in southern China. A series of dynamic and static leaching experiments to simulate the effects of rainfall were carried out. The results showed that the release of antimony from smelting slag increased with a decrease in the solid-liquid ratio, and the maximum accumulated release was found to be 42.13 mg Sb/kg waste and 34.26 mg Sb/kg waste with a solid/liquid ratio of 1 : 20; the maximum amount of antimony was released within 149-420 μm size fraction with 7...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28798884/spe-tlc-densitometric-quantification-of-selected-synthetic-food-dyes-in-liquid-foodstuffs-and-pharmaceutical-preparations
#9
Anna W Sobańska, Jarosław Pyzowski, Elżbieta Brzezińska
Selected synthetic food dyes (tartrazine, Ponceau 4R, Brilliant Blue, orange yellow, and azorubine) were isolated from liquid preparations (mouthwashes and beverages) by Solid Phase Extraction on aminopropyl-bonded silica with diluted aqueous sodium hydroxide as an eluent. The extraction step was followed by thin layer chromatography on silica gel 60 with chloroform-isopropanol-25% aq. ammonia 1 : 3 : 1 (v/v/v) as mobile phase and the densitometric quantification of dyes was achieved using quadratic calibration plots (R(2) > 0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28798883/magnetic-solid-phase-extraction-using-fe3o4-sio2-magnetic-nanoparticles-followed-by-uv-vis-spectrometry-for-determination-of-paraquat-in-plasma-and-urine-samples
#10
Ou Sha, Yu Wang, Xin Yin, Xiaobing Chen, Li Chen, Shujun Wang
A rapid and simple method was optimized and validated for the separation and quantification of paraquat, a frequently used herbicide and a leading cause of fatal poisoning worldwide, at trace levels with UV-Vis spectrophotometry in plasma and urine samples by direct magnetic solid-phase extraction. Fe3O4@SiO2 nanoparticles (NPs) were used as the magnetic solid-phase extraction agents and the paraquat absorbed on NPs was eluted using NaOH and ascorbic acid. Upon optimization, paraquat could be extracted and concentrated from various samples by 35-fold...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28785509/metabolite-profiling-pharmacokinetics-and-in-vitro-glucuronidation-of-icaritin-in-rats-by-ultra-performance-liquid-chromatography-coupled-with-mass-spectrometry
#11
Beibei Zhang, Xiaoli Chen, Rui Zhang, Fangfang Zheng, Shuzhang Du, Xiaojian Zhang
Icaritin is a naturally bioactive flavonoid with several significant effects. This study aimed to clarify the metabolite profiling, pharmacokinetics, and glucuronidation of icaritin in rats. An ultra-performance liquid chromatography coupled with mass spectrometry (UPLC-MS) assay was developed and validated for qualitative and quantitative analysis of icaritin. Glucuronidation rates were determined by incubating icaritin with uridine diphosphate glucuronic acid- (UDPGA-) supplemented microsomes. Kinetic parameters were derived by appropriate model fitting...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28781908/simultaneous-analysis-of-ursolic-acid-and-oleanolic-acid-in-guava-leaves-using-quechers-based-extraction-followed-by-high-performance-liquid-chromatography
#12
Chang Xu, Yiyi Liao, Chunyan Fang, Makoto Tsunoda, Yingxia Zhang, Yanting Song, Shiming Deng
In this paper, a novel method of QuEChERS-based extraction coupled with high-performance liquid chromatography has been developed for the simultaneous determination of ursolic acid (UA) and oleanolic acid (OA) in guava leaves. The QuEChERS-based extraction parameters, including the amount of added salt, vortex-assisted extraction time, and absorbent amount, and the chromatographic conditions were investigated for the analysis of UA and OA in guava leaves. Under the optimized conditions, the method showed good linearity over a range of 1-320 μg mL(-1), with correlation coefficients above 0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28781907/development-and-validation-of-a-stability-indicating-hplc-method-for-the-simultaneous-determination-of-florfenicol-and-flunixin-meglumine-combination-in-an-injectable-solution
#13
Nidal Batrawi, Hani Naseef, Fuad Al-Rimawi
The combination of the powerful antimicrobial agent florfenicol and the nonsteroidal anti-inflammatory flunixin meglumine is used for the treatment of bovine respiratory disease (BRD) and control of BRD-associated pyrexia, in beef and nonlactating dairy cattle. This study describes the development and validation of an HPLC-UV method for the simultaneous determination of florfenicol and flunixin, in an injectable preparation with a mixture of excipients. The proposed RP-HPLC method was developed by a reversed phase- (RP-) C18e (250 mm × 4...
2017: Journal of Analytical Methods in Chemistry
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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