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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/28932619/extraction-of-phosphate-from-polluted-waters-using-calcium-alginate-beads-doped-with-active-carbon-derived-from-a-aspera-plant-as-adsorbent
#1
Ravulapalli Sujitha, Kunta Ravindhranath
An adsorbent prepared by entrapping active carbon derived from the stems of Achyranthes aspera plant in the calcium alginate beads (CABAA) has been investigated for its adsorption nature towards the removal of phosphate by varying various physicochemical parameters. Surface morphological studies are made using FTIR, XRD, FESEM, and EDX. The sorption mechanism is analyzed using Freundlich, Langmuir, Dubinin-Radushkevich, and Temkin adsorption isotherms. The adsorption kinetics is found to follow the pseudo-second-order model...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28932618/a-simple-fast-and-inexpensive-simultaneous-determination-of-trace-bismuth-iii-and-lead-ii-in-water-samples-by-adsorptive-stripping-voltammetry
#2
Malgorzata Grabarczyk, Marzena Adamczyk
A simple, fast, and inexpensive voltammetric method for the simultaneous determination of trace bismuth(III) and lead(II) using (Hg(Ag)FE) as a working electrode was optimized. For adsorptive stripping voltammetric determination of Bi(III) and Pb(II) in a single scan, the cupferron was applied as a complexing agent. Experimental conditions under which these elements can be simultaneously detected include 0.1 mol L(-1) acetate buffer (pH = 4.6), 1 × 10(-4) mol L(-1) cupferron, accumulation potential -0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28913006/uhplc-pda-assay-for-simultaneous-determination-of-vitamin-d3-and-menaquinone-7-in-pharmaceutical-solid-dosage-formulation
#3
Muhammad Jehangir, Mahmood Ahmed, Muhammad Imtiaz Shafiq, Abdul Samad, Iftikhar-Ul-Haq
A newly developed method based on ultrahigh performance liquid chromatography (UHPLC) was optimized for the simultaneous determination of vitamin D3 and menaquinone-7 (MK-7) in tablet formulation in the present study. UHPLC separation of vitamin D3 and MK-7 was performed with ACE Excel 2 C18-PFP column (2 μm, 2.1 × 100 mm) at 0.6 mL min(-1) flow rate, whereas the mobile phase consisted of methanol/water (19 : 1, v/v, phase A) and isopropyl alcohol (99.9%, phase B) containing 0.5% triethylamine. Isocratic separation of both the analytes was performed at 40°C by pumping the mobile phases A and B in the ratio of 50 : 50 (v/v, pH, 6...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28894622/a-liquid-chromatography-tandem-mass-spectrometry-method-for-evaluation-of-two-brands-of-enalapril-20%C3%A2-mg-tablets-in-healthy-human-volunteers
#4
Wael Abu Dayyih, Mohammed Hamad, Ahmad Abu Awwad, Eyad Mallah, Zainab Zakarya, Alice Abu Dayyih, Tawfiq Arafat
Enalapril is an angiotensin-converting enzyme inhibitor used for treatment of hypertension and chronic heart disease. Enalaprilat is its active metabolite responsible for the activity. This study aimed to develop and validate a method for enalapril and enalaprilat analysis and to determine the bioequivalence of two tablet formulae of enalapril. LC-MS/MS bioanalytical method was developed and validated and then applied to evaluate the bioavailability of two enalapril formulae. Antihyperglycemic sitagliptin was used as internal standard (IS)...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28894621/stereospecific-assay-of-r-and-s-goitrin-in-commercial-formulation-of-radix-isatidis-by-reversed-phase-high-performance-liquid-chromatography
#5
Lixing Nie, Zhong Dai, Shuangcheng Ma
Radix isatidis (Banlangen) is a widely used traditional Chinese medicine for treating fever and removing toxic heat. Pharmacological studies have indicated that (R)-goitrin (epigoitrin) is one of the main constituents accounting for its antiviral activity, while (S)-goitrin (goitrin) is known as an antithyroid factor. To better control the quality of radix isatidis and its formulations, it is imperative to enantiomerically determine the contents of R- and S-goitrin. In this study, an enantioselective method based on reversed phase chromatography was developed for the assay of (R, S)-goitrin enantiomers...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28848686/chromatographic-characterization-and-method-development-for-determination-of-levetiracetam-in-saliva-application-to-correlation-with-plasma-levels
#6
Imad I Hamdan, Mervat Alsous, Amira Taher Masri
Levetiracetam (LVT) is a widely used antiepileptic drug (AED). A less invasive sampling method for therapeutic drug monitoring (TDM) would be very useful particularly for children. Saliva has been shown as an adequate sample for TDM of some AEDs. Due to the high hydrophilicity of LVT its separation on common stationary phases is quite a challenge so that previous methods for determination of LVT in saliva employed either gradient high performance liquid chromatographic (HPLC) system or mass spectrometer as a detector...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28831327/extraction-of-illegal-dyes-from-red-chili-peppers-with-cholinium-based-deep-eutectic-solvents
#7
Shuqiang Zhu, Dongling Liu, Xinyue Zhu, Along Su, Haixia Zhang
Deep eutectic solvents (DESs) as a new kind of green solvents have been used to extract bioactive compounds but there are few applications in extracting chrysoidine dyes. In this study, we developed an ultrasonic-assisted extraction method with choline chloride/hydrogen bond donor (ChCl/HBD) DES for the extraction of chrysoidine G (COG), astrazon orange G (AOG), and astrazon orange R (AOR) in food samples. Some experimental parameters, such as extraction time, raw material/solvent ratio, and temperature, were evaluated and optimized as follows: the ratio of ChCl/HBD, 1 : 2 (v/v); the ratio of sample/DES, 1 : 10 (g/mL); extraction time, 20 min; extraction temperature, 50°C...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28819581/electrochemical-evaluation-of-trans-resveratrol-levels-in-red-wine-based-on-the-interaction-between-resveratrol-and-graphene
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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