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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/30538885/speciation-analysis-of-arsenic-compounds-by-hplc-icp-ms-application-for-human-serum-and-urine
#1
Manh Ha Nguyen, Tien Duc Pham, Thi Lien Nguyen, Hai Anh Vu, Thi Thao Ta, Minh Binh Tu, Thi Hong Yen Nguyen, Dinh Binh Chu
A high-performance liquid chromatography (HPLC) in combination with inductively coupled plasma mass spectrometry (ICP-MS) as an elemental specific detector was used for the speciation analysis of arsenic compounds in urine and serum samples from Vietnam. Five arsenic species including arsenite (AsIII ), arsenate (AsV ), monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), and arsenobetaine (AsB) were studied. A gradient elution of ammonium carbonate ((NH4 )2 CO3 ), ethylenediaminetetraacetic acid disodium salt (Na2 EDTA), and methanol at pH 9...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30533245/isolation-of-aflatoxin-b1-from-moldy-foods-by-solid-phase-extraction-combined-with-bifunctional-ionic-liquid-based-silicas
#2
Luwei Fang, Minglei Tian, Xuemin Yan, Wei Xiao
A solid-phase extraction method was developed by using new bifunctional ionic liquid-based silicas as sorbents to isolate aflatoxin B1 from moldy corn and peanut. Firstly, according to the adsorption efficiency, two sorbents imidazolium chloride-butylimidazolium chloride-based silica (Sil@BIm-Im) and imidazolium chloride-hexylimidazolium chloride-based silica (Sil@HIm-Im) were selected. The RSM was introduced to optimize adsorption conditions such as methanol/water ratio, time, and pH. Sil@HIm-Im, which had the highest adsorption efficiency, was used in SPE as a sorbent...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30515344/simultaneous-quantification-of-six-bioactive-components-in-decoction-of-ziziphi-spinosae-semen-using-ultrahigh-performance-liquid-chromatography-coupled-with-triple-quadrupole-mass-spectrometry
#3
Xiao Liu, Xiaochai Zhu, Hui Zhu, Li Xie, Jia Ma, Yinghui Xu, Qigang Zhou, Zejun Wu, Baochang Cai
This paper was conducted to develop a method containing ultrahigh performance liquid chromatography coupled with triple-quadrupole tandem mass spectrometry for simultaneous quantification of six bioactive components in the decoction of Ziziphi spinosae Semen. Analysis was performed on an Agilent ZORBAX Extend-C18 column (2.1 × 100 mm, 1.8  μ m) and eluted with a mobile phase system consisting of acetonitrile and water under a gradient program with a flow rate of 0.3 ml/min. The injection volume was 2  μ l...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30515343/development-of-cellulosic-paper-based-test-strips-for-mercury-ii-determination-in-aqueous-solution
#4
Shoujuan Wang, Zhen Xu, Yongyi Fang, Zhongming Liu, Xin Zhao, Guihua Yang, Fangong Kong
Titration method (dropping-on method) was introduced as an efficient approach for determining the mercury ion (Hg2+ ) concentration in aqueous solution by using fabricated cellulosic paper-based test strips. In this study, dithizone used as a recognition reagent was physically loaded on cellulosic paper-based test strips for Hg2+ selective recognition. The sensing mechanism was established on the spectral absorption rate of the coordination compound that was formed by dithizone and Hg2+ under strong acidic conditions...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30420937/combination-of-microwave-assisted-girard-derivatization-with-ionic-liquid-matrix-for-sensitive-maldi-tof-ms-analysis-of-human-serum-n-glycans
#5
Hoa Thi Le, Kyu H Park, Woong Jung, Hyung Soon Park, Tae Woo Kim
We developed a new method for MALDI-TOF MS detection of N-glycans derived from human serum. The synergistic combination of microwave-assisted Girard T derivatization, solid-phase extraction desalting, and an ionic liquid matrix (2, 5-dihydroxybenzoic acid/aniline) (GT-SPE-DHB/An) allowed of more sensitive N-glycans detection than a conventional ionic liquid matrix in MALDI-TOF MS. The superior sensitivity of our method was confirmed by the number of assigned N-glycans in 900-2,000 m/z range. Using our GT-SPE-DHB/An method, we were successfully able to assign 31 glycans...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30420936/quantitative-analysis-and-band-gap-determination-for-cigs-absorber-layers-using-surface-techniques
#6
Yun Jung Jang, Jihye Lee, Kang-Bong Lee, Donghwan Kim, Yeonhee Lee
Recently, Cu(In X Ga(1- X ) )Se2 (CIGS) absorber layers have been extensively studied by many research groups for thin-film solar cell technology. CIGS material is particularly promising due to its exceptionally high absorption coefficient and large band gap range, which is adjustable as a function of alloy stoichiometry. To enhance the conversion performance of CIGS solar cells, understanding the CIGS structure and composition is a crucial challenge. We conducted a quantitative study to determine the bulk composition of the major elements such as Cu, In, Ga, and Se of four different CIGS photovoltaic cells...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30420935/dna-nanotweezers-with-hydrolytic-activity-for-enzyme-free-and-sensitive-detection-of-fusion-gene-via-logic-operation
#7
Yongjie Xu, Xiangrong Luo, Nana Geng, Mingsong Wu, Zhishun Lu
Gene fusion is a molecular event occurring in cellular proliferation and differentiation, and the occurrence of irregular fusion gene results in various malignant diseases. So, sensing fusion gene with high performance is an important task for integrating individual disease information. Here, we proposed a nonenzymatic and high-throughput fluorescent assay system for the detection of fusion gene by employing DNA nanotweezers with hydrolytic activity. This tweezer was assembled by three single-stranded DNAs and engineered with sensing elements and reporting subunits...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30405933/pharmacokinetics-and-uplc-ms-ms-of-delsoline-in-mouse-whole-blood
#8
Lingjiu Shao, Yue Jin, Huiyan Fu, Jianshe Ma, Xianqin Wang, Yongxi Jin, Congcong Wen
Delsoline, a major alkaloid of Delphinium anthriscifolium Hance, has both a curare-like effect and a ganglion-blocking effect and is used to relieve muscle tension or hyperkinesia. A ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was established for the determination of delsoline in mouse blood, and the pharmacokinetics of delsoline after intravenous administration (1 mg/kg) and intragastric administration (9, 6, and 3 mg/kg) were studied. Gelsenicine served as an internal standard, and a UPLC BEH C18 chromatographic column was used...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30402327/determination-of-fluoroquinolones-in-pharmaceutical-formulations-by-extractive-spectrophotometric-methods-using-ion-pair-complex-formation-with-bromothymol-blue
#9
Trung Dung Nguyen, Hoc Bau Le, Thi Oanh Dong, Tien Duc Pham
In this paper, we reported a new, simple, accurate, and precise extractive spectrophotometric method for the determination of fluoroquinolones (FQs) including ciprofloxacin (CFX), levofloxacin (LFX), and ofloxacin (OFX) in pharmaceutical formulations. The proposed method is based on the ion-pair formation complexes between FQs and an anionic dye, bromothymol blue (BTB), in acidic medium. The yellow-colored complexes which were extracted into chloroform were measured at the wavelengths of 420, 415, and 418 nm for CFX, LFX, and OFX, respectively...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30402326/improvement-in-analytical-methods-for-determination-of-sugars-in-fermented-alcoholic-beverages
#10
Ayalew Debebe, Shibru Temesgen, Mesfin Redi-Abshiro, Bhagwan Singh Chandravanshi, Estifanos Ele
The main objective of this study was to improve the performance of analytical methods for the determination of sugars in fermented alcoholic beverages based on mid-infrared-partial least squares (MIR-PLS), high-performance liquid chromatography with the ultraviolet detector (HPLC-UV), high-performance liquid chromatography with the refractive index detector (HPLC-RI), and sulfuric acid methods. The MIR-PLS method was found to give good prediction of individual sugars: glucose, fructose, sucrose, and maltose in the alcoholic beverages with less than 4% error...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30402325/advances-in-ms-based-analytical-methods-innovations-and-future-trends
#11
EDITORIAL
Federica Bianchi, Leopold Ilag, Veronica Termopoli, Lucia Mendez
No abstract text is available yet for this article.
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30364070/headspace-solid-phase-microextraction-coupled-to-comprehensive-two-dimensional-gas-chromatography-time-of-flight-mass-spectrometry-for-the-determination-of-short-chain-chlorinated-paraffins-in-water-samples
#12
Nan Zhan, Feng Guo, Shuai Zhu, Zhu Rao
Short-chain chlorinated paraffins (SCCPs) are a new type of persistent organic pollutants. In this work, a simple and effective method involving headspace solid-phase microextraction (HS-SPME) and comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC-TOF-MS) was developed and optimized for the determination of trace SCCPs in water samples. The key parameters related to extraction and separation efficiency were systematically optimized. The SCCP congener groups were best resolved using an Rxi-5Sil MS (30 m × 0...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30363936/preparation-of-imazethapyr-surface-molecularly-imprinted-polymers-for-its-selective-recognition-of-imazethapyr-in-soil-samples
#13
Yanqiang Zhou, Yinhui Yang, Meihua Ma, Zhian Sun, Shanshan Wu, Bolin Gong
A novel strategy based on imazethapyr (IM) molecular-imprinting polymers (MIPs) grafted onto the surface of chloromethylation polystyrene resin via surface-initiated atom transfer radical polymerization (SI-ATRP) for specific recognition and sensitive determination of trace imazethapyr in soil samples was developed. The SI-ATRP was performed by using methanol-water (4 : 1, v/v) as the solvent, acrylamide as the functional monomer, trimethylolpropane trimethacrylate (TRIM) as the cross-linker, imazethapyr as the template, and CuBr/2,2'-bipyridine as the catalyst...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30363692/detection-of-polycyclic-aromatic-hydrocarbons-in-water-samples-by-annular-platform-supported-ionic-liquid-based-headspace-liquid-phase-microextraction
#14
Xiaojie Sun, Jie Tan, Haiyan Ding, Xiaojie Tan, Jun Xing, Lihong Xing, Yuxiu Zhai, Zhaoxin Li
In this paper, a new method of annular platform-supported headspace liquid-phase microextraction (LPME) was designed using ionic liquid as an extraction solvent, wherein extraction stability and efficiency were improved by adding an annular platform inside the extraction bottle. The ionic liquid 1-silicyl-3-benzylimidazolehexafluorophosphate was first synthesized and proved to be an excellent extraction solvent. Coupled with liquid chromatography, the proposed method was employed to analysis of polycyclic aromatic hydrocarbons (PAHs) in water and optimized in aspects of extraction temperature, extraction solvent volume, extraction time, pH, stirring rate, and salt effect of solution...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30345140/development-and-validation-of-an-hplc-method-for-determination-of-antidiabetic-drug-alogliptin-benzoate-in-bulk-and-tablets
#15
Hani Naseef, Ramzi Moqadi, Moammal Qurt
Alogliptin benzoate, a member of dipeptidyl peptidase-4 inhibitors, is a recent drug developed by Takeda Pharmaceutical Company for the treatment of Type 2 diabetes; it potentiates the effect of incretin hormones through the inhibition of their degradation. Alogliptin can be used alone or in combination therapy. A new sensitive and rapid HPLC method was developed for the determination of alogliptin benzoate in bulk and pharmaceutical dosage forms; it was validated according to ICH and FDA guidelines. The HPLC analysis was performed on the Agilent 1200 system equipped with a Hypersil Gold Thermo Scientific C18 (250 cm × 4...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30302300/determination-of-phosphorus-in-soil-by-icp-oes-using-an-improved-standard-addition-method
#16
Jing Yang, Jingwen Bai, Meiyu Liu, Yang Chen, Shoutong Wang, Qiyong Yang
In this study, an improved standard addition method (ISAM) was developed for the determination of phosphorus in soil by ICP-OES based on the conventional standard addition method (CSAM) and calibration curve method (CCM). Certified standard soils were analyzed by the proposed ISAM method. The values obtained by ISAM method agreed with the certified values. Additionally, the results obtained by ISAM method were compared with those determined by the other two methods (CSAM and CCM). All the values obtained by the ISAM agreed with those from the other two methods...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30275997/new-rp-hplc-method-development-and-validation-for-dorzolamide-in-ophthalmic-dosage-form
#17
Boovizhikannan Thangabalan, Getu Kahsay, Tadele Eticha
A reversed phase liquid chromatographic method with UV detection at 254 nm for dorzolamide assay in ophthalmic solutions was developed and validated. Chromatographic separation was achieved on a Zorbax SB C18 (250 mm × 4.6 mm, 5  µ m) column kept at 30°C with an isocratic mixture of mobile phase (phosphate buffer, pH 2.5, and acetonitrile, 90 : 10 v/v) at a flow rate of 0.8 mL/min. The method was validated for its specificity, linearity, accuracy, precision, limit of detection, limit of quantification, and robustness based on ICH guidelines...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30271653/erratum-to-comparison-between-different-extraction-methods-for-determination-of-primary-aromatic-amines-in-food-simulant
#18
Morteza Shahrestani, Mohammad Saber Tehrani, Shahram Shoeibi, Parviz Aberoomand Azar, Syed Waqif Husain
[This corrects the article DOI: 10.1155/2018/1651629.].
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30254785/optimization-of-vacuum-microwave-mediated-extraction-of-syringoside-and-oleuropein-from-twigs-of-syringa-oblata
#19
Xiangping Liu, Xuemin Jing, Guoliang Li
A vacuum microwave-mediated method was used to extract syringoside and oleuropein from Syringa oblata twigs. The optimal extraction conditions were an ethanol volume fraction of 40%, a liquid-solid ratio of 17 mL/g, 1 h of soaking time, -0.08 MPa of vacuum, a microwave irradiation power of 524 W, and a microwave irradiation time of 8 min. Under optimal parameters, the maximum yields of syringoside (5.92 ± 0.24 mg/g) and oleuropein (4.02 ± 0.18 mg/g) were obtained. The proposed method is more efficient than conventional methods for extracting syringoside and oleuropein from Syringa oblata ...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/30245903/collaborative-penalized-least-squares-for-background-correction-of-multiple-raman-spectra
#20
Long Chen, Yingwen Wu, Tianjun Li, Zhuo Chen
Although Raman spectroscopy has been widely used as a noninvasive analytical tool in various applications, backgrounds in Raman spectra impair its performance in quantitative analysis. Many algorithms have been proposed to separately correct the background spectrum by spectrum. However, in real applications, there are commonly multiple spectra collected from the close locations of a sample or from the same analyte with different concentrations. These spectra are strongly correlated and provide valuable information for more robust background correction...
2018: Journal of Analytical Methods in Chemistry
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