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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/29225994/red-wine-age-estimation-by-the-alteration-of-its-color-parameters-fourier-transform-infrared-spectroscopy-as-a-tool-to-monitor-wine-maturation-time
#1
M Basalekou, C Pappas, Y Kotseridis, P A Tarantilis, E Kontaxakis, S Kallithraka
Color, phenolic content, and chemical age values of red wines made from Cretan grape varieties (Kotsifali, Mandilari) were evaluated over nine months of maturation in different containers for two vintages. The wines differed greatly on their anthocyanin profiles. Mid-IR spectra were also recorded with the use of a Fourier Transform Infrared Spectrophotometer in ZnSe disk mode. Analysis of Variance was used to explore the parameter's dependency on time. Determination models were developed for the chemical age indexes using Partial Least Squares (PLS) (TQ Analyst software) considering the spectral region 1830-1500 cm-1...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29225993/determination-of-selected-metals-in-fruit-wines-by-spectroscopic-techniques
#2
Justyna Płotka-Wasylka, Małgorzata Rutkowska, Bartłomiej Cieślik, Alan Tyburcy, Jacek Namieśnik
Background: The determination of metals in different types of food and beverages samples has drawn significant attention due to several reasons with the most important one being the nutritional and toxic effects of these elements or their compounds. The knowledge of certain elements content in wines/fruit wines is of special interest due to their toxicity in case of excessive intake and also the effect they seem to have on the organoleptic properties of wine. Results: The study was focused on measuring the concentration levels of trace metals in fruit wines...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29214095/separation-and-determination-of-fe-iii-and-fe-ii-in-natural-and-waste-waters-using-silica-gel-sequentially-modified-with-polyhexamethylene-guanidine-and-tiron
#3
Svetlana Didukh, Vladimir Losev, Elena Borodina, Nikolay Maksimov, Anatoly Trofimchuk, Olga Zaporogets
Silica gel, sequentially modified with polyhexamethylene guanidine and pyrocatechin-3,5-disulfonic acid (Tiron), was suggested for sorption separation and determination of Fe(III) and Fe(II). It was found that quantitative extraction of Fe(III) and its separation from Fe(II) were attained at pH 2.5-4.0, while quantitative extraction of Fe(II) was observed at pH 6.0-7.5. An intensive signal with g = 4.27, which is characteristic for Fe(III), appeared in EPR spectra of the sorbents after Fe(II) and Fe(III) sorption...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29209555/validating-analytical-protocols-to-determine-selected-pesticides-and-pcbs-using-routine-samples
#4
Oscar Pindado Jiménez, Susana García Alonso, Rosa María Pérez Pastor
This study aims at providing recommendations concerning the validation of analytical protocols by using routine samples. It is intended to provide a case-study on how to validate the analytical methods in different environmental matrices. In order to analyze the selected compounds (pesticides and polychlorinated biphenyls) in two different environmental matrices, the current work has performed and validated two analytical procedures by GC-MS. A description is given of the validation of the two protocols by the analysis of more than 30 samples of water and sediments collected along nine months...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29201491/simultaneous-determination-of-six-active-components-in-oviductus-ranae-via-quantitative-analysis-of-multicomponents-by-single-marker
#5
Shihan Wang, Yang Xu, Yanwei Wang, Huailei Yang, Zuying Lv, Xiangqun Jin, Yongsheng Wang
A method, quantitative analysis of multicomponents by single marker (QAMS), was established in this article to investigate the quality control of a traditional Chinese medicine, Oviductus Ranae. 7-Hydroxycholesterol, 7-ketocholesterol, 4-cholesten-3-one, stigmasterol, 7-dehydrocholesterol, and cholesterol were selected as the indexes of quality evaluation of Oviductus Rana. The determination was achieved on an Agilent HC-C18 column (4.6 mm × 250 mm, 5 μm) using methanol with water (87 : 13 v/v) as mobile phase at the flow rate of 2...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29181224/application-of-19f-nmr-spectroscopy-for-content-determination-of-fluorinated-pharmaceuticals
#6
Alex O Okaru, Tobias S Brunner, Svenja M Ackermann, Thomas Kuballa, Stephan G Walch, Matthias Kohl-Himmelseher, Dirk W Lachenmeier
A simple, rapid, and selective quantitative nuclear magnetic resonance spectroscopic method was evaluated for the determination of the content of fluorinated pharmaceuticals. 19F NMR spectra were either obtained in dimethylsulfoxide-d6 or aqueous buffer, using trifluoroacetic acid as internal standard. Quantification of 13 fluorine-containing pharmaceuticals spanning various pharmacological classes was accomplished using the proposed method. The method was found to be fit for purpose (interday precision 1.2% relative standard deviation) and may thus be applied for routine analysis and quality control of fluorine-containing pharmaceuticals due to its simplicity, nondestructive sample measurement, reliability, and high specificity...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29181223/the-evidence-of-cooperative-binding-of-a-ligand-to-g4-dna
#7
A G Kudrev
Intrinsic constants of the ligand binding with G4 DNA (guanine-rich DNA sequence) using quantitative standards can be convenient providing the assessment for elucidating the possibility of such structures participation in biochemical processes. In the present communication, the hard + soft modelling approach to calculate intrinsic constants of a ligand binding with short DNA molecule, particularly such as G4 DNA, has been proposed. The suggested approach has focused upon the quantitative evaluating of a mutual influence between sites and between bound ligands...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29181222/validation-of-an-uhplc-ms-ms-method-for-screening-of-antimicrobial-residues-in-eggs-and-their-application-to-analyses-of-eggs-from-laying-hens-subjected-to-pharmacological-treatment
#8
Letícia Gomes Magnago Caldeira, Flávio Alves Santos, Andréa Melo Garcia de Oliveira, Josefa Abucater Lima, Leonardo Francisco de Souza, Guilherme Resende da Silva, Débora Cristina Sampaio de Assis, Silvana de Vasconcelos Cançado
A multiresidue method by UHPLC/MS-MS was optimized and validated for the screening and semiquantitative detection of antimicrobials residues from tetracyclines, aminoglycosides, quinolones, lincosamides, β-lactams, sulfonamides, and macrolides families in eggs. A qualitative approach was used to ensure adequate sensitivity to detect residues at the level of interest, defined as maximum residue limit (MRL), or less. The applicability of the methods was assessed by analyzing egg samples from hens that had been subjected to pharmacological treatment with neomycin, enrofloxacin, lincomycin, oxytetracycline, and doxycycline during five days and after discontinuation of medication (10 days)...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29181221/electroanalytical-sensing-of-bromides-using-radiolytically-synthesized-silver-nanoparticle-electrocatalysts
#9
Jadranka Milikić, Ivan Stoševski, Jelena Krstić, Zorica Kačarević-Popović, Šćepan Miljanić, Biljana Šljukić
Monitoring bromides (Br-) is of crucial importance since bromates, potential human carcinogens, are formed during ozonation of water containing bromides in concentrations >100 μg L-1. Within this study, silver (Ag) and four carbon-supported Ag catalysts were synthesized by the γ-radiation method and their morphology and structure examined using transmission electron microscopy, X-ray diffraction, and UV-Vis analysis. The nanocatalysts were tested for Br- sensing in aqueous media using cyclic voltammetry...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29123940/influence-of-digestion-procedure-and-residual-carbon-on-manganese-copper-and-zinc-determination-in-herbal-matrices-by-atomic-absorption-spectrometry
#10
Dorota Adamczyk-Szabela, Piotr Anielak, Wojciech M Wolf
Mineralization to the complete oxidation of sample carbon component does not always assure the best analyte recovery. Particular attention should be paid to the presence of silicon in the investigated plant sample and especially in the certified reference material for which Si content is scarcely given by the providers. During mineralization without addition of the hydrofluoric acid, the residual carbon may block silica surfaces and increase availability of an analyte for its spectral determination in the solution...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29123939/assessment-of-availability-and-human-health-risk-posed-by-arsenic-contaminated-well-waters-from-timis-bega-area-romania
#11
Marin Senila, Erika Levei, Oana Cadar, Lacrimioara Ramona Senila, Marius Roman, Ferenc Puskas, Mihaela Sima
Mobilization of As from geological materials into ground and drinking water sources may represent an important threat to human health. The objective of this study was to assess the As concentration and availability in underground water used as drinking water sources. Water samples were collected from public and private wells in Timis-Bega area of Pannonian Basin, West Romania. Total-dissolved As measured after "classical" filtration of water samples was in the range of 0.10-168 μg L(-1), thus exceeding the guideline value in majority of the samples...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29123938/uninformative-biological-variability-elimination-in-apple-soluble-solids-content-inspection-by-using-fourier-transform-near-infrared-spectroscopy-combined-with-multivariate-analysis-and-wavelength-selection-algorithm
#12
Lin Zhang, Baohua Zhang, Jun Zhou, Baoxing Gu, Guangzhao Tian
Uninformative biological variability elimination methods were studied in the near-infrared calibration model for predicting the soluble solids content of apples. Four different preprocessing methods, namely, Savitzky-Golay smoothing, multiplicative scatter correction, standard normal variate, and mean normalization, as well as their combinations were conducted on raw Fourier transform near-infrared spectra to eliminate the uninformative biological variability. Subsequently, robust calibration models were established by using partial least squares regression analysis and wavelength selection algorithms...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29119037/thermal-emission-of-alkali-metal-ions-from-al30-pillared-montmorillonite-studied-by-mass-spectrometric-method
#13
V B Motalov, N S Karasev, N L Ovchinnikov, M F Butman
The thermal emission of alkali metal ions from Al30-pillared montmorillonite in comparison with its natural form was studied by mass spectrometry in the temperature range 770-930 K. The measurements were carried out on a magnetic mass spectrometer MI-1201. For natural montmorillonite, the densities of the emission currents (j) decrease in the mass spectrum in the following sequence (T = 805 K, A/cm(2)): K(+) (4.55 · 10(-14)), Cs(+) (9.72 · 10(-15)), Rb(+) (1.13 · 10(-15)), Na(+) (1.75 · 10(-16)), Li(+) (3...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29093982/ratiometric-sensing-of-hydrogen-peroxide-utilizing-conformational-change-in-fluorescent-boronic-acid-polymers
#14
Kan Takeshima, Kanako Mizuno, Hitoshi Nakahashi, Hiroshi Aoki, Yasumasa Kanekiyo
We demonstrate that the copolymers containing boronic acid and pyrene units can be utilized for the fluorometric sensing of hydrogen peroxide (H2O2) in aqueous solutions. The copolymer exists in a relatively extended conformation in the absence of H2O2, whereas the polymer chain is contracted by the reaction of boronic acid moieties with H2O2 to form phenol groups. This conformational change induces aggregation of the originally isolated pyrene groups. As a result, relative intensity of excimer emission with respect to monomer emission increases with H2O2 concentration...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29093981/spe-uhplc-fld-method-for-the-simultaneous-determination-of-five-anthraquinones-in-human-urine-using-mixed-mode-bis-tetraoxacalix-2-arene-2-triazine-modified-silica-as-sorbent
#15
Kai Hu, Yonghui Qiao, Zhifen Deng, Mingxia Wu, Wei Liu
The five anthraquinones compounds (including aloe-emodin, emodin, physcion, chrysophanol, and rhein) are regarded as the main effective ingredients in rhubarb (Dahuang in Chinese, one of the commonly used Chinese herbal medicines). In this work, a simple and effective solid phase extraction (SPE) method based on bis(tetraoxacalix[2]arene[2]triazine) modified silica gel as adsorbent was developed. Coupled with UHPLC-FLD, the developed method was successfully applied for the measuring of main anthraquinones in human urine after oral administration of the extracts of rhubarb...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29075551/development-of-a-lc-ms-ms-method-for-the-simultaneous-detection-of-tricarboxylic-acid-cycle-intermediates-in-a-range-of-biological-matrices
#16
Omar Al Kadhi, Antonietta Melchini, Richard Mithen, Shikha Saha
It is now well-established that perturbations in the tricarboxylic acid (TCA) cycle play an important role in the metabolic transformation occurring in cancer including that of the prostate. A method for simultaneous qualitative and quantitative analysis of TCA cycle intermediates in body fluids, tissues, and cultured cell lines of human origin was developed using a common C18 reversed-phase column by LC-MS/MS technique. This LC-MS/MS method for profiling TCA cycle intermediates offers significant advantages including simple and fast preparation of a wide range of human biological samples...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29075550/molecular-marker-study-of-particulate-organic-matter-in-southern-ontario-air
#17
Satoshi Irei, Jacek Stupak, Xueping Gong, Tak-Wai Chan, Michelle Cox, Robert McLaren, Jochen Rudolph
To study the origins of airborne particulate organic matter in southern Ontario, molecular marker concentrations were studied at Hamilton, Simcoe, and York Gateway Tunnel, representing industrial, rural, and heavy traffic sites, respectively. Airborne particulate matter smaller than 10 μm in aerodynamic diameter was collected on quartz filters, and the collected samples were analyzed for total carbons, 5-6 ring PAHs, hopanes, n-alkanes (C20 to C34), and oxygenated aromatic compounds. Results showed that PAH concentrations at all three sites were highly correlated, indicating vehicular emissions as the major source...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29075549/polymorphism-in-commercial-sources-of-fusidic-acid-a-comparative-study-of-the-in-vitro-release-characteristics-of-forms-i-and-iii-from-a-marketed-pharmaceutical-cream
#18
Jonathan Byrne, Robert Reinhardt, Trinidad Velasco-Torrijos
A comparison of the polymorphic forms of 3 commercial sources of fusidic acid using FTIR and XRPD techniques has been performed in this study. It has been demonstrated that polymorphic Forms I and III are currently available on the commercial market. The influence of the observed polymorphism on the stability of the drug substance in bulk form has been investigated through stability and stress testing according to current ICH guidelines. Significant differences were detected between commercial sources with regard to the stability of the bulk substance under photolytic and humidity stress conditions...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29057141/transfer-and-metabolism-of-triadimefon-residues-from-rape-flowers-to-apicultural-products
#19
Ying-Hong Li, Bei-Lei Zhou, Ming-Rong Qian, Qiang Wang, Hu Zhang
This paper presents a study on the transfer and metabolism of triadimefon residues from rape flowers to apicultural products. In the field trials, honeybee colonies were placed in four rape greenhouses treated with triadimefon on standard dosage. Apicultural products (pollen, honey, and royal jelly) were collected on a regular basis. Sample preparation and extraction procedure were established. HPLC/ESI-MS/MS method was validated. The respective residues of triadimefon and metabolite triadimenol were 0.03 ± 0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29057140/quality-of-ceftriaxone-sodium-in-lyophilized-powder-for-injection-evaluated-by-clean-fast-and-efficient-spectrophotometric-method
#20
Patrícia Vidal de Aléssio, Ana Carolina Kogawa, Hérida Regina Nunes Salgado
Ceftriaxone sodium, an antimicrobial agent that plays an important role in clinical practice, is successfully used to treat infections caused by most Gram-positive and Gram-negative organisms. Since there are few rapid analytical methods for ceftriaxone analysis to use in the pharmaceutical routine, the aim of this research was to develop a new method able to quantify this cephalosporin. Therefore, a sensitive, rapid, simple UV spectrophotometric method for the determination and quantification of ceftriaxone sodium was proposed...
2017: Journal of Analytical Methods in Chemistry
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