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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/28203476/development-of-a-novel-sensitive-selective-and-fast-methodology-to-determine-malondialdehyde-in-leaves-of-melon-plants-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#1
Melisa E Yonny, Ariel Rodríguez Torressi, Mónica A Nazareno, Soledad Cerutti
Early production of melon plant (Cucumis melo) is carried out using tunnels structures, where extreme temperatures lead to high reactive oxygen species production and, hence, oxidative stress. Malondialdehyde (MDA) is a recognized biomarker of the advanced oxidative status in a biological system. Thus a reliable, sensitive, simple, selective, and rapid separative strategy based on ultra-high-performance liquid chromatography coupled to positive electrospray-tandem mass spectrometry (UPLC-(+)ESI-MS/MS) was developed for the first time to measure MDA, without derivatization, in leaves of melon plants exposed to stress conditions...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28194295/preparation-of-tio2-nanotubes-loaded-on-polyurethane-membrane-and-research-on-their-photocatalytic-properties
#2
Longli Lin, Qijun Wu, Xun Gong, Yu Zhang
To solve the problem of separation and recovery of photocatalyst in water, the modification of TiO2 was studied as well as its immobilization and photocatalytic properties. To improve surface properties, TiO2 nanotubes were synthesized by a hydrothermal method and silylated by silane coupling agents to introduce a certain functional group. Supported on polyurethane (PU) membrane, TiO2 nanotubes were prepared to produce immobilized PU/TiO2. Catalysts were characterized and identified by means of Fourier-transform infrared spectroscopy (FTIR), attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), and scanning electron microscopy (SEM)...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28191359/simultaneous-determination-of-5-flavonoids-and-7-saponins-for-quality-control-of-traditional-chinese-medicine-preparation-xinnaoshutong-capsule-using-hplc-vwd-elsd
#3
Jin Li, Yang Bai, Peng Zhang, Jun He, Jun Cao, Mingrui An, Li-Min Hu, Xiu-Mei Gao, Yan-Xu Chang
Xinnaoshutong capsule (XC) is a traditional Chinese prescription derived from the ripe fruit of Tribulus terrestris L. (TT). Although XC has long been considered as an important herbal medicine, no analytical method of marker compounds for quality assessment is registered in the Chinese Pharmacopoeia. A simple analytical method of twelve marker components was developed and validated by HPLC-VWD-ELSD method. Chromatographic separation by HPLC was carried out on a Hedera ODS 2 column (4.6 × 250 mm, 5 μm) by gradient elution with acetonitrile-water (0...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28168083/semiautomated-alignment-of-high-throughput-metabolite-profiles-with-chemometric-tools
#4
Ze-Ying Wu, Zhong-da Zeng, Zi-Dan Xiao, Daniel Kam-Wah Mok, Yi-Zeng Liang, Foo-Tim Chau, Hoi-Yan Chan
The rapid increase in the use of metabolite profiling/fingerprinting techniques to resolve complicated issues in metabolomics has stimulated demand for data processing techniques, such as alignment, to extract detailed information. In this study, a new and automated method was developed to correct the retention time shift of high-dimensional and high-throughput data sets. Information from the target chromatographic profiles was used to determine the standard profile as a reference for alignment. A novel, piecewise data partition strategy was applied for the determination of the target components in the standard profile as markers for alignment...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28168082/simultaneous-determination-of-dexamethasone-ondansetron-granisetron-tropisetron-and-azasetron-in-infusion-samples-by-hplc-with-dad-detection
#5
Fu-Chao Chen, Lin-Hai Wang, Jun Guo, Xiao-Ya Shi, Bao-Xia Fang
A simple and rapid high-performance liquid chromatography with diode array detector (HPLC-DAD) method has been developed and validated for simultaneous quantification of five antiemetic agents in infusion samples: dexamethasone, ondansetron, granisetron, tropisetron, and azasetron. The chromatographic separation was achieved on a Phenomenex C18 column (4.6 mm × 150 mm, 5 μm) using acetonitrile-50 mM KH2PO4 buffer-triethylamine (25 : 74 : 1; v/v; pH 4.0). Flow rate was 1.0 mL/min with a column temperature of 30°C...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28168081/tetracyclines-in-food-and-feedingstuffs-from-regulation-to-analytical-methods-bacterial-resistance-and-environmental-and-health-implications
#6
REVIEW
Fabio Granados-Chinchilla, César Rodríguez
Antibiotics are widely used as growth promoters in animal husbandry; among them, the tetracyclines are a chemical group of relevance, due to their wide use in agriculture, surpassing in quantities applied almost every other antibiotic family. Seeing the considerable amounts of tetracyclines used worldwide, monitoring of these antibiotics is paramount. Advances must be made in the analysis of antibiotics to assess correct usage and dosage of tetracyclines in food and feedstuffs and possible residues in pertinent environmental samples...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28154769/lc-ms-based-metabolic-fingerprinting-of-aqueous-humor
#7
Karolina Pietrowska, Diana Anna Dmuchowska, Paulina Samczuk, Tomasz Kowalczyk, Pawel Krasnicki, Malgorzata Wojnar, Aleksandra Skowronska, Zofia Mariak, Adam Kretowski, Michal Ciborowski
Aqueous humor (AH) is a transparent fluid which fills the anterior and posterior chambers of the eye. It supplies nutrients and removes metabolic waste from avascular tissues in the eye. Proper homeostasis of AH is required to maintain adequate intraocular pressure as well as optical and refractive properties of the eye. Application of metabolomics to study human AH may improve knowledge about the molecular mechanisms of eye diseases. Until now, global analysis of metabolites in AH has been mainly performed using NMR...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28116218/measurement-of-total-free-iron-in-soils-by-h2s-chemisorption-and-comparison-with-the-citrate-bicarbonate-dithionite-method
#8
Shui-Sheng Fan, Feng-Hsiang Chang, Hsin-Ta Hsueh, Tzu-Hsing Ko
Free iron is one of the major analytical items for soil basic properties. It is also an important indicator for understanding the genesis of soil, soil classification, and soil distribution behavior. In this study, an alternative analytical method (chemisorption) based on thermodynamic knowledge was proposed for measurement of total free iron oxides in soils. Several representative soil samples belonging to alfisols, ultisols, inceptisols, and entisols were collected from Taiwan and tested by the chemisorption, and the estimated total free iron oxides were compared with those measured from the traditional citrate bicarbonate dithionite (CBD) method...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28116217/diosgenin-recent-highlights-on-pharmacology-and-analytical-methodology
#9
REVIEW
Mafalda Jesus, Ana P J Martins, Eugenia Gallardo, Samuel Silvestre
Diosgenin, a steroidal sapogenin, occurs abundantly in plants such as Dioscorea alata, Smilax China, and Trigonella foenum graecum. This bioactive phytochemical not only is used as an important starting material for the preparation of several steroidal drugs in the pharmaceutical industry, but has revealed also high potential and interest in the treatment of various types of disorders such as cancer, hypercholesterolemia, inflammation, and several types of infections. Due to its pharmacological and industrial importance, several extraction and analytical procedures have been developed and applied over the years to isolate, detect, and quantify diosgenin, not only in its natural sources and pharmaceutical compositions, but also in animal matrices for pharmacodynamic, pharmacokinetic, and toxicological studies...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28097038/quantitative-analysis-in-combination-with-fingerprint-technology-and-chemometric-analysis-applied-for-evaluating-six-species-of-wild-paris-using-uhplc-uv-ms
#10
Yuangui Yang, Ji Zhang, Hang Jin, Jinyu Zhang, Yuanzhong Wang
A fast method was developed by ultra high performance liquid chromatography (UHPLC) for simultaneous determination of polyphyllin I and polyphyllin II. Chemometric analyses including principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA) based on UHPLC chromatography were used to evaluate 38 batches from six species of Paris. Variable importance of projection was applied to select important peaks. Meanwhile, similarity analysis of UHPLC fingerprint was used to evaluate the sample of Paris polyphylla yunnanensis (PPY) and P...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28078163/catalase-based-modified-graphite-electrode-for-hydrogen-peroxide-detection-in-different-beverages
#11
Giovanni Fusco, Paolo Bollella, Franco Mazzei, Gabriele Favero, Riccarda Antiochia, Cristina Tortolini
A catalase-based (NAF/MWCNTs) nanocomposite film modified glassy carbon electrode for hydrogen peroxide (H2O2) detection was developed. The developed biosensor was characterized in terms of its bioelectrochemical properties. Cyclic voltammetry (CV) technique was employed to study the redox features of the enzyme in the absence and in the presence of nanomaterials dispersed in Nafion® polymeric solution. The electron transfer coefficient, α, and the electron transfer rate constant, ks , were found to be 0...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28070446/immobilization-of-ntpdase-1-from-trypanosoma-cruzi-and-development-of-an-online-label-free-assay
#12
Felipe Antunes Calil, Juliana Maria Lima, Arthur Henrique Cavalcante de Oliveira, Christiane Mariotini-Moura, Juliana Lopes Rangel Fietto, Carmen Lucia Cardoso
The use of IMERs (Immobilized Enzyme Reactors) as a stationary phase coupled to high performance chromatographic systems is an interesting approach in the screening of new ligands. In addition, IMERs offer many advantages over techniques that employ enzymes in solution. The enzyme nucleoside triphosphate diphosphohydrolase (NTPDase-1) from Trypanosoma cruzi acts as a pathogen infection facilitator, so it is a good target in the search for inhibitors. In this paper, immobilization of NTPDase-1 afforded ICERs (Immobilized Capillary Enzyme Reactors)...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28070445/application-of-multivariable-analysis-and-ftir-atr-spectroscopy-to-the-prediction-of-properties-in-campeche-honey
#13
Francisco Anguebes, Lucio Pat, Bassam Ali, Armando Guerrero, Atl V Córdova, Mohamed Abatal, José P Garduza
Attenuated total reflectance-Fourier transform infrared spectrometry and chemometrics model was used for determination of physicochemical properties (pH, redox potential, free acidity, electrical conductivity, moisture, total soluble solids (TSS), ash, and HMF) in honey samples. The reference values of 189 honey samples of different botanical origin were determined using Association Official Analytical Chemists, (AOAC), 1990; Codex Alimentarius, 2001, International Honey Commission, 2002, methods. Multivariate calibration models were built using partial least squares (PLS) for the measurands studied...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28058132/preparation-of-a-specific-ssdna-aptamer-for-brevetoxin-2-using-selex
#14
Rui-Yun Tian, Chao Lin, Shi-Yu Yu, Sheng Gong, Pan Hu, Yan-Song Li, Zong-Cheng Wu, Yang Gao, Yu Zhou, Zeng-Shan Liu, Hong-Lin Ren, Shi-Ying Lu
The existing assays for detecting brevetoxin (BTX) depend on expensive equipment with a professional operator or on an antibody with limited stability, which requires complex processes, a high cost, and a considerable amount of time. The development of an alternative detection probe is another promising research direction. This paper reports the use of aptamers binding to BTX-2 in an analytical assay using the systematic evolution of ligands by exponential enrichment (SELEX). After 12 rounds of selection, the secondary structures of 25 sequences were predicted...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28053802/intravascular-residence-time-determination-for-the-cyanide-antidote-dimethyl-trisulfide-in-rat-by-using-liquid-liquid-extraction-coupled-with-high-performance-liquid-chromatography
#15
Deepthika De Silva, Steven Lee, Anna Duke, Siva Angalakurthi, Ching-En Chou, Afshin Ebrahimpour, David E Thompson, Ilona Petrikovics
These studies represent the first report on the intravascular residence time determinations for the cyanide antidote dimethyl trisulfide (DMTS) in a rat model by using high performance liquid chromatography coupled with ultraviolet absorption spectroscopy (HPLC-UV). The newly developed sample preparation included liquid-liquid extraction by cyclohexanone. The calibration curves showed a linear response for DMTS concentrations between 0.010 and 0.30 mg/mL with R(2) = 0.9994. The limit of detection for DMTS via this extraction method was 0...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28042493/influence-of-extreme-storage-conditions-on-extra-virgin-olive-oil-parameters-traceability-study
#16
Alfredo Escudero, Natividad Ramos, M Dolores La Rubia, Rafael Pacheco
This study reflects the effect of extreme storage conditions on several extra virgin olive oil (EVOO) varieties (arbequina, hojiblanca, and picual). The conditions were simulated in the laboratory, by means of heating treatments in stove at different temperatures (40 and 60°C) and times (two and three weeks). The aim is the evaluation of the deterioration of the quality parameters and minority components, which are responsible for the nutritional and therapeutic properties (fatty acids, polyphenols, pigments, and tocopherols), and organoleptic qualities...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28042492/mass-spectrometry-of-polymer-electrolyte-membrane-fuel-cells
#17
Viktor Johánek, Anna Ostroverkh, Roman Fiala, Andrii Rednyk, Vladimír Matolín
The chemical analysis of processes inside fuel cells under operating conditions in either direct or inverted (electrolysis) mode and their correlation with potentiostatic measurements is a crucial part of understanding fuel cell electrochemistry. We present a relatively simple yet powerful experimental setup for online monitoring of the fuel cell exhaust (of either cathode or anode side) downstream by mass spectrometry. The influence of a variety of parameters (composition of the catalyst, fuel type or its concentration, cell temperature, level of humidification, mass flow rate, power load, cell potential, etc...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28042491/accurate-assessment-of-the-oxygen-reduction-electrocatalytic-activity-of-mn-polypyrrole-nanocomposites-based-on-rotating-disk-electrode-measurements-complemented-with-multitechnique-structural-characterizations
#18
Patrizia Bocchetta, Carolina Ramírez Sánchez, Antonietta Taurino, Benedetto Bozzini
This paper reports on the quantitative assessment of the oxygen reduction reaction (ORR) electrocatalytic activity of electrodeposited Mn/polypyrrole (PPy) nanocomposites for alkaline aqueous solutions, based on the Rotating Disk Electrode (RDE) method and accompanied by structural characterizations relevant to the establishment of structure-function relationships. The characterization of Mn/PPy films is addressed to the following: (i) morphology, as assessed by Field-Emission Scanning Electron Microscopy (FE-SEM) and Atomic Force Microscope (AFM); (ii) local electrical conductivity, as measured by Scanning Probe Microscopy (SPM); and (iii) molecular structure, accessed by Raman Spectroscopy; these data provide the background against which the electrocatalytic activity can be rationalised...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28018704/synthesis-and-characterization-of-molecular-imprinting-polymer-microspheres-of-piperine-extraction-of-piperine-from-spiked-urine
#19
Rachel Marcella Roland, Showkat Ahmad Bhawani
Molecularly imprinted polymer (MIP) microspheres for Piperine were synthesized by precipitation polymerization with a noncovalent approach. In this research Piperine was used as a template, acrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linker, and 2,2'-azobisisobutyronitrile (AIBN) as an initiator and acetonitrile as a solvent. The imprinted and nonimprinted polymer particles were characterized by using Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM)...
2016: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28003929/rapid-quantitative-analysis-of-forest-biomass-using-fourier-transform-infrared-spectroscopy-and-partial-least-squares-regression
#20
Gifty E Acquah, Brian K Via, Oladiran O Fasina, Lori G Eckhardt
Fourier transform infrared reflectance (FTIR) spectroscopy has been used to predict properties of forest logging residue, a very heterogeneous feedstock material. Properties studied included the chemical composition, thermal reactivity, and energy content. The ability to rapidly determine these properties is vital in the optimization of conversion technologies for the successful commercialization of biobased products. Partial least squares regression of first derivative treated FTIR spectra had good correlations with the conventionally measured properties...
2016: Journal of Analytical Methods in Chemistry
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