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Journal of Analytical Methods in Chemistry

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https://www.readbyqxmd.com/read/28386512/study-of-chemical-intermediates-by-means-of-atr-ir-spectroscopy-and-hybrid-hard-and-soft-modelling-multivariate-curve-resolution-alternating-least-squares
#1
Junxiu Ma, Juan Qi, Xinyu Gao, Chunhua Yan, Tianlong Zhang, Hongsheng Tang, Hua Li
3,5-Diamino-1,2,4-triazole (DAT) became a significant energetic materials intermediate, and the study of its reaction mechanism has fundamental significance in chemistry. The aim of this study is to investigate the ability of online attenuated total reflection infrared (ATR-IR) spectroscopy combined with the novel approach of hybrid hard- and soft-modelling multivariate curve resolution-alternating least squares (HS-MCR) analysis to monitor and detect changes in structural properties of compound during 3,5-diamino-1,2,4-triazole (DAT) synthesis processes...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28357152/a-highly-sensitive-multicommuted-flow-analysis-procedure-for-photometric-determination-of-molybdenum-in-plant-materials-without-a-solvent-extraction-step
#2
Felisberto G Santos, Boaventura F Reis
A highly sensitive analytical procedure for photometric determination of molybdenum in plant materials was developed and validated. This procedure is based on the reaction of Mo(V) with thiocyanate ions (SCN(-)) in acidic medium to form a compound that can be monitored at 474 nm and was implemented employing a multicommuted flow analysis setup. Photometric detection was performed using an LED-based photometer coupled to a flow cell with a long optical path length (200 mm) to achieve high sensitivity, allowing Mo(V) determination at a level of μg L(-1) without the use of an organic solvent extraction step...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28348920/a-new-kinetic-spectrophotometric-method-for-the-quantitation-of-amorolfine
#3
César Soto, Cristian Poza, David Contreras, Jorge Yáñez, Fallon Nacaratte, M Inés Toral
Amorolfine (AOF) is a compound with fungicide activity based on the dual inhibition of growth of the fungal cell membrane, the biosynthesis and accumulation of sterols, and the reduction of ergosterol. In this work a sensitive kinetic and spectrophotometric method for the AOF quantitation based on the AOF oxidation by means of KMnO4 at 30 min (fixed time), pH alkaline, and ionic strength controlled was developed. Measurements of changes in absorbance at 610 nm were used as criterion of the oxidation progress...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28348919/optimized-multiresidue-analysis-of-organic-contaminants-of-priority-concern-in-a-daily-consumed-fish-grass-carp
#4
Wei He, Yanru Chen, Chen Yang, Wenxiu Liu, Xiangzhen Kong, Ning Qin, Qishuang He, Fuliu Xu
The organic contaminants, including polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs), and polychlorinated biphenyls (PCBs), are of priority concern because of their persistence, toxicity, and long-distance transportation in global environment. Their residues in a daily consumed fish (grass carp) pose potential threat to human health and aquatic ecosystems. The present study optimized an analytical protocol of microwave-assisted extraction (MAE), lip-removal by gel permeation chromatography (GPC), cleanup by solid phase cartridge (SC) or adsorption chromatography column (CC), and gas chromatography-mass spectrometry (GC/MS)...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28326222/acupuncture-injection-combined-with-electrokinetic-injection-for-polydimethylsiloxane-microfluidic-devices
#5
Ji Won Ha
We recently reported acupuncture sample injection that leads to reproducible injection of nL-scale sample segments into a polydimethylsiloxane (PDMS) microchannel for microchip capillary electrophoresis. The advantages of the acupuncture injection in microchip capillary electrophoresis include capability of minimizing sample loss and voltage control hardware and capability of introducing sample plugs into any desired position of a microchannel. However, the challenge in the previous study was to achieve reproducible, pL-scale sample injections into PDMS microchannels...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28255502/stability-study-of-algerian-nigella-sativa-seeds-stored-under-different-conditions
#6
Muhammad Safwan Ahamad Bustamam, Kamarul Arifin Hadithon, Ahmed Mediani, Faridah Abas, Yaya Rukayadi, Nordin Lajis, Khozirah Shaari, Intan Safinar Ismail
In a study to determine the stability of the main volatile constituents of Nigella sativa seeds stored under several conditions, eight storage conditions were established, based on the ecological abiotic effects of air, heat, and light. Six replicates each were prepared and analyzed with Headspace-Gas Chromatography-Mass Spectrometry (HS-GC-MS) for three time points at the initial (1st day (0)), 14th (1), and 28th (2) day of storage. A targeted multivariate analysis of Principal Component Analysis revealed that the stability of the main volatile constituents of the whole seeds was better than that of the ground seeds...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28255501/chemical-composition-physicochemical-characteristics-and-nutritional-value-of-lannea-kerstingii-seeds-and-seed-oil
#7
Judicaël Thomas Ouilly, Patrice Bazongo, Adjima Bougma, Nèbpawindé Kaboré, Anne Mette Lykke, Amadé Ouédraogo, Imaël Henri Nestor Bassolé
The chemical composition, main physicochemical properties, and nutritional value of seed flour and seed oil of Lannea kerstingii were studied. The results indicated that seeds contained 3.61% moisture, 57.85% fat, 26.39% protein, 10.07% carbohydrates, and 2.08% ash. Potassium was the predominant mineral, followed by magnesium and calcium. The essential amino acids were at higher levels than the estimated amino acid requirements of FAO/WHO/UNU except for lysine. Fatty acid composition showed that oleic acid was the major fatty acid, followed by palmitic, linoleic, and stearic acids...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28255500/pencil-graphite-electrodes-a-versatile-tool-in-electroanalysis
#8
REVIEW
Iulia Gabriela David, Dana-Elena Popa, Mihaela Buleandra
Due to their electrochemical and economical characteristics, pencil graphite electrodes (PGEs) gained in recent years a large applicability to the analysis of various types of inorganic and organic compounds from very different matrices. The electrode material of this type of working electrodes is constituted by the well-known and easy commercially available graphite pencil leads. Thus, PGEs are cheap and user-friendly and can be employed as disposable electrodes avoiding the time-consuming step of solid electrodes surface cleaning between measurements...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28246574/transfer-assessment-of-carbendazim-residues-from-rape-flowers-to-apicultural-products
#9
Ying-Hong Li, Bei-Lei Zhou, Ming-Rong Qian, Qiang Wang, Hu Zhang
Carbendazim is usually used to control the Sclerotinia sclerotiorum of rapes during the flowering period. This paper presents a study on transfer assessment of carbendazim residues from rape flowers to apicultural products. In the field trials, the rapes were sprayed with carbendazim on standard dosage. Bees produced apicultural products (bee pollen, honey, and royal jelly) from sprayed rapes. Apicultural products were collected on a regular basis. Carbendazim residues were extracted from bee pollen, honey, and royal jelly, respectively...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28243484/structural-and-quantitative-analysis-of-three-c-glycosylflavones-by-variable-temperature-proton-quantitative-nuclear-magnetic-resonance
#10
Jing Liu, Yang Liu, Zhong Dai, Lan He, Shuangcheng Ma
Quantitative nuclear magnetic resonance is a powerful tool in drug analysis because of its speed, precision, and efficiency. In present study, the application of variable temperature proton quantitative nuclear magnetic resonance (VT-(1)H-qNMR) for the calibration of three C-glycosylflavones including orientin, isoorientin, and schaftoside as reference substances was reported. Since there was conformational equilibrium due to the restricted rotation around the C(sp(3))-C(sp(2)) bond in C-glycosylflavones, the conformational behaviors were investigated by VT-NMR and verified by molecular mechanics (MM) calculation...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28243483/the-application-of-ft-ir-spectroscopy-for-quality-control-of-flours-obtained-from-polish-producers
#11
Katarzyna Sujka, Piotr Koczoń, Alicja Ceglińska, Magdalena Reder, Hanna Ciemniewska-Żytkiewicz
Samples of wheat, spelt, rye, and triticale flours produced by different Polish mills were studied by both classic chemical methods and FT-IR MIR spectroscopy. An attempt was made to statistically correlate FT-IR spectral data with reference data with regard to content of various components, for example, proteins, fats, ash, and fatty acids as well as properties such as moisture, falling number, and energetic value. This correlation resulted in calibrated and validated statistical models for versatile evaluation of unknown flour samples...
2017: Journal of Analytical Methods in Chemistry
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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