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International Journal of Analytical Chemistry

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https://www.readbyqxmd.com/read/29997651/the-activity-concentrations-and-radium-equivalent-activity-in-soil-samples-collected-from-the-eastern-part-of-basrah-governorate-in-southern-iraq
#1
Rasha S Ahmed, Raghad S Mohammed, Rana O Abdaljalil
Clay soil samples (0, 30, and 60 cm depths) were collected from two districts (Abu Al Khasib and Ad Dayr) in Basrah governorate in southern Iraq for gamma-ray spectroscopy. The activity concentrations for natural existing radionuclides in 18 soil samples were measured using high-purity germanium detector HPGe. From the obtained results of γ -ray spectroscopy, the 238 U activity concentrations were found to be ranging from 2.4 to 5.6 ppm with an average of 3.5 ppm in Abu Al Khasib and ranging from 2.1 to 4...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29983713/inter-laboratory-validation-of-method-to-determine-residual-enrofloxacin-in-chicken-meat
#2
Joo Hee Chung, Kun Cho, Seongnyeon Kim, So Hyeon Jeon, Jeoung Hwa Shin, Jueun Lee, Yun Gyong Ahn
An inter-laboratory study was performed to evaluate the performance of a method developed for the quantification of enrofloxacin in chicken meat. Liquid-liquid extraction combined with a clean-up procedure based on solid-phase extraction followed by a liquid chromatography-tandem mass spectrometric method was used by three individual laboratories. All the investigated results of calibration curves and limits of quantification were within the acceptable range for regulatory testing of enrofloxacin. The three laboratories received blind a certified reference material to analyze in triplicate and assess using statistical analysis...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29983712/tempo-functionalized-nanoporous-au-nanocomposite-for-the-electrochemical-detection-of-h-2-o-2
#3
Dongxiao Wen, Qianrui Liu, Ying Cui, Huaixia Yang, Jinming Kong
A novel nanocomposite of nanoporous gold nanoparticles (np-AuNPs) functionalized with 2,2,6,6-tetramethyl-1-piperidinyloxy radical (TEMPO) was prepared; assembled carboxyl groups on gold nanoporous nanoparticles surface were combined with TEMPO by the "bridge" of carboxylate-zirconium-carboxylate chemistry. SEM images and UV-Vis spectroscopies of np-AuNPs indicated that a safe, sustainable, and simplified one-step dealloying synthesis approach is successful. The TEMPO-np-AuNPs exhibited a good performance for the electrochemical detection of H2 O2 due to its higher number of electrochemical activity sites and surface area of 7...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29977296/design-of-optical-sensor-membrane-based-on-polymer-poly-methyl-methacrylate-for-paracetamol-detection-in-traditional-herbal-medicine
#4
Rimadani Pratiwi, Shelvy Elizabeth Suherman, Rajkannah A L Poongan, Mutakin Mutakin, Aliya Nur Hasanah
Generally, regulation states that herbal medicines are remedies containing plants or preparation of plants as active ingredients only. Paracetamol is one of the drugs that is frequently added in herbal medicine to enhance the effect as an analgesic. The government regulation disallows chemical drugs contained in herbal medicine due to the toxic effect of uncontrolled consumption. On this study, the optical sensor membrane from polymer poly(methyl methacrylate) (PMMA) was synthesized by phase inversion method and was used to detect paracetamol in herbal medicine...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29977295/fabrication-of-ache-sno-2-cmwcnts-cu-nanocomposite-based-sensor-electrode-for-detection-of-methyl-parathion-in-water
#5
Vikas Dhull
The work highlights inhibition-based Acetylcholinesterase (AChE) fabrication using composite nanomaterial comprising tin oxide nanoparticles (SnO2 ) and carboxylated multiwalled carbon nanotubes (cMWCNTs) for detection of pesticide methyl parathion (MP) in water samples. Working electrode AChE/SnO2 -cMWCNTs/Cu exhibited high sensitivity with a linearity range of 1.0  μ M to 160  μ M and a minimum detection limit of 0.1  μ M for MP in water. The fabricated electrode was found biocompatible and nontoxic which can be used to detect low concentrations of pesticide in water samples...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29955229/isocratic-resolution-of-fluoroquinolone-based-antibiotics-on-the-phenylethyl-bonded-phase-under-nonaqueous-elution-a-consideration-of-the-separation-mechanism
#6
Yu-Xuan Gao, Shushi Chen
This paper reports the isocratic resolution of 10 fluoroquinolone-based antibiotics and their precursors on the phenylethyl-bonded phase under the elution of the nonaqueous mobile phase composed of acetonitrile, methanol, acetic acid, and triethylamine. Most of the analytes were baseline resolved within 10 minutes. The interaction simulation and Fourier-transform infrared spectroscopy (FTIR) data indicated that the carbonyl-containing group, a secondary or tertiary amine of an analyte, was heavily involved in the retention, resulting in retention with residual silanol groups on the stationary phase...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29951096/conformational-and-functional-properties-of-soybean-proteins-produced-by-extrusion-hydrolysis-approach
#7
Wenjun Ma, Baokun Qi, Rokayya Sami, Lianzhou Jiang, Yang Li, Hui Wang
The conformational and functional changes of soybean protein after a hybrid extrusion-hydrolysis method were evaluated. Three extrusion temperatures (60, 80, and 100°C) were used prior to enzymatic hydrolysis. The hydrolysis degrees, molecular weight profiles, solubilities, surface hydrophobicities, sulphydryl contents, disulfide bound, water holding capacity, emulsion, and foam properties of the protein isolated from the enzyme-hydrolyzed extruded soybeans were analyzed. It shows that extrusion caused significant changes in the hydrophobicity, molecular weight distribution, solubility, surface hydrophobicity, emulsification activity, and stability of the protein...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29861732/development-and-validation-of-a-simple-high-performance-liquid-chromatography-uv-method-for-simultaneous-determination-of-urinary-uric-acid-hypoxanthine-and-creatinine-in-human-urine
#8
Nimanthi Wijemanne, Preethi Soysa, Sulochana Wijesundara, Hemamali Perera
Uric acid and hypoxanthine are produced in the catabolism of purine. Abnormal urinary levels of these products are associated with many diseases and therefore it is necessary to have a simple and rapid method to detect them. Hence, we report a simple reverse phase high performance liquid chromatography (HPLC/UV) technique, developed and validated for simultaneous analysis of uric acid, hypoxanthine, and creatinine in human urine. Urine was diluted appropriately and eluted with C-18 column 100 mm × 4.6 mm with a C-18 precolumn 25 mm × 4...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29853897/development-of-isocratic-rp-hplc-method-for-separation-and-quantification-of-l-citrulline-and-l-arginine-in-watermelons
#9
Rasdin Ridwan, Hairil Rashmizal Abdul Razak, Mohd Ilham Adenan, Wan Mazlina Md Saad
Watermelons (Citrullus lanatus) are known to have sufficient amino acid content. In this study, watermelons grown and consumed in Malaysia were investigated for their amino acid content, L-citrulline and L-arginine, by the isocratic RP-HPLC method. Flesh and rind watermelons were juiced, and freeze-dried samples were used for separation and quantification of L-citrulline and L-arginine. Three different mobile phases, 0.7% H3 P04 , 0.1% H3 P04 , and 0.7% H3 P04  : ACN (90 : 10), were tested on two different columns using Zorbax Eclipse XDB-C18 and Gemini C18 with a flow rate of 0...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29849643/rapid-screening-of-volatile-organic-compounds-from-aframomum-danielli-seeds-using-headspace-solid-phase-microextraction-coupled-to-gas-chromatography-mass-spectrometry
#10
Mosotho J George, Patrick B Njobeh, Sefater Gbashi, Gabriel O Adegoke, Ian A Dubery, Ntakadzeni E Madala
Volatile organic compounds (VOCs) derived from plants have been used in the fragrance industry since time immemorial. Herein we report on the rapid screening of VOCs from seeds of ripe Aframomum danielli (family, Zingiberaceae) using a polydimethylsiloxane fibre headspace solid phase microextraction coupled to a gas chromatography mass spectrometry (SPME-GC/MS) instrument. Portions of 0.25, 0.35, and 0.50 g of ground sample were weighed and extraction of volatile organic compounds (VOCs) was achieved using a 100  μ m polydimethylsiloxane solid phase microextraction (PDMS SPME) fibre, with the equilibrium time of 40 minutes and extraction temperature of 50°C; the following compounds with their respective relative abundances were obtained as the top ten most abundant and annotated ones using NIST, Wiley, and Fragrances Libraries: eucalyptol (58%); β -pinene (22%); α -pinene (7...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29849642/molecular-distributions-of-soluble-oxidation-products-from-coals-characterized-by-mass-spectrometers
#11
Xing Fan, Fei Wang
Oxidation of three coals with rank from lignite to anthracite in NaOCl aqueous solution was investigated in this study. The oxidation products were characterized by using gas chromatography/mass spectrometry and direct analysis in real-time mass spectrometry. The results showed that most of organic compounds in coals were converted into water-soluble species under mild conditions, even the anthracite. Benzene polycarboxylic acids (BPCAs) and chloro-substituted alkanoic acids (CSAAs) were major products from the reactions...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29849641/characterization-of-food-structures-and-functionalities
#12
EDITORIAL
Xingxun Liu, Ying Yang, Changmou Xu, Jiajia Rao
No abstract text is available yet for this article.
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29849640/infant-exposure-to-metals-through-consumption-of-formula-feeding-in-mekelle-ethiopia
#13
Tadele Eticha, Melat Afrasa, Getu Kahsay, Hailekiros Gebretsadik
This study aimed at determination of heavy metals (cadmium, lead, and zinc) in milk-based infant formulas collected from Mekelle, Ethiopia, and their associated health risks to the infants through consumption of these products. The infant feeding samples were dry-ashed in a muffle furnace followed by digestion in nitric acid and the resulting solutions were analyzed by flame atomic absorption spectrophotometer. Cadmium was not detected in the samples while the levels of lead and zinc ranged from not detected value to 0...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29849639/analyses-of-essential-elements-and-heavy-metals-by-using-icp-ms-in-maternal-breast-milk-from-%C3%A5-anl%C3%A4-urfa-turkey
#14
Serap Kılıç Altun, Hikmet Dinç, Füsun Karaçal Temamoğulları, Nilgün Paksoy
Maternal breast milk is a unique biological matrix that contains essential micronutrients. Potentially heavy metals may also affect infants' health and growth through maternal breast milk. The purpose of this study was to determine and compare the essential elements and heavy metals of maternal breast milk of nursery mothers residing in Şanlıurfa province, Turkey. Maternal breast milk concentrations of sodium, magnesium, phosphorus, potassium, calcium, iron, copper, zinc, arsenic, and lead were analyzed in a random sample of the first time in urban and suburban nursery Turkish mothers ( n : 42)...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29743890/rheological-behavior-of-tomato-fiber-suspensions-produced-by-high-shear-and-high-pressure-homogenization-and-their-application-in-tomato-products
#15
Yong Wang, Ping Sun, He Li, Benu P Adhikari, Dong Li
This study investigated the effects of high shear and high pressure homogenization on the rheological properties (steady shear viscosity, storage and loss modulus, and deformation) and homogeneity in tomato fiber suspensions. The tomato fiber suspensions at different concentrations (0.1%-1%, w/w) were subjected to high shear and high pressure homogenization and the morphology (distribution of fiber particles), rheological properties, and color parameters of the homogenized suspensions were measured. The homogenized suspensions were significantly more uniform compared to unhomogenized suspension...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29707002/determination-of-pyrethroids-in-tea-brew-by-gc-ms-combined-with-spme-with-multiwalled-carbon-nanotube-coated-fiber
#16
Dongxia Ren, Chengjun Sun, Guanqun Ma, Danni Yang, Chen Zhou, Jiayu Xie, Yongxin Li
A new method has been developed to simultaneously determine 7 pyrethroid residues in tea brew using gas chromatography-mass spectrometry (GC-MS) combined with solid phase microextraction (SPME) with multiwalled carbon nanotubes (MWCNTs) coated fiber. The MWCNTs coated fiber of SPME was homemade by using stainless steel wire as coating carrier and polyacrylonitrile (PAN) solution as adhesive glue. Under the optimized conditions, a good linearity was shown for bifenthrin, fenpropathrin, permethrin, and cyfluthrin in 1-50 ng mL-1 and for cypermethrin, fenvalerate, and deltamethrin in 5-50 ng mL-1 ...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29692811/antifungal-compound-isolated-from-catharanthus-roseus-l-pink-for-biological-control-of-root-rot-rubber-diseases
#17
R Zahari, N Halimoon, M F Ahmad, S K Ling
Rigidoporus microporus, Ganoderma philippii, and Phellinus noxius are root rot rubber diseases and these fungi should be kept under control with environmentally safe compounds from the plant sources. Thus, an antifungal compound isolated from Catharanthus roseus was screened for its effectiveness in controlling the growth of these fungi. The antifungal compound isolated from C. roseus extract was determined through thin layer chromatography (TLC) and nuclear magnetic resonance (NMR) analysis. Each C. roseus of the DCM extracts was marked as CRD1, CRD2, CRD3, CRD4, CRD5, CRD6, and CRD7, respectively...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29623092/a-data-mining-approach-to-improve-inorganic-characterization-of-amanita-ponderosa-mushrooms
#18
Cátia Salvador, M Rosário Martins, Henrique Vicente, A Teresa Caldeira
Amanita ponderosa are wild edible mushrooms that grow in some microclimates of Iberian Peninsula. Gastronomically this species is very relevant, due to not only the traditional consumption by the rural populations but also its commercial value in gourmet markets. Mineral characterisation of edible mushrooms is extremely important for certification and commercialization processes. In this study, we evaluate the inorganic composition of Amanita ponderosa fruiting bodies (Ca, K, Mg, Na, P, Ag, Al, Ba, Cd, Cr, Cu, Fe, Mn, Pb, and Zn) and their respective soil substrates from 24 different sampling sites of the southwest Iberian Peninsula (e...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29619049/the-effects-of-storage-conditions-on-lycopene-content-and-color-of-tomato-hot-pot-sauce
#19
He Li, Jian Zhang, Yong Wang, Jian Li, Yihe Yang, Xinqi Liu
Tomato hot pot sauce (THPS) at different storage temperatures (0, 25, and 37°C) and with two kinds of packaging for 120 days was investigated in this study. High performance liquid chromatography was employed for detecting lycopene and 5-hydroxymethylfurfural (HMF). The changes of lycopene and HMF during storage were regressed with kinetic equation of both zero-order and first-order models, and the latter fitted better. The kinetic equation constant ( k value) of lycopene or HMF at 37°C was higher than that at 25°C...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29581723/optimum-extraction-characterization-and-antioxidant-activities-of-polysaccharides-from-flowers-of-dendrobium-devonianum
#20
Donghui Wang, Bei Fan, Yan Wang, Lijing Zhang, Fengzhong Wang
Response surface methodology (RSM) was employed to optimize the conditions for the ultrasonic-assisted extraction (UAE) of polysaccharides from the flowers of Dendrobium devonianum . The optimal conditions for the maximum yields of DDFPs are as follows: an extraction temperature of 63.13°C, an extraction time of 53.10 min, and a water-to-raw material ratio of 22.11 mL/g. Furthermore, three fractions (DDFPs30, DDFPs50, and DDFPs70) were prepared from Dendrobium devonianum flowers polysaccharides (DDFPs) by the stepwise ethanol precipitation method...
2018: International Journal of Analytical Chemistry
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