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International Journal of Analytical Chemistry

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https://www.readbyqxmd.com/read/28791049/effectiveness-of-liquid-liquid-extraction-solid-phase-extraction-and-headspace-technique-for-determination-of-some-volatile-water-soluble-compounds-of-rose-aromatic-water
#1
Hale Seçilmiş Canbay
Steam distillation is used to isolate scent of rose flowers. Rose aromatic water is commonly used in European cuisine and aromatherapy besides its use in cosmetic industry for its lovely scent. In this study, three different sampling techniques, liquid-liquid extraction (LLE), headspace technique (HS), and solid phase extraction (SPE), were compared for the analysis of volatile water-soluble compounds in commercial rose aromatic water. Some volatile water-soluble compounds of rose aromatic water were also analyzed by gas chromatography mass spectrometry (GCMS)...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28757871/quantification-of-barbatusin-and-3%C3%AE-hydroxy-3-deoxybarbatusin-in-plectranthus-species-by-hplc-dad
#2
Maria Goretti de Vasconcelos Silva, Leandro Bezerra Lima, Maria da Conceição Ferreira de Oliveira, Marcos Carlos de Mattos, Jair Mafezoli
The concentration of diterpenes barbatusin (1) and 3β-hydroxy-3-deoxybarbatusin (2) in the extracts from leaves of Plectranthus grandis, P. barbatus, P. ornatus, and P. amboinicus was evaluated by HPLC-DAD analysis on a Luna C-18 column, using isocratic mixtures of water and acetonitrile as eluents. The regression equations were obtained with good linearity (r(2) > 0.99) and limit of quantifications was higher than 0.1 µg/mL. The precision (lower than 3.5%, within day) and accuracy (higher than 81.7% and lower than 107...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28751914/geochemical-characteristics-and-origins-of-the-crude-oil-of-triassic-yanchang-formation-in-southwestern-yishan-slope-ordos-basin
#3
Xiaoli Zhang, Jinxian He, Yande Zhao, Hongchen Wu, Zeqiang Ren
Biomarker compounds that derived from early living organisms play an important role in oil and gas geochemistry and exploration since they can record the diagenetic evolution of the parent materials of crude oil and reflect the organic geochemical characteristics of crude oil and source rocks. To offer scientific basis for oil exploration and exploitation for study area, gas chromatography-mass spectrometry method is applied to study the biomarker compounds of crude oil in Southwestern Yishan Slope of Ordos Basin, through qualitatively and quantitatively analyzing separated materials...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28694825/rapid-separation-of-indole-glucosinolates-in-roots-of-chinese-cabbage-brassica-rapa-subsp-pekinensis-by-high-performance-liquid-chromatography-with-diode-array-detection
#4
Alfredo Aires, Rosa Carvalho
Glucosinolates are a class of sulphur-containing plant compounds with diverse biological properties. They have been found exclusively in the Brassicaceae family plants and studied exhaustively in biosynthetic and application perspectives. The aim of this current study is to present a simple and updated method to quantify indole glucosinolate content in hairy root cultures of Chinese cabbage by HPLC-DAD-UV/Vis. Method validation controls were performed and recovery experiments were assayed. The data was statically treated and compared with published works...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28680445/validation-of-a-liquid-chromatography-tandem-mass-spectrometric-assay-for-quantitative-analysis-of-lenvatinib-in-human-plasma
#5
Tomoko Ogawa-Morita, Yoshiyuki Sano, Tomoka Okano, Hirofumi Fujii, Makoto Tahara, Masakazu Yamaguchi, Hironobu Minami
Toward conducting clinical pharmacokinetic studies of an antineoplastic agent, lenvatinib, we developed a liquid chromatography-tandem mass spectrometric assay for its quantitative analysis in human plasma. Analyte (lenvatinib) and internal standard (IS, propranolol) in the plasma were extracted by using acetonitrile and chromatographically separated by using a XTerra MS C18 column with 0.2 mL/min flow and mobile phase starting with 0.1% formic acid in water, followed by increasing percentage of acetonitrile...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28630627/changes-in-polyphenols-contents-and-antioxidant-capacities-of-organically-and-conventionally-cultivated-tomato-solanum-lycopersicum-l-fruits-during-ripening
#6
Dea Anton, Ingrid Bender, Tanel Kaart, Mati Roasto, Marina Heinonen, Anne Luik, Tõnu Püssa
Polyphenols of fruits and vegetables form an important part of human dietary compounds. Relatively little is known about accumulation of phenolics during fruits ripening process. The goal of this work was to study the changes in antioxidant activity and in content of 30 polyphenols during ripening of tomato fruits. Five organically and conventionally grown tomato cultivars were investigated at three different ripening stages. Phenolic compounds were extracted with methanol and extracts were analyzed by HPLC-DAD-MS/MS...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28630626/rapid-and-selective-determination-of-folate-receptor-%C3%AE-with-sensitive-resonance-rayleigh-scattering-signal
#7
Liping Wu, Yue Liu, Rong Huang, Huawen Zhao, Weiqun Shu
A rapid, simple, and novel method for folate receptor α (FRα) determination is reported here. A probe of gold nanoparticles (Au NPs) modified with anti-FRα antibody was synthesized under the optimized conditions first. The antibody-modified Au NPs would aggregate when FRα was added to the probe for the specific interaction between antibody and antigen, resulting in the enhancement of resonance Rayleigh scattering (RRS) intensity. There is a linear relationship between the change of RRS intensity (ΔIRRS) and the concentration of FRα, with the detecting range of 0...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28630625/quantification-of-antioxidant-phenolic-compounds-in-a-new-chrysanthemum-cultivar-by-high-performance-liquid-chromatography-with-diode-array-detection-and-electrospray-ionization-mass-spectrometry
#8
Ah-Reum Han, Hyo Young Kim, Yangkang So, Bomi Nam, Ik-Soo Lee, Joo-Won Nam, Yeong Deuk Jo, Sang Hoon Kim, Jin-Baek Kim, Si-Yong Kang, Chang Hyun Jin
The flowers of Chrysanthemum morifolium Ramat. have been used as an herbal tea and in traditional medicine, and the plant has been developed to produce horticultural cultivars of various colors and shapes. In this study, a new chrysanthemum cultivar with dark purple petals (C. morifolium cv. ARTI-Dark Chocolate; ADC) was developed by radiation-induced mutation breeding of its original cultivar with purple striped white petals (C. morifolium cv. Noble Wine, NW). The phenolic profile and antioxidant property of ADC were investigated and compared with NW and the commercially available medicinal herb, C...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28607557/the-adsorption-of-pb-zn-cu-ni-and-cd-by-modified-ligand-in-a-single-component-aqueous-solution-equilibrium-kinetic-thermodynamic-and-desorption-studies
#9
E Igberase, P Osifo, A Ofomaja
In this investigation, an amino functionalized adsorbent was developed by grafting 4-aminobenzoic acid onto the backbone of cross-linked chitosan beads. The 3 sets of beads including chitosan (CX), glutaraldehyde cross-linked chitosan (CCX), and 4-aminobenzoic acid grafted cross-linked chitosan (FGCX) were characterized by FTIR, XRD, SEM, and TGA. The water content and amine concentration of FGCX were determined. The effect of adsorption parameters was studied and the optimum was used for further studies. Equilibrium data was obtained from the adsorption experiment carried out at different initial concentration; the data were applied in isotherm, thermodynamics, and kinetic studies...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28592971/formulation-development-of-high-strength-gel-system-and-evaluation-on-profile-control-performance-for-high-salinity-and-low-permeability-fractured-reservoir
#10
Chengli Zhang, Guodong Qu, Guoliang Song
For the large pores and cracks of reservoirs with low temperatures, high salinity, and low permeability, a new type of high strength gel ABP system is developed in this paper. The defects of conventional gels such as weak gel strength, no gelling, and easy dehydration are overcome under the conditions of low temperature and high salinity. The temperature and salt resistance, plugging characteristics, and EOR of the gel system are studied. Under the condition of 32°C and 29500 mg/L salinity, the ABP system formulation is for 0...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28584526/analyses-of-mineral-content-and-heavy-metal-of-honey-samples-from-south-and-east-region-of-turkey-by-using-icp-ms
#11
Serap Kılıç Altun, Hikmet Dinç, Nilgün Paksoy, Füsun Karaçal Temamoğulları, Mehmet Savrunlu
The substantial of mineral ingredients in honey may symbolize the existence of elements in the plants and soil of the vicinity wherein the honey was taken. The aim of this study was to detect the levels of 13 elements (Potassium (K), Sodium (Na), Calcium (Ca), Iron (Fe), Zinc (Zn), Cadmium (Cd), Copper (Cu), Manganese (Mn), Lead (Pb), Nickel (Ni), Chromium (Cr), Aluminum (Al), and Selenium (Se)) in unifloral and multifloral honey samples from south and east regions of Turkey. Survey of 71 honey samples from seven different herbal origins, picked up from the south and east region of Turkey, was carried out to determine their mineral contents during 2015-2016...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28567056/rapid-determination-of-isomeric-benzoylpaeoniflorin-and-benzoylalbiflorin-in-rat-plasma-by-lc-ms-ms-method
#12
Chuanqi Zhou, Xiaoke Wang
Benzoylpaeoniflorin (BP) is a potential therapeutic agent against oxidative stress related Alzheimer's disease. In this study, a more rapid, selective, and sensitive liquid chromatography-tandem mass spectrometric (LC-MS/MS) method was developed to determine BP in rat plasma distinguishing with a monoterpene isomer, benzoylalbiflorin (BA). The method showed a linear response from 1 to 1000 ng/mL (r > 0.9950). The precision of the interday and intraday ranged from 2.03 to 12.48% and the accuracy values ranged from -8...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28553353/new-modified-uplc-tandem-mass-spectrometry-method-for-determination-of-risperidone-and-its-active-metabolite-9-hydroxyrisperidone-in-plasma-application-to-dose-dependent-pharmacokinetic-study-in-sprague-dawley-rats
#13
Essam Ezzeldin, Marwa Tammam, Nisreen F Abo Talib
Sensitive and specific liquid-chromatography tandem mass spectrometry (UPLC-MS/MS) assay has been developed and validated for simultaneous quantification of risperidone (RIS) and its active metabolite 9-hydroxyrisperidone (9-OH-RIS) in rat plasma using olanzapine (OLA) as internal standard (IS). Pharmacokinetics of risperidone and its active metabolite 9-hydroxyrisperidone was compared across different doses (0.3, 1.0, and 6.0 mg/kg). Serial blood sample was collected over a time of 48 hours and analyzed for risperidone and its active metabolite 9-hydroxyrisperidone...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28487740/analyses-of-ferrous-and-ferric-state-in-dynabitab-using-m%C3%A3-ssbauer-spectroscopy
#14
Young Rang Uhm, Jae Cheong Lim, Sang Mu Choi
Antianemic medicament ferrous gluconate, ferrous fumarate, and a Dynabi tablet with a basic iron bearing ingredient were studied with the use of Mössbauer spectroscopy. Room temperature spectra of ferrous gluconate gave clear evidence that the two phases of iron were present: ferrous (Fe(2+)) as a major one with a contribution at and above 91 a.u.% and ferric (Fe(3+)) whose contribution was found to be ~9 a.u.%. In the case of ferrous fumarate, a single phase was measured corresponding to ferrous (Fe(2+)) state...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28473855/simultaneous-determination-of-preservatives-in-dairy-products-by-hplc-and-chemometric-analysis
#15
Fatemeh Zamani Mazdeh, Sima Sasanfar, Anita Chalipour, Elham Pirhadi, Ghazal Yahyapour, Armin Mohammadi, Akram Rostami, Mohsen Amini, Mannan Hajimahmoodi
Cheese and yogurt are two kinds of nutritious dairy products that are used worldwide. The major preservatives in dairy products are sodium benzoate, potassium sorbate, and natamycin. The maximum permitted levels for these additives in cheese and yogurt are established according to Iranian national standards. In this study, we developed a method to detect these preservatives in dairy products by reversed phase chromatography with UV detection in 220 nm, simultaneously. This method was performed on C18 column with ammonium acetate buffer (pH = 5) and acetonitrile (73 : 27 v/v) as mobile phase...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28408929/detection-of-cu-2-in-water-based-on-histidine-gold-labeled-multiwalled-carbon-nanotube-electrochemical-sensor
#16
Rilong Zhu, Gangqiang Zhou, Fengxia Tang, Chunyi Tong, Yeyao Wang, Jinsheng Wang
Based on the strong interaction between histidine and copper ions and the signal enhancement effect of gold-labeling carbon nanotubes, an electrochemical sensor is established and used to measure copper ions in river water. In this study the results show that the concentrations of copper ion have well linear relationship with the peak current in the range of 10(-11)-10(-7 )mol/L, and the limit of detection is 10(-12 )mol/L. When using this method to detect copper ions in the Xiangjiang River, the test results are consistent with the atomic absorption method...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28367216/gc-method-validation-for-the-analysis-of-menthol-in-suppository-pharmaceutical-dosage-form
#17
Murad N Abualhasan, Abdel Naser Zaid, Nidal Jaradat, Ayman Mousa
Menthol is widely used as a fragrance and flavor in the food and cosmetic industries. It is also used in the medical and pharmaceutical fields for its various biological effects. Gas chromatography (GC) is considered to be a sensitive method for the analysis of menthol. GC chromatographic separation was developed using capillary column (VF-624) and a flame ionization detector (FID). The method was validated as per ICH guidelines for various parameters such as precision, linearity, accuracy, solution stability, robustness, limit of detection, and quantification...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28316627/green-synthesis-and-characterization-of-silver-nanoparticles-using-citrullus-lanatus-fruit-rind-extract
#18
Michael Ndikau, Naumih M Noah, Dickson M Andala, Eric Masika
The wide-scale application of silver nanoparticles (AgNPs) in areas such as chemical sensing, nanomedicine, and electronics has led to their increased demand. Current methods of AgNPs synthesis involve the use of hazardous reagents and toxic solvents. There is a need for the development of new methods of synthesizing AgNPs that use environmentally safe reagents and solvents. This work reports a green method where silver nanoparticles (AgNPs) were synthesized using silver nitrate and the aqueous extract of Citrullus lanatus fruit rind as the reductant and the capping agent...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28316626/evaluation-of-phenolic-compounds-and-antioxidant-and-antimicrobial-activities-of-some-common-herbs
#19
Muhammad Abdul Qadir, Syeda Kiran Shahzadi, Asad Bashir, Adil Munir, Shabnam Shahzad
The study was designed to evaluate the phenolic, flavonoid contents and antioxidant and antimicrobial activities of onion (Allium cepa), garlic (Allium sativum), mint (Mentha spicata), thyme (Thymus vulgaris), oak (Quercus), aloe vera (Aloe barbadensis Miller), and ginger (Zingiber officinale). All extracts showed a wide range of total phenolic contents, that is, 4.96 to 98.37 mg/100 g gallic acid equivalents, and total flavonoid contents, that is, 0.41 to 17.64 mg/100 g catechin equivalents. Antioxidant activity (AA) was determined by measuring reducing power, inhibition of peroxidation using linoleic acid system, and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) scavenging activity...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28298926/identification-and-quantification-of-glucosinolates-in-kimchi-by-liquid-chromatography-electrospray-tandem-mass-spectrometry
#20
Ho Jin Kim, Mi Jin Lee, Min Hee Jeong, Jang Eok Kim
A novel and simple method for detecting five glucosinolates (glucoalyssin, gluconapin, glucobrassicanapin, glucobrassicin, and 4-methoxyglucobrassicin) in kimchi was developed using liquid chromatography-electrospray tandem mass spectrometry (LC-MS/MS). The chromatographic peaks of the five glucosinolates were successfully identified by comparing their retention times, mass spectra. The mobile phase was composed of A (acetonitrile) and B (water). As for glucosinolate, the relative quantities were found through sinigrin, and five different compounds that have not been previously discovered in kimchi were observed...
2017: International Journal of Analytical Chemistry
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