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https://www.readbyqxmd.com/read/29669397/direct-detection-of-the-psychoactive-substance-mt-45-in-human-tissue-samples-by-probe-electrospray-ionization-tandem-mass-spectrometry
#1
Kiyotaka Usui, Tasuku Murata, Yuji Fujita, Yoshito Kamijo, Tomoki Hanazawa, Tomohiro Yoshizawa, Masato Funayama
Analyses of drugs and poisons in tissue samples are essential in forensic toxicology and pharmacology. However, current procedures for tissue analysis are laborious and time-consuming. Therefore, we assessed the utility of a newly devised probe electrospray ionization (PESI) technique with tandem mass spectrometry (MS/MS) for easy, ultra-rapid drug detection in human tissue samples. Using this system, typical pre-treatment procedures, such as solid-phase extraction, liquid-liquid extraction, deproteinization, or homogenization, can be avoided...
April 18, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29643307/quantification-of-trans-resveratrol-in-red-wines-using-quechers-extraction-combined-with-liquid-chromatography-tandem-mass-spectrometry
#2
Shih-Chieh Lu, Wan-Rou Liao, Sung-Fang Chen
Resveratrol is one of representative ingredient in red wine, but its quantification is a challenge because of a complex and abundant matrix. In this study, two sample pretreatments, direct dilution and QuEChERS extraction, coupling LCMS analysis were examined for resveratrol quantification. Similar recoveries of 106.4 to 93.7% were obtained for direct dilution and QuEChERS, respectively. With the aid of condition optimization, QuEChERS extraction could concentrate the resveratrol from red wines to improve the detection sensitivity with a LOD value of 2...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29622229/gas-chromatography-mass-spectrometry-determination-of-polycyclic-aromatic-hydrocarbons-in-baby-food-using-quechers-combined-with-low-density-solvent-dispersive-liquid-liquid-microextraction
#3
Mateus Henrique Petrarca, Helena Teixeira Godoy
A sensitive GC-MS method is reported for the determination of twelve polycyclic aromatic hydrocarbons (PAHs) in baby food. The sample preparation involves QuEChERS extraction combined with low-density solvent dispersive liquid-liquid microextraction (LDS-DLLME) and ultra-low temperature (-80 °C). Plackett-Burman screening design was employed to identify the main sample preparation variables that affect the extraction efficiency, such as the volume of toluene used in LDS-DLLME. The suitability of proposed method was verified by analytical selectivity, linearity in solvent and matrix-matched calibration curves and adequate recoveries (72-112%) and precision (RSD values ≤11%), under repeatability and within-laboratory reproducibility conditions...
August 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29621408/review-of-sample-preparation-techniques-for-the-analysis-of-selected-classes-of-pesticides-in-plant-matrices
#4
Hanna Barchanska, Magdalena Danek, Marcin Sajdak, Marian Turek
The aim of this article is to present the trends in extraction techniques applied for the isolation of pesticides from plant matrix. To fully compare the effectiveness of different extraction techniques, it was required to analyze compounds with possibly wide spectrum of physicochemical properties. Hence, compounds representing neonicotinoids, pyrethroids, sulfonylureas and phenylamides were selected. Based on literature studies, it may be concluded that there are three main approaches to make the analytical procedures for pesticides determination more effective: (i) the optimization of extraction conditions, however, according to ANOVA conducted on the collected literature data, not all parameters influence the extraction process equally; chemometric studies based on literature reports may lead to the conclusion that the most favorable conditions (criterion: analyte recovery, repeatability) for neonicotinoid, pyrethroid and sulfonylurea herbicide extraction from plant tissues are provided by QuEChERS - extraction with acetonitrile, while the mixtures of PSA and GCB (for neonicotinoids), and PSA, GCB, C18 (for pyrethroids) should be used in d-SPE step...
April 5, 2018: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/29602949/matrix-effect-evaluation-and-method-validation-of-azoxystrobin-and-difenoconazole-residues-in-red-flesh-dragon-fruit-hylocereus-polyrhizus-matrices-using-quechers-sample-preparation-methods-followed-by-lc-ms-ms-determination
#5
Sri Noegrohati, Elan Hernadi, Syanti Asviastuti
Production of red flesh dragon fruit (Hylocereus polyrhizus) was hampered by Colletotrichum sp. Pre-harvest application of azoxystrobin and difenoconazole mixture is recommended, therefore, a selective and sensitive multi residues analytical method is required in monitoring and evaluating the commodity's safety. LC-MS/MS is a well-established analytical technique for qualitative and quantitative determination in complex matrices. However, this method is hurdled by co-eluted coextractives interferences. This work evaluated the pH effect of acetate buffered and citrate buffered QuEChERS sample preparation in their effectiveness of matrix effect reduction...
March 30, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29602055/optimization-of-a-modified-quechers-method-for-the-determination-of-tetracyclines-in-fish-muscle-by-uhplc-ms-ms
#6
Ángel Grande-Martínez, David Moreno-González, Francisco J Arrebola-Liébanas, Antonia Garrido-Frenich, Ana M García-Campaña
In this work a sample treatment based on a modified QuEChERS method combined with ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was proposed to determine the residues of five common tetracyclines in fish muscle samples. The separation was achieved in less than 4 min and the analytes were detected in electrospray ionization in positive mode (ESI+) with multiple reaction monitoring mode. Parameters affecting the extraction step, such as the amount of sample and EDTA-McIlvaine buffer and extraction solvent volumes, were optimized by means of experimental design...
March 20, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29582608/-determination-of-myclobutanil-and-difenoconazole-residues-in-pollen-and-honey-of-litchi-by-high-performance-liquid-chromatography-tandem-mass-spectrometry
#7
Siwei Wang, Yanping Liu, Haibin Sun, Lanjuan DU, Nengli Xu
An effective method was developed for the determination of two major fungicides including myclobutanil and difenoconazole residues in pollen and honey of litchi by modified QuEChERS-high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The pollen and honey samples were all extracted by acetonitrile, the pollen samples were cleaned-up by 0.9 g anhydrous magnesium sulfate (MgSO4 ), 0.15 g primary secondary amine (PSA) and 0.15 g C18 ; the honey samples were cleaned-up by 0.9 g MgSO4 and 0...
January 8, 2018: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29579974/determination-of-four-alternaria-alternata-mycotoxins-by-quechers-approach-coupled-with-liquid-chromatography-tandem-mass-spectrometry-in-tomato-based-and-fruit-based-products
#8
Sara De Berardis, Eleonora Laura De Paola, Giuseppe Montevecchi, Davide Garbini, Francesca Masino, Andrea Antonelli, Dora Melucci
A liquid chromatography-tandem mass spectrometry method for the determination of four Alternaria toxins, i.e. alternariol, alternariol monomethyl ether, tentoxin, and tenuazonic acid in tomato-based and fruit-based products was developed using a QuEChERs approach for the extraction of the mycotoxins. To optimise the QuEChERs extraction, several parameters were tested: types of QuEChERs pouches, sample weights, quantities of added water, use of dispersive SPE as a purification step, types of solvent and conditions of shaking...
April 2018: Food Research International
https://www.readbyqxmd.com/read/29577291/validation-of-a-quechers-based-gas-chromatography-mass-spectrometry-gc-ms-method-for-analysis-of-phthalate-esters-in-grain-sorghum
#9
Xiaotao Sun, Wei Dong, Miao Liu, Caihong Shen, Yuyu Zhang, Jinyuan Sun, Baoguo Sun, Hehe Li, Feng Chen
A modified QuEChERS method coupled with gas chromatography-mass spectrometry (GC-MS) was developed for analysis of 14 phthalate esters (PAEs) in grain sorghum (GS). Chemical extraction was done with acetonitrile followed by dispersive-solid phase extraction technique with a mixture of sorbents including primary secondary amine and octadecyl silica. Under the optimized condition, the matrix-matched calibration curves for all PAEs showed good linear relationship in the concentration range between 5 and 500 μg/L with correlation coefficients (R2 ) better than 0...
March 25, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29574560/in-house-validation-of-a-rapid-and-efficient-procedure-for-simultaneous-determination-of-ergot-alkaloids-and-other-mycotoxins-in-wheat-and-maize
#10
Natalia Arroyo-Manzanares, Karl De Ruyck, Valdet Uka, Laura Gámiz-Gracia, Ana M García-Campaña, Sarah De Saeger, José Diana Di Mavungu
A fundamental step in addressing the global problem of mycotoxins is the development of highly sensitive, multi-class extraction and detection methods. This constitutes a field of research that has in recent years enjoyed a steady advance. Such methods, generally based on liquid chromatography coupled to mass spectrometry, are widely reported successfully detecting various mycotoxins in different food and feed samples. In this work, an innovative approach to multi-class mycotoxin control is proposed, offering specific advantages: a broader inclusion of more mycotoxin classes, robust and thorough extraction for all target compounds despite their varied chemical properties, and determination of all analytes from a single injection...
March 24, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29567233/modified-quechers-method-for-24-plant-growth-regulators-in-grapes-using-lc-ms-ms
#11
Chieh-Han Pu, Shao-Kai Lin, Wei-Chen Chuang, Tsyr-Horng Shyu
A multiresidue analytical method was developed for grapes for the following 24 plant growth regulators: 1-naphthylacetamide, 2,3,5-triiodobenzoic acid, 2,4,5-T, 2-naphthoxyacetic acid, 3-indolylacetic acid, 4-(3-indolyl)-butyric acid, 4-chlorophenoxyacetic acid, 4-nitrophenol, 6-benzylaminopurine, N6-isopentenyladenine, butralin, chlormequat chloride, chlorphonim-Cl, cloprop, forchlorfenuron, gibberellic acid 3, gibberellic acid 4, gibberellic acid 7, inabenfide, mepiquat chloride, paclobutrazol, prohydrojasmon, thidiazuron and uniconizole-P...
April 2018: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/29558416/a-quechers-based-liquid-chromatography-tandem-mass-spectrometry-method-for-the-simultaneous-determination-of-nine-zearalenone-like-mycotoxins-in-pigs
#12
Zheng Yan, Lan Wang, Jun Wang, Yanglan Tan, Dianzhen Yu, Xiaojiao Chang, Yingying Fan, Duoyong Zhao, Cheng Wang, Marthe De Boevre, Sarah De Saeger, Changpo Sun, Aibo Wu
The determination of zearalenone (ZEN) and its derivatives as biomarkers in animal tissues or organs plays an important role in mycotoxin monitoring and can promote effective exposure assessment. A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the simultaneous quantification of nine ZEN-like mycotoxins, including three glucuronides in different pig tissues (heart, liver, spleen and muscle) was developed and validated in this study. Tissue samples were extracted using a quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction and clean-up procedure, and analyzed by LC-MS/MS in multiple reaction monitoring (MRM) mode...
March 20, 2018: Toxins
https://www.readbyqxmd.com/read/29556798/validation-of-quechers-analytical-technique-for-organochlorines-and-synthetic-pyrethroids-in-fruits-and-vegetables-using-gc-ecd
#13
J K Dubey, S K Patyal, Ajay Sharma
In the present day scenario of increasing awareness and concern about the pesticides, it is very important to ensure the quality of data being generated in pesticide residue analysis. To impart confidence in the products, terms like quality assurance and quality control are used as an integral part of quality management. In order to ensure better quality of results in pesticide residue analysis, validation of analytical methods to be used is extremely important. Keeping in view the importance of validation of method, the validation of QuEChERS (quick, easy, cheap, effective, rugged, and safe) a multiresidue method for extraction of 13 organochlorines and seven synthetic pyrethroids in fruits and vegetables followed by GC ECD for quantification was done so as to use this method for analysis of samples received in the laboratory...
March 19, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29555360/development-of-a-partitioned-liquid-liquid-extraction-dispersive-solid-phase-extraction-procedure-followed-by-liquid-chromatography-tandem-mass-spectrometry-for-analysis-of-3-monochloropropane-1-2-diol-diesters-in-edible-oils
#14
J A Custodio-Mendoza, R A Lorenzo, I M Valente, P J Almeida, M A Lage, J A Rodrigues, A M Carro
A fast and effective method using a modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) approach which includes partitioned liquid-liquid extraction (PLLE) and dispersive solid phase extraction (dSPE) clean-up step for the determination of seven 3-monochloropropane-1,2-diol (3-MCPD) fatty acid diesters in vegetable oils is developed and validated according to the Food and Drug Administration (FDA) guidelines. Due to the complexity of the matrices, combination of silica based sorbents (Silica Strong Anion Exchange (Si-SAX), Supel™ QuE Z-Sep+ (Z-Sep+) and Primary Secondary Amine (PSA) were tested for lipid removal...
March 13, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29536730/validation-of-a-multiresidue-analysis-method-for-379-pesticides-in-human-serum-using-liquid-chromatography-tandem-mass-spectrometry
#15
Yongho Shin, Jonghwa Lee, Ji-Ho Lee, Junghak Lee, Eunhye Kim, Kwang-Hyeon Liu, Hye Suk Lee, Jeong-Han Kim
A screening method for simultaneous analysis of 379 pesticides in human serum was developed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Electrospray ionization with positive/negative switching mode of LC-MS/MS was adopted and scheduled multiple reaction monitoring for each target compound was established. The limit of quantitation was 10 ng/mL for 94.5% of the total pesticides and the correlation coefficients of calibration were ≥0.990 for 93.9% of the pesticides. For the sample preparation, scaled-down QuEChERS were used...
March 14, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29526092/an-improved-analytical-method-for-determination-of-cholesterol-oxidation-products-in-meat-and-animal-fat-by-quechers-coupled-with-gas-chromatography-mass-spectrometry
#16
Che-Wei Chiu, Tsai Hua Kao, Bing Huei Chen
Cholesterol, widely present in animal fats and meat products, can undergo oxidation to form cholesterol oxidation products (COPs) during heating. The objectives of this study were to develop a QuEChERS method for reduction of solvent volume and extraction time for determination of COPs in edible animal fats and meat products by gas chromatography-mass spectrometry. By employing a DB-5MS capillary column (30 m x 0.25 mm I.D., film thickness 0.25 mm) and a temperature programming method, 7 COPs, cholesterol and internal standard 5α-cholestane could be separated within 19 min...
March 10, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29525867/trace-analysis-of-parabens-preservatives-in-drinking-water-treatment-sludge-treated-and-mineral-water-samples
#17
Ana Victoria Marta-Sanchez, Sergiane Souza Caldas, Antunielle Schneider, Sónia Maria Vaz Sanches Cardoso, Ednei Gilberto Primel
Parabens have been widely used as antimicrobial agents, mainly in food products, pharmaceuticals, and cosmetics. Although they are known as safe preservatives, they also cause some harm to human health, which has been discussed lately. Therefore, the aim of this study was to evaluate the occurrence of nine parabens (including isomers) in mineral and drinking waters, besides in drinking water treatment sludge (DWTS) samples with determination by liquid chromatography tandem mass spectrometry (LC-MS/MS). Both methods solid phase extraction (SPE) and QuEChERS were validated...
March 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29525126/quechers-and-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-method-for-the-determination-of-parabens-and-ultraviolet-filters-in-human-milk-samples
#18
F Vela-Soria, L M Iribarne-Durán, V Mustieles, I Jiménez-Díaz, M F Fernández, N Olea
Concerns are growing about human exposure to endocrine disrupting chemicals (EDCs), especially during developmental stages. Parabens (PBs) and ultraviolet filters (UVFs) are prevalent EDCs widely used as additives in cosmetics and personal care products (PCPs). The objective of this study was to develop a method to determine four PBs and ten UVFs in human milk using QuEChERS treatment and ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). Multivariate strategies were applied to optimize experimental parameters...
March 6, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29523941/development-and-in-house-validation-of-a-rapid-and-simple-to-use-elisa-for-the-detection-and-measurement-of-the-mycotoxin-sterigmatocystin
#19
Michalina Oplatowska-Stachowiak, Claudine Reiring, Nermin Sajic, Willem Haasnoot, Catherine Brabet, Katrina Campbell, Christopher T Elliott, Martin Salden
Sterigmatocystin (STG) is a highly toxic secondary fungal metabolite structurally closely related to the well-known carcinogenic aflatoxins. Its presence has been reported in grains and grain-based products as well as in other foodstuffs like nuts, green coffee beans, spices, beer and cheese. Due to the lack of suitable data on the occurrence of STG, in 2013, the European Food Safety Authority (EFSA) could not characterise its risk for human health and recommended that more data on STG in food and feed needed to be collected...
March 9, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29523939/determination-of-phthalic-acid-esters-in-different-baby-food-samples-by-gas-chromatography-tandem-mass-spectrometry
#20
Bárbara Socas-Rodríguez, Javier González-Sálamo, Antonio V Herrera-Herrera, Álvaro Santana-Mayor, Javier Hernández-Borges
In this work, a new method has been developed for the determination of 14 phthalic acid esters (i.e., benzylbutyl phthalate (BBP), bis-2-n-butoxyethyl phthalate (DBEP), dibutyl phthalate (DBP), dicyclohexyl phthalate (DCHP), bis-2-ethoxyethyl phthalate (DEEP), diethyl phthalate (DEP), diisodecyl phthalate (DIDP), diisononyl phthalate (DINP), bis-isopentyl phthalate (DIPP), bis (2-methoxyethyl) phthalate (DMEP), dimethyl phthalate (DMP), di-n-octyl phthalate (DNOP), bis-n-pentyl phthalate (DNPP), dipropyl phthalate (DPP)) and one adipate (bis (2-ethylhexyl) adipate (DEHA)) in different baby foods...
March 9, 2018: Analytical and Bioanalytical Chemistry
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