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https://www.readbyqxmd.com/read/29920090/trace-level-analysis-of-sarin-and-vx-in-food-using-normal-phase-silica-gel-and-ultra-performance-liquid-chromatography-time-of-flight-mass-spectrometry-uplc-tof-ms
#1
Su Y Bae, Mark D Winemiller
Ultra-performance liquid chromatography/electrospray ionization mass spectrometry was used for the trace level determination of isopropyl methylphosphonofluoridate (Sarin, GB) and (O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothioate (VX) after extraction from various foods. A method utilizing normal phase silica gel was developed for the sample preparation and extraction of VX and GB from food. The extraction efficiencies of the normal phase silica gel method for VX was compared to those of other commercial solid phase extraction media and was found to be comparable...
June 19, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29914055/evaluation-of-mycotoxin-residues-on-ready-to-eat-food-by-chromatographic-methods-coupled-to-mass-spectrometry-in-tandem
#2
Dionisia Carballo, Guillermina Font, Emilia Ferrer, Houda Berrada
Simultaneous determination of twenty-seven mycotoxins in ready-to-eat food samples using “Quick Easy Cheap Rough and Safe” (QuEChERS) extraction and chromatographic methods coupled to mass spectrometry in tandem is described in this study. Mycotoxins included in this survey were aflatoxins (B₁, B₂, G₁, G₂), enniatins (A, A₁, B, B₁), beauvericin (BEA), fumonisins (FB₁, FB₂), sterigmatocystin (STG), deoxynivalenol (DON), 3-acetyl-deoxynivalenol (3-ADON), 15-acetyl-deoxynivalenol (15-ADON), nivalenol (NIV), neosolaniol (NEO), diacetoxyscirpenol (DAS), fusarenon-X (FUS-X), zearalenone (ZEA), α-zearalanol (αZAL), β-zearalenone (βZAL), α-zearalenol (αZOL), β-zearalenol (βzol), T2, and HT-2 toxin...
June 15, 2018: Toxins
https://www.readbyqxmd.com/read/29909756/phosphodiesterase-5-inhibitors-in-chinese-tonic-liquors-by-liquid-chromatography-coupled-with-quadrupole-time-of-flight-mass-spectrometry
#3
Bo Ding, Zhiyuan Wang, Jianjun Xie, Guangfeng Zeng, Wenrui Chen
Chinese tonic liquor is an important dietary supplement in daily use, but it often happens that illicitly adulterated drugs in Chinese tonic liquor could lead to food safety issues. In this survey an analytical method consisting of a liquid chromatography quadrupole time of flight mass spectrometer (LC-Q-TOF-MS), coupled with QuEChERS pretreatment, was established for identification of phosphodiesterase type 5 enzyme (PDE-5) inhibitors in Chinese tonic liquors. 86 PDE-5 inhibitors were qualitatively analyzed by employing information dependent acquisition mass spectrometry (IDA-MS) in comparison with the accurate mass of the protonated molecular ion, isotopic pattern, library and chemical formula...
June 18, 2018: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/29908453/residue-behaviors-and-risk-assessment-of-flonicamid-and-its-metabolites-in-the-cabbage-field-ecosystem
#4
Shanshan Wang, Fen Jin, Xiaolin Cao, Yong Shao, Jian Wang, Yongxin She, Yan Qi, Chao Zhang, Hui Li, Maojun Jin, Jing Wang, Hua Shao, Lufei Zheng
Flonicamid, a novel selective systemic pesticide, can effectively control a broad range of insect pests. However, the dissipation behaviors and the terminal residues of flonicamid and its metabolites in some crops and soils remain unclear. Herein, an easy, sensitive and reliable method using a modified QuEChERS extraction coupled with LC-MS/MS for the simultaneous analysis of flonicamid and its metabolites in cabbage and soil was developed. Based on this method, the dissipation behaviors of flonicamid and its metabolites as well as their persistence in cabbage and soil during harvest were investigated...
June 13, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29883891/application-of-dispersive-solid-phase-extraction-for-trace-analysis-of-toxic-chemicals-in-foods
#5
Sarah Neely, Jordan Martin, Natalia Ferreira da Cruz, Gavin Piester, Morgan Robinson, Richard Okoniewski, Buu N Tran
The objectives of this study were to develop and validate a method for the identification of toxic organic chemicals, including groups of controlled substances, alkaloids and pesticides that are highly toxic and considered threats to public health. This project aims to ensure our laboratory's readiness to respond to emergencies involving our food supply in cooperation with the Food Emergency Response Network (FERN) program. The food matrices were homogenized in a blender or food processor prior to extraction with an acetonitrile-water mixture using a QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) procedure...
May 29, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29881415/the-effects-of-house-cooking-process-on-residue-concentrations-of-41-multi-class-pesticides-in-rice
#6
Attaollah Shakoori, Hassan Yazdanpanah, Farzad Kobarfard, Mohammad Hossein Shojaee, Jamshid Salamzadeh
In current study, the effects of Iranian rice cooking method (Kateh) on residue levels of 41 pesticides were investigated. The pesticides were selected according to Iranian National Standards Organization (INSO) regulations and covered 18 permitted and 23 banned pesticides belonging to different chemical classes such as organophosphate, triazole, and carbamate. A 250 g portion of rice sample was soaked in 2.5 L spiked tap water containing studied pesticides at final concentration 2 μg/mL and then, the effects of washing and cooking were investigated...
2018: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29874915/validation-of-an-analytical-method-for-the-determination-of-pesticide-residues-in-vine-leaves-by-gc-ms-ms
#7
Britt Maestroni, Amer Abu Alnaser, Iyad Ghanem, Marivil Dabalus Islam, Veronica Cesio, Horacio Heinzen, Simon Kelly, Andrew Cannavan
A modified and miniaturized SweEt / QuEChERS method for pesticide residue analysis applied to vine leaves is presented. The deep-frozen plant material was cryogenically processed. A 2 g analytical portion was hydrated for 30 min and extracted with acidified ethyl acetate after buffering with NaHCO3 and adding Na2SO4. A dispersive solid-phase (d-SPE) clean-up step with primary-secondary amine (PSA) was performed. The pesticide residues were determined using GC-MS/MS. The whole procedure was validated for 54-59 pesticides at 0...
June 7, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29862430/development-of-a-method-for-the-simultaneous-determination-of-multi-class-pesticides-in-earthworms-by-liquid-chromatography-coupled-to-tandem-electrospray-mass-spectrometry
#8
Gaëlle Daniele, Florent Lafay, Céline Pelosi, Clémentine Fritsch, Emmanuelle Vulliet
Agricultural intensification, and in particular the use of pesticides, leads over the years to a loss of biodiversity and a decline of ecosystem services in cultivated zones and agricultural landscapes. Among the animal communities involved in the functioning of agro-ecosystems, earthworms are ubiquitous and recognized as indicators of land uses and cultural practices. However, little data is available on the levels of pesticides in such organisms in natura, which would allow estimating their actual exposure and the potentially resulting impacts...
June 4, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29861305/development-and-validation-of-a-quechers-method-for-the-analysis-of-5-nitroimidazole-traces-in-infant-milk-based-samples-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#9
Maykel Hernández-Mesa, Ana M García-Campaña, Carmen Cruces-Blanco
QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) methodology in combination with UHPLC-MS/MS is proposed for the determination of 5-nitroimidazole (5-NDZ) residues in infant milk-based products. Chromatographic separation was accomplished in a C18 Zorbax Eclipse Plus RRHD (50 × 2.1 mm, 1.8 μm) column under gradient elution conditions. Mobile phase consisted of 0.025% (v/v) aqueous formic acid (eluent A) and MeOH (eluent B), and was supplied at a flow rate of 0.5 mL/min. Under these conditions, eleven 5-NDZs including three metabolites were separated in less than 4 min...
May 28, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29861303/multi-residue-pesticide-analysis-in-virgin-olive-oil-by-nanoflow-liquid-chromatography-high-resolution-mass-spectrometry
#10
David Moreno-González, Jaime Alcántara-Durán, Silvina M Addona, Miriam Beneito-Cambra
In this article, a nanoflow liquid chromatography system coupled to high resolution mass spectrometry (nanoflow LC/ESI Q-Orbitrap-MS) has been applied for the development of a multiresidue pesticide method for the determination of 162 multiclass pesticides in olive oil samples. Due to the relatively high lipid content of the raw QuEChERS acetonitrile extracts obtained from this type of fatty vegetable samples, a dispersive solid phase extraction (dSPE) sorbent proposed to retain both fatty acids and triglycerides, namely Enhanced Matrix Removal-Lipid (EMR-Lipid) has been implemented as additional cleanup step...
May 28, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29857566/detection-of-%C3%AE-lactams-and-chloramphenicol-residues-in-raw-milk-development-and-application-of-an-hplc-dad-method-in-comparison-with-microbial-inhibition-assays
#11
Eftychia Karageorgou, Sofia Christoforidou, Maria Ioannidou, Evdoxios Psomas, Georgios Samouris
The present study was carried out to assess the detection sensitivity of four microbial inhibition assays (MIAs) in comparison with the results obtained by the High Performance Liquid Chromatography with Diode-Array Detection (HPLC-DAD) method for antibiotics of the β-lactam group and chloramphenicol in fortified raw milk samples. MIAs presented fairly good results when detecting β-lactams, whereas none were able to detect chloramphenicol at or above the permissible limits. HPLC analysis revealed high recoveries of examined compounds, whereas all detection limits observed were lower than their respective maximum residue limits (MRL) values...
June 1, 2018: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/29852384/ractopamine-analysis-in-pig-kidney-liver-and-lungs-a-validation-of-the-method-scope-extension-using-quechers-as-a-sample-preparation-step
#12
Vivian Feddern, Carolina Naves Aroeira, Luciano Molognoni, Vanessa Gressler, Heitor Daguer, Osmar Antonio Dalla Costa, Carmen Josefina Contreras Castillo, Gustavo Julio Mello Monteiro de Lima
Ractopamine has been allowed by some countries as a repartitioning additive in pig diet, since it promotes protein synthesis and fat lipolysis. Most regulatory agencies only propose the ractopamine assessment in meat, kidney, liver and fat. Aiming at contributing to the scarcity data regarding this analyte in pig lungs, we extended the scope of a LC-MS method to evaluate pig offals. Homogenized tissue samples were extracted by a QuEChERS procedure; following by clean up steps and further tandem mass spectrometry determination...
May 23, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29843861/determination-of-eight-sulfonylurea-herbicide-residues-by-lc-ms-ms-using-a-sample-separation-technique-with-ethyl-acetate
#13
Eleftheria Bempelou, Petros Kappatos, Konstantinos Liapis
Background: Sulfonylureas are an important group of systemic herbicides mainly used for the control of weeds in cereals and other crops in early growth stages of their cultivations. Sulfonylureas are characterized by their broad spectrum weed control and their good crop selectivity. Objective: In the present study, the determination of eight sulfonylureas has been tested in wheat flour by applying the SweEt multiresidue method modified for dry products. Method: The method involves sample preparation with extraction with ethyl acetate (EEA) and determination of the analytes with LC/MS/MS-electrospray ionization...
May 29, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29843028/simultaneous-analysis-of-310-pesticide-multiresidues-using-uhplc-ms-ms-in-brown-rice-orange-and-spinach
#14
Jonghwa Lee, Yongho Shin, Junghak Lee, Jiho Lee, Byung Joon Kim, Jeong-Han Kim
In this study, we developed a multiresidue method for the analysis of 310 pesticides in representative agricultural produce (brown rice, orange, and spinach) using ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) combined with a modified QuEChERS procedure. The optimal mobile phase composition (Methanol containing 5 mM ammonium formate and 0.1% formic acid) produced high sensitivity and reliable results. Also, the relationship between injection volume and repeatability of peak area was investigated...
May 21, 2018: Chemosphere
https://www.readbyqxmd.com/read/29793201/positive-effects-of-an-oil-adjuvant-on-efficacy-dissipation-and-safety-of-pyrimethanil-and-boscalid-on-greenhouse-strawberry
#15
Zhiwei Wang, Xinquan Wang, Tao Cang, Xueping Zhao, Shenggan Wu, Peipei Qi, Xiangyun Wang, Xiahong Xu, Qiang Wang
Methylated vegetable oil adjuvants can enhance initial deposition and decrease the required dosages of pesticides sprayed on plants, so an oil adjuvant mixed with fungicides were used to prevent and control gray mold in greenhouse strawberry. As the persistence and dietary exposure risks from fungicides on strawberries after using adjuvants have not been assessed, the efficacy, dissipation and safety of pyrimethanil and boscalid in the presence and absence of a methylated vegetable oil adjuvant were evaluated...
May 21, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29792981/probabilistic-non-carcinogenic-and-carcinogenic-risk-assessments-monte-carlo-simulation-method-of-the-measured-acrylamide-content-in-tah-dig-using-quechers-extraction-and-uhplc-ms-ms
#16
Parvin Eslami Shahrbabki, Bahador Hajimohammadi, Shahram Shoeibi, Mehdi Elmi, Arash Yousefzadeh, Gea Oliveri Conti, Margherita Ferrante, Maryam Amirahmadi, Yadolah Fakhri, Amin Mousavi Khaneghah
A modified "Quick, Easy, Cheap, Effective, Rugged, and Safe" QuEChERS in combination with Ultra-High Performance Liquid Chromatography/tandem mass spectrometry (UHPLC-MS/MS) method was optimized for the determination of acrylamide content in different types of tah-dig (rice, bread, and potato). Also, the non-carcinogenic and carcinogenic risks (target hazard quotient (THQ) and incremental lifetime cancer risk (ILCR)) due to ingestion of acrylamide via tah-dig in the adults and children were assessed by Monte Carlo simulation (MCS) method...
May 21, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29787361/sorption-and-degradation-of-neonicotinoid-insecticides-in-tropical-soils
#17
Enock Dankyi, Chris Gordon, Derick Carboo, Vitus A Apalangya, Inge S Fomsgaard
Neonicotinoids are the most widely applied class of insecticides in cocoa farming in Ghana. Despite the intensive application of these insecticides, knowledge of their fate in the Ghanaian and sub-Saharan African environment remains low. This study examined the behavior of neonicotinoids in soils from cocoa plantations in Ghana by estimating their sorption and degradation using established kinetic models and isotherms. Studies of sorption were conducted using the batch equilibrium method on imidacloprid, thiamethoxam, clothianidin, acetamiprid and thiacloprid, while degradation of imidacloprid, thiamethoxam and their respective deuterated counterparts was studied using models proposed by the European forum for coordination of pesticide fate and their use (FOCUS)...
May 22, 2018: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29784328/determination-of-endrin-and-%C3%AE-keto-endrin-in-five-food-products-of-animal-origin-using-gc-%C3%AE-ecd-a-modified-quechers-approach-to-traditional-detection
#18
Md Musfiqur Rahman, Han Sol Lee, A M Abd El-Aty, Md Humayun Kabir, Hyung Suk Chung, Jong-Hyouk Park, Mi-Ra Kim, Ji-Hyun Kim, Ho-Chul Shin, Sung Shik Shin, Jae-Han Shim
A simple quick, easy, cheap, effective, rugged, and safe (QuEChERS)-based method was developed for the analysis of endrin and its metabolite, δ-keto endrin, in five animal-derived food products (chicken, pork, beef, egg, and milk) using a gas chromatography-micro electron capture detector (GC-μECD). Samples were extracted with acidified acetonitrile, salted out with magnesium sulfate and sodium acetate, and finally purified with a dual layer solid-phase extraction cartridge (SPE) that contains both Supelclean ENVI-Carb (upper layer) and primary secondary amine (lower layer) SPE sorbents...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29784317/sensitive-determination-of-cyclopiazonic-acid-in-dry-cured-ham-using-a-quechers-method-and-uhplc-ms-ms
#19
Belén Peromingo, Mar Rodríguez, Félix Núñez, Antonio Silva, Alicia Rodríguez
An extraction method and an UHPLC-MS/MS method for the quantification of CPA in dry-cured ham were developed and validated. To optimise detection and quantification of CPA, the composition of mobile phase, flow rates, gradient-related factors and solvents used for resuspension of dry extracts were evaluated. Besides, four extraction methods were tested. The best peak shape and resolution were obtained by eluting the mobile phase consisting in acetic acid-ammonium acetate buffer pH 5.75/methanol in gradient mode at a flow rate of 0...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29777494/residue-behavior-and-risk-assessment-of-thifluzamide-in-the-maize-field-ecosystem
#20
Cong Ma, Zhongdong Liu, Yan Qi, Shanshan Wang, Xiaolin Cao, Jing Wang, Yongxin She, Yong Shao, Jitai Shen, Chao Zhang, Zejun Jiang
In the present work, the dissipation kinetics and final residue levels of thifluzamide in the maize field ecosystem were investigated. Using a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction combined with liquid chromatography-tandem mass spectrometric detection (LC-MS/MS), a rapid, sensitive, efficient, and reliable method for extraction and quantitative analysis of thifluzamide residues in maize grain, maize plant, and soil was developed. Satisfactory recoveries of 78.7-97.0% were achieved with relative standard deviations (RSDs) in the range of 1...
May 18, 2018: Environmental Science and Pollution Research International
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