Read by QxMD icon Read


Sara C Cunha, S Sá, José O Fernandes
Nuts consumption plays an important role in Mediterranean diet, being a good source of proteins, vitamins, minerals and unsaturated fatty acids. However, nuts can be also a source of harmful mycotoxins with negative impact on human health. In this work, the occurrence of 16 mycotoxins belonging to different chemical classes, was assessed in several nut products. The analytical method used was based on modified QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) procedure followed by liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis...
February 16, 2018: Food and Chemical Toxicology
Anna Bauer, Juergen Kuballa, Sascha Rohn, Eckard Jantzen, Jens Luetjohann
An ion mobility quadrupole time-of-flight mass spectrometry-based pesticide suspect screening methodology was developed and validated covering 20 plant-derived food matrices deriving from six commodity groups of different complexity according to the actual European Commission document SANTE/11813/2017 applying a QuEChERS sample preparation protocol. The method combines ultra-performance liquid chromatography travelling-wave ion mobility and quadrupole time-of-flight mass spectrometry. Besides the determination of the physicochemical property collision cross section and the establishment of a corresponding scientific suspect screening database comprising 280 pesticides, for several pesticides different protomers, sodium adducts, as well as dimers were identified in ion mobility spectrometry traces...
February 15, 2018: Journal of Separation Science
Jose Antonio Murillo Pulgarin, Luisa Fernanda García Bermejo, Armando Carrasquero
High Performance Liquid Chromatography (HPLC) was used to separate oxamyl from other pesticides in drinking water and tomato paste. The eluate emerging from the column tail was mixed with an alkaline solution of Co2+ in EDTA and irradiated with UV light to induce photolysis of the carbamate in order to obtain free radicals and other reactive species that oxidize luminol and produce chemiluminescence (CL) as a result. The intensity of the CL signal was monitored in the form of chromatographic peaks. Under the optimum operating conditions for the HPLC-UV-CL system, the analyte concentration was linearly related to peak area...
February 14, 2018: Journal of Agricultural and Food Chemistry
F Vetter, C Müller, M Stöckelhuber, F Bracher
Cinnamon is a traditional herbal drug, but more importantly, it is used as a flavor compound in the production of foodstuff. Due to the content of significant concentrations of coumarin in Cassia cinnamon, effective control of the coumarin content in seasonal bakery products like ginger bread and cinnamon biscuits is urgently needed. Here we present a novel, fast and fully validated protocol for the determination of coumarin in marketed bakery products using the QuEChERS sample preparation technique in combination with GC-MS analysis...
June 1, 2017: Die Pharmazie
Shiv Singh, Anshuman Srivastava, Sheelendra Pratap Singh
Phenolic resin based activated carbon fibers (ACFs) were applied for the first time as a reversed-dispersive solid-phase extraction (r-DSPE) sorbent. A modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method was applied to determine 26 pesticides (organophosphates, organochlorines, synthetic pyrethroids, and herbicides) in different complex matrices, including cauliflower, cucumber, banana, apple, wheat, and black gram. Different physicochemical characterization techniques were used to investigate the engineering and structural properties of the r-DSPE sorbent...
February 12, 2018: Analytical and Bioanalytical Chemistry
Yanxia Ni, Huan Yang, Hantong Zhang, Qiao He, Siqi Huang, Meiling Qin, Shuangshuang Chai, Huanhuan Gao, Youning Ma
A modified Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) sample preparation method, coupled with liquid chromatography-electrospray ionization tandem mass spectrometry, has been developed for the simultaneous analysis of four commonly used sulfonylurea herbicides, ethoxysulfuron, halosulfuron-methyl, mesosulfuron-methyl and orthosulfamuron, in rice, maize, wheat and soybean. Adsorption of the analytes onto the primary-secondary amine used in the clean-up step was avoided by using 1% formic acid in acetonitrile as the extraction solvent to maintain the acidic herbicides in a non-ionized state...
February 16, 2018: Journal of Chromatography. A
Shun Mizuno, Xiao-Pen Lee, Masaya Fujishiro, Takaaki Matsuyama, Miho Yamada, Yuki Sakamoto, Maiko Kusano, Kei Zaitsu, Chika Hasegawa, Iwao Hasegawa, Takeshi Kumazawa, Akira Ishii, Keizo Sato
A new high-throughput method was developed for analysis of valproate in human plasma samples by QuEChERS extraction and gas chromatography-tandem mass spectrometry (GC-MS/MS). Plasma samples (0.2 ml) spiked with valproate and secobarbital-d5 (internal standard) were diluted with 1.3 ml of distilled water. Acetonitrile (1 ml) was added followed by 0.4 g MgSO4 and 0.1 g NaOAC. After a centrifugation step (2000 g for 10 min), 1 ml of the supernatant was transferred to a dispersive-solid phase extraction (dSPE) tube containing 150 mg MgSO4 and 50 mg C18...
February 3, 2018: Legal Medicine
Elisa Helena da Costa Morais, Carol Hollingworth Collins, Isabel Cristina Sales Fontes Jardim
In this work, a rapid, effective, and safe method, generating only a small amount of waste, based on the citrate version of QuEChERS was optimized and validated for multiresidue determination of pesticides of different classes in sweet green peppers, determined by liquid chromatography coupled with tandem mass spectrometry. The matrix components influenced the measurement of the pesticides by the developed analysis technique, so that, analytical curves were prepared using pesticide-free matrix extracts for quantification of the analytes...
May 30, 2018: Food Chemistry
Yool-Ah Kim, A M Abd El-Aty, Md Musfiqur Rahman, Ji Hoon Jeong, Ho-Chul Shin, Jing Wang, SungShik Shin, Jae-Han Shim
In the present study, a liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method with a minimal matrix effect (ME) was developed and validated for simultaneous determination of a diverse range of pesticides (49) in kiwifruit. Samples extracted by the quick, easy, cheap, effective, rugged, and safe (QuEChERS) citrate-buffered method were analyzed either without purification or following purification (with primary secondary amine (PSA) or PSA + graphitized carbon black (GCB)). With the addition of a clean-up step, the suppression of the ME decreased, with a higher number of pesticides determined by the application of PSA + GCB...
February 15, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Farag Malhat, Konstantinos M Kasiotis, Shehata Shalaby
Cyantraniliprole is an anthranilic diamide insecticide, belonging to the ryanoid class, with a broad range of applications against several pests. In the presented work, a reliable analytical technique employing high-performance liquid chromatography coupled with photodiode array detector (HPLC-DAD) for analyzing cyantraniliprole residues in tomato was developed. The method was then applied to field-incurred tomato samples collected after applications under open field conditions. The latter aimed to ensure the safe application of cyantraniliprole to tomato and contribute the derived residue data to the risk assessment under field conditions...
February 5, 2018: Environmental Monitoring and Assessment
Marina López-García, Roberto Romero-González, Antonia Garrido Frenich
A new analytical method based on ultra-high performance liquid chromatography (UHPLC) coupled to Orbitrap high resolution mass spectrometry (Orbitrap-HRMS) has been developed for the determination of steroid hormones (hydrocortisone, cortisone, progesterone, prednisone, prednisolone, testosterone, melengesterol acetate, hydrocortisone-21-acetate, cortisone-21-acetate, testosterone propionate, 17α-methyltestosterone, 6α-methylprednisolone and medroxyprogesterone) and their metabolite (17α-hydroxyprogesterone) in three meat samples (chicken, pork and beef)...
January 31, 2018: Journal of Chromatography. A
Christina I Nannou, Vasiliki I Boti, Triantafyllos A Albanis
The present study describes the optimization and validation of an analytical method based on quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction and purification with dispersive solid-phase extraction (dSPE) before analysis, followed by ultrahigh-performance liquid chromatography-high-resolution linear ion trap/Orbitrap (LTQ Orbitrap) mass spectrometry for the determination of 18 pesticides in sediment. To optimize process efficiency, parameters such as pH, extraction salts, sediment amount, and cleanup sorbents were evaluated...
February 1, 2018: Analytical and Bioanalytical Chemistry
Luca Maria Chiesa, Maria Nobile, Renato Malandra, Davide Pessina, Sara Panseri, Giuseppe Federico Labella, Francesco Arioli
Reviewing the presence of contaminant residues is important both for food safety and monitoring of environmental pollution. Here, the occurrence of 6 polychlorinated biphenyls (PCBs), 15 organochlorine pesticides (OCPs), 7 polybrominated diphenyl ethers (PBDEs), 4 polycyclic aromatic hydrocarbons (PAHs) and 17 perfluoroalkyl substances (PFASs) was evaluated in mussels and clams. A liquid chromatography-high resolution mass spectrometry (HPLC-HRMS) and an innovative QuEChERS extraction followed by gas chromatography-tandem mass spectrometry (GC-MS/MS) methods were developed, validated and applied...
February 1, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Osama I Abdallah, Saleh S Alamer, Abdulmajeed M Alrasheed
A sensitive, simple and rapid QuEChERS extraction method and liquid chromatography equipped with triple quadrupole mass spectrometry (LC-MS/MS) were used to evaluate 42 pesticides in dates. Acidified acetonitrile and citrate buffer salts were used to extract re-hydrated samples. Acceptable validation performances were achieved, i.e., recovery range of 70-120 % and RSD values ≤20 % for 42 analytes at three different concentrations,100, 50 and 10 μg kg-1 . This method was used to analyse 200 date fruit samples (v...
January 27, 2018: Biomedical Chromatography: BMC
A Pouliopoulos, E Tsakelidou, A Krokos, H G Gika, G Theodoridis, N Raikos
The aim of the study was to develop a LC-MS-MS method able to detect and quantify a number of frequently prescribed antipsychotic and antidepressant drugs for toxicological purposes. Separation of compounds was performed on a C-18 RP column by Ultra High-Pressure Chromatography over a 11 min run. A modified single step QuEChERS protocol consisted essentially by the addition of acetonitrile, potassium carbonate and magnesium sulfate in 100 μL of sample, vortexing, centrifugation and evaporation has been selected...
January 24, 2018: Journal of Analytical Toxicology
Wenquan Mei, Qiwan Li, Haixian Fang, Huichun Geng, Xinglian Chen
A method was developed for the determination of six amide herbicides, such as acetochlor, alachlor, metolachlor, metazachlor, butachlor and pretilachlor, by QuEChERS-gas chromatography-mass spectrometry. The soil samples were extracted by 10 mL acetonitrile, 10 mL deionized water and 4 g sodium chloride, then purified with 50 mg N-propyl ethylenediamine (PSA), 50 mg C18, 10 mg graphitized carbon black (GCB) and 100 mg MgSO4. Low-polar silica capillary column HP-5MS was used. The extracts were detected by electron impact ionization (EI) source in the selected ion monitoring (SIM) mode...
December 8, 2017: Se Pu, Chinese Journal of Chromatography
Yongtao Liu, Linxue Yu, Zhenyue Wang, Qiuhong Yang, Jing Dong, Yibin Yang, Xiaohui Ai
A method was established for the simultaneous determination of seven avermectin (AVMs) residues, such as avermectin, ivermectin, doramectin, selamectin, eprinomectin, moxidectin and emamectin, in aquatic products using modified QuEChERS and high-performance liquid chromatography -tandem mass spectrometry (HPLC-MS/MS). The samples were extracted with 0.2% (v/v) ammoniate acetonitrile, and then 3 g of anhydrous magnesium sulfate and 2 g of anhydrous sodium sulfate were added to remove moisture and precipitate proteins...
December 8, 2017: Se Pu, Chinese Journal of Chromatography
Jia Zheng, Cunxian Xi, Shurui Cao, Guomin Wang, Bobin Tang, Zhi Wang, Zhaode Mu
A method for the simultaneous determination of 21 illegally added chemical drugs in improving sleep and immunity health foods using ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was developed. Oral liquid and health wine samples were shaken with acetonitrile and acetonitrile-water-formic acid (60:39:1, v/v/v), respectively, then purified by QuEChERS method. The extracts were separated on an Acquity UPLCTM BEH C18 column (50 mm×2.1 mm, 1.7 μm) with gradient elution of acetonitrile and 2 mmol/L ammonium acetate solution containing 0...
December 8, 2017: Se Pu, Chinese Journal of Chromatography
Weijian Shen, Han Liu, Rui Zhang, Keyao Yu, Lisheng Cai, Yan Liu, Hong Wang
A method was established for the determination of fipronil and its metabolites in eggs and egg products with gas chromatography-negative chemical ionization-mass spectrometry (GC-NCI-MS). The targets were extracted from samples with acetonitrile, and followed by a simple cleanup step known as dispersive solid-phase extraction QuEChERS. The extracts were determined by GC-NCI-MS, and quantified by external standard method with matrix correction standard curves. The recoveries were in the range of 87.0% to 99...
December 8, 2017: Se Pu, Chinese Journal of Chromatography
Danyu Shen, Xinyue Yuan, Yanping Zhang, Yongxiang HANan, Yihua Liu, Runhong Mo, Donglian Zhong, Fubin Tang
A method based on the cleaning effects of different sorbents and gas chromatography-triple quadrupole mass spectrometry (GC-QQQ-MS/MS) was developed for the determination of 18 polychlorinated biphenyls (PCBs) in camellia seeds. The camellia seeds were extracted with acetonitrile, salted out with sodium chloride, then cleaned-up by QuEChERS with anhydrous MgSO4, C18, primary secondary amine (PSA), and multi walled carbon nanotubes (NANO) using multiple vortex after the centrifugal separation, and finally analyzed by GC-QQQ-MS/MS in multiple reaction monitoring mode via positive electrospray ionization...
November 8, 2017: Se Pu, Chinese Journal of Chromatography
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"