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Journal of AOAC International

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https://www.readbyqxmd.com/read/27765084/multiresidue-analysis-of-five-neonicotinoid-insecticides-and-their-primary-metabolite-in-cucumbers-and-soil-using-high-performance-liquid-chromatography-with-diode-array-detection
#1
Lobna A Hussein, Noha F El Azab, Maha F Abdel-Ghany
A sensitive, selective, and validated HPLC-diode-array detection method was developed for the simultaneous determination of five neonicotinoid insecticides-acetamiprid, imidacloprid, nitenpyram, flonicamid, and thiacloprid-and their primary metabolite, 6-chloronicotinic acid, in cucumbers and soil based on the quick, easy, cheap, effective, rugged, and safe (QuEChERS) technique as a pretreatment procedure. In the QuEChERS procedure, cucumber samples were extracted with acetonitrile and cleaned using C18, whereas soil samples were extracted with an acetonitrile-dichloromethane mixture (1 + 2)...
October 19, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27765083/determination-of-diphenylether-herbicides-in-water-samples-using-dispersive-liquid-liquid-microextraction-combined-with-high-performance-liquid-chromatography
#2
Yung-Hao Liu, Pai-Shan Chen, Shang-Da Huang
Shaker-assisted dispersive liquid-liquid microextraction (SA-DLLME) and surfactant dispersive liquid-liquid microextraction (SDLLME) have been developed to determine five diphenylether herbicides in water samples using high-performance liquid chromatography with photodiode array detection (HPLC-PDA). For SA-DLLME, an up-and-down shaker-assisted emulsification was used. Extraction was complete in 3 min. Only 30 μL of decyl acetate was required, without a dispersive solvent. The linear range was from 2 to 1000 μg L(-1), the coefficient of determination (r (2)) was better than 0...
October 19, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27765082/investigation-of-the-virulence-factors-and-molecular-characterization-of-the-clonal-relations-of-multidrug-resistant-acinetobacter-baumannii-isolates
#3
Ahmed Abdel Megeed, M Ali Hayssam, Mohamed Z M Salem, Mohamed S El-Shikh, Ibrahim Ahmed Talea, Yahya A Alogaibi
Multidrug-resistant (MDR) Acinetobacter baumannii infections are a great public health concern and demand continuous surveillance and antibiotic stewardship. Virulence traits and the pathogenicity of Acinetobacter are less studied compared with the molecular epidemiological and antibiotic resistance profile of this organism. In our present study, we investigated the primary characteristics contributing to the virulence of MDR A. baumannii isolates and compared them with avirulent isolates. A total of 32 well-characterized MDR A...
October 19, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27765081/development-of-a-multiplex-pcr-system-for-the-simultaneous-detection-of-the-shrimp-species-fenneropenaeus-chinensis-litopenaeus-vannamei-and-penaeus-monodon
#4
Eun-Hee Shin, Ji-Hun Shin, You-Won Lee, Seung-Ha Lee, Chun-Feng Xin
Due to mixed use of shrimp in foodstuffs, it is important to distinguish Fenneropenaeus chinensis from other shrimp species, such as Litopenaeus vannamei and Penaeus monodon. For this purpose, we have developed a multiplex PCR method to detect the simultaneous presence of all three species. Universal primers specific to the 16S ribosomal RNA subunit were used to sequence and ascertain the species in the samples. In this study, specific primers were designed to result in a unique PCR product size (143, 260, and 348 bp for L...
October 19, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27765080/survey-of-thai-commercial-food-products-that-have-been-reported-to-contain-no-wheat-rye-barley-or-gluten-according-to-their-labels
#5
Sirinrat Srikulnath, Vipa Surojanametakul, Pailin Chamnansin, Hirotoshi Tamura, Masahiro Shoji
Celiac disease (CD) and gluten-related disorders are significant health and social issues in Western countries, and CD individuals need to exclude gluten from their diets. The adverse health impacts of CD have extended to Asian countries in which CD was not a problem previously. Thai commercial food products that do not contain wheat, rye, barley, or gluten on their labels were surveyed as to whether they were suitable for CD individuals by examining the absence of gluten or the presence of gluten <20 ppm...
October 19, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27760589/bioanalytical-method-validation-for-dronedarone-and-duloxetine-in-blood-serum
#6
Alka Bali, Renu Chadha, Gulshan Bansal
The present work relates to the development and validation of reversed-phase HPLC-UV-photodiode array methods for the estimation of two drugs in blood serum: dronedarone hydrochloride (DDN), a class III antiarrhythmic drug, and duloxetine hydrochloride (DLX), an antidepressant. Chromatographic analysis of DLX was carried out on a Nucleodur C18 column (250 × 4.6 mm, 5 μm) using ammonium acetate buffer (32 mM, pH 5.5) and acetonitrile (40 + 60, v/v; flow rate of 1.0 mL/min; detection wavelength of 290 nm) as the mobile phase...
October 18, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27760588/development-of-loop-mediated-isothermal-amplification-lamp-assay-for-the-rapid-detection-of-alternaria-alternata
#7
Huaqi Tang, Chunsheng Liu, Yanpeng Li, Xinyue Zhang, Guojie Xu
Fungi of the Alternaria genus are associated with allergic diseases, with Alternaria alternata being one of the most prevalent species. A. alternata has been frequently reported as the etiologic agent of hypersensitivity pneumonitis, allergic rhinosinusitis, bronchial asthma, and other diseases. In this study, we developed a loop-mediated isothermal amplification (LAMP) assay and a real-time PCR assay to detect low levels of A. alternata in herbal tea samples. The LAMP assay can detect as little as 3 pg/μL of A...
October 18, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27751203/lc-ms-ms-validation-of-a-residue-analysis-method-for-penicillin-g-and-its-metabolites-in-commercial-orange-juice
#8
Fadi Aldeek, Walter Hammack, Mark R Crosswhite, Matthew Standland, Daniele Canzani, Ghislain Gerard, Jo-Marie Cook
Florida citrus depends on a breakthrough in the fight against citrus greening disease. Of the antibiotics used to treat this disease, penicillin G has been one of the most effective. Because orange fruit grown in the state of Florida are mainly used to produce orange juice, we have validated an ultra-HPLC tandem MS method to screen for penicillin G and its metabolites (penillic and penilloic acids) at the chemical residue level after treatment. In this method, three spike levels (0.25, 1, and 20 ng/g) were tested in triplicate...
October 15, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27743445/development-and-validation-of-a-reversed-phase-chiral-hplc-method-to-determine-the-chiral-purity-of-bulk-batches-of-s-enantiomer-in-afoxolaner
#9
Satish Kumar, Abu Rustum, Nilusha Padivitage
Afoxolaner is a new antiparasitic molecule from the isoxazoline family that acts on insect acarine γ-aminobutyric acid and glutamate receptors. Afoxolaner is a racemic mixture, which has a chiral center at the isoxazoline ring. A reversed-phase chiral HPLC method has been developed to determine the chiral purity of bulk batches of (S)-enantiomer in afoxolaner for the first time. This method can also be used to verify that afoxolaner is a racemic mixture, which was demonstrated by specific rotation. ChromSword, an artificial intelligence method development tool, was used for initial method development...
October 13, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27743444/chromatographic-fingerprints-combined-with-chemometric-methods-reveal-the-chemical-features-of-authentic-radix-polygalae
#10
Xiaojuan Zhang, Dabing Ren, Zhibiao Yi, Lunzhao Yi, Zhongquan Xin
GC-MS fingerprints of Radix Polygalae (RP) were measured for deliberately collected samples. A total of 88 volatile components were identified and quantified by subwindow factor analysis, heuristic evolving latent projection, and retention index. Next, an efficient discrimination model based on partial least-squares (PLS) discriminant analysis (DA) was developed to distinguish the superior RP samples from the inferior ones, and the reliability and predictive ability of the model was evaluated by cross-validation and permutation tests...
October 13, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27725074/determination-of-mitragynine-in-mitragyna-speciosa-raw-materials-and-finished-products-by-liquid-chromatography-with-uv-detection-single-laboratory-validation
#11
Elizabeth M Mudge, Paula N Brown
Mitragyna speciosa (kratom) is a tree indigenous to Southeast Asia, and its leaves are used in herbal formulations because they contain indole alkaloids mitragynine and 7-hydroxy (7-OH) mitragynine. An HPLC method was developed, optimized, and validated using single-laboratory validation guidelines to quantify mitragynine in kratom raw materials and finished products. The method optimization evaluated several extraction parameters including solvent type, solvent volume, time, and extraction method. The separation of the mitragynine alkaloids was achieved in 18 min with a fused-core C18 EVO column using gradient separation with ammonium bicarbonate (pH 9...
October 8, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27725073/high-throughput-analytical-techniques-for-the-determination-of-the-residues-of-653-multiclass-pesticides-and-chemical-pollutants-in-tea-part-vii-a-gc-ms-gc-ms-ms-and-lc-ms-ms-study-of-the-degradation-profiles-of-pesticide-residues-in-green-tea
#12
Jie Li, Fang Yang, Qiao-Ying Chang, Guo-Fang Pang, Hui Chen, Chun-Lin Fan
GC-MS, GC-tandem MS (MS/MS), and LC-MS/MS were used to mathematically define the degradation profiles of pesticide residues in two field trials. Nineteen pesticides were studied in the first field trial and 11 in the second. The results of the field trials demonstrated that the degradation profiles of pesticide residues in green tea can be described with power functions to successfully estimate the amount of time, following pesticide application, pesticide residues appearing in tea in concentrations at and/or above the maximum residue limit (MRL) decrease to concentrations below the MRL...
October 8, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27697104/validation-of-the-applied-biosystems-rapidfinder-shiga-toxin-producing-e-coli-stec-detection-workflow
#13
Sharon Matheny, Robert Tebbs, Erin Crowley, David Goins, Angelia Burrell, Patrick Bird, Michelle Swimley, M Joseph Benzinger, Jonathan Flannery, Jonathan Cloke, James Agin, Benjamin Bastin
The Applied Biosystems™ RapidFinder™ STEC Detection Workflow (Thermo Fisher Scientific) is a complete protocol for the rapid qualitative detection of Escherichia coli (E. coli) O157:H7 and the "Big 6" non-O157 Shiga-like toxin-producing E. coli (STEC) serotypes (defined as serogroups: O26, O45, O103, O111, O121, and O145). The RapidFinder STEC Detection Workflow makes use of either the automated preparation of PCR-ready DNA using the Applied Biosystems PrepSEQ™ Nucleic Acid Extraction Kit in conjunction with the Applied Biosystems MagMAX™ Express 96-well magnetic particle processor or the Applied Biosystems PrepSEQ Rapid Spin kit for manual preparation of PCR-ready DNA...
October 1, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27697097/chromatographic-analysis-of-a-multicomponent-mixture-of-b1-b6-b12-benfotiamine-and-diclofenac-part-i-hplc-and-uplc-methods-for-the-simultaneous-quantification-of-these-five-components-in-tablets-and-capsules
#14
Maha Abdel-Monem Hegazy, Ahmed Salah Fayed, Nada Sayed Abdel Wahab
New, simple, highly sensitive, precise, and accurate gradient reversed-phase chromatographic methods were developed using HPLC and ultra-HPLC (UPLC) systems for the determination of five components, namely thiamine, pyridoxine, cyanocobalamin, benfotiamine, and diclofenac in tablets and capsules. The methods were compared for their efficiency in the separation and determination of these five compounds using two different C18 columns (250 × 4.6 mm, 5 μm; and 100 × 4.6 mm, 2.6 μm) for HPLC and UPLC, respectively...
October 1, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27697102/use-of-carbon-nanotubes-for-the-analysis-of-pesticide-residues-in-fruits-and-vegetables
#15
Lukman Bola Abulrauf, Guan Huat Tan
This review presents the application of carbon nanotubes as sorbent materials in the analysis of pesticide residues in fruits and vegetables. The advantages, limitations, and challenges of carbon nanotubes, with respect to their use in analytical chemistry, are presented. The efficiency of their application as extraction sorbent materials (in terms of LOD, LOQ, linearity, relative recovery, and RSD) in SPE, solid-phase microextraction, multi-plug filtration clean-up, matrix solid-phase dispersion, and the quick, easy, cheap, effective, rugged and safe method is reported...
September 30, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27697101/use-of-carbon-nanotubes-for-the-analysis-of-pesticide-residues-in-fruits-and-vegetables
#16
Lukman Bola Abdulrauf, Guan Huat Tan
This review presents the application of carbon nanotubes as sorbent materials in the analysis of pesticide residues in fruits and vegetables. The advantages, limitations, and challenges of carbon nanotubes, with respect to their use in analytical chemistry, are presented. The efficiency of their application as extraction sorbent materials (in terms of LOD, LOQ, linearity, relative recovery, and RSD) in SPE, solid-phase microextraction, multi-plug filtration clean-up, matrix solid-phase dispersion, and the quick, easy, cheap, effective, rugged and safe method is reported...
September 30, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27697094/determination-of-withanolides-in-withania-somnifera-by-liquid-chromatography-single-laboratory-validation-first-action-2015-17
#17
Mayachari Shivanand Anand, Sharon L Brunelle, Balasubramanian Murali, Rojison Koshy
An LC method was developed and validated in 2007 for analyzing Withania somnifera raw material (root) and dried extracts for withanolide content, including withanoside IV, withanoside V, withaferin A, 12-deoxywithastromonolide, withanolide A, and withanolide B. The method involved the extraction of the analytes with methanol, their subsequent filtration, and then analysis on a C18 column with an acetonitrile gradient and UV detection. Single-laboratory validation yielded linearity generally in the range of 20 to 200 μg/mL for each analyte, with a repeatability precision of RSD < 3% in most cases, and recovery in the range of 90 to 105%...
September 30, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27874826/optimization-and-validation-of-a-fast-uplc-method-for-simultaneous-determination-of-hydroquinone-kojic-acid-octinoxate-avobenzone-bha-and-bht
#18
Fanny Galimany-Rovira, Montse Miñarro-Carmona, Pilar Pérez-Lozano, Encarna García-Montoya, Josep R Ticó-Grau, Josep M Suñé-Negre
A previously published HPLC method for the simultaneous determination of six major components (hydroquinone, kojic acid, octinoxate, avobenzone, butylated hydroxyanisole, and butylated hydroxytoluene) in a skin-whitening cream was transferred and optimized to an ultra-performance LC system. Separation was achieved in a ZORBAX SB-Phenyl Rapid-Resolution High Throughput column (2.1 × 100 mm, 1.8 μm), using a mobile phase consisting of water with 0.1% acetic acid and acetonitrile at a flow rate of 0.7 mL/min...
September 29, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27667201/recent-advances-in-analysis-of-pesticides-in-food-and-drink-samples-using-lpme-techniques-coupled-to-gc-ms-and-lc-ms-a-review
#19
Ali Mohammed Ali Alsharif, Abubakar Lawal, Guan Huat Tan
Food quality and food safety are major challenges affecting agricultural and industrial aspects of production. Many contaminants from different sources contaminate foods and drinks, leading to disastrous health problems like gene mutations and cancer. Previously, many different methods have been used for the analysis of these contaminants. Liquid-liquid extraction (LLE) has been the most well-known conventional technique used, but its limitations are its tediousness, time required, and the use of large quantities of toxic organic solvents...
September 23, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27653928/sensitive-determination-of-sertraline-in-commercial-drugs-and-its-stability-check-in-simulated-gastric-juice
#20
Sezgin Bakırdere, Seyfullah Keyf, Elif Seda Koçoğlu
A sensitive analytical method was developed for the determination of sertraline in commercial drug samples by using GC-MS. The selected-ion monitoring mode was used at the most sensitive m/z 274 to obtain a lower detection limit. LOD/LOQ values were obtained as 1.6/5.4 ng/mL for sertraline under the optimum conditions. The calibration plot was linear between 5.0 and 2000 ng/mL with the correlation coefficient of 0.9999. The validated method was successfully applied to three different brands of drug samples for both qualitative and quantitative measurement of sertraline...
September 21, 2016: Journal of AOAC International
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