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Journal of AOAC International

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https://www.readbyqxmd.com/read/28432760/determination-of-ochratoxin-a-in-black-and-white-pepper-nutmeg-spice-mix-cocoa-and-drinking-chocolate-by-high-performance-liquid-chromatography-coupled-with-fluorescence-detection-collaborative-study
#1
Elena Cubero-Leon, Katrien Bouten, Hamide Senyuva, Joerg Stroka
A method validation study for the determination of ochratoxin A in black and white pepper (Piper spp.), nutmeg (Myristica fragrans), spice mix (blend of ginger, turmeric, pepper, nutmeg, and chili), cocoa powder, and drinking chocolate was conducted according to the International Harmonized Protocol of the International Union of Pure and Applied Chemistry. The method is based on the extraction of samples with aqueous methanol, followed by a cleanup of the extract with an immunoaffinity column. The determination is carried out by reversed-phase LC coupled with a fluorescence detector...
April 22, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28429676/determination-of-dinotefuran-and-its-metabolites-in-orange-pulp-orange-peel-and-whole-orange-using-liquid-chromatography-tandem-mass-spectrometry
#2
Zaihui Yang, Kankan Zhang, Lingzhu Chen, Bin Liu, Qingtao Zhang, Haizhen Zhang, Caiyuan Sun, Deyu Hu
Determination of the polar characteristics of dinotefuran and metabolite residues in orange matrixes (orange pulp, orange peel, and whole orange) is difficult. Thus, the purpose of the present study was to develop an extraction method for the determination of dinotefuran and its metabolites in oranges by using liquid chromatography with tandem mass spectrometry (LC-MS/MS). Matrix suppression effects were observed for all analytes in the orange matrixes. The proposed method displayed satisfactory linearity (R(2) ≥ 0...
April 21, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28425396/development-and-single-laboratory-validation-of-a-liquid-chromatography-tandem-mass-spectrometry-method-for-quantitation-of-tetrodotoxin-in-mussels-and-oysters
#3
Andrew D Turner, Michael J Boundy, Monika Dhanji Rapkova
In recent years, evidence has grown for the presence of tetrodotoxin (TTX) in bivalve mollusks, leading to the potential for consumers of contaminated products to be affected by Tetrodotoxin Shellfish Poisoning (TSP). A single-laboratory validation was conducted for the hydrophilic interaction LC (HILIC) tandem MS (MS/MS) analysis of TTX in common mussels and Pacific oysters-the bivalve species that have been found to contain TTXs in the United Kingdom in recent years. The method consists of a single-step dispersive extraction in 1% acetic acid, followed by a carbon SPE cleanup step before dilution and instrumental analysis...
April 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28425394/near-infrared-spectrum-detection-of-wheat-gluten-protein-content-based-on-a-combined-filtering-method
#4
Jian-Hua Cai
To eliminate the random error of the derivative near-IR (NIR) spectrum and to improve model stability and the prediction accuracy of the gluten protein content, a combined method is proposed for pretreatment of the NIR spectrum based on both empirical mode decomposition and the wavelet soft-threshold method. The principle and the steps of the method are introduced and the denoising effect is evaluated. The wheat gluten protein content is calculated based on the denoised spectrum, and the results are compared with those of the nine-point smoothing method and the wavelet soft-threshold method...
April 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28425393/magnetic-graphene-oxide-as-an-efficient-adsorbent-for-the-separation-and-preconcentration-of-cu-ii-pb-ii-and-cd-ii-from-environmental-samples
#5
Mustafa Soylak, Demet Acar, Erkan Yilmaz, Sherif A El-Khodary, Mohamed Morsy, Medhat Ibrahim
The separation and preconcentration of copper(II), lead(II), and cadmium(II) ions on magnetic graphene oxide (MGO) by solid-phase extraction was carried out. Quantitative recovery was obtained by adsorption of analytes on MGO at pH 6 and elution of 3 M HNO3 in 10% acetone. To optimize the presented method, the effects of various parameters-including pH, eluent conditions, and vortex time-were examined. Matrix effects were also investigated. Mean recoveries of the analytes were between 95 and 105%. The proposed method was validated by applying it to certified reference materials...
April 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28425389/simultaneous-analysis-of-simple-coumarins-and-furocoumarines-in-cigarettes-by-solid-phase-extraction-with-gas-chromatography-mass-spectrometry
#6
Yang Zheng, Xiuli Xu, Fei Yuan, Meiyi Yao, Shunli Ji, Zhiqiang Huang, Feng Zhang
A sensitive, high-throughput analytical method based on a GC-MS method was established for the simultaneous quantitative determination of two categories of harmful coumarins: simple coumarins (coumarin, 6-methylcoumarin, 7-methoxycoumarin, 3,4-dihydrocoumarin, and 7-ethoxy-4-methylcoumarin) and furocoumarines (psoralen, 8-methoxypsoralen, 5-methoxypsoralen, and trioxysalen). The nine analytes were extracted with ethyl acetate, purified with Oasis HLB solid-phase extraction (SPE) cartridges, and identified and quantitatively determined by GC-MS in selected-ion monitoring mode...
April 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28425392/an-improved-method-for-the-quantification-of-thiamine-vitamin-b1-in-cocoa-containing-beverage-powders
#7
Frédéric Martin, Liliane Meyer, Konstantinos Zelianos, Esther Campos Gimenez
The purpose of this work was to understand low recoveries of thiamine (vitamin B1) when extracted from cocoa-containing beverage powders fortified with water-soluble vitamin B1, and to develop and validate a new procedure to improve these results. Based on the literature, previous trials have focused on two main factors: pH value prior to paper filtration and the need for solid-phase extraction (SPE) clean up. We demonstrate that by following European Standard EN 14122, recovery of thiamine in cocoa-containing beverage powders is low and dependent on the test portion (86 and 72% for 0...
April 19, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28425391/new-analytical-applications-for-food-antigens
#8
Norimasa Tamehiro
No abstract text is available yet for this article.
April 19, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421985/design-of-a-sensitive-and-selective-electrochemical-aptasensor-for-the-determination-of-the-complementary-cdna-of-mirna-145-based-on-the-intercalation-and-electrochemical-reduction-of-doxorubicin
#9
Maryam Mohamadi, Ali Mostafavi, Masoud Torkzadeh-Mahani
<p>The aim of this research was the determination of a microRNA (miRNA) using a DNA electrochemical aptasensor. In this biosensor, the complementary complementary DNA (cDNA) of miRNA-145 (a sense RNA transcript) was the target strand and the cDNA of miRNA-145 was the probe strand. Both cDNAs can be the product of the reverse transcriptase-polymerase chain reaction of miRNA. The proposed aptasensor's function was based on the hybridization of target strands with probes immobilized on the surface of a working electrode and the subsequent intercalation of doxorubicin (DOX) molecules functioning as the electroactive indicators of any double strands that formed...
April 19, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421989/application-of-an-hplc-method-for-selective-determination-of-phenazopyridine-hydrochloride-theoretical-and-practical-investigations
#10
Khalid A M Attia, Nasr M El-Abasawi, Ahmed El-Olemy, Ahmed H Abdelazim
HPLC method was developed for the selective determination of phenazopyridine hydrochloride (PAP) in the presence of itscomputationally selected metabolite. Density functional theory was applied as a computational model to study the energy of PAP metabolites, and the results revealed that 2,3,6-triaminopyridine (TAP) is the most stable metabolite. Good resolution and separation of PAP from TAP was achieved using a reversed-phase BDS Hypersil C18 column with a mobile phase consisting of acetonitrile–water (75 + 25, v/v) at flow rate of 1 mL/min and with UV detection at 280 nm...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421988/composite-magnetic-nanoparticles-cufe2o4-as-a-new-microsorbent-for-extraction-of-rhodamine-b-from-water-samples
#11
Ali Roostaie, Farzad Allahnoori, Shokooh Ehteshami
In this work, novel composite magnetic nanoparticles (CuFe2O4) were synthesized based on sol-gel combustion in the laboratory. Next, a simple production method was optimized for the preparation of the copper nanoferrites (CuFe2O4), which are stable in water, magnetically active, and have a high specific area used as sorbent material for organic dye extraction in water solution. CuFe2O4 nanopowders were characterized by field-emission scanning electron microscopy (SEM), FTIR spectroscopy, and energy dispersive X-ray spectroscopy...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421987/a-new-dispersive-liquid-liquid-microextraction-method-for-preconcentration-and-determination-of-aluminum-iron-copper-and-lead-in-real-water-samples-by-hplc
#12
Güzin Alpdoğan, Şule Dinç Zor
In this study, dispersive liquid–liquid microextraction coupled with HPLC with variable-wavelength detectionwas applied for the simultaneous determination of Al, Fe, Cu, and Pb in various water samples at trace levels. In the proposed method, all the system parameters in both the extraction and separation/determination steps, such as extraction and disperser solvent type and their volumes, complexing reagent concentration, salt addition, extraction and centrifugation times, and pH, were optimized to get not only high extraction efficiency but also lower LODs for the analytes...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421986/all-solid-state-pvc-membrane-and-carbon-paste-ion-selective-electrodes-for-determination-of-donepezil-hydrochloride-in-pharmaceutical-formulation
#13
Nesreen Khamees, Tagreed Abdel-Fattah Mohamed, Abeer Rashad Derar, Azza Aziz
All-solid-state, polyvinyl chloride (PVC) membrane, and carbon paste potentiometric ion-selective electrodes (ISEs) were proposed for the determination of donepezil hydrochloride (DON) in the drug substance and a pharmaceutical formulation. The potentiometric response toward DON was based on the existence of donepezil-tetraphenyl borate (DON-TPB) in a PVC membrane or a carbon paste in the presence of dioctylphthalate. In contrast, the solid-state electrode was prepared by direct incorporation of DON-TPB into a commercial nail varnish without external additives...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421984/stability-indicating-uplc-method-for-the-estimation-of-nadifloxacin-terbinafine-hydrochloride-mometasone-furoate-methyl-paraben-and-propyl-paraben-in-topical-pharmaceutical-dosage-form
#14
Dileep M Bhosale, Anna Pratima G Nikalje
A novel and simple ultra-performance LC method was developed for the estimation of nadifloxacin (NAD), terbinafine hydrochloride (TBH), mometasone furoate (MMF), methyl paraben (MP), and propyl paraben (PP) in a topical pharmaceutical dosage formulation. The analysis was carried out on a Waters Acquity UPLC ethylene bridged hybrid C18 column (50 × 2.1 mm, 1.7 μm) with a flow rate of 0.4 mL/min in gradient mode at a wavelength of 255 nm. Elution of all components was achieved within 9 min. The retention times of MP, NAD, PP, TBH, and MMF were observed at 1...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421983/comparative-study-between-multivariate-and-univariate-analysis-of-two-antidiabetic-combinations
#15
Maha F Abdel-Ghany, Omar Abdel-Aziz, Miriam F Ayad, Mariam M Tadros
New multivariate and univariate methods were developed for the analysis of two novel gliptin combinations by manipulating the zero-order and ratio spectra of empagliflozin and linagliptin in combination, with application on Glyxambi(®) tablets, and of alogliptin and pioglitazone in combination, with application on Oseni(®) tablets. Linearity ranges for chemometric approaches using principal component regression and partial least-squares were found to be 2–10, 2.5–12.5, 5–15, and 5–25 μg/mL for empagliflozin, linagliptin, alogliptin, and pioglitazone, respectively, whereas the respective linearity ranges for the spectrophotometric approaches were found to be 5–15, 2–12, 5–15, and 5–15 μg/mL...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421982/simultaneous-determination-of-volatile-organic-compounds-in-commercial-alcoholic-beverages-by-gas-chromatography-with-flame-ionization-detection
#16
Hyung Min Kim, Gun Yang, Jung Yoon Kim, Sang Jun Yoon, Byong-Kyu Shin, Jeongmi Lee, Jeong Hill Park, Sung Won Kwon
A simple and fast method was developed for the determination of volatile organic compounds in alcoholic beverages. Eleven volatile organic compounds (acetaldehyde, methanol, 2-propanol, <italic>tert</italic>-butanol, 1-propanol, ethyl acetate, 2-butanol, isobutanol, 1-butanol, 3-methyl-1butanol, and 2-methyl-1-butanol) in alcoholic beverages were analyzed with a simple direct-injection method using GC with flame ionization detection. These compounds should be monitored in the QC of production processes because they are detrimental to human health...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28421981/validation-of-max-aqueous-extraction-on-veratox-%C3%A2-for-total-aflatoxin-elisa-test-kit
#17
Brooke E Roman, Dana Driksna, Mohamed M Abouzied, Frank Klein, Jennifer Rice
Neogen Corp. (Lansing, MI) has developed a common aqueous extraction method for the detection of mycotoxins in the ELISA or lateral flow format. The Veratox(®) for Total Aflatoxin ELISA extraction method uses a MAX 2 extraction packet and water in replacement of traditionally used organic solvents. Veratox for Total Aflatoxin has a detection range of 5–50 ppb neat or up to 300 ppb with dilution. The kit development focused on superior cross-reactivity, ability to accurately detect naturally contaminated samples, and utilization of an aqueous extraction method...
April 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28300023/optimization-and-validation-of-a-residue-analysis-method-for-glyphosate-glufosinate-and-their-metabolites-in-plant-matrixes-by-liquid-chromatography-with-tandem-mass-spectrometry
#18
Dasharath P Oulkar, Sandip Hingmire, Arnab Goon, Manjusha Jadhav, Bharat Ugare, Ahammed Shabeer Thekkumpurath, Kaushik Banerjee
A sensitive and accurate LC with tandem MS (MS/MS)-based method was developed and validated for the analysis of the herbicide glyphosate, its metabolite aminomethylphosphonic acid (AMPA), and glufosinate after derivatization with 9-fluorenylmethyl chloroformate (FMOC-Cl) in various plant matrixes. The method also covers direct analysis of the glufosinate metabolites 3-methylphosphinicopropionic acid (3-MPPA) and N-acetyl-glufosinate (NAG). The homogenized samples were extracted with 0.1% formic acid in water-dichloromethane (50 + 50)...
March 23, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28315638/determination-of-triazines-and-triazoles-in-grapes-using-atmospheric-pressure-matrix-assisted-laser-desorption-ionization-high-resolution-mass-spectrometry
#19
Vishal Mahale, Ajeet Singh, Gayatri S Phadke, Avinash D Ghanate, Dasharath P Oulkar, Kaushik Banerjee, Venkateswarlu Panchagnula
A chromatography-free atmospheric pressure matrix-assisted laser desorption/ionization high-resolution mass spectrometry (AP-MALDI HRMS) method is described for the simultaneous and quantitative detection of triazines and triazoles in grapes. The analytes were detected reproducibly with high mass accuracy (mass error within 5 ppm) and further confirmed by collision-induced dissociation fragmentation in tandem MS. The LODs and LOQs for all the analytes were found to be in the nanogram per gram level (15-20 ng/g LOQ)...
March 18, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28303787/screening-natural-content-of-water-soluble-b-vitamins-in-fish-enzymatic-extraction-hilic-separation-and-tandem-mass-spectrometric-determination
#20
Niladri Sekhar Chatterjee, K Ashok Kumar, K K Ajeeshkumar, K R Remya Kumari, K V Vishnu, Rangasamy Anandan, Suseela Mathew, C N Ravishankar
Despite the potential of LC with tandem MS (MS/MS) in improving sensitivity and selectivity, analytical methods are scarce for the determination of protein-bound and phosphorylated forms of B vitamins in food. This prompted us to develop a method for LC-MS/MS determination of naturally occurring nicotinamide, nicotinic acid, thiamine, pyridoxine, riboflavin, pantothenic acid, biotin, folic acid, and cyanocobalamin in fish. Baseline separation of the vitamins was achieved in a hydrophilic interaction LC condition...
March 16, 2017: Journal of AOAC International
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