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Journal of AOAC International

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https://www.readbyqxmd.com/read/28094000/molecular-tracing-of-the-origin-of-six-different-plant-species-in-bee-honey-using-real-time-pcr
#1
Yajun Wu, Yange Yang, Mingchang Liu, Bin Wang, Meige Li, Ying Chen
The quality of honey is significantly influencedby floral origin. Mislabeling floral species occursfrequently in beehoney products. To protectconsumers from economic fraud and maintain afair market environment, methods to identify floralspecies in honey are necessary. In our study, realtimePCRs were established, targeting six honeytypes mainly produced in China (canola, Chinesemilkvetch, Chinese chaste tree, locust tree, litchi,and longan). Sensitivity testing on DNA from planttissues exhibited LODs of about 0...
January 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28084191/application-of-multivariate-classification-protocols-in-research-focusing-on-food-environmental-samples-and-wastewater-technological-processes
#2
Renata Świderska-Dąbrowska, Krzysztof Piaskowski, Michał J Baran
Analysis and quantification of multiple analytes in complex samples originating from food and environmental matrixes generate large data sets that can be difficult to analyze and interpret. Multivariate analysis and related computation protocols provide an effective platform and enable such problems to be dealt with. This review illustrates the effective application of chemometrics protocols used to improve quantification techniques and the interpretation of raw data from complex samples.
January 13, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28084198/determination-of-organophosphorous-pesticides-in-environmental-water-samples-using-surface-engineered-c18-functionalized-silica-coated-core-shell-magnetic-nanoparticles-based-extraction-coupled-with-gc-ms-ms-analysis
#3
Neha Srivastava, Supriya Kumari, Kishore Nair, Samsul Alam, Syed K Raza
The present paper depicts a novel method based on magnetic SPE (MSPE) for the determination of organophosphorus pesticides (OPs) such as phorate, malathion, and chlorpyrifos in environmental water samples. In this study, C18 functionalized silica-coated core-shell iron oxide magnetic nanoparticles (MNPs) were used as a surface-engineered magnetic sorbent for the selective extraction of pesticides from aqueous samples, followed by GC-MS and GC-tandem MS analysis for confirmative determination of the analytes...
January 12, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28084194/evaluation-of-method-specific-extraction-variability-for-the-measurement-of-fatty-acids-in-a-candidate-infant-adult-nutritional-formula-reference-material
#4
Benjamin J Place
To address community needs, the National Institute of Standards and Technology has developed a candidate Standard Reference Material (SRM) for infant/adult nutritional formula based on milk and whey protein concentrates with isolated soy protein called SRM 1869 Infant/Adult Nutritional Formula. One major component of this candidate SRM is the fatty acid content. In this study, multiple extraction techniques were evaluated to quantify the fatty acids in this new material. Extraction methods that were based on lipid extraction followed by transesterification resulted in lower mass fraction values for all fatty acids than the values measured by methods utilizing in situ transesterification followed by fatty acid methyl ester extraction (ISTE)...
January 12, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28079016/fast-hplc-fingerprinting-to-discriminate-olive-oil-from-other-edible-vegetable-oils-by-multivariate-classification-methods
#5
Ana M Jiménez-Carvelo, Antonio González-Casado, Estefanía Pérez-Castaño, Luis Cuadros-Rodríguez
A new analytical method for the differentiation of olive oil from other vegetable oils using reversed-phase LC and applying chemometric techniques was developed. A 3 cm short column was used to obtain the chromatographic fingerprint of the methyl-transesterified fraction of each vegetable oil. The chromatographic analysis took only 4 min. The multivariate classification methods used were <em>k</em>-nearest neighbors, partial least-squares (PLS) discriminant analysis, one-class PLS, support vector machine classification, and soft independent modeling of class analogies...
January 12, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28079015/chemometrics-expertise-in-the-links-between-ecotoxicity-and-physicochemical-features-of-silver-nanoparticles-environmental-aspects
#6
Miroslava A Nedyalkova, Borjana V Donkova, Vasil D Simeonov
Studies of the ecotoxicological aspects of nanomaterials in aquatic environments are scarce. Given the growing varietyof nanoparticles (NPs), along with the diversity of aquatic species and environments, the key to promoting sound risk assessment in nanoecotoxicology is understanding the mechanisms that govern the fate of NPs in aquatic environments and their behavior at the NP-biota interface. In this paper, data collected from the literature on ecotoxicological effects observed in aquatic species is discussed and analyzed using multivariate statistics techniques...
January 12, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28074742/development-and-validation-of-an-rp-hplc-method-for-the-determination-of-vinpocetine-and-folic-acid-in-the-presence-of-a-vinpocetine-alkaline-degradation-product-in-bulk-and-in-capsule-form
#7
Ehab F Elkady, Marwa H Tammam, Ayman A Mohamed
An alkaline-forced degradation hydrolytic product of vinpocetine was prepared and characterized by <sup>1</sup>H-NMR, FTIR spectroscopy, and MS. Subsequently, a simple, selective, and validated reversed-phase HPLC method was developed for the simultaneous estimation of vinpocetine and folic acid in the presence of a vinpocetine alkaline degradation product. Chromatographic separation was achieved using an isocratic mobile phase consisting of acetonitrile-0.02 M KH<sub>2</sub>PO<sub>4</sub> [containing 0...
January 11, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28074741/efficiency-of-rosemary-and-basil-essential-oils-on-the-shelf-life-extension-of-atlantic-mackerel-scomber-scombrus-fillets-stored-at-2%C3%A2-c
#8
Romdhane Karoui, Abdo Hassoun
The objective of the present study was to evaluate the impact of rosemary and basil essential oils (EOs) on the qualityof Atlantic mackerel fillets stored at 2°C up to 15 days. Atlantic mackerel (<em>Scomber scombrus</em>) fillets were periodically evaluated to assess their textural, color, physicochemical, and spectral characteristics. The results indicated that rosemary and basil treatments were effective for inhibiting the formation of total volatile basic nitrogen (TVB-N) and lipid oxidation products during storage...
January 11, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28063211/nmr-metabolomics-investigates-the-influence-of-flavonoid-enriched-rations-on-chicken-plasma
#9
Charalambos Fotakis, Dimitra Z Lantzouraki, Michael Goliomytis, Panagiotis E Simitzis, Maria Charismiadou, Stelios G Deligeorgis, Panagiotis Zoumpoulakis
The use of flavonoids as dietary supplements is well established, mainly due to their intense antioxidant and anti-inflammatory properties. In the present study, hesperidin, naringin, and vitamin E were used as additives at different concentrations in poultry rations in order to achieve meat of improved quality. NMR metabolomics was applied to chicken blood serum samples to discern whether and how the enriched rations affected the animals&#x2019; metabolic profile. Variations in the metabolic patterns according to sustenance consumption were traced by orthogonal projections to latent structures discriminant analysis (OPLS-DA) models and were attributed to specific metabolites by using S-line plots...
January 7, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28059048/application-of-multivariate-statistical-techniques-in-chromatographic-and-spectroscopic-fingerprinting-of-complex-food-and-environmental-samples
#10
Paweł K Zarzycki
No abstract text is available yet for this article.
January 6, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28055818/time-domain-nuclear-magnetic-resonance-td-nmr-and-chemometrics-for-determination-of-fat-content-in-commercial-products-of-milk-powder
#11
Paloma Andrade Martins Nascimento, Paulo Lopes Barsanelli, Ana Paula Rebellato, Juliana Azevedo Lima Pallone, Luiz Alberto Colnago, Fabíola Manhas Verbi Pereira
This study shows the use of time-domain (TD)-NMR transverse relaxation (<italic>T</italic><sub>2</sub>) data and chemometrics in the nondestructive determination of fat content for powdered food samples such as commercial dried milk products. Most proposed NMR spectroscopy methods for measuring fat content correlate free induction decay or echo intensities with the sample&#x2019;s mass. The need for the sample&#x2019;s mass limits the analytical frequency of NMR determination, because weighing the samples is an additional step in this procedure...
January 5, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28054507/determination-of-polyphenols-in-white-wines-by-liquid-chromatography-application-to-the-characterization-of-alella-catalonia-spain-wines-using-chemometric-methods
#12
Alexander Larrauri, Oscar Núñez, Santiago Hernández-Cassou, Javier Saurina
The determination of polyphenols in wines is of great interest in the field of food analysis due to health and organoleptic implications. In addition, the applicability of polyphenols as food descriptors to be used for characterization, classification, and authentication purposes is gaining popularity. In this work, a simple and reliable method based on HPLC separation in reversed-phase mode with UV-Vis detection was developed and applied to determine polyphenolic compounds in white wines. The chromatographic separation was performed using a C18 column under a methanol elution gradient and assessed by an experimental design approach...
January 5, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28088252/quantification-of-whey-protein-content-in-infant-formulas-by-sds-cge
#13
Ping Feng, Christophe Fuerer, Adrienne McMahon
Protein separation by SDS-CGE (Sodium Dodecyl Sulfate - Capillary Gel Electrophoresis) followed by UV absorption at 220nm allows quantification of major proteins in raw milk. In processed dairy samples such as skim milk powder and infant formulas, signals from individual proteins are less resolved, but caseins still migrate as one family between two groups of whey proteins. In the first group, α-Lactalbumin and β-Lactoglobulin migrate as two distinct peaks. Lactosylated adducts show delayed migration times and interfere with peak separation, but both native and modified forms, as well as other low molecular weight whey proteins, still elute before the caseins...
November 18, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/28059049/evaluation-of-the-3m%C3%A2-molecular-detection-assay-mda-2-listeria-monocytogenes-for-the-detection-of-listeria-monocytogenes-in-select-foods-and-environmental-surfaces-collaborative-study-first-action-2016-08
#14
Patrick Bird, Jonathan Flannery, Erin Crowley, James Agin, David Goins, Lisa Monteroso
The 3M<sup>™</sup> Molecular Detection Assay (MDA) 2 <em>- Listeria </em>uses loop-mediated isothermal amplification and bioluminescence detection to rapidly detect <em>Listeria </em>spp. in a broad range of food types and environmental surfaces. Using an unpaired study design, the MDA 2 - <em>Listeria </em>was compared to the U.S. Department of Agriculture Food Safety and Inspection Service <em>Microbiology Laboratory Guidebook </em>Chapter 8.09 "<em>Isolation and Identification of Listeria monocytogenes from Red Meat, Poultry, and Egg Products, and Environmental Samples</em>" reference method for the detection of <em>Listeria </em>in deli turkey and raw chicken breast fillet...
November 17, 2016: Journal of AOAC International
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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