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https://www.readbyqxmd.com/read/28087999/identification-of-irradiated-foodstuffs-using-esr-microwave-saturation
#1
Canan Aydaş, Semra Tepe Çam
This study aims primarily to investigate the usage of differences in microwave (MW) saturation behaviour of food samples for identification of radiation treatment. Twenty different samples (dry plant, herbal, spice etc.) which do not have radiation specific satellite ESR signal were especially selected. It is not possible to detect radiation treatment on these samples by European standard (EN 1787, 2000). MW saturation studies were performed on all samples in the range of 0.01-160mW. Our experimental results demonstrate that radiation identification can be possible for ten samples and cannot be possible for the other ten samples by performing the MW saturation studies...
December 29, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28071003/new-model-for-colour-kinetics-of-plum-under-infrared-vacuum-condition-and-microwave-drying
#2
Reza Amiri Chayjan, Behnam Alaei
BACKGROUND: Quality of dried foods is affected by the drying method and physiochemical changes in tissue. The drying method affects properties such as colour. The colour of processed food is one of the most important quality indices and plays a determinant role in consumer acceptability of food materials and the processing method. The colour of food materials can be used as an indirect factor to determine changes in quality, since it is simpler and faster than chemical methods. METHODS: The study focused on the kinetics of colour changes of plum slices, under infrared vacuum and microwave conditions...
April 2016: Acta Scientiarum Polonorum. Technologia Alimentaria
https://www.readbyqxmd.com/read/28067117/furan-in-commercial-baby-foods-from-the-spanish-market-estimation-of-daily-intake-and-risk-assessment
#3
M S Altaki, F J Santos, L Puignou, M T Galceran
The occurrence of furan in commercial baby food samples from the Spanish market was evaluated using an automated headspace solid-phase microextraction method coupled to gas chromatography-mass spectrometry (HS-SPME-GC-MS). A total of seventy six baby food samples including infant formula, baby cereals, fruit in cans and/or jars, vegetables, meat, and fish, were surveyed for furan content. The lowest concentration of this compound was found in infant formula (<0.02 - 0.33 ng mL(-1)), and cereal-based food (0...
January 9, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28052202/selenylation-of-polysaccharide-from-the-sweet-potato-and-evaluation-of-antioxidant-antitumor-and-antidiabetic-activities
#4
Bo Yuan, Xu-Qin Yang, Meng Kou, Chang-Yan Lu, Yuan-Yuan Wang, Jun Peng, Ping Chen, Ji-Hong Jiang
Interest in sweet potato as a functional food is growing. A polysaccharide (SWP) was isolated from the sweet potato tuber and elucidation of its structure as composed of rhamnose, glucose, and galactose undertaken. To improve its activity, selenylation of this novel polysaccharide (Se-SWP) was undertaken by using microwave synthesis. In vitro evaluation showed that the Se-SWP has excellent antioxidant activity on scavenging free radicals and reducing capacity. In vivo antitumor evaluation showed selenylation polysaccharide could effectively inhibit tumor growth (>50%) and adjust immune factor levels in the mice (IL-2, TNF-α, and VEGF)...
January 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28043835/mitigation-of-enniatins-in-edible-fish-tissues-by-thermal-processes-and-identification-of-degradation-products
#5
J Tolosa, G Font, J Mañes, E Ferrer
Emerging mycotoxins, such as enniatins and beauvericin, are common contaminants in vegetal matrices, but recently, the occurrence of mycotoxins in foodstuffs from animal origin has been also reported as they can be present in edible tissues of animals fed with contaminated feedstuffs. Sea bass, sea bream, Atlantic salmon and rainbow trout from aquaculture analyzed in the present survey showed contamination by emerging Fusarium mycotoxins enniatins (ENs). ENs were extracted from raw and cooked fish with acetonitrile and analyzed by Liquid Chromatography coupled to Mass Spectrometry...
December 31, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28042845/overall-quality-of-fruits-and-vegetables-products-affected-by-the-drying-processes-with-the-assistance-of-vacuum-microwaves
#6
REVIEW
Adam Figiel, Anna Michalska
The seasonality of fruits and vegetables makes it impossible to consume and use them throughout the year, thus numerous processing efforts have been made to offer an alternative to their fresh consumption and application. To prolong their availability on the market, drying has received special attention as currently this method is considered one of the most common ways for obtaining food and pharmaceutical products from natural sources. This paper demonstrates the weakness of common drying methods applied for fruits and vegetables and the possible ways to improve the quality using different drying techniques or their combination with an emphasis on the microwave energy...
December 30, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27992653/frequency-distribution-in-domestic-microwave-ovens-and-its-influence-on-heating-pattern
#7
Donglei Luan, Yifen Wang, Juming Tang, Deepali Jain
In this study, snapshots of operating frequency profiles of domestic microwave ovens were collected to reveal the extent of microwave frequency variations under different operation conditions. A computer simulation model was developed based on the finite difference time domain method to analyze the influence of the shifting frequency on heating patterns of foods in a microwave oven. The results showed that the operating frequencies of empty and loaded domestic microwave ovens varied widely even among ovens of the same model purchased on the same date...
December 19, 2016: Journal of Food Science
https://www.readbyqxmd.com/read/27991961/method-validation-for-determination-of-metals-in-vitis-labrusca-l-grapevine-leaf-extracts-by-inductively-coupled-plasma-mass-spectrometry-icp-ms
#8
Liane V V Bokowski, Roberto B Sobrinho, Cristián J V Armijo, Caroline Dani, João A P Henriques, Cláudia Funchal
Vitis labrusca L. is the main species used for wine and juice production in Brazil. The grapevine leaves can be used both as functional foods and as cheapest sources for the extraction of phenolic compounds. Besides the antioxidant activity, grapevine leaves exhibited significant anti-inflammatory activity. Therefore, the aim of this study was to develop and validate an analytical methodology to determine the metals selenium (96Se), chromium (53Cr), nickel (62Ni), cadmium (111Cd) and lead (206Pb) in 30 samples of grapevine leaf extracts (Vitis labrusca, Bordo cultivar) using inductively coupled plasma mass spectrometry (ICP-MS)...
October 2016: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/27979106/a-new-separation-and-preconcentration-method-for-selenium-in-some-foods-using-modified-silica-gel-with-2-6-diamino-4-phenil-1-3-5-triazine
#9
Durali Mendil, Zafer Demirci, Ozgur Dogan Uluozlu, Mustafa Tuzen, Mustafa Soylak
A novel and simple solid phase extraction method was improved and recommended for selenium. Silica gel was modified with 2,6-diamino-4-phenil-1,3,5-triazine and characterized by FTIR, SEM and elemental analysis and used adsorbent for column solid phase extraction of selenium ions. The experimental parameters (pH, flow rates, amounts of the modified silica gel, concentration and type of eluent, volume of sample, etc.) on the recoveries of selenium were optimized. Standard reference materials were analyzed for validation of method...
April 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27931180/characterisation-of-food-contact-non-stick-coatings-containing-tio2-nanoparticles-and-study-of-their-possible-release-into-food
#10
Viviana Golja, Goran Dražić, Martina Lorenzetti, Janja Vidmar, Janez Ščančar, Maša Zalaznik, Mitjan Kalin, Saša Novak
Novel nanoparticles containing non-stick coatings have been developed for food contact applications such as frying pans. Possible release of nanoparticles from such coatings into food is not known. In this paper, the characterisation of commercially available non-stick coatings was performed by use of FTIR, electron and optical microscopy, EDXS and XRD analysis. Characterisation revealed that the coatings contained micron- and nanosized rutile TiO2 particles, and quartz SiO2 embedded in a silicone polymer matrix...
December 9, 2016: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/27914031/a-simple-spectrofluorimetric-method-for-iron-determination-with-a-chalcone-based-schiff-base
#11
Nurhayat Özbek, Hakan Alp, Gonca Çelik, Tuğba Ak, Osman Can Çağılcı, Nurettin Yaylı, Ümmühan Ocak, Miraç Ocak
A chalcone-based Schiff base (5), capable of detecting iron (III) in partially aqueous media, has been designed, then synthesized by the condensation of 3-formyl-2-hydroxyquinoline and acetophenone. To determine iron (III) ion, a simple spectrofluorimetric method was developed by using the synthesized Schiff base. The developed method was validated by analyzing the certified reference material (CRM-SA-C Sandy Soil C). During the process of the determination of iron in food samples, satisfactory accuracy was obtained for spinach and rocket...
December 2, 2016: Journal of Fluorescence
https://www.readbyqxmd.com/read/27885803/rapid-and-sensitive-determination-of-phytosterols-in-functional-foods-and-medicinal-herbs-by-using-uhplc-ms-ms-with-microwave-assisted-derivatization-combined-with-dual-ultrasound-assisted-dispersive-liquid-liquid-microextraction
#12
Jing Sun, Xian-En Zhao, Jun Dang, Xiaoyan Sun, Longfang Zheng, Jinmao You, Xiao Wang
In this work, a hyphenated technique of dual ultrasound-assisted dispersive liquid-liquid microextraction combined with microwave-assisted derivatization followed by ultra high performance liquid chromatography tandem mass spectrometry has been developed for the determination of phytosterols in functional foods and medicinal herbs. Multiple reaction monitoring mode was used for the tandem mass spectrometry detection. A mass spectrometry sensitive reagent, 4'-carboxy-substituted rosamine, has been used as the derivatization reagent for five phytosterols, and internal standard diosgenin was used for the first time...
November 25, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27861962/quality-assessment-of-dried-okara-as-a-source-of-production-of-gluten-free-flour
#13
María V Ostermann-Porcel, Ana N Rinaldoni, Laura T Rodriguez-Furlán, Mercedes E Campderrós
BACKGROUND: Okara is a by-product of soymilk and of tofu elaboration that is rich in protein, fiber and vegetable oils as a source of gluten-free flour. In order to take advantage of the nutritional characteristics of okara and to be able to determine an appropriate drying methodology, microwave, rotary dryer and freeze-drying were assessed. Furthermore, flour with an enzymatic treatment was characterized as well as its functional, physicochemical, and textural properties. RESULTS: The results showed that the physiochemical characteristics of the flour were affected by the drying process, reaching adequate water content, and high protein and fiber content...
November 9, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27853264/a-simple-design-for-microwave-assisted-digestion-vessel-with-low-reagent-consumption-suitable-for-food-and-environmental-samples
#14
Mehrdad Gholami, Shima Behkami, Sharifuddin Md Zain, Sezgin Bakirdere
The objective of this work is to prepare a cost-effective, low reagent consumption and high performance polytetrafluoroethylene (PTFE) vessel that is capable to work in domestic microwave for digesting food and environmental samples. The designed vessel has a relatively thicker wall compared to that of commercial vessels. In this design, eight vessels are placed in an acrylonitrile butadiene styrene (ABS) holder to keep them safe and stable. This vessel needs only 2.0 mL of HNO3 and 1.0 mL H2O2 to digest 100 mg of biological sample...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27829931/tunable-microwave-assisted-method-for-the-solvent-free-and-catalyst-free-peracetylation-of-natural-products
#15
Manuela Oliverio, Paola Costanzo, Monica Nardi, Carla Calandruccio, Raffaele Salerno, Antonio Procopio
Background: The peracetylation is a simple chemical modification that can be used to enhance the bioavailability of hydrophilic products and to obtain safe and stable pro-drugs. Results: A totally green, solvent-free and catalyst-free microwave (MW)-assisted method for peracetylation of natural products such as oleuropein, alpha-hederin, quercetin and rutin is presented. By simply tuning the MW heating program, polyols with chemical diverse -OH groups or thermolabile functionalities can be peracetylated to improve the biological activity without degradation of the natural starting molecules...
2016: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27813309/microalgae-amino-acid-extraction-and-analysis-at-nanomolar-level-using-electroporation-and-capillary-electrophoresis-with-laser-induced-fluorescence-detection
#16
Reine Nehmé, Carla Atieh, Syntia Fayad, Bérengère Claude, Agnès Chartier, Mona Tannoury, Fatma Elleuch, Slim Abdelkafi, Chantal Pichon, Philippe Morin
Amino acids play a key role in food analysis, clinical diagnostics, and biochemical research. Capillary electrophoresis with laser-induced fluorescence detection was used for the analysis of several amino acids. Amino acid labeling with fluorescein isothiocyanate was conducted using microwave-assisted derivatization at 80°C (680 W) during only 150 s. Good electrophoretic resolution was obtained using a background electrolyte composed of sodium tetraborate buffer (100 mM; pH 9.4) and β-cyclodextrin (10 mM), and the limits of quantification were 3-30 nM...
November 4, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27763542/green-extraction-from-pomegranate-marcs-for-the-production-of-functional-foods-and-cosmetics
#17
Raffaella Boggia, Federica Turrini, Carla Villa, Chiara Lacapra, Paola Zunin, Brunella Parodi
The aim of this study was to investigate the potential of retrieving polyphenolic antioxidants directly from wet pomegranate marcs: the fresh by-products obtained after pomegranate juice processing. These by-products mainly consist of internal membranes (endocarp) and aril residues. Even if they are still edible, they are usually discharged during juice production and, thus, they represent a great challenge in an eco-sustainable industrial context. Green technologies, such as ultrasound assisted extraction (UAE) and microwave assisted extraction (MAE), have been employed to convert these organic residues into recycled products with high added value...
October 18, 2016: Pharmaceuticals
https://www.readbyqxmd.com/read/27741363/effects-of-microwave-and-ultrasound-assisted-extraction-on-the-recovery-of-soy-proteins-for-soy-allergen-detection
#18
Amma Amponsah, Balunkeswar Nayak
The extraction of soy proteins for soy allergen detections is conventionally achieved with PBS buffer for at least 2 h at room temperature or 4 °C. This method has been reported to be inefficient due to time consumption and inadequate protein extraction resulting in false negative allergen detection and mislabeling of foods containing allergenic proteins. This study investigated the application of microwave (MAE) and ultrasound assisted extraction (UAE) techniques to extract and improve recovery of allergens from various soy matrices...
October 14, 2016: Journal of Food Science
https://www.readbyqxmd.com/read/27737547/thermo-alkaline-treatment-as-a-practical-degradation-strategy-to-reduce-indospicine-contamination-in-camel-meat
#19
Eddie T T Tan, Ken W L Yong, Siew-Hoon Wong, Bruce R D'Arcy, Rafat Al Jassim, James J De Voss, Mary T Fletcher
Ingestion of indospicine-contaminated camel and horse meat has caused fatal liver injury to dogs in Australia, and it is currently not known if such contaminated meat may pose a human health risk upon dietary exposure. To date, indospicine-related research has tended to focus on analytical aspects, with little information on post-harvest management of indospicine-contaminated meat. In this study, indospicine degradation was investigated in both aqueous solution and also contaminated meat, under a range of conditions...
November 9, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27720479/two-cases-of-thermal-burns-of-the-larynx-in-older-men
#20
Yukiyoshi Hyo, Kenji Fukutsuji, Hisaki Fukushima, Tamotsu Harada
Cases of thermal burns of the larynx in infants and in patients with mental illness have been reported, but those in older people are rare. We report two cases of thermal burns of the larynx in older people caused by ingestion of microwave-heated food (meat and potato stew or a bean-jam filled bun). Both patients were users of full dentures. Conservative therapy was effective in one patient, while tracheotomy was performed in the other patient at the time of the initial examination. Hot food is expelled from the mouth as a reflective response, preventing thermal burns of the larynx...
October 6, 2016: Auris, Nasus, Larynx
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