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https://www.readbyqxmd.com/read/29895793/microwave-metamaterial-absorber-for-non-destructive-sensing-applications-of-grain
#1
Yin Zhang, Junming Zhao, Jie Cao, Bo Mao
In this work, we propose a metamaterial absorber at microwave frequencies with significant sensitivity and non-destructive sensing capability for grain samples. This absorber is composed of cross-resonators periodically arranged on an ultrathin substrate, a sensing layer filled with grain samples, and a metal ground. The cross-resonator array is fabricated using the printed circuit board process on an FR-4 board. The performance of the proposed metamaterial is demonstrated with both full-wave simulation and measurement results, and the working mechanism is revealed through multi-reflection interference theory...
June 12, 2018: Sensors
https://www.readbyqxmd.com/read/29890173/significant-drying-time-reduction-using-microwave-assisted-freeze-drying-for-a-monoclonal-antibody
#2
Julian H Gitter, Raimund Geidobler, Ingo Presser, Gerhard Winter
Microwave-assisted freeze-drying is a rapid drying process well-known in food technology. However, little is known about its application to biologicals. In this study, we investigated the applicability and feasibility of this technology to different monoclonal antibody formulations and the influence on the resulting product properties. Moreover, one of our main objectives was to study if significant reductions in drying times could be achieved. Additionally, the effect of the drying process on the accelerated stability of a sucrose-based antibody formulation at 40 °C and 25 °C over 12 weeks was investigated...
June 8, 2018: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29884387/curcuma-longa-l-leaves-characterization-bioactive-and-antinutritional-compounds-for-use-in-human-food-in-brazil
#3
Monick Cristina Braga, Ellen Caroline Silvério Vieira, Tatianne Ferreira de Oliveira
This study evaluated the physicochemical characterization of Curcuma longa L. leaves with respect to proximate composition, mineral content, the presence of antinutritional factors, content of bioactive compounds and antioxidant capacity, and color measurements of leaves in natura and leaves subjected to microwave drying, oven drying, and freeze-drying methods. The proximate composition showed appreciable levels of protein (39.5 g.100 g-1 ), carbohydrates (44.74 g.100 g-1 ), total fiber (34.47 g.100 g-1 ), soluble fiber (22...
November 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29875754/recent-progress-in-the-chemical-synthesis-of-class-ii-and-s-glycosylated-bacteriocins
#4
REVIEW
François Bédard, Eric Biron
A wide variety of antimicrobial peptides produced by lactic acid bacteria (LAB) have been identified and studied in the last decades. Known as bacteriocins, these ribosomally synthesized peptides inhibit the growth of a wide range of bacterial species through numerous mechanisms and show a great variety of spectrum of activity. With their great potential as antimicrobial additives and alternatives to traditional antibiotics in food preservation and handling, animal production and in veterinary and medical medicine, the demand for bacteriocins is rapidly increasing...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29849639/analyses-of-essential-elements-and-heavy-metals-by-using-icp-ms-in-maternal-breast-milk-from-%C3%A5-anl%C3%A4-urfa-turkey
#5
Serap Kılıç Altun, Hikmet Dinç, Füsun Karaçal Temamoğulları, Nilgün Paksoy
Maternal breast milk is a unique biological matrix that contains essential micronutrients. Potentially heavy metals may also affect infants' health and growth through maternal breast milk. The purpose of this study was to determine and compare the essential elements and heavy metals of maternal breast milk of nursery mothers residing in Şanlıurfa province, Turkey. Maternal breast milk concentrations of sodium, magnesium, phosphorus, potassium, calcium, iron, copper, zinc, arsenic, and lead were analyzed in a random sample of the first time in urban and suburban nursery Turkish mothers ( n : 42)...
2018: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/29807708/rapid-microwave-assisted-dispersive-micro-solid-phase-extraction-of-mycotoxins-in-food-using-zirconia-nanoparticles
#6
Li-Jing Du, Chu Chu, Elisa Warner, Qiu-Yan Wang, Yu-Han Hu, Ke-Jie Chai, Jun Cao, Li-Qing Peng, Yu-Bo Chen, Juan Yang, Qi-Dong Zhang
Mycotoxins are a group of secondary fungi metabolites present in foods that cause adverse effects in humans and animals. The objective of this study was to develop and validate a reliable and sensitive method to determine the presence of fumonisin B1, aflatoxin B1, ochratoxin B, T-2 toxin, ochratoxin A and zearalenone. A rapid, effective process, which involves microwave-assisted dispersive micro-solid phase extraction (MA-d-μ-SPE), has been proposed for the extraction and detection of 6 mycotoxins in peach seed, milk powder, corn flour and beer sample matrixes, for subsequent analysis by ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (UHPLC-Q-TOF/MS)...
May 25, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29803072/green-synthesis-of-sno-2-quantum-dots-using-parkia-speciosa-hassk-pods-extract-for-the-evaluation-of-anti-oxidant-and-photocatalytic-properties
#7
Shamima Begum, Md Ahmaruzzaman
In the present study, microwave heating method was established for the biosynthesis of SnO2 Quantum dots (QDs) using Parkia speciosa Hassk pods extract. The as-synthesized quantum dots have been characterized by various techniques such as UV, XRD, EDX, TEM, HRTEM, SAED and FTIR spectroscopy. The biosynthesized SnO2 QDs was employed for the first time as an efficient photocatalyst for the degradation of a food dye, acid yellow 23 dye from aqueous phase under the UV254 light. Various parameters, such as the effect of catalyst dose, the initial concentration of acid yellow 23 dye (AY23), pH of the solution and irradiation time on the photodegradation process are also studied for efficient and better use of the synthesized SnO2 QDs as a catalyst...
May 1, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29771598/understanding-the-potential-benefits-of-thyme-and-their-derived-products-on-food-industry-and-health-from-extraction-of-high-added-value-compounds-to-the-evaluation-of-bioaccessibility-bioavailability-anti-inflammatory-and-antimicrobial-activities
#8
Jose M Lorenzo, Amin Mousavi Khaneghah, Mohsen Gavahian, Krystian Marszałek, Ismail Eş, Paulo E S Munekata, Isabel C F R Ferreira, Francisco J Barba
Natural bioactive compounds isolated from aromatic plants have been studied for centuries due to their unique characteristics that carry great importance in food, pharmaceutical, and cosmetic industry. For instance, several beneficial activities have been attributed to some specific compounds found in Thymus such as anti-inflammatory, antioxidant, antimicrobial and antiseptic properties. Moreover, these compounds are classified as Generally Recognized as Safe (GRAS). Conventional extraction processes of these compounds and their derived forms from thyme leaves are well established, however, they present some important drawbacks such as long extraction time, low yield, high solvent consumption and unfavorable effect on thermolabile compounds...
May 17, 2018: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/29757180/application-of-dielectric-constant-measurement-in-microwave-sludge-disintegration-and-wastewater-purification-processes
#9
Petra Veszelovszki Kovács, Balázs Lemmer, Gábor Keszthelyi-Szabó, Cecilia Hodúr, Sándor Beszédes
It has been numerously verified that microwave radiation could be advantageous as a pre-treatment for enhanced disintegration of sludge. Very few data related to the dielectric parameters of wastewater of different origins are available; therefore, the objective of our work was to measure the dielectric constant of municipal and meat industrial wastewater during a continuous flow operating microwave process. Determination of the dielectric constant and its change during wastewater and sludge processing make it possible to decide on the applicability of dielectric measurements for detecting the organic matter removal efficiency of wastewater purification process or disintegration degree of sludge...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29735063/enzyme-assisted-extraction-of-biomolecules-as-an-approach-to-novel-extraction-technology-a-review
#10
REVIEW
Shamraja S Nadar, Priyanka Rao, Virendra K Rathod
An interest in the development of extraction techniques of biomolecules from various natural sources has increased in recent years due to their potential applications particularly for food and nutraceutical purposes. The presence of polysaccharides such as hemicelluloses, starch, pectin inside the cell wall, reduces the extraction efficiency of conventional extraction techniques. Conventional techniques also suffer from low extraction yields, time inefficiency and inferior extract quality due to traces of organic solvents present in them...
June 2018: Food Research International
https://www.readbyqxmd.com/read/29729511/evaluating-microwave-synthesized-silver-nanoparticles-from-silver-nitrate-with-life-cycle-assessment-techniques
#11
Adarsh Bafana, Shishir V Kumar, Sila Temizel-Sekeryan, Si Amar Dahoumane, Liv Haselbach, Clayton S Jeffryes
Silver Nanoparticles (AgNPs) are well known for applications in electronics and as antimicrobial agents because of their unique optical, electrical, cytotoxic and thermal properties. These nanoparticles can be synthesized via a wide variety of techniques; however, they require the use of hazardous solvents which have very high environmental impacts. Nanoscience researchers have attempted novel synthesis routes that reduce resource requirements and use benign chemicals, while maintaining control over their unique properties...
May 2, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29724043/green-extraction-of-natural-antioxidants-from-the-sterculia-nobilis-fruit-waste-and-analysis-of-phenolic-profile
#12
Jiao-Jiao Zhang, Ya Li, Sheng-Jun Lin, Hua-Bin Li
The waste of Sterculia nobilis fruit was massively produced during food processing, which contains lots of natural antioxidants. In this study, antioxidants in the Sterculia nobilis fruit waste were extracted using the green microwave-assisted extraction (MAE) technique. The effects of five independent variables (ethanol concentration, solvent/material ratio, extraction time, temperature, and microwave power) on extraction efficiency were explored, and three major factors (ethanol concentration, extraction time, and temperature) showing great influences were chosen to study their interactions by response surface methodology...
May 2, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29707794/mechanical-and-moisture-barrier-properties-of-corn-distarch-phosphate-film-influenced-by-modified-microcrystalline-corn-straw-cellulose
#13
Xinru Shao, Haitao Sun, Ruiping Jiang, Ting Qin, Zhongsu Ma
BACKGROUND: In this paper, a novel modified microcrystalline corn straw cellulose (MMCSC) was prepared by ultrasonic/microwave-assisted treatment. Effective incorporation of MMCSC into corn distarch phosphate (CDP) based composite films were investigated. RESULTS: As the proportion of MMCSC was increased, tensile strength increased initially before decreasing, and the elongation at break always decreased. The composite film of MMCSC20 showed the lowest water vapor permeability (2...
April 29, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29700373/optimized-microwave-extraction-characterization-and-antioxidant-capacity-of-biological-polysaccharides-from-eucommia-ulmoides-oliver-leaf
#14
Jikun Xu, Huijie Hou, Jingping Hu, Bingchuan Liu
Microwave-induced technique was combined with response surface methodology for optimizing the isolation of polysaccharides from Eucommia ulmoides Oliver leaf. The maximum polysaccharides yield of 12.31% was achieved by microwave extraction at 74 °C for 15 min with a solid to liquid ratio of 1:29 g/mL, which agreed with the predicted value and was 2.9-fold higher than that of the conventional heat-reflux extraction method. The dominant bioactive constituent in extracts was chlorogenic acid (1.3-1.9%), followed by geniposidic acid (1...
April 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29689358/development-of-novel-techniques-to-extract-phenolic-compounds-from-romanian-cultivars-of-prunus-domestica-l-and-their-biological-properties
#15
Andrei Mocan, Alina Diuzheva, Simone Carradori, Vasil Andruch, Chiara Massafra, Cadmiel Moldovan, Cristian Sisea, Jacobus P Petzer, Anél Petzer, Susi Zara, Guya Diletta Marconi, Gokhan Zengin, Gianina Crișan, Marcello Locatelli
In the present work, fourteen cultivars of Prunus domestica were analysed to investigate their phenolic pattern with the purpose of using the leaves as potential resources of bioactive compounds in the pharmaceutical and food industry. Microwave-assisted extraction (MAE), dispersive liquid-liquid microextraction and sugaring-out liquid-liquid extraction techniques were optimized in order to obtain an exhaustive multi-component panel of phenolic compounds. The best phenolic-enriched recovery was achieved using MAE in water:methanol (30:70), and this procedure was further applied for quantitative analysis of phenolic compounds in real samples...
April 21, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29684799/elevated-heavy-metals-levels-in-cognitively-impaired-patients-from-pakistan
#16
Ghazala Iqbal, Wahid Zada, Abdul Mannan, Touqeer Ahmed
The deficit in the visuospatial skills, thinking, learning and memory is termed as cognitive impairment. Human exposure to heavy metals is a potential risk factor for developing cognitive impairment. This study aimed to investigate the possible association between the concentration of heavy metals and the extent of cognitive impairment. Blood samples were subjected to microwave assisted acid digestion and evaluated for metals levels using atomic absorption spectrophotometry. We measured the levels of Cu, Pb, Al, Zn, Cd and Mn in 183 patients diagnosed with cognitive impairment; mild (n = 72), moderate (n = 86) and severe (n = 25) and compared them to age-matched healthy controls (n = 90)...
April 16, 2018: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/29677636/aunp-rf-sensor-an-innovative-application-of-rf-technology-for-sensing-pathogens-electrically-in-liquids-spel-within-the-food-supply-chain
#17
Leann Lerie Matta, Saranraj Karuppuswami, Premjeet Chahal, Evangelyn C Alocilja
Rapid detection techniques of pathogenic bacteria in the liquid food supply chain are of significant research interest due to their pivotal role in preventing foodborne outbreaks, and in maintaining high standards of public health and safety. Milk and dairy products are of particular interest due to their widespread consumption across the globe. In this paper, a biosensor for detecting pathogenic bacteria in milk using dextrin-capped gold nanoparticles (d-AuNP) as labels decoded at microwave frequencies is presented...
July 15, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29673958/binary-grafted-chitosan-film-synthesis-characterization-antibacterial-activity-and-prospects-for-food-packaging
#18
Deepak Kumar, Pramendra Kumar, Jyoti Pandey
The antimicrobial binary grafted chitosan film [chit-g-Poly (An-co-Am)] was prepared by grafting of acrylonitrile and acrylamide on to chitosan via microwave initiated graft copolymerization. The grafting of acrylonitrile and acrylamide onto chitosan backbone was confirmed by FTIR, XRD, SEM and TGA/DTA/DTG analytical techniques. The binary grafted chitosan film possessed efficient antimicrobial activity against three tested strains, i.e. Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The prepared binary grafted chitosan film was tested for packaging apple and guava to prevent microbial infection and extend their shelf life...
April 17, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29656406/a-new-method-for-microwave-assisted-ethanolic-extraction-of-mentha-rotundifolia-bioactive-terpenoids
#19
María Jesús García-Sarrió, María Luz Sanz, Jesús Sanz, Azucena González-Coloma, Ana Cristina Soria
A new microwave-assisted extraction (MAE) method using ethanol as solvent has been optimized by means of a Box-Behnken experimental design for the enhanced extraction of bioactive terpenoids from Mentha rotundifolia leaves; 100°C, 5 min, 1.125 g dry sample: 10 mL solvent and a single extraction cycle were selected as optimal conditions. Improved performance of MAE method in terms of extraction yield and/or reproducibility over conventional solid-liquid extraction and ultrasound assisted extraction was also previously assessed...
April 14, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29653427/potential-of-portuguese-vine-shoot-wastes-as-natural-resources-of-bioactive-compounds
#20
Manuela M Moreira, M Fátima Barroso, João Vasconcellos Porto, M J Ramalhosa, Jaroslava Švarc-Gajić, Letícia Estevinho, Simone Morais, Cristina Delerue-Matos
Since annually a high amount of wastes is produced in vine pruning, the aim of this study was to evaluate the potential of vine shoots from two Portuguese grape varieties (Touriga Nacional - TN and Tinta Roriz - TR) to be used as a natural source of phenolic compounds. To reach this goal, three techniques were explored, namely microwave-assisted extraction (MAE), subcritical water extraction (SWE) and conventional extraction (CE). The phenolic composition of the extracts, antioxidant and biological activities were evaluated by spectrophotometry and chromatography...
September 1, 2018: Science of the Total Environment
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