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https://www.readbyqxmd.com/read/30473479/structural-changes-caused-by-ultrasound-pretreatment-direct-and-indirect-demonstration-in-potato-cylinders
#1
Alberto Claudio Miano, Meliza Lindsay Rojas, Pedro Esteves Duarte Augusto
This work aimed to demonstrate the internal and external structural changes in potato cylinders caused by different times of ultrasound pretreatment. In addition, the structural changes were associated with the viscoelasticity and mass transfer. For which, potato cylinders were immersed in distilled water and pretreated with and without ultrasound (ultrasonic bath of 91 W/L and 25 kHz) up to 120 min. Then, the microstructure was evaluated by stereoscopic observation as a direct method, and by viscoelasticity and mass transfer evaluation (pigment diffusion and drying) as indirect methods...
November 15, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30463552/performance-of-a-bioglass-based-dentine-desensitizer-under-lactid-acid-exposition-an-in-vitro-study
#2
Manz Andrea Stefanie, Attin Thomas, Sener Beatrice, Sahrmann Philipp
BACKGROUND: Dentine hypersensitivity is especially frequent in patients with pronounced periodontal attachment loss. Aim of the treatment is an obstruction of the dentine tubules in order to inhibit liquid or osmotic motion, which is considered as trigger for pain sensations. Novel approaches aim for obstruction by calcium phosphate compounds in order to rely on biocompatible compounds. It was the aim of the study to optically investigate the morphology and to assess the fluid permeability of treated dentine surfaces...
November 21, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/30411896/plant-metabolomics-evaluation-of-different-extraction-parameters-for-nontargeted-uplc-esi-qtof-mass-spectrometry-at-the-example-of-white-asparagus-officinalis
#3
Marina Creydt, Maike Arndt, Daria Hudzik, Markus Fischer
The extraction of metabolites turns out to be one of the most important key factors for nontargeted metabolomics approaches as this step can significantly affect the informative value of the successive measurements. Compared to metabolomics experiments of various matrices of bacterial or mammalian origins, there are only few studies, which focus on different extraction methods for plant metabolomics analyses. In this study, various solvent extraction compositions were compared and assessed by using an UPLC-ESI-QTOF-MS strategy...
November 9, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/30388475/the-influence-of-sonication-on-the-oxidative-stability-and-nutritional-value-of-organic-dry-fermented-beef
#4
Karolina M Wójciak, Dariusz M Stasiak, Karolina Ferysiuk, Elżbieta Solska
Organic beef was dry fermented in sea salt (C) or acid whey (W). In order to test the effect of ultrasound, the W sample was subjected to sonication (U10) in an ultrasonic bath (10 min, 40 kHz, 480 W). The effect of sonication on fatty acid (FA) composition (%) and atherogenicity, thrombogenicity, hypocholesterolemic/hypercholesterolemic, peroxidistability indexes (AI, TI, h/H, and PI, respectively), thiobarbituric acid reactive substances (TBARS) value, and color parameters were investigated during ripening period (31, 62, and 93 days)...
February 2019: Meat Science
https://www.readbyqxmd.com/read/30324154/kinetics-of-antifungal-activity-of-home-generated-ozonated-water-on-candida-albicans
#5
Amirtaher Mirmortazavi, Hamidreza Rajati Haghi, Abdolmajid Fata, Hossein Zarrinfar, Hossein Bagheri, Amirhossein Mehranfard
Background and Purpose: Candida -associated denture stomatitis is one of the most common forms of oral candidiasis among denture wearers. Regarding this, the aim of the present study was to evaluate the antifungal effects of home-generated ozonated water on the adhesion of the C.  albicans attached to the surface of the denture base acrylic resins. Materials and Methods: For the purpose of the study, different concentrations of C. albicans were added to the tubes containing acrylic resin blocks, and then incubated for 2 h at 35°C...
June 2018: Advances in Medical Mycology (Iran)
https://www.readbyqxmd.com/read/30309704/development-and-evaluation-of-semi-destructive-ultrasound-assisted-extraction-method-followed-by-gas-chromatography-coupled-to-mass-spectrometry-enabling-discrimination-of-red-lipstick-samples
#6
Marta Gładysz, Małgorzata Król, Patryk Własiuk, Michał Piwowar, Grzegorz Zadora, Paweł Kościelniak
In this study, the effective and robust semi-destructive ultrasound assisted extraction (UAE) method followed by gas chromatography coupled to mass spectrometry (GC-MS) method used for analysis of red lipsticks samples was developed, optimized and evaluated. 43 red lipsticks of a very similar hue representing of 21 different manufacturers were investigated. The red lipsticks (approximately 0.05 mg) were applied on a disc (of ø 2 mm) placed on specially designed stand printed with a 3D printer. In order to optimize the main factors affecting extraction process, Doehlert experimental design with response surface methodology was applied...
November 23, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/30306505/ascorbic-acid-effectively-improved-lutein-extraction-yield-from-australian-sweet-lupin-flour
#7
Maria V Chandra-Hioe, Jenny Elvira, Jayashree Arcot
Lutein is a xanthophyll, a bioactive phytochemical that presents itself as colourful pigments in plants. Australian sweet lupin flour has been incorporated as a food ingredient in wheat bread and pasta to improve their sensory property and nutritional quality. However, the amount of lutein in lupin flour has not yet been determined. This is the first study to quantify naturally occurring lutein in Australian sweet lupin flour after the extraction efficiency was optimised. Several organic solvents (acetone, isopropyl alcohol, ethyl acetate and hexane), the use of an ultrasonic bath or a probe, the need for saponification and addition of ascorbic acid (served as antioxidant) were tested to compare the extraction yield...
October 10, 2018: Plant Foods for Human Nutrition
https://www.readbyqxmd.com/read/30228390/development-of-an-extraction-method-for-the-determination-of-inorganic-anions-chloride-sulfate-and-phosphate-in-edible-oils-from-different-origins-by-ion-chromatography
#8
Adriana Fernández Campos, Ricardo J Cassella
The present work reports the development of ion chromatography conductivity based detection analytical method for the determination of some inorganic anions (chloride, sulfate and phosphate) in vegetable oils. The analytes were extracted from samples prior to injection into the chromatographic system, employing a simple two-step procedure. In the first step, 4.5 g of the sample was vigorously mixed with 15 mL of deionized water and then mixed for 15 min on a horizontal roller. Afterwards, the mixture was sonicated for 15 min in an ultrasonic bath...
October 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/30218866/gammahydroxybutyrate-in-hair-of-non-ghb-and-repeated-ghb-users-a-new-and-optimized-method
#9
Nicolas Van Elsué, Cleo L Crunelle, Cor A Verbrugge, Kim van Baarle, Anaïs Rodrigues, Hugo Neels, Michel Yegles
Gamma-hydroxybutyric acid (GHB) is a short-chain fatty acid used recreationally as a drug of abuse due its strong suppressive effect on the central nervous system. The detection window of GHB in blood and urine is very narrow (t1/2=30min) but can be substantially prolonged using alternative matrices such as hair. We here present a newly developed and limited validated method with a solid phase extraction (SPE) using GC-MS/MS to determine concentrations of GHB in hair samples. The soft extraction technique (water and 90min ultrasonic bath) preserves GHB with a high yield and clean extracts...
October 2018: Forensic Science International
https://www.readbyqxmd.com/read/30199106/the-influence-of-ultrasound-and-cultivar-selection-on-the-biocompounds-and-physicochemical-characteristics-of-dried-blueberry-vaccinium-corymbosum-l-snacks
#10
Karolina Celejewska, Monika Mieszczakowska-Frąc, Dorota Konopacka, Tomasz Krupa
The aim of the study was to characterize physical and chemical composition of four highbush blueberry cultivars ("Bluecrop," "Late Blue," "Chandler," and "Elliot"). The assessment of ultrasound influence at the osmotic dehydration step and during hybrid drying on mass transfer and the nutritional quality of all cultivars was also done. The experiment consisted of two stages: (1) initial: optimization of osmotic dehydration procedure, (2) the main experiment including all stages of dried blueberry production (pretreatment, osmotic dehydration chosen in the initial stage, and drying)...
September 2018: Journal of Food Science
https://www.readbyqxmd.com/read/30177494/low-intensity-sonosynthesis-of-iron-carbide-iron-oxide-core-shell-nanoparticles
#11
A I Argüelles-Pesqueira, N M Diéguez-Armenta, A K Bobadilla-Valencia, S K Nataraj, A Rosas-Durazo, R Esquivel, M E Alvarez-Ramos, Roberto Escudero, P Guerrero-German, J A Lucero-Acuña, P Zavala-Rivera
Here we demonstrate a simple method for the organic sonosynthesis of stable Iron Carbide@Iron Oxide core-shell nanoparticles (ICIONPs) stabilized by oleic acid surface modification. This robust synthesis route is based on the sonochemistry reaction of organometallic precursor like Fe(CO)5 in octanol using low intensity ultrasonic bath. As obtained, nanoparticles diameter sizes were measured around 6.38 nm ± 1.34 with a hydrodynamic diameter around 25 nm and an estimated polydispersity of 0.27. Core-Shell structure of nanoparticles was confirmed using HR-TEM and XPS characterization tools in which a core made up of iron carbide (Fe3 C) and a shell of magnetite (γ-Fe2 O3 ) was found...
December 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30091523/uv-photodetectors-based-on-biocl-nanosheet-arrays-the-effects-of-morphologies-and-electrode-configurations
#12
Weixin Ouyang, Longxing Su, Xiaosheng Fang
A facile chemical bath method is adopted to grow bismuth oxychloride (BiOCl) nanosheet arrays on a piece of Cu foil (denoted as BiOCl-Cu) and isolated BiOCl nanosheets are collected by ultrasonication. A self-supporting BiOCl film is obtained by the removal of Cu foil. Photodetectors (PDs) based on these BiOCl materials are assembled and the effects of morphologies and electrode configurations on the photoelectric performance of these PDs are examined. The BiOCl nanosheet PD achieves high responsivities in the spectral range from 250 to 350 nm, while it presents quite a small photocurrent and slow response speed...
September 2018: Small
https://www.readbyqxmd.com/read/30080551/the-effect-of-high-energy-environments-on-the-structure-of-laccase-polymerized-poly-catechol
#13
Jing Su, Tarsila G Castro, Jennifer Noro, Jiajia Fu, Qiang Wang, Carla Silva, Artur Cavaco-Paulo
The laccase polymerization of catechol was performed using different reactors namely a water bath (WB), an ultrasonic bath (US) and a high-pressure homogenizer (HPH). The total content of free OH and the MALDI-TOF spectra of polymers obtained demonstrated that reactions are favored in the presence of high-energy environments. Higher conversion yields and polymerization degrees (DP) were obtained after polymerization using US or HPH. Molecular dynamic simulation studies supported these findings by revealing a more open enzyme active site upon environments with high molecular agitation...
November 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30058319/all-solution-processed-perovskite-quantum-dots-light-emitting-diodes-based-on-the-solvent-engineering-strategy
#14
Kaiyu Yang, Fushan Li, Yang Liu, Zhongwei Xu, Qianqian Li, Kai Sun, Lichun Qiu, Qunying Zeng, Zhixin Chen, Wei Chen, Wanzhen Lin, Hailong Hu, Tailiang Guo
Perovskite quantum dots (PeQDs) have emerged as a new kind of nanomaterial in various applications, especially light-emitting diodes (LEDs). However, the synthesis of PeQDs is relatively complicated and the electron transport layer (ETL) is usually fabricated in a vacuum because of the dissolution of PeQDs films in organic solvents, which will increase the difficulty and cost in mass production. Here, a simple one-step "ultrasonic bath" treatment to synthesis PeQDs is adopted and applied into the PeQDs-LEDs...
August 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30047558/stability-degradation-impurities-and-decomposition-kinetics-for-paliperidone-from-osmotic-tablets
#15
José Pedro Etchepare Cassol, Fábio de Souza Barbosa, Cássia V Garcia, Andreas S L Mendez
The antipsychotic paliperidone was investigated with a focus on stability, degradation impurities and kinetics reaction profile. Osmotic tablets 3 mg (OROS® ) were subjected to extraction in an ultrasonic bath and the resulting acidic solution was stressed by forced conditions. Degraded samples were monitored by HPLC-DAD in different storage times for acidic and alkaline hydrolysis, oxidation, heat and photolysis. Photolysis was shown to be a strong degradation factor, with a drug content of 24.64% remaining after 24 h...
November 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/30029381/dual-frequency-ultrasound-assisted-enzyme-digestion-coupled-with-atomic-fluorescence-spectrometry-as-a-green-and-efficient-tool-for-cadmium-detection-in-rice-flour-samples
#16
Li-Ming Qin, Xin-An Yang, Di Leng, Wang-Bing Zhang
A sample treatment technique based on a duel frequency ultrasonic device for enzymatic digestion of rice is reported. The ultrasonic device combines a high intensity ultrasonic probe and the temperature control function of ultrasonic water bath, which can effectively extract cadmium from rice within only 160 s under the optimized conditions. Compared with the traditional ultrasonic assisted enzymatic digestion, the new method not only shortens the time significantly (e.g., from the 90 min of ultrasonic water bath to the present few minutes), but also increases the extraction efficiency of cadmium (such as ~ 75% from ultrasonic probe to app...
October 1, 2018: Talanta
https://www.readbyqxmd.com/read/29978596/curcumin-and-fisetin-internalization-into-saccharomyces-cerevisiae-cells-via-osmoporation-impact-of-multiple-osmotic-treatments-on-the-process-efficiency
#17
F G M Medeiros, R T P Correia, S Dupont, L Beney, M R S Pedrini
Cell osmoporation is a simple and straightforward procedure of creating food-grade biocapsules. This study proposes a new protocol of sequential cell osmoporation stages and evaluates its impact on the efficiency of curcumin and fisetin internalization into Saccharomyces cerevisiae cells. To the best of our knowledge, this is the first report in the literature regarding the subject. To assess how multiple osmoporation stages influence the encapsulation efficiency (% EE), encapsulated amount of curcumin (IC) and fisetin (IF) into S...
October 2018: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29966394/electrochemical-deposition-and-nucleation-growth-mechanism-of-ni%C3%A2-co%C3%A2-y%C3%A2-o%C3%A2-multiple-coatings
#18
Xinyu Zhou, Yiyong Wang, Zhipeng Liang, Hui Jin
Ni⁻Co alloy and Ni⁻Co⁻Y₂O₃ multiple coatings refined with nano-Y₂O₃ particles were fabricated by ultrasonic-assisted electrochemical deposition in an acid sulfamate bath. Linear sweep voltammetry (LSV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) techniques were applied to investigate the nucleation/growth process of composite coatings in co-deposition. The LSV results indicated that the incorporation of nano-Y₂O₃ particles with the Ni⁻Co matrix shifted the initial deposition potential to a more positive potential and decreased cathodic polarization...
July 1, 2018: Materials
https://www.readbyqxmd.com/read/29959088/characterization-of-the-suspension-stability-of-pharmaceuticals-using-a-shadowgraphic-imaging-method
#19
Hui Wang, Penny Tan, David Barona, Grace Li, Susan Hoe, David Lechuga-Ballesteros, David S Nobes, Reinhard Vehring
A new shadowgraphic imaging method and an associated instrument for analyzing the physical stability of pharmaceutical suspensions are introduced in this paper. The new suspension tester consists mainly of a high-resolution camera that takes sequential shadowgraphic images of emulsions or suspensions and a 2D collimated LED for simultaneous whole-sample illumination in bright field. A built-in ultrasonic bath provides controlled initial agitation to the samples of interest. Sequential images acquired by the experimental setup were used to derive normalized transmission profiles from which an instability index was developed for quantitative stability comparison between samples...
September 5, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29948708/polycyclic-aromatic-hydrocarbons-phthalates-parabens-and-other-environmental-contaminants-in-dust-and-suspended-particulates-of-algiers-algeria
#20
Lyes Rabhi, Abdelkader Lemou, Angelo Cecinato, Catia Balducci, Nabila Cherifi, Riad Ladji, Noureddine Yassaa
Chemicals such as polycyclic aromatic hydrocarbons (PAHs), phthalateesters, parabens, siloxanes and squalene, all of them classified as endocrine-disrupting chemicals (EDCs), have been reported to occur in all environmental compartments. The effects of EDCs on development, reproduction, growth, metabolism and obesity constitute a real public health issue. A list of EDCs (> 40 compounds) were characterised in total suspended particulates (outdoor soot: 92 samples) collected in July-September 2016 in an Algiers urban area; besides, settled indoor dusts (36 samples) were collected between November and December 2016 in schools, homes, manufacture and hospital of the same province...
August 2018: Environmental Science and Pollution Research International
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