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Ultrasonics Sonochemistry

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https://www.readbyqxmd.com/read/28169126/medium-high-frequency-ultrasound-and-ozone-based-advanced-oxidation-for-amoxicillin-removal-in-water
#1
Rana Kıdak, Şifa Doğan
In this study, treatment of an antibiotic compound amoxicillin by medium-high frequency ultrasonic irradiation and/or ozonation has been studied. Ultrasonic irradiation process was carried out in a batch reactor for aqueous amoxicillin solutions at three different frequencies (575, 861 and 1141kHz). The applied ultrasonic power was 75W and the diffused power was calculated as 14.6W/L. The highest removal was achieved at 575kHz ultrasonic frequency (>99%) with the highest pseudo first order reaction rate constant 0...
January 28, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28214134/intensification-of-heterogeneously-catalyzed-suzuki-miyaura-cross-coupling-reaction-using-ultrasound-understanding-effect-of-operating-parameters
#2
Sonam V Sancheti, Parag R Gogate
Palladium-catalyzed Suzuki-Miyaura cross-coupling reaction is a significant reaction for obtaining industrially important products. The current research work deals with intensification of reaction of 4-bromoanisole and phenylboronic acid catalyzed with 5wt% Pd/C (5% by weight Pd supported on C available as commercial catalyst) using ultrasound and more importantly, without use of any additional phase transfer catalyst. Heterogeneous catalyst has been selected in the present work so as to harness the benefits of easy separation and the possible limitations of heterogeneous operation are minimized by introducing ultrasonic irradiations...
January 27, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28169125/intensification-of-delignification-and-subsequent-hydrolysis-for-the-fermentable-sugar-production-from-lignocellulosic-biomass-using-ultrasonic-irradiation
#3
Preeti B Subhedar, Pearl Ray, Parag R Gogate
The present work deals with intensification of delignification and subsequent enzymatic hydrolysis of sustainable biomass such as groundnut shells, coconut coir and pistachio shells using ultrasound assisted approach so as to develop an economical approach for obtaining bioethanol. Process intensification, in the current context, is referred to as any improvements giving enhanced rates possibly with lower energy and chemical as well as enzyme requirement for delignification and hydrolysis respectively. Conventional processing for both delignification and enzymatic hydrolysis has also been investigated for establishing the degree of intensification...
January 21, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28109677/effect-of-pulsed-ultrasound-on-the-physicochemical-characteristics-and-emulsifying-properties-of-squid-dosidicus-gigas-mantle-proteins
#4
O A Higuera-Barraza, W Torres-Arreola, J M Ezquerra-Brauer, F J Cinco-Moroyoqui, J C Rodríguez Figueroa, E Marquez-Ríos
Food technologists are always looking to improve the functional properties of proteins. In this sense, in last years ultrasound has been used to improve some functional properties. For this reason, and considering that jumbo squid is an important fishery in northwest Mexico, the purpose of this research was to determine the effect of pulsed ultrasound on the physicochemical characteristics and emulsifying properties of squid (Dosidicus gigas) mantle proteins. Pulsed ultrasound (20kHz, 20, and 40% amplitude) was applied for 30, 60, and 90s to a protein extract prepared from giant squid mantle causing an increase (p<0...
January 12, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28082012/applications-of-ultrasound-in-processing-of-liquid-foods-a-review
#5
L Paniwnyk
Ultrasonic processing of a variety of liquids, drinks and beverages has generated much interest with published literature papers increasing within this area in recent years. Benefits include enhanced emulsification with improved homogenization and fat globule size reduction being recorded. In dairy systems increased creaming rates are observed on sonication in a process known as fractionation. Whilst fruit juices exhibit retention or enhancement of quality parameters whilst increasing levels of bioactive compounds...
December 19, 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27993542/modification-of-citrus-and-apple-pectin-by-power-ultrasound-effects-of-acid-and-enzymatic-treatment
#6
Nerea Muñoz-Almagro, Antonia Montilla, F Javier Moreno, Mar Villamiel
Pectin-derived oligosaccharides are emerging as a new generation of functional ingredients with new or improved technological and/or bioactive properties as compared to pectin. This work addresses the impact of power ultrasound (US) on the structure of citrus and apple pectin under different experimental conditions of power, amplitude and pectin concentration in aqueous and acid media, as well as in the presence of a pectinase. Results indicated that depolymerisation of both pectin increased with time and intensity of US in aqueous media and their polydispersity decreased...
December 1, 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27955981/high-solids-emulsions-produced-by-ultrasound-as-a-function-of-energy-density
#7
Larissa Consoli, Guilherme de Figueiredo Furtado, Rosiane Lopes da Cunha, Míriam Dupas Hubinger
The use of emulsifying methods is frequently required before spray drying food ingredients, where using high concentration of solids increases the drying process yield. In this work, we used ultrasound to obtain kinetically stable palm oil-in-water emulsions with 30g solids/100g of emulsion. Sodium caseinate, maltodextrin and dried glucose syrup were used as stabilizing agents. Sonication time of 3, 7 and 11min were evaluated at power of 72, 105 and 148W (which represents 50%, 75% and 100% of power amplitude in relation to the nominal power of the equipment)...
December 1, 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28012791/aromatic-profile-and-sensory-characterisation-of-ultrasound-treated-cranberry-juice-and-nectar
#8
Anet Režek Jambrak, Marina Šimunek, Marinko Petrović, Helena Bedić, Zoran Herceg, Hrvoje Juretić
Ultrasonication is a nonthermal food processing technology that is used in several applications (extraction, pretreatment before drying, freezing, inactivation of microorganisms etc.). The objective of this study was to investigate the effect of high power ultrasound and pasteurisation on the aroma profile and sensory properties of cranberry juice and nectar. Samples were treated according to the experimental design, with high power sonicator at ultrasound frequency of 20kHz under various conditions (treatment time 3, 6 and 9min, sample temperature: 20, 40 and 60°C and amplitude 60, 90 and 120μm)...
November 25, 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27919669/manothermosonication-mts-treatment-of-apple-carrot-juice-blend-for-inactivation-of-escherichia-coli-0157-h7
#9
Ozan Kahraman, Hyoungill Lee, Wei Zhang, Hao Feng
This study was performed to evaluate the responses of Escherichia coli 0157:H7 inoculated in an apple-carrot blended juice to manothermosonication (MTS) treatments. The MTS treatments were conducted in a continuous-flow MTS system. The juice samples were exposed to ultrasound treatment at combinations of three temperatures (60, 50 and 40°C) and three pressure levels (100, 200, and 300kPa) for five residence times (15, 30, 45, 60, and 75s). The results showed that higher treatment temperature (i.e. 60°C) and hydrostatic pressure in the MTS system significantly enhanced the microbial reduction...
November 24, 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069244/ultrasonic-irradiation-assisted-synthesis-of-bi2s3-nanoparticles-in-aqueous-ionic-liquid-at-ambient-condition
#10
Salomé M de la Parra-Arciniega, Nora A Garcia-Gomez, Lorena L Garza-Tovar, Domingo I García-Gutiérrez, Eduardo M Sánchez
In this work, an easy, fast and environmentally friendly method to obtain Bi2S3 nanostructures with sphere-like morphology is introduced. The promising material was successfully synthesized by a sonochemical route in 20% 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO4] ionic liquid solution (IL). Morphological studies by electron microscopy (SEM and TEM) show that the use of IL in the synthesis of Bi2S3 favors the formation of nanocrystals non-agglomerated. Micro Raman and energy dispersive X-ray spectroscopy (EDXS) were used to determine the composition and purity of the synthesized material...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069243/effect-of-combined-ultrasonic-and-alkali-pretreatment-on-enzymatic-preparation-of-angiotensin-converting-enzyme-ace-inhibitory-peptides-from-native-collagenous-materials
#11
Yuhao Zhang, Liang Ma, Luyun Cai, Yi Liu, Jianrong Li
The combined effect of ultrasonic and alkali pretreatment for the hydrolysis of native collagenous materials and release of ACE inhibitory peptides was investigated. The ultrasonic and alkali pretreatment of pig skin could accelerate the release of the ACE inhibitory peptides from the triple helix of collagen in early stages of hydrolysis. Furthermore, the pretreatment could also accelerate collapse of the triple helix and release more ACE inhibitory peptides during hydrolysis than collagen samples left untreated...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069242/comparison-of-sonochemiluminescence-images-using-image-analysis-techniques-and-identification-of-acoustic-pressure-fields-via-simulation
#12
T Joyce Tiong, Tissa Chandesa, Yeow Hong Yap
One common method to determine the existence of cavitational activity in power ultrasonics systems is by capturing images of sonoluminescence (SL) or sonochemiluminescence (SCL) in a dark environment. Conventionally, the light emitted from SL or SCL was detected based on the number of photons. Though this method is effective, it could not identify the sonochemical zones of an ultrasonic systems. SL/SCL images, on the other hand, enable identification of 'active' sonochemical zones. However, these images often provide just qualitative data as the harvesting of light intensity data from the images is tedious and require high resolution images...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069241/intracellular-triggered-release-of-dna-quaternary-ammonium-polyplex-by-ultrasound
#13
Wei-Hao Liao, Ming-Yen Hsiao, Chia-Wen Lo, Hui-Shan Yang, Ming-Kuan Sun, Feng-Huei Lin, Yung Chang, Wen-Shiang Chen
2-Methacryloyloxy ethyl trimethyl ammonium chloride (TMA) is a potent polymeric plasma DNA (pDNA) carrier. The present study shows that TMA/pDNA polyplexes could be internalized into cells efficiently, but could not mediate gene transfection on its own. The transfection process of TMA/pDNA polyplexes is turned on only when ultrasound (US) was applied 4-8h after incubating TMA/pDNA polyplexes with target cells (with a gene expression 1000 times that of the immediate US group). US is a widely used physical method for gene delivery; its transfection efficiency can be significantly enhanced when combined with cationic polymer vectors...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069240/improved-synthesis-of-aluminium-nanoparticles-using-ultrasound-assisted-approach-and-subsequent-dispersion-studies-in-di-octyl-adipate
#14
S Shabana, S H Sonawane, V Ranganathan, P H Pujjalwar, D V Pinjari, B A Bhanvase, P R Gogate, Muthupandian Ashokkumar
The present work reports on an efficient and simple one pot synthetic approach for aluminium nanoflakes and nanoparticles based on the intensification using ultrasound and provides a comparison with the conventional approach to establish the cutting edge process benefits. In situ passivation of aluminium particles with oleic acid was used as the method of synthesis in both the conventional and ultrasound assisted approaches. The aluminium nanoflakes prepared using the ultrasound assisted approach were subsequently dispersed in di-octyl adipate (DOA) and it was demonstrated that a stable dispersion of aluminium nanoflakes into di-octyl adipate (DOA) is achieved...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069239/analysis-of-the-effect-of-impact-of-near-wall-acoustic-bubble-collapse-micro-jet-on-al-1060
#15
Linzheng Ye, Xijing Zhu
The bubble collapse near a wall will generate strong micro-jet in a liquid environment under ultrasonic field. To explore the effect of the impact of near-wall acoustic bubble collapse micro-jet on an aluminum 1060 sheet, the cavitation threshold formula and micro-jet velocity formula were first proposed. Then the Johnson-Cook rate correlation material constitutive model was considered, and a three-dimensional fluid-solid coupling model of micro-jet impact on a wall was established and analyzed. Finally, to validate the model, ultrasonic cavitation test and inversion analysis based on the theory of spherical indentation test were conducted...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069238/low-intensity-ultrasound-as-a-pretreatment-to-drying-of-daylilies-impact-on-enzyme-inactivation-color-changes-and-nutrition-quality-parameters
#16
Zhongyuan Zhang, Liying Niu, Dajing Li, Chunquan Liu, Rui Ma, Jiangfeng Song, Jiangtao Zhao
Effects of thermal and low intensity ultrasound combined with heat (LIUH) pretreatment prior to microwave vacuum drying on enzyme inactivation, color changes and nutrition quality properties of dried daylilies were investigated. The peroxidase (POD), ascorbic acid oxidase (AAO) and polyphenoloxidase (PPO) thermal and LIUH (0.2 and 0.4W/cm(2)) inactivation were determined and compared at 70, 80 and 90°C. Significant reduction in the POD, AAO and PPO activity was seen in daylilies after an ambient LIUH pretreatment than thermal pretreatment...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069237/nucleation-kinetics-from-metastable-zone-widths-for-sonocrystallization-of-l-phenylalanine
#17
T Hazi Mastan, Maheswata Lenka, Debasis Sarkar
This study investigates the effect of ultrasound on metastable zone width (MSZW) during crystallization of l-phenylalanine from aqueous solution. The solubility of l-phenylalanine in water was measured gravimetrically in the temperature range of 293.15-333.15K. The MSZW was measured by conventional polythermal method for four different cooling rates at five different saturation temperatures in absence and presence of ultrasound. The MSZW increased with increase in cooling rates and decreased with increase in saturation temperature...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069236/recent-advancements-in-the-sonophotocatalysis-spc-and-doped-sonophotocatalysis-dspc-for-the-treatment-of-recalcitrant-hazardous-organic-water-pollutants
#18
REVIEW
Debabrata Panda, Sivakumar Manickam
: Sonophotocatalysis (SPC) is considered to be one of the important wastewater treatment techniques and hence attracted the attention of researchers to eliminate recalcitrant hazardous organic pollutants from aqueous phase. In general, SPC refers to the integrated use of ultrasonic sound waves, ultraviolet radiation and the addition of a semiconductor material which functions as a photocatalyst. Current research has brought numerous improvements in the SPC based treatment by opting visible light irradiation, nanocomposite catalysts and numerous catalyst supports for better stability and performance...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069235/sonochemical-synthesis-of-novel-pyrano-3-4-e-1-3-oxazines-a-green-protocol
#19
Tamer S Saleh, Abdullah S Al-Bogami, Ahmed E M Mekky, Hamad Z Alkhathlan
The atom-efficient and green protocol for formation of pyrano[3,4-e][1,3]oxazines utilizing dimethyl carbonate under ultrasound irradiation in a presence of KF/basic alumina was reported. We provide a novel series of pyrano[3,4-e][1,3]oxazine derivatives interesting for biological screening tests. In general, it was found that ultrasound irradiations enable the reactions to occur which could not be carried out under silent conditions. These remarkable effects appeared in sonicated reactions can be reasonably interpreted in terms of acoustic cavitation phenomenon...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069234/ultrasonic-assisted-synthesis-of-bikitaite-zeolite-a-potential-material-for-hydrogen-storage-application
#20
Priyanka Roy, Nandini Das
Li containing Bikitaite zeolite has been synthesized by an ultrasound-assisted method and used as a potential material for hydrogen storage application. The Sonication energy was varied from 150W to 250W and irradiation time from 3h to 6h. The Bikitaite nanoparticles were characterized by X-ray diffraction (XRD), infrared (IR) spectral analysis, and field-emission scanning electron microscopy (FESEM) thermo-gravimetrical analysis and differential thermal analysis (TGA, DTA). XRD and IR results showed that phase pure, nano crystalline Bikitaite zeolites were started forming after 3h irradiation and 72h of aging with a sonication energy of 150W and nano crystalline Bikitaite zeolite with prominent peaks were obtained after 6h irradiation of 250W sonic energy...
May 2017: Ultrasonics Sonochemistry
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