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Solution liquid solid

Bartosz Tylkowski, Martyna Nowak, Irene Tsibranska, Anna Trojanowska, Łukasz Marciniak, Ricard Garcia Valls, Tania Gumi, Marta Giamberini, Renata Jastrząb
BACKGROUND: This review aims to present the relevant background information and current research status in concentration of polyphenols using membrane technologies. The potential implementation of membrane separation to bioactive compounds like soluble phenolics from aqueous and organic solvent solutions is gaining increasing interest in the recent years. This review does not pretend to cover the abundant published literature on the subject, but to be representative for the observed tendencies in membrane processes applications for concentration of polyphenols derived from natural products...
October 21, 2016: Current Pharmaceutical Design
Ri-Fu Yang, Lin-Lin Geng, Hai-Qin Lu, Xiao-Dan Fan
The total flavonoids from Hemerocallis citrina baroni are regarded as a green and natural health care product with many beneficial impacts on human health. In this study, ultrasound-synergized electrostatic field extraction (UEE) of the total flavonoids (TF) from H. citrina was investigated. Significant independent variables of the extraction, including the electrostatic field, ultrasonic power, ethanol concentration and extraction time, were optimized using the Box-Behnken (BB) method, and the optimal extraction conditions were obtained by response surface methodology (RSM)...
January 2017: Ultrasonics Sonochemistry
Chengdong Zhang, Xiaoyan Chen
Dispersing carbon nanomaterials with the aid of sonication has become a widely used procedure for generating homogenous solutions. A systematic study was performed to evaluate the effects of a practical sample preparation procedure that involves mild sonication with/without low concentrations of hydrogen peroxide. Hydrogen peroxide is ubiquitously present in surface water and involved in advanced oxidation processes. Significant oxidation was observed for fullerene in the liquid phase, whereas an appreciable amount of hydrogen was covalently attached to the carbon cage of solid fullerene...
January 2017: Ultrasonics Sonochemistry
Lu Hu, Huazi Wang, Heng Qian, Chaoran Liu, Runhua Lu, Sanbing Zhang, Wenfeng Zhou, Haixiang Gao, Donghui Xu
An on-site dispersive liquid liquid microextraction base on the solidification of switchable solvent has been developed as a simple, rapid and eco-friendly sample extraction method for the fast determination of pyrethroid insecticides in aqueous samples using high-performance liquid chromatography with ultraviolet detection. In this extraction method, medium-chain saturated fatty acids (n≥10), which can rapidly solidify at low temperatures (<20°C), were investigated as switchable hydrophilic solvents...
October 11, 2016: Journal of Chromatography. A
Vincenzo Amendola, Stefano Scaramuzza, Francesco Carraro, Elti Cattaruzza
Laser ablation in liquids (LAL) emerged as a powerful technique for the synthesis of multielement nanoparticles (NPs) such as metal alloys with thermodynamically forbidden composition. Consequently, there is a great interest in expanding the current knowledge about NPs formation during LAL, in order to improve the control on product structure and to extend the range of compositions accessible by this technique. Here we performed a systematic investigation on alloy NPs formation by nanosecond LAL of Au/Fe/glass multilayers with different thickness and order of deposition...
October 13, 2016: Journal of Colloid and Interface Science
Songqing Chen, Xingxiu Qin, Weixi Gu, Xiashi Zhu
Ionic liquids-β-cyclodextrin polymer (ILs-β-CDCP) was attached on Fe3O4 nanoparticles to prepare magnetic solid phase extraction agent (Fe3O4@ILs-β-CDCP). The properties and morphology of Fe3O4@ILs-β-CDCP were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction(XRD), size distribution and magnetic analysis. A new method of magnetic solid phase extraction (MSPE) coupled to ICP-OES for the speciation of Mn(II)/Mn(VII) in water samples was established...
December 1, 2016: Talanta
Man Wang, Ping Ma, Xiaonan Xi, Lei Liu, Yabin Wen, Kangning Liu, Liang Sun, Yaxin Lu, Zheng Yin
The bioanalysis and especially the sample preparation of nucleoside drugs in complex media, such as human plasma, has been challenging due to the high polarity and high solubility of these drugs in water. Online solid phase extraction (SPE) offers significant advantages, such as automation and timesaving. Thus, several types of SPE columns have been developed for compounds with different polarities. In this study, SPE was applied to overcome the issue of sample pretreatment of nucleoside drugs in human plasma, with the final aim of establishing a robust analytical platform for drugs with similar structures...
December 1, 2016: Talanta
Xianyu Song, Shuangliang Zhao, Shenwen Fang, Yongzhang Ma, Ming Duan
The dissipative particle dynamics (DPD) method is used to investigate the adsorption behavior of PEO-PPO-PEO triblock copolymers at the liquid/solid interface. The effect of molecular architecture on the self-assembled monolayer adsorption of PEO-PPO-PEO triblock copolymers on hydrophobic surfaces is elucidated by adsorption process, film properties, adsorption morphologies, respectively. The adsorption thicknesses on hydrophobic surfaces and diffusion coefficient as well as aggregation number of Pluronic copolymers in aqueous solution observed in our simulations agree well with previous experimental and numerical observations...
October 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Bratindranath Mukherjee, Swagotom Sarker, Eric Crone, Pawan Pathak, Vaidyanathan Ravi Subramanian
This work presents a hitherto unreported approach to assemble a 1D oxide-1D chalcogenide heterostructured photoactive film. As a representative system, bismuth (Bi), a low melting point catalyst, facilitated 1D CdSe nanowires are directly grown on anodized 1D-TiO2 nanotube (T_NT). A combination of the reductive successive-ionic-layer-adsorption-reaction (R-SILAR) and the solution-liquid-solid (S-L-S) approach is implemented towards the assembly of this heterostructure, reported in this 1D-1D form for the first time...
October 20, 2016: ACS Applied Materials & Interfaces
Musfiqur Rahman, A M Abd El-Aty, Sung-Woo Kim, Sung Chul Shin, Ho-Chul Shin, Jae-Han Shim
In pesticide residue analysis, relatively low-sensitivity traditional detectors, such as UV, diode array, electron-capture, flame photometric, and nitrogen-phosphorus detectors, have been used following classical sample preparation (liquid-liquid extraction and open glass column cleanup); however, the extraction method is laborious, time-consuming, and requires large volumes of toxic organic solvents. A quick, easy, cheap, effective, rugged, and safe method was introduced in 2003 and coupled with selective and sensitive mass detectors to overcome the aforementioned drawbacks...
October 19, 2016: Journal of Separation Science
Jie Chen, Jens H Walther, Petros Koumoutsakos
The increasing power density and the decreasing dimensions of transistors present severe thermal challenges to the design of modern microprocessors. Furthermore, new technologies such as three-dimensional chip-stack architectures require novel cooling solutions for their thermal management. Here, we demonstrate, through transient heat-dissipation simulations, that a covalently bonded graphene-carbon nanotube (G-CNT) hybrid immersed in water is a promising solution for the ultrafast cooling of such high-temperature and high heat-flux surfaces...
October 19, 2016: Nanotechnology
L Mouttham, P Comizzoli
Ovarian tissue cryopreservation followed by tissue culture is a promising approach to preserving the fertility of biomedical models and endangered species. The objective of this study was to investigate the impact of exposure time to vitrification solution and presence of sucrose using different exposure temperatures and base media on intra-ovarian follicle integrity. Peripubertal ovarian cortical pieces were obtained by isolating the cortex and dissecting it into 1 × 1 × 0.2 mm(3) pieces. The cortical pieces were then exposed to equilibration solution and then vitrification solutions (VS) in one of the conditions mentioned above, plunged directly into liquid nitrogen and stored for ≥24 hr in liquid nitrogen...
October 18, 2016: Reproduction in Domestic Animals, Zuchthygiene
Jie Huang, Ning Gan, Fangying Lv, Yuting Cao, Changrong Ou, Haiqing Tang
In this work, a facile and environmentally friendly solid-phase microextraction assay based on on-fiber derivatization coupled with gas chromatography and mass spectrometry was developed for determining four nonvolatile index biogenic amines (putrescine, cadaverine, histamine and tyramine) in fish samples. In the assay, the fiber was firstly dipped into a solution with isobutyl chloroformate as derivatization reagent and isooctane as extraction solvent. Thus, a thin organic liquid membrane coating was developed...
October 18, 2016: Journal of Separation Science
Shouwen Zhang, Jie Wang, Jin Pan
CONTEXT: Baicalin has many pharmacological activities, including protective function against myocardial ischemia by antioxidant effects and free radical scavenging activity. However, its rapid elimination half-life in plasma and poor water solubility limits its clinical efficacy. OBJECTIVE: Novel baicalin-loaded PEGylated nanostructured lipid carriers (BN-PEG-NLC) were developed to improve bioavailability of BN, to prolong retention time in vivo and to enhance its protective effect...
October 17, 2016: Drug Delivery
Samuel Bernard, Mirna Chaker Bechelany, Abhijeet Lale, Vanessa Proust, Philippe Miele, Sylvie Malo, Christel Gervais
Monolith-type titanium nitride/silicon nitride nanocomposites labelled TiN/Si3N4 were prepared by reaction of polysilazanes with titanium amide, warm-pressing of the resulting polytitanosilazanes and subsequent pyrolysis of the green bodies at 1400 °C. At first, a series of polytitanosilazanes was synthesized and the role of the chemistry behind their synthesis has been studied in details by solid-state NMR, elemental analyses and molecular weight measurements. The intimate relationship between the chemistry and the processability of the single-source precursors was discussed...
October 14, 2016: Chemistry: a European Journal
Xiaodan Zhu, Chunhong Jia, Zuntao Zheng, Xiaoyuan Feng, Yue He, Ercheng Zhao
A rapid, selective and sensitive sample preparation method based on solid-phase extraction combined with dispersive liquid-liquid microextration was developed for the determination of pyrethroid pesticides in wheat and maize samples. Initially, the samples were extracted with acetonitrile and water solution followed phase separation with the salt addition. The following sample preparation involves a solid-phase extraction and dispersive liquid-liquid microextraction step which effectively provide cleanup and enrichment effects...
October 14, 2016: Journal of Separation Science
Helena Domin, Natalia Piergies, Dominika Święch, Ewa Pięta, Edyta Proniewicz
It has been suggested that the family of neuropeptide Y (NPY) peptides is a promising target for the neuroprotective therapy; therefore, knowledge of the structure of these biologically active compounds and their behavior at solid/liquid interface is important in order to design new analogues. Because there is still a lack of detailed information on the behavior of NPY and its mutated analogues at the solid/liquid interfaces, in this work surface-enhanced Raman spectroscopy (SERS) analysis was used to investigate NPY and its native NPY(3-36), NPY(13-36), and NPY(22-36) and mutated acetyl-(Leu(28,31))-NPY(24-36)C-terminal fragments, acting on Y2 receptors (Y2R), in order to determine their possible metal surface/molecule interactions...
October 5, 2016: Colloids and Surfaces. B, Biointerfaces
Lara Massai, Alessandro Pratesi, Jovana Bogojeski, Marco Banchini, Serena Pillozzi, Luigi Messori, Živadin D Bugarčić
Three Pd(II) and Pt(II) complexes with chelating mono(imidazolin-2-imine) and bis(imidazolin-2-imine) ligands i.e. [Pd(DMEAIm(iPr))Cl2] (1) (DMEAIm(iPr), 2-(1,3-diisopropyl-4,5-dimethylimidazolin-2-imine)ethan-1-dimethylamine), [Pd(DACH(Im(iPr))2)Cl2] (2) (DACH(Im(iPr))2, N,N'-(cyclohexane-1,2-diyl)bis(1,3-diisopropyl-4,5-dimethylimidazolin-2-imine)) and [Pt(DMEAIm(iPr))Cl2] (3), are evaluated here as potential cytotoxic and anticancer agents. An acceptable solution behaviour was found for the three study compounds in terms of solubility and stability...
September 30, 2016: Journal of Inorganic Biochemistry
Nan Lu, Ting Wang, Pan Zhao, Lianjun Zhang, Xiaowen Lun, Xueli Zhang, Xiaohong Hou
In the presented work, metal-organic framework (MOF) material MIL-101(Cr) (MIL, Matérial Institute Lavoisier) was used as a sorbent for vortex assisted dispersive micro-solid-phase extraction (VA-D-μ-SPE) of trace amount of metronidazole (MNZ), ronidazole (RNZ), secnidazole (SNZ), dimetridazole (DMZ), tinidazole (TNZ), and ornidazole (ONZ) in different environmental water samples. Ultra-high-performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) was used to quantify the target analytes...
October 8, 2016: Analytical and Bioanalytical Chemistry
Na Du, Xiaoyu Zhu, Ruiying Song, Shue Song, Wanguo Hou
Adsorption and aggregation of surfactants at solid-liquid interfaces were fairly well understood, but there was limited knowledge regarding the effect of the presence of a solid surface on aggregate structures in bulk solution. Except for the fatty acid system, most simple single-tailed surfactants (STSs) are well known to form micelles but not vesicles in aqueous solution. Herein, we report a novel phenomenon: with the mediation of lipophilic solid surfaces (LSSs), the zwitterionic STS lauryl sulfobetaine (LSB) formed vesicles from its micellar solution without any additives, producing a mixed solution of vesicles and micelles...
September 23, 2016: Soft Matter
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