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排序方式: 共有106条查询结果,搜索用时 46 毫秒
61.
Kobra Omidfar Solmaz Kia Soheila Kashanian Malihe Paknejad Afsaneh Besharatie Susan Kashanian Bagher Larijani 《Applied biochemistry and biotechnology》2010,160(3):843-855
Digoxin is widely used as a cardiac glycoside drug in the treatment of various heart conditions. Because it is a toxic drug, it should be regularly monitored in the serum of patients under treatment. In this study, colloidal nanogold is synthesized and the preparation of nanogold-labeled monoclonal antibody probe to digoxin is described under optimal conditions. In addition, an immunochromatographic (IC) method for digoxin analysis employing nanogold-labeled probe is developed. With this technique, it requires only 5 min to complete the quantitative detection of digoxin. The detection time is decreased 20–30 times in comparison to radioimmunoassay (RIA). The sensitivity to digoxin was about 2 ng/ml by naked eye, which is within the therapeutic and toxic ranges of digoxin. The results of serum samples obtained by IC strip were in agreement with those obtained by RIA. The IC strip was sufficiently sensitive and accurate to be used for the rapid detection of digoxin in serum samples. 相似文献
62.
Yang Liu Peng Lu Huining Xiao Solmaz Heydarifard Shuangfei Wang 《Cellulose (London, England)》2017,24(1):241-251
This article describes the preparation of novel aqueous spongy foams that are composed of three-dimensionally distributed wood-fiber networks stabilized with nanofibrillate cellulose (NFC) and/or microfibrillated cellulose (MFC). The free standing aqueous spongy foams were prepared with the entrapment of NFC and/or MFC—stabilized air-in-water (A/W) capillary foams using “gel trapping technique”. The stability of spongy foams could be controlled by manipulating the volume fraction of NFC and/or MFC and a secondary liquid immiscible with the continuous phase of the NFC and/or MFC suspension. Possible morphology and mechanical distribution of NFC and/or MFC within spongy foams were verified with optical microscope, SEM, and functional load-bearing method. Owing to three-dimensionally dispersed wood-fiber structure, ultra-lightweight (0.01–0.06 g/cm3), high porosity (>90%), and microporous (10–80 μm), the NFC and/or MFC reinforced spongy foams, improved compressional strength-vertical direction obviously, from 0.0 to more than 13.78 kPa. 相似文献
63.
Solmaz Ghaffari Nasim Sadri Alamdari Zahra Jafari Azar Ali Reza Dabir Siaghi Farzad Kobarfard Sanaz Ghaffari 《Journal of Dispersion Science and Technology》2013,34(9):1332-1335
Preparation of sustained release dosage forms is one of the main objectives in drug formulation. Theophylline that has a narrow therapeutic index, making it a good choice to prepare a sustained release dosage form. Theophylline sustained release microcapsules were prepared by applying the coacervation method. The effect of the type and ratio of polymers, as well as the type of washing solvents, was studied on particle size, drug loading efficiency, and in vitro drug release profile. Results showed that Eudragit RS and RL could be more suitable polymers for preparation of sustained release microcapsules of theophylline when used in ratio of 1:1 and when the washing solvent was hexane. 相似文献
64.
Rahmatollah Rahimi Masoumeh Mahjoub Moghaddas Solmaz Zargari 《Journal of Sol-Gel Science and Technology》2013,65(3):420-429
In order to efficient utilization of visible light in the photodegradation reaction, mesoporous vanadium doped TiO2 (V-TiO2) particles sensitized by tetrakis(4-carboxyphenyl)porphyrin (TCPP) dyes were synthesized, and characterized. For investigation of the anchoring coupling between porphyrin and TiO2 surface, two photocatalyst containing ester-like linkage (TCPP–V-TiO2) and amide-like linkage (TCPP–NH2–V-TiO2) were compared in the photodegradation of methyl orange (MO) aqueous solution. It was found that the photocatalytic activity of the TCPP–V-TiO2 was higher than TCPP–NH2–V-TiO2 (95 % compared to 62 %). Importantly, TCPP–V-TiO2 was particularly stable in the visible light photocatalytic activity after six cycles. 相似文献
65.
66.
A rapid, convenient and reliable method for microextraction in packed syringe (MEPS) of the loop diuretic furosemide (FUR) in urine along with high-performance liquid chromatography (HPLC) was developed. A nanocomposite based on silver nanoparticles/polyaniline (Ag-NPs/PANI) was synthesized and used as the MEPS packing material. This nanocomposite was prepared conveniently using interfacial polymerization without the need for any templates or functional dopants. The feasibility of the synthesized nanocomposites was examined by isolation of FUR from diluted urine samples. After extraction, the analyte was desorbed by 200 μL of methanol. It was then dried and the residue was dissolved in 30 μL of methanol and an aliquot of 25 μL was, finally, injected into the HPLC system. Important parameters influencing the extraction and desorption processes were optimized and 25 cycles of draw–eject gave maximum peak area, when desorption was performed. The linearity was studied by preconcentration of 5 mL of diluted urine sample spiked with a standard solution of FUR in the concentration range of 15–750 μg L?1. The coefficient of determination was satisfactory (r 2 > 0.99) and the relative standard deviation (RSD %) value under the optimized condition was 8.8 %. The limit of detection and limit of quantification were 7 and 15 μg L?1, respectively. 相似文献
67.
Synthesis and properties of butyl rubber–poly(ethylene oxide) graft copolymers with high PEO content
Solmaz Karamdoust Colin V. Bonduelle Ryan C. Amos Bethany A. Turowec Sharon Guo Lorenzo Ferrari Elizabeth R. Gillies 《Journal of polymer science. Part A, Polymer chemistry》2013,51(16):3383-3394
Butyl rubber‐poly(ethylene oxide) (PEO) graft copolymers with high PEO content (40–83 wt %) were synthesized by the functionalization and activation of the double bond moiety of butyl rubber containing high (7 mol %) isoprene content and subsequent reaction with PEO of different molecular weights from 750 to 5000 g/mol. The properties of these copolymers, along with other butyl rubber‐PEO graft copolymers were studied in films and in aqueous solution. Despite the high PEO content, films of the copolymers were quite stable in water with respect to mass loss and were capable of releasing an encapsulated probe molecule in a manner that was dependent on the PEO content. At high PEO content they were resistant to the adhesion and growth of C2C12 cells. Despite the resistance of films to dissolution, it was possible to prepare nanosized aqueous assemblies via a THF‐water exchange process and the sizes of the assemblies were tuned by their method of preparation. The assemblies were also able to encapsulate a probe molecule and were found to be nontoxic in vitro. Combined, this set of properties makes these new amphiphilic copolymers promising for a wide range of potential applications. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 3383–3394 相似文献
68.
M. Almasi?Kashi A. Ramazani S. Doudafkan A. S. Esmaeily 《Applied Physics A: Materials Science & Processing》2011,102(3):761-764
FeNi nanowires were fabricated by ac and pulse electrodeposition into the alumina template matrix. The effects of continuous
ac electrodeposition as well as pulse features on the structure and magnetic properties of the nanowire arrays were studied.
The microstructures and magnetic properties of the Fe
x
Ni1−x
nanowires are seen to be independent of the deposition frequency and off-time between the pulses. The ac electrodeposited
Ni nanowires were not formed at more than 400 Hz deposition frequency, while the Fe
x
Ni1−x
nanowires, containing a small amount of Fe, formed in the all frequencies. For x less than 50% the coercivity slowly increases but over 50% Fe added to the FeNi alloy increases the coercivity with a higher
rate and maximum coercivity was seen for the Fe0.97Ni0.03. The Fe and Fe
x
Ni1−x
nanowires containing less than 30 at.% Ni was seen to have a bcc structures with (110) preferential direction while Fe
x
Ni1−x
nanowires with more than 30 at.% Ni showed (110) bcc (Fe) and/or (111) bcc (FeNi) plus (111) fcc (Ni). A preferential (111)
fcc structure was obtained for the Ni nanowires. 相似文献
69.
Zahra Hassani Solmaz Adeli Dadkhoda Ghazanfari 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):1759-1769
Abstract 3,4-Dihydropyrimidin-2(1H)-thione derivatives undergo a chemoselective reaction with dialkylacetylenedicarboxylate in the presence of triphenylphosphine lead to the corresponding stable heterocyclic phosphorus ylides in good yield. In this method, a mixture of water/acetone as a green solvent was used. [Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the following free supplemental files: Additional figures] 相似文献
70.
Composition of volatile organic compounds (VOCs) in flowers of Astragalus lagopoides was studied using a hydrodistillation extraction procedure coupled with gas chromatography-mass spectrometry. The analyses allowed the identification of a number of 25 compounds, among which the presence of several bioactive aromatic derivatives such as guaiacol, eugenol, linalool, α- and 4-terpineol as well as nerol was attention-grabbing. Moreover, some other compounds like cyclohexane, 2-bromoethyl with repellent function also appeared to be present in the flower. As a result, the floral VOCs profile of A. lagopoides might reflect an adaptation to attract specialised pollinator insects. These findings provide important information for advances in understanding the ecological and evolutionary perspectives of pollination biology of the giant genus Astragalus. 相似文献