Effect of oleic acid and sodium hydroxide on the solubilization of butanol-1 and 3-methyl butanol-1 in aqueous solution of sodium oleate

A convenient method to synthesize starch/lactic acid copolymer was studied in this work. Copolymer of starch graft with lactic acid (LA) was directly prepared by reaction of cornstarch with lactic acid in sodium hydroxide (NaOH) aqueous solution as a catalyst. The product was characterized by IR and WAXD, and the good adhesion between the two components has been observed by SEM. The results showed that the highest grafting degree could reach 33.60% when the graft copolymerization was carried in 0.40 mol·L-1 NaOH aqueous for 9 h at 90°C with the 1: 5~6 ratio of starch and lactic acid.

Download Full-text

Low-temperature fabrication of bunch-shaped ZnO nanowires using an sodium hydroxide aqueous solution

2010 3rd International Nanoelectronics Conference (INEC) ◽

10.1109/inec.2010.5425116 ◽

2010 ◽

Author(s):

Xiulan Hu ◽

Y. Masuda ◽

T. Ohji ◽

K. Kato

Keyword(s):

Aqueous Solution ◽

Low Temperature ◽

Sodium Hydroxide ◽

Zno Nanowires

Download Full-text

Behaviour of scleroglucan in aqueous solution containing sodium hydroxide

International Journal of Biological Macromolecules ◽

10.1016/0141-8130(87)90043-2 ◽

1987 ◽

Vol 9 (3) ◽

pp. 153-157 ◽

Cited By ~ 39

Author(s):

Shuquin Bo ◽

Michel Milas ◽

Marguerite Rinaudo

Keyword(s):

Aqueous Solution ◽

Sodium Hydroxide

Download Full-text

Unravelling the Thermal Decomposition Parameters for The Synthesis of Anisotropic Iron Oxide Nanoparticles

Nanomaterials ◽

10.3390/nano8110881 ◽

2018 ◽

Vol 8 (11) ◽

pp. 881 ◽

Cited By ~ 16

Author(s):

Geoffrey Cotin ◽

Céline Kiefer ◽

Francis Perton ◽

Dris Ihiawakrim ◽

Cristina Blanco-Andujar ◽

...

Keyword(s):

Oleic Acid ◽

Iron Oxide ◽

Iron Oxide Nanoparticles ◽

Sodium Oleate ◽

Shape Control ◽

Oxide Nanoparticles ◽

Chelating Ligand ◽

Precursor Structure ◽

Negative Effect ◽

Magnetic Resonance Imaging Mri

Iron oxide nanoparticles are widely used as a contrast agent in magnetic resonance imaging (MRI), and may be used as therapeutic agent for magnetic hyperthermia if they display in particular high magnetic anisotropy. Considering the effect of nanoparticles shape on anisotropy, a reproducible shape control of nanoparticles is a current synthesis challenge. By investigating reaction parameters, such as the iron precursor structure, its water content, but also the amount of the surfactant (sodium oleate) reported to control the shape, iron oxide nanoparticles with different shape and composition were obtained, in particular, iron oxide nanoplates. The effect of the surfactant coming from precursor was taking into account by using in house iron stearates bearing either two or three stearate chains and the negative effect of water on shape was confirmed by considering these precursors after their dehydration. Iron stearates with three chains in presence of a ratio sodium oleate/oleic acid 1:1 led mainly to nanocubes presenting a core-shell Fe1−xO@Fe3−xO4 composition. Nanocubes with straight faces were only obtained with dehydrated precursors. Meanwhile, iron stearates with two chains led preferentially to the formation of nanoplates with a ratio sodium oleate/oleic acid 4:1. The rarely reported flat shape of the plates was confirmed with 3D transmission electronic microscopy (TEM) tomography. The investigation of the synthesis mechanisms confirmed the major role of chelating ligand and of the heating rate to drive the cubic shape of nanoparticles and showed that the nanoplate formation would depend mainly on the nucleation step and possibly on the presence of a given ratio of oleic acid and chelating ligand (oleate and/or stearate).

Download Full-text

Synthesis and bioactivity of novel C2-glycosyl triazole derivatives as acetylcholinesterase inhibitors

Heterocyclic Communications ◽

10.1515/hc-2016-0163 ◽

2017 ◽

Vol 23 (3) ◽

pp. 231-236 ◽

Cited By ~ 1

Author(s):

Long Yin ◽

Lei Wang ◽

Xiu-Jian Liu ◽

Feng-Chang Cheng ◽

Da-Hua Shi ◽

...

Keyword(s):

Aqueous Solution ◽

Sodium Hydroxide ◽

Acetylcholinesterase Inhibitors ◽

Acetylcholinesterase Inhibition ◽

Inhibition Activity ◽

Triazole Derivatives ◽

Inhibitory Activities ◽

Ellman’S Method

AbstractNew C2-glycosyl triazole derivatives 6a–l were synthesized by cyclization of glycosyl acylthiosemicarbazides 5 in refluxing 3 N sodium hydroxide aqueous solution. Substrates 5 were obtained by the reaction of glycosyl isothiocyanate 3 with various hydrazides. The acetylcholinesterase (AChE) inhibitory activities of compounds 6 were tested by Ellman’s method. Compounds that exhibited over 85% inhibition were subsequently evaluated for the IC50 values. Compound 6f possesses the best acetylcholinesterase-inhibition activity with IC50 of 1.46±0.25 μg/mL.

Download Full-text

SYNTHESIS, CHARACTERIZATION AND ANTIOXIDANT ACTIVITY OF 7-HYDROXY-3',4'-DIMETHOXYFLAVONE

Indonesian Journal of Chemistry ◽

10.22146/ijc.21355 ◽

2012 ◽

Vol 12 (2) ◽

pp. 146-151 ◽

Cited By ~ 4

Author(s):

Elfi Susanti VH ◽

Sabirin Matsjeh ◽

Tutik Dwi Wahyuningsih ◽

Mustofa Mustofa ◽

Tri Redjeki

Keyword(s):

Aqueous Solution ◽

Antioxidant Activity ◽

Sodium Hydroxide ◽

Spectral Data ◽

1H Nmr ◽

13C Nmr ◽

Room Temperature ◽

Antioxidant Activities ◽

Oxidative Cyclization ◽

Dpph Method

Synthesis of flavones and their derivatives has attracted considerable attention due to their significant pharmaceutical effects. 7-hydroxy-3',4'-dimethoxyflavone has been synthesized and its antioxidant activity has been investigated. Flavone was synthesized by oxidative cyclization of chalcone. 2',4'-dihydroxy-3,4-dimethoxychalcone was prepared by Claisen-Schmidt condensation of 2,4-dihydroxyacetophenones with 3,4-dimethoxybenzaldehydes in the presence of aqueous solution of sodium hydroxide and ethanol at room temperature. Oxidative cyclization of 2',4'-dihydroxy-3,4-dimethoxychalcone was done by using I2 catalyst in DMSO to form 7-hydroxy-3',4'-dimethoxyflavone. The synthesized compounds were characterized by means of their UV-Vis, IR, 1H-NMR and 13C-NMR spectral data. The compound was tested for their antioxidant activities by DPPH method.

Download Full-text

Colorimetric Determination of Oxyphenisatin and Oxyphenisatin Diacetate in Pharmaceutical Preparations

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/47.4.688 ◽

1964 ◽

Vol 47 (4) ◽

pp. 688-692

Author(s):

Antoine Major

Keyword(s):

Aqueous Solution ◽

Organic Solvent ◽

Silver Nitrate ◽

Sodium Hydroxide ◽

Column Chromatography ◽

Sodium Hydroxide Solution ◽

Pharmaceutical Preparations ◽

Colorimetric Determination ◽

Hydroxide Solution

Abstract A method is described which will quantitatively determine 0.1 mg oxyphenisatin or the diacetate in various pharmaceutical preparations. After removal of interferences by organic solvent extractions from aqueous solution and partition column chromatography, the reaction of oxyphenisatin (diacetate) with silver nitrate in alcoholic sodium hydroxide solution produces a violet solution, which follows Beer’s law (1—15 μg per ml). The method was satisfactorily applied to the assay of commercial tablets, liquids, and powders with recoveries, as per cent found of declared, in the range 95—101%.

Download Full-text

High Encapsulation Efficiency of Magnetite Nanoparticles in Hydrophobic Polymer Microcapsules using Microsuspension Conventional Radical Polymerization

Oriental Journal Of Chemistry ◽

10.13005/ojc/350202 ◽

2019 ◽

Vol 35 (2) ◽

pp. 516-522 ◽

Cited By ~ 2

Author(s):

Jittaya Sadchaiyaphum ◽

Pongsathon Phapugrangkul ◽

Preeyporn Chaiyasat ◽

Amorn Chaiyasat

Keyword(s):

Aqueous Solution ◽

Oleic Acid ◽

Radical Polymerization ◽

Magnetite Nanoparticles ◽

Driving Force ◽

Encapsulation Efficiency ◽

Polymer Particle ◽

Polymer Shell ◽

Hydrophobic Polymer ◽

Co Precipitation

High encapsulation efficiency of magnetite nanoparticles (MNPs; Fe3O4) in microcapsules using PDVB as a hydrophobic polymer shell was successfully achieved by microsuspension conventional radical polymerization (ms CRP). MNPs were initially synthesized by co-precipitation of Fe2+/Fe3+ in a binary phase. During the nucleation of MNPs in alkaline aqueous solution existing oleic acid (OA), MNPs were coated with OA (MNPs-OA) before moving to the toluene phase with the addition of salt. At OA concentration of 0.3 wt%, most of the nucleated MNPs were hydrophobic and well dispersed in the toluene phase. Using DVB as a monomer for ms CRP, high encapsulation efficiency (92 %EE) of MNPs-OA was obtained, with low free polymer particle formation. By contrast, large amounts of free polymer particles were observed at low %EE (32%) of MNPs. The main driving force for high %EE was obtained by coating the surface of the MNPs by OA which increased hydrophobicity.

Download Full-text