نتایج جستجو برای: complexation

تعداد نتایج: 6749  

Journal: :journal of physical & theoretical chemistry 2008
k. zare s. rezaienejad

in this research complexation of dioxovanadium(v) with nitrilotriacetic acid (nta) at differentionic strengths (0.1 to 1.0 mol dm-3) of sodium perchlorate as supporting electrolyte and ph rangeof 1.00-2.50 at 25 °c has been investigated by a combination of potentiometric and uvspectrophotometric measurements. stability constants of two species, v0211l- and vo2h2l havebeen calculated. ionic stre...

Journal: :research in pharmaceutical sciences 0
m singh ak tiwary g kaur

the present study was aimed at evaluating the possible use of inter polymer complexed (ipc) films of xanthan gum (xg) and cationic guar gum (cgg) for formulating domperidone bioadhesive films. formation of bonds between –coo¯ groups of xg and –n + (ch 3 ) 3 groups of cgg was evident in the ftir spectra of ipc films. bioadhesive strength of the films was evaluated employing texture analyser. wat...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1973
S R Johns R A Smith G E Hawkes J D Roberts

The pattern of (13)C and (1)H nuclear magnetic resonance (NMR) shift changes produced by complexation of cobalt and nickel acetylacetonates with amines and alcohols indicates that there is more than one mode of operation of the contact interaction. A large effect with alternating signs is important at the alpha and beta carbons, but this effect seems to be overlaid by another influence that app...

2004
P. B. Savage S. K. Holmgren J. M. Desper

Abst ra : The structure and complexation properties of macrocycles containing atoms from the second row of the periodic table (e.g., sulfur and phosphorus) have received less attention than the corresponding properties of macrocycles containing only first row atoms (e.g., oxygen and nitrogen). We describe results in two areas: macrocyclic thioethers for chelation of late transition metal ions, ...

2016
Lizeth Avendaño Martha Gledhill Eric P. Achterberg Victoire M. C. Rérolle Christian Schlosser

Citation: Avendaño L, Gledhill M, Achterberg EP, Rérolle VMC and Schlosser C (2016) Influence of Ocean Acidification on the Organic Complexation of Iron and Copper in Northwest European Shelf Seas; a Combined Observational and Model Study. Front. Mar. Sci. 3:58. doi: 10.3389/fmars.2016.00058 Influence of Ocean Acidification on the Organic Complexation of Iron and Copper in Northwest European Sh...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Jiong Zou Fenggang Tao Ming Jiang

A hydrophobic compound, which we name 3C18-Azo, containing an azo head and three 18 C alkyl chains has the capacity to form an amphiphile by capping it with a cyclodextrin (CD) by inclusion complexation. The amphiphilic compound self-assembles into vesicles in water. Optical switching of the assembly and disassembly is realized by alternating visible and UV irradiation, which causes the isomeri...

Journal: :Organic letters 2015
Sedef Karabiyikoglu Craig A Merlic

The first transannular [4 + 2] cycloaddition reactions of macrocyclic dicobalt hexacarbonyl-dienyne complexes were demonstrated. Complexes were conveniently prepared through palladium(II)-catalyzed intramolecular oxidative cyclization of bis(vinylboronate esters) followed by complexation with dicobalt octacarbonyl. Transannular [4 + 2] cycloaddition reactions of the complexes occurred at lower ...

Journal: :The Analyst 2012
Jia Liu Chengsen Zhang Jiamu Sun Hai Luo

We describe complexation reactions of insulin and other proteins with metal ions generated from the substrate surface by laser irradiation in laser desorption spray post-ionization mass spectrometry (LDSPI-MS). This particular type of complexation reaction in LDSPI-MS was investigated for the first time, which indicated that the mechanistic process of LDSPI-MS might be much more complicated tha...

Hans Peter Merkle Nastaran Nafissi Varcheh, Reza Aboofazeli, Vera Luginbuehl

Lysozyme, as a model protein, was precipitated through the formation of protein-Zn complex to micronize for subsequent encapsulation within poly (lactic-co-glycolic acid) (PLGA) microspheres. Various parameters, including pH, type and concentration of added salts and protein concentration, were modified to optimize the yield of protein complexation and precipitation. The resulting protein parti...

Journal: Journal of Nanoanalysis 2016

In this research, investigation of the adsorption isotherms and the effect of solution conditions such as pH and concentration of complexation of some amino acids with cobalt(II) nitrate six-hydrate upon multi-wall type carbon nanotube (CNT) were done. The adsorption capacity of complexation of amino acids onto the surface of carbon nanotube increased with the pH from acidic to alkaline. At pH ...

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