Poly(vinylbenzo macrocyclic polyethers). Synthesis and cation binding properties of 12-crown-4 derivatives

1991 ◽  
Vol 69 (4) ◽  
pp. 702-705 ◽  
Author(s):  
G. W. Buchanan ◽  
J. K. Denike
Keyword(s):  
Molecular Weight ◽  
Methylene Chloride ◽  
Cation Binding ◽  
Cooperative Binding ◽  
Low Molecular Weight ◽  
Binding Properties ◽  
Macrocyclic Polyethers ◽  
Free Radical Initiator ◽  
Salt Distribution ◽  
Distribution Equilibria

The synthesis of 4′-vinylbenzo-12-crown-4 ether is reported. Polymerization to relatively low molecular weight polymers can be accomplished with a free radical initiator. A copolymer with styrene can be prepared and the Li+, Na+, and K+ binding properties of these polymers are compared to those of their monomeric analogs using salt distribution equilibria in water – methylene chloride. For all cations the homopolymer is found to extract the salts from the aqueous phase most effectively. The copolymer is slightly less effective than the homopolymer but more effective than either of the monomers by a factor of approximately 7, indicating that cooperative binding is likely. Na+ is the most efficiently extracted cation, followed by K+ and Li+. Key words: crown ether polymers, complexation properties.

scholarly journals Bioaccumulation of silver and the isolation of metal-binding protein from P.diminuta

2001 ◽  
Vol 44 (3) ◽  
pp. 223-225 ◽  
Author(s):  
Zaharah Ibrahim ◽  
Wan Azlina Ahmad ◽  
Abu Bakar Baba
Keyword(s):  
Molecular Weight ◽  
Metal Binding ◽  
Metal Uptake ◽  
Silver Ions ◽  
Low Molecular Weight ◽  
Early Exponential Phase ◽  
Binding Properties ◽  
Bacterial Cultures ◽  
Sds Page ◽  
Pseudomonas Diminuta

A silver uptake study by Pseudomonas diminuta was carried out by growing the bacteria in a chloride-free medium (CFM) containing silver ions (50 muM) in a batch culture. From the results, it was found that higher amounts of silver were accumulated inside the cell during early exponential phase compared to the amount bound at the cell surface. This suggested a possible mechanism for metal uptake during bacterial growth. In view of this, attempts were made to isolate proteins which might be associated with silver-binding properties from cultures of P.diminuta grown in the presence and absence of silver. The proteins were first extracted from the bacterial cultures by precipitation with ammonium sulfate followed by purification using isoelectric focussing and SDS-PAGE. Results of the experiment showed the presence of low molecular weight and high molecular weight proteins containing silver with pI values ranging from 2.0 to 9.0 for bacteria grown in the presence of silver.

Poly(vinyl macrocyclic polyethers). Synthesis and Cation Binding Properties

1973 ◽  
Vol 6 (1) ◽  
pp. 133-142 ◽  
Author(s):  
S. Kapolow ◽  
T. E. Hogen Esch ◽  
J. Smid
Keyword(s):  
Cation Binding ◽  
Binding Properties ◽  
Macrocyclic Polyethers

scholarly journals A low-molecular-weight ditopic MRI probe for ratiometric sensing of zwitterionic amino acid neurotransmitters

2019 ◽  
Vol 55 (79) ◽  
pp. 11924-11927 ◽  
Author(s):  
Đorđe Toljić ◽  
Goran Angelovski
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
Cooperative Binding ◽  
Low Molecular Weight ◽  
Amino Acid Neurotransmitters ◽  
Ratiometric Sensing

The capability for cooperative binding of a ditopic Gd-based responsive MRI probe was used to advance the sensitivity towards the major excitatory (Glu) and inhibitory (GABA) neurotransmitters over their physiological competitor hydrogencarbonate.

The influence of a residual group in low-molecular-weight allergoids of Artemisia vulgaris pollen on their allergenicity, IgE- and IgG-binding properties

Allergy ◽  
2002 ◽  
Vol 57 (11) ◽  
pp. 1013-1020 ◽  
Author(s):  
T. Cirkovic ◽  
M. Gavrovic-Jankulovic ◽  
S. Prisic ◽  
R. M. Jankov ◽  
L. Burazer ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Artemisia Vulgaris ◽  
Binding Properties ◽  
Igg Binding

Methods for the Synthesis of Polyethereketone

2018 ◽  
Vol 935 ◽  
pp. 27-30
Author(s):  
K.T. Shakhmurzova ◽  
Zh.I. Kurdanova ◽  
Arthur E. Baikaziev ◽  
Karina Kh. Teunova ◽  
Azamat A. Zhansitov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Aromatic Hydrocarbons ◽  
Electrophilic Substitution ◽  
Methylene Chloride ◽  
Dicarboxylic Acids ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Low Molecular Weight ◽  
Monocarboxylic Acids ◽  
Synthesis Time ◽  
Aromatic Dicarboxylic Acids

The data on the methods for the preparation of polyetherketones by electrophilic and nucleophilic methods are considered and generalized. It is shown that polyetherketones by electrophilic substitution are carried out as homopolycondensation aromatic monocarboxylic acids and their halides and polycondensation of polynuclear aromatic hydrocarbons with aromatic dicarboxylic acids or their halides, and phosgene in organic solvents (1,2-dichloroethane, methylene chloride, nitrobenzene and etc.) in the presence of Ziegler-Natt catalysts. However, this process has not found an industrial application in view of such disadvantages as low yield of the desired product, the formation of a polymer with low molecular weight, synthesis time (15-40 hours), the use of large amounts of catalyst, the complexity of polymer purification of it.

A Simple Method to Prepare Affinity Resins on Cellulose Basis

1984 ◽  
Vol 39 (11-12) ◽  
pp. 1048-1051 ◽  
Author(s):  
Karl Eisele ◽  
Fernando Dias Costa ◽  
Carlos Pascual ◽  
Beatus Ofenloch-Hähnle
Keyword(s):  
Molecular Weight ◽  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Androgen Receptors ◽  
Methylene Chloride ◽  
Solid Phase ◽  
Solid Phase Peptide Synthesis ◽  
Low Molecular Weight ◽  
Amino Acid Residues ◽  
Simple Method

Abstract Affinity resins with different spacer arms were synthesized analogues to the solid phase peptide synthesis using aminoethyl cellulose or carboxymethyl cellulose as matrix. The spacer arms could be varied in length and rigidity. Especially spacer arms consisting of poly am ino acids can be synthesized with a defined amount of amino acid residues specifically in the low molecular weight ranges. The method is also applicable to other matrices w hich are not susceptible to 1 ɴ HCl in glacial acetic acid, trethylamine, methylene chloride and dimethylformamide. The synthesis of affinity resins with different spacer arms for the purification of androgen receptors is described as an example of the method.

Cooperative binding and self-assembling behavior of cationic low molecular-weight dendrons with RNA molecules

2006 ◽  
Vol 4 (3) ◽  
pp. 581 ◽  
Author(s):  
Jiehua Zhou ◽  
Jiangyu Wu ◽  
Xiaoxuan Liu ◽  
Fanqi Qu ◽  
Mu Xiao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Cooperative Binding ◽  
Low Molecular Weight ◽  
Rna Molecules ◽  
Self Assembling

Cation Binding Properties of Poly(vinyl macrocyclic polyethers)

1971 ◽  
Vol 4 (3) ◽  
pp. 359-360 ◽  
Author(s):  
S. Kopolow ◽  
T. E. Hogen Esch ◽  
J. Smid
Keyword(s):  
Cation Binding ◽  
Binding Properties ◽  
Macrocyclic Polyethers

The Plant Toxin Victorin Binds to a Discrete Number of Proteins in All Organisms Tested

1994 ◽  
Vol 21 (2) ◽  
pp. 243 ◽  
Author(s):  
DC Loschke ◽  
LD Tomaska ◽  
H Chen ◽  
DW Gabriel ◽  
BG Rolfe
Keyword(s):  
Molecular Weight ◽  
Plant Species ◽  
Binding Proteins ◽  
Low Molecular Weight ◽  
In Vitro Experiments ◽  
Plant Toxin ◽  
Binding Properties ◽  
Saprophytic Fungus ◽  
Biological Probe

We have used the plant toxin victorin C, which is synthesised by the saprophytic fungus Cochliobolus victoria, as a biological probe. Victorin C, labelled with either 125I or 35S, bound to eight distinct proteins (victorin-binding proteins) in oat plants that were either resistant or sensitive to the toxin. Using a series of in vitro experiments, we observed a difference in the victorin-binding properties between resistant and susceptible plants. Furthermore, we found that other plant species contain a set of proteins of similar sizes which specifically bind victorin. Unexpectedly, we also found a low molecular weight victorin-binding protein present in all tested eukaryotic and prokaryotic cells.

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