Formation of Through-Ring α-Cyclodextrin Complexes with α,ω-Alkanedicarboxylate Anion.Effects of the Aliphatic Chain Length and Electrostatic Factors on the Complexation Behavior

1992 ◽  
Vol 65 (1) ◽  
pp. 164-169 ◽  
Author(s):  
Midori Watanabe ◽  
Hiroshi Nakamura ◽  
Taku Matsuo
Keyword(s):  
Chain Length ◽  
Aliphatic Chain ◽  
Cyclodextrin Complexes

Suppression of Radical-Induced Lipid Peroxidation in a Model System by Alkyl Esters of Cinnamate Quaternary Ammonium Salts

2001 ◽  
Vol 56 (9-10) ◽  
pp. 878-885 ◽  
Author(s):  
Anna Krasowska ◽  
Maria Stasiuk ◽  
Malgorzata Oswiecimska ◽  
Arkadiusz Kozubek ◽  
Malgorzata Bien ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Chain Length ◽  
Alkyl Chain ◽  
Quaternary Ammonium Salts ◽  
Alkyl Chain Length ◽  
Ammonium Salts ◽  
Yeast Cells ◽  
Phenolic Antioxidants ◽  
Lipid Phase ◽  
Aliphatic Chain

AbstractThree new groups of phenolic antioxidants, quaternary ammonium salts with a phenol ring and alkyl chains of different length (pyrrolidine ethyl esters of 3,5-di-t-butyl-4-hydroxydihydrocinnamic acid n-alkoxymethylchlorides (PYE-n) or n-alkylbromides (PYA-n) and 2-dimethylaminoethyl ester n-alkylbromides (PPA-n), were synthesized. Some of them were previously found to efficiently protect yeast cells against oxidants and to inhibit the production of thiobarbituric acid-reactive substances in whole yeast cells and in isolated membrane lipids. The new antioxidants (at 1-100 μm) abolished or diminished peroxidation of oliwe oil emulsions caused by the OH•-producing Fe2+ and RO• and ROO•-producing tertbutylhydroperoxide (TBHP) and the azo compounds 2,2′-azobis-(amidinopropane)dihydronitrile (AAPH) and 1,1′-azobis-(1-cyclohexanecarbonitrile) (ACHN): all present at 10 mᴍ . The efficiency of individual both antioxidants was examined in relation to the type of lipid peroxidation inducer, the site of antioxidant incorporation into the emulsion lipid phase, the length of the alkyl chain, and the maximum concentration of effective antioxidant monomers given by its critical micelle concentration. PYA-n class compounds were highly efficient against all peroxidation inducers and their efficiency did not depend on the position of their molecules in the lipid phase and/or on the aliphatic chain length. In contrast, the efficiency of PYE-n and PPA-n class compounds depended both on the type of oxidant and on the length of their aliphatic chain. Their potency against Fe2+ and ACHN increased with increasing alkyl chain length whereas with AAPH it dropped with increasing alkyl chain length. A similar pattern was found with the action of PYE-n against TBHP whereas in the PPA-n group an extending alkyl chain reduced the anti-TBHP efficiency. These relationships may not be entirely straightforward and other factors (chemical nature of each compound, its possible interaction with fluorescent probes used for diagnostics, etc.) may play a considerable and not yet quite clear role. PPA-n class antioxidants have the lowest critical micelle concentration, which may limit their efficiency. Nevertheless, these phenolic antioxidants can be conveniently employed as highly efficient inhibitors of lipid peroxidation.

Development and Characterization of Bismaleimides Containing Aliphatic Chain for Microelectronics Application

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
J. L. Feng ◽  
C. Y. Yue ◽  
K. S. Chian
Keyword(s):  
Chain Length ◽  
Moisture Absorption ◽  
Thermomechanical Analysis ◽  
Stress And Strain ◽  
Aliphatic Chain ◽  
Melting Points ◽  
Scanning Calorimetry ◽  
Backbone Chain ◽  
Gel Temperature

AbstractA series of bismaleimide systems containing aliphatic backbone chain have been synthesized and investigated. Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), Thermomechanical analysis (TMA), rheometry and tensile test were used to characterize the thermal and mechanical properties. It was noted that backbone chain length and odd-even effect affected properties. As the chain length increases, the curing peak temperature, gel temperature of BMI all increase, but the melting point, glass transition and moisture absorption decrease. The melting points of BMI-3,5,7 reduced most significantly. The tensile properties were affected by odd even effect significantly. BMI-3,5,7 with odd number of carbons have less stress and strain than those of even ones.

β-D-Xylosidase from Penicillium wortmanni: binding and hydrolysis of alkyl and aryl 1-oxygen and 1-thio-β-D-xylopyranosides

1980 ◽  
Vol 58 (1) ◽  
pp. 5-8 ◽  
Author(s):  
F. Deleyn ◽  
M. Claeyssens ◽  
C. K. De Bruyne
Keyword(s):  
Kinetic Parameters ◽  
Chain Length ◽  
Aliphatic Chain ◽  
Displacement Mechanism ◽  
Alkyl Derivatives ◽  
Competitive Inhibitors ◽  
Steric Factors ◽  
Hydrolysis Of

The influence of the chain length in n-alkyl β-D-xylopyranosides and of the para substituents in aryl β-D-xylopyranosides on the kinetic parameters (Ka, V) for hydrolysis of these substrates by a β-D-xylosidase from Penicillium wortmanni, has been investigated. Binding of the corresponding 1-thio derivatives as competitive inhibitors (Ki) was studied for comparative purposes. For the n-alkyl substrates, a slight dependency of V on the chain length is noted, whereas the aryl β-D-xylopyranosides show nearly constant V values. The influence of the aglycon on Ka and Ki values is complex; for the n-alkyl derivatives the contribution of the hydrophobicity of the aliphatic chain seems predominant, although steric factors cannot be neglected. These results, together with previous observations, can tentatively be interpreted in terms of a double-displacement mechanism.

scholarly journals 299 Plasma lipids display increased mean aliphatic chain length in human hypertensive heart disease

2012 ◽  
Vol 4 (1) ◽  
pp. 95
Author(s):  
Matthieu Berry ◽  
Franck Desmoulin ◽  
Annie Turkieh ◽  
Fatima Smih ◽  
Clément Delmas ◽  
...  
Keyword(s):  
Heart Disease ◽  
Chain Length ◽  
Plasma Lipids ◽  
Hypertensive Heart Disease ◽  
Aliphatic Chain

Alkylated cage silsesquioxanes: a comprehensive study of thermal properties and self-assembled structure

RSC Advances ◽  
2014 ◽  
Vol 4 (66) ◽  
pp. 34981-34986 ◽  
Author(s):  
Lei Wang ◽  
Yoshihito Ishida ◽  
Rina Maeda ◽  
Masatoshi Tokita ◽  
Teruaki Hayakawa
Keyword(s):  
Thermal Properties ◽  
Chain Length ◽  
Long Range ◽  
Aliphatic Chain ◽  
Lamellar Structures ◽  
Self Assembled ◽  
Comprehensive Study

Long-range straight ordered lamellar structures with controllable feature sizes at sub-10 nm scale are created by thoroughly choosing the aliphatic chain length and branch numbers of alkylated cage silsesquioxane.

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