Some regularities of action of homogeneous synthetic polymeric catalysts, analogues of enzymes

Pshezhetskii, V.S.; Lukyanova, A.P.; Kabanov, V.A.

doi:10.1016/0304-5102(77)80004-7

Cited by 13 publications

(6 citation statements)

References 14 publications

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“…DNS-Gly/Bz-75 DNS/Bz-75 15.9 (515) 15.7 (520) 18.3 (508) 17.4» (517)* 22.7 (490) 23.0 (498) 21.7C (487)' 21.7 (498) 15.1 (520) 16.2 (520) 22.0 (504) 20.6 (505) 0 Cp = 1.0 x 10'2M,at25°C.6 Cp = 3.0 X lO^M.' Cp = 2.0 X 10"3 M.…”

Section: Dns-c12-i8mentioning

confidence: 99%

“…20 Pshezhetskii et al observed the high hydrolysis activity of the linear poly(ethyleneimine) with only the secondary amino group (1-PEI) when the long alkyl chain and benzyl groups are incorporated within it. 21,22 In this context, poly(allylamine) (PAA)23-26 is thought to be a promising material in which various substituent groups can be introduced through chemical modification, yielding a variety of functions. We have already reported that PAA has a greater ability for ester hydrolysis than b-PEI, and the introduction of /3-cyclodextrin into PAA produces both selectivity and catalytic activity of the specific substrates.26-28 As alkylated PAA produced considerable acceleration, it was thought that the inclusion of small substrate molecules was enhanced by the domain formed from alkyl side groups.…”

Section: Introductionmentioning

confidence: 99%

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Self-organization of poly(allylamine)s having hydrophobic groups and its effect on the interaction with small molecules. 2. Fluorescence lifetime and ESR techniques

Seo¹,

Take²,

Akimoto³

et al. 1991

Macromolecules

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Nanosecond fluorescence lifetime and ESR techniques were used to investigate the interaction of poly(ally1amine)s (PAA) containing long alkyl or benzyl groups with fluorescent probes in an aqueous solution. The fluorescence decay curve was deconvoluted into two components: lifetimes 71 = 14-22 ns and 72 = 3-5 ns are assigned to the probes in the hydrophobic sphere of the amphiphilic polycation and in bulk water, respectively. The rotational correlation times (7R) for the spin probe were also obtained as greater than 10 ns and approximately 0.1 ns, respectively. The compact polymer domain is formed in alow concentration range (approximately lo-' M) and keeps its structure up to the higher concentration range. The values of T I increase with an increase in the chain length and the content of substituent groups. This result suggests that the lower the polarity of the domain, the greater the restriction of the probe located in the domain. The dodecylated PAA has a hard core in the interior of the domain, which loosens with a decrease in pH. On the other hand, the domain structure of the benzylated PAA has better sterical adaptability for probe molecules.The mobility of the probe was estimated to be lower in such a polymer assembly than in micelles formed from small surfactants.

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Section: Dns-c12-i8mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-organization of poly(allylamine)s having hydrophobic groups and its effect on the interaction with small molecules. 2. Fluorescence lifetime and ESR techniques

Seo¹,

Take²,

Akimoto³

et al. 1991

Macromolecules

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“…Supramolecular systems based on surfactants and polymers attract wide attention from researchers in the fields of colloid and polymer chemistry, catalysis, ecology, biology, etc. − Polyethyleneimines (PEIs) attract particular interest due to their application in the oil industry, genetic engineering, analytic chemistry, pharmacology, medicine, etc. − There are a number of publications on the surface and solution behavior of the PEI-based systems. − In the PEI + surfactant systems aggregation is found to occur in a different way depending on the solution pH, the surfactant type, and the molecular mass and architecture of PEI. In the case of cationic surfactants (CSs) only their complexes with polyanions have been intensively studied, ,, while interactions with uncharged polymers and the more so with cationic polyelectrolytes have been scarcely explored, with the exception of a few studies − focused on the formation of mesostructured thin films at the water/PEI + CTAB solution interface.…”

Section: Introductionmentioning

confidence: 99%

Polyethyleneimine + Cationic Surfactant Systems: Self-Organization and Reactivity Study

et al. 2010

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The aggregation behavior and catalytic activity toward nucleophilic substitution in p-nitrophenyl acetate of the polyethyleneimine (PEI) + cationic surfactant systems is studied. The values of the critical aggregation concentrations are shown to be much lower as compared to critical micelle concentrations of single solutions. A decrease in the self-diffusion coefficient of surface-active ions is observed within the concentration range limited by the tensiometry critical points. The data obtained provide evidence for mixed aggregation in the PEI + cationic surfactant systems. Due to the contribution of specific interactions, surfactants with hydroxyethylated head groups cetyldimethyl(2-hydroxyethyl)ammonium bromide and cetylmethylbis(2-hydroxyethyl)ammonium bromide demonstrate a higher affinity toward PEI as compared to cetyltrimethylammonium bromide. The systems studied show catalytic activity toward the cleavage of p-nitrophenyl acetate, which increasees with the number of hydroxyethyl fragments in their head groups and reaches more than 2 orders of magnitude.

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“…They explained the activity as caused by a compact structure similar to that of globular proteins. 34,35 It is worthwhile mentioning that b-PEI has primary, secondary, and tertiary amino groups whereas 1-PEI has only a secondary amino group in the main chain.…”

Section: Introductionmentioning

confidence: 99%

Self-organization of poly(allylamine)s containing hydrophobic groups and its effect on the interaction with small molecules. 1. Static fluorometry

Seo¹,

Take²,

Miwa³

et al. 1991

Macromolecules

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Some regularities of action of homogeneous synthetic polymeric catalysts, analogues of enzymes

Cited by 13 publications

References 14 publications

Self-organization of poly(allylamine)s having hydrophobic groups and its effect on the interaction with small molecules. 2. Fluorescence lifetime and ESR techniques

Self-organization of poly(allylamine)s having hydrophobic groups and its effect on the interaction with small molecules. 2. Fluorescence lifetime and ESR techniques

Polyethyleneimine + Cationic Surfactant Systems: Self-Organization and Reactivity Study

Self-organization of poly(allylamine)s containing hydrophobic groups and its effect on the interaction with small molecules. 1. Static fluorometry

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