Interaction of the low-molecular weight salts with cationic polyelectrolytes

Ghimici, Luminiţa; Drăgan, Ecaterina Stela; Popescu, Florin

doi:10.1002/(sici)1099-0488(19971130)35:16<2571::aid-polb1>3.0.co;2-t

Cited by 30 publications

(12 citation statements)

References 3 publications

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“…The polyelectrolyte characteristics that affect the polyelectrolyte solution properties are the chemical structure of the monomer units, the chain length, the charge density, the type of the ionic groups, polyelectrolyte concentration, and so forth 5–11. The counterions influence the polyelectrolyte solution properties by their size, valency and polarizability, and the water structure around the counterion 12–16. With respect to the medium properties, the ionic strength and solvent polarity may exert a significant effect on the polyelectrolyte solution 17–25.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the electrolytic conductivity measurements are rapid, inexpensive, and sensitive, being able to be carried out with a high level of confidence over a wide range of concentration, far below the overlap concentration ( c *) 4. Conductivity measurements for many synthetic polyelectrolytes have been reported,5, 6, 8, 9, 12–14, 17, 22, 24 but only a few studies on the natural polymers (such as polysaccharides) and their derivatives can be found 26–28. In recent times, a growing interest has been noticed in the study of the behavior of ionic polysaccharides in solution, taking into account their involvement in many processes in molecular biology 29.…”

Section: Introductionmentioning

confidence: 99%

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DNA damage and nucleotide excision repair capacity in healthy individuals

Slyšková

Naccarati

Polakova

et al. 2011

Environ and Mol Mutagen

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Interindividual differences in DNA repair capacity (DRC) represent an important source of variability in genome integrity and thus influence health risk. In the last decade, DRC measurement has attracted attention as a potential biomarker in cancer prediction. Aim of the present exploratory study was to characterize the variability in DNA damage and DRC on 100 healthy individuals and to identify biological, lifestyle, or genetic factors modulating these parameters. The ultimate goal was to obtain reference data from cancer-free population, which may constitute background for further investigations on cancer patients. The endogenous DNA damage was measured as a level of DNA single-strand breaks and DRC, specific for nucleotide excision repair (NER), was evaluated using modified comet assay, following the challenge of peripheral blood mononuclear cells with benzo[a]pyrene diolepoxide. Additionally, genetic polymorphisms in NER genes (XPA, XPC, XPD, and XPG) were assessed. We have observed a substantial interindividual variability for both examined parameters. DNA damage was significantly affected by gender and alcohol consumption (P = 0.003 and P = 0.012, respectively), whereas DRC was associated with family history of cancer (P = 0.012). The stratification according to common variants in NER genes showed that DNA damage was significantly modulated by the presence of the variant T allele of XPC Ala499Val polymorphism (P = 0.01), while DRC was modulated by the presence of the A allele of XPA G23A polymorphism (P = 0.048). Our results indicate the range of endogenous DNA single-strand breaks and capacity of NER in healthy volunteers as well as the role of potentially relevant confounders. Environ. Mol. Mutagen. 2011. © 2011 Wiley-Liss, Inc.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DNA damage and nucleotide excision repair capacity in healthy individuals

Slyšková

Naccarati

Polakova

et al. 2011

Environ and Mol Mutagen

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“…These interactions are strongly sensitive to some parameters such as the chain length, the charge density, the polyelectrolyte concentration, the counterion type, the ionic strength, the solvent polarity, etc. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Perhaps the most significant parameter affecting the solution properties of a polyelectrolyte is the linear charge density whose importance has been promoted by Manning in his counterion condensation theory [24,25].…”

Section: Introductionmentioning

confidence: 99%

Transport properties of some cationic polysaccharides

Ghimici¹,

Nichifor²

2006

Journal of Colloid and Interface Science

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“…The position of the sulfonic groups in CS was favorable only for the interactions with positive charges on the same polycation chain, but the sulfonic groups of Am could interact with positive charges on either the same chain or different chains, depending on the polycation concentration. The polycation concentration of 2 mM PCA 5 was lower than the critical overlap concentration of PCA 5 (0.09 g/dL), as already shown 24. That is, the probability of the intermacromolecular linkages was low in this range of concentration, and a T g could be expected for the corresponding complex.…”

Section: Discussionmentioning

confidence: 53%

Polyelectrolyte complexes. V. Solid‐state properties of some polycation/azo dye complexes controlled by the dye structure

Drăgan¹,

Ţîmpu²

2002

J. Polym. Sci. A Polym. Chem.

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The solid-state properties of some polycation/azo dye complexes according to the dye structure were studied in this work. One polycation contained about 95 mol % N,N-dimethyl-2-hydroxypropyleneammonium chloride units in the backbone (PCA 5 ), and eight azo dyes, different in either the number of sulfonic groups or their distribution, were used as opposite components. The selected azo dyes were as Crystal Scarlet, Congo Red, Crocein Scarlet MOO, Ponceau SS, Amaranth, Ponceau S, Direct Blue 1, and Direct Red 80. Information on the compensation degree of the oppositely charges was obtained by the elemental analysis of the solid-state polycation/dye complexes (the experimental contents of chlorine, nitrogen, and sulfur were compared with the calculated values). Differential scanning calorimetry was employed to probe the strength of the intermolecular interactions in the PCA 5 /dye complexes. Wide-angle X-ray diffraction was used to assess the supramolecular order of the solid-state complexes. The physical properties of the PCA 5 /azo dye complexes (the complex stoichiometry, glasstransition temperature, decomposition temperature, and degree of supramolecular order) were influenced mainly by the dye structure but also by the polycation concentration and the presence of NaCl.

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Interaction of the low-molecular weight salts with cationic polyelectrolytes

Cited by 30 publications

References 3 publications

DNA damage and nucleotide excision repair capacity in healthy individuals

DNA damage and nucleotide excision repair capacity in healthy individuals

Transport properties of some cationic polysaccharides

Polyelectrolyte complexes. V. Solid‐state properties of some polycation/azo dye complexes controlled by the dye structure

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