The stoichiometric accuracy and formation constants of colloidal titration: Polyelectrolyte aggregate reaction of glycolchitosan-poly(vinyl sulfate) and glycolchitosan-dodecylbenzene sulfonate.

Hattori, Toshiaki; Hattori, Sadao; Kato, Masaru

doi:10.2116/bunsekikagaku.43.777

Cited by 11 publications

(8 citation statements)

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“…As not shown in the figures, the values of β steady increased with decreasing pH. Since the values of Ki for glycolchitosan did not decrease with the pH, 16 such a decrease was quite unexpected. Glycolchitosan and ChO are apt to be easily soluble, but ChH and ChL are less soluble in aqueous solution at a neutral pH.…”

Section: Ion Association Of Chitosan-pvsmentioning

confidence: 73%

“…Glycolchitosan also demonstrated such a linear relationship, 16 but poly(vinylamine) and poly-(ethyleneimine) never indicated a regular relationship to α. 18 This indicates that chitosans have a rigid backbone of a sugar chain, and that the effects of α and the NaCl concentration can not produce a significant conformational change.…”

Section: Dissociation Constants Of Chitosansmentioning

confidence: 97%

“…11 We also measured the apparent formation constants (Ki) between glycolchitosan and PVS by the use of pH titration. 16 In a 0.1 M NaCl solution, pH titrations of glycolchitosan-PVS afforded an irreversible result. Thus, the titration curve with 0.1 M NaOH as the titrant did not quite correspond to that with 0.1 M HCl as the titrant.…”

Section: Introductionmentioning

confidence: 99%

“…We chose two ways to solve the problem: to work a flow-through pH meter and to prepare a series of sample solutions at each pH measurement. 16 Thus, continuous pH titration was abandoned, and the pH values of sample solutions individually prepared were measured separately. A potentiometric study of glycolchitosan-PVS complexes by using individual pH measurements provided some interesting information about complexation.…”

Section: Introductionmentioning

confidence: 99%

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pH-Potentiometirc Study of Polyion Complexes between Chitosan and Poly(vinyl sulfate) or Dodecylbenzene Sulfonate

Hattori

Katai

2008

ANAL. SCI.

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Polyion complexes of three chitosans with poly(vinyl sulfate) (PVS) and dodecylbenzene sulfonate (DBS) were examined by a potentiometric study that was to separately measure the pH of sample solutions individually prepared. Apparent formation constants (Ki) of ion association between the protonated amines of chitosan and the sulfates of PVS or the sulfonates of DBS were determined. The effects of pH, coexistent salt concentration, and molecular weight on the values of Ki were investigated in order to reveal the properties of the complexation. The values of Ki for chitosan-PVS were quite larger than that for chitosan-DBS. The deducing effect of the coexistent salt was strong against chitosan-PVS, but was weak against chitosan-DBS. Thus, chitosan-PVS complexes possessed a strong electrostatic binding, and chitosan-DBS complexes included a hydrophobic interaction. For chitosan-PVS complexes the effect of the coexistent salt was weaker for a high molecular weight of chitosan than for a low molecular weight.

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Section: Ion Association Of Chitosan-pvsmentioning

confidence: 73%

Section: Dissociation Constants Of Chitosansmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

pH-Potentiometirc Study of Polyion Complexes between Chitosan and Poly(vinyl sulfate) or Dodecylbenzene Sulfonate

Hattori

Katai

2008

ANAL. SCI.

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“…As a typical case, an aqueous solution of poly(diallyldimethyl ammonium) chloride (PDADMAC) can be titrated with an aqueous solution of potassium poly(vinyl sulfate) (KPVS) of known concentration. The reaction between oppositely charged polyelectrolytes has been studied on stoichiometry, 9,13-16 the stability constant, 17,18 and the effect of the polymerization degree. 19 A few colloidal titrations were applied to measure metal ions in hydrolyzed, polymeric forms.…”

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confidence: 99%

Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

et al. 2004

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Zirconium chemicals are used in a wide range of industries, and with advances in modern technology, the diversity of their applications has increased. 1 In particular, tetragonal zirconia is one of the most important zirconium compounds for ceramic use, with excellent mechanical properties, such as high structure toughness, strength, and hardness. 2 We have studied the effective use of some zirconium oxy-salts as a depressive and fluidizing material of ceramic slurries, 3,4 and have developed a new direct-casting method based on aqueous-acidic high solids loading alumina slurries stabilized with zirconium acetate. 5When the slurries were prepared, the concentration of zirconium oxy-salt was an important factor, and a simple and convenient determination of aqueous zirconium was required. However, the determination of zirconium is not very easy because zirconium(IV) has a marked tendency to form polynuclear hydroxy group-bridged zirconium species (polymerization) in aqueous solutions.6 Pilkington et al. mentioned that accurate results in EDTA titration of zirconium could only be obtained after zirconium ions were converted to a depolymerized form. Therefore, we studied a colloidal titration method as a means to measure the concentration of zirconium conveniently as it exists in the aqueous solution in a polynuclear configuration.Colloidal titration is an excellent measurement method for determining the concentration of natural and synthetic polyelectrolytes. [8][9][10][11][12] Titration is based on the reaction between a positively charged polyelectrolyte (polycation) and a negatively charged one (polyanion).When the charges of the polyelectrolytes are neutralized by the addition of oppositely charged polyelectrolytes, the two ployelectrolytes tend to associate and eventually precipitate. According to Terayama, who was the first proposer of colloidal titration, the colloidal titration method has been applied to several poly-charged species, such as proteins and cells. 8 However, their stoichiometries are still not clear. Regarding the reaction between oppositely charged polyelectrolytes, most of the reaction is accurately stoichiometric. As a typical case, an aqueous solution of poly(diallyldimethyl ammonium) chloride (PDADMAC) can be titrated with an aqueous solution of potassium poly(vinyl sulfate) (KPVS) of known concentration. The reaction between oppositely charged polyelectrolytes has been studied on stoichiometry, 9,13-16 the stability constant, 17,18 and the effect of the polymerization degree. 19 A few colloidal titrations were applied to measure metal ions in hydrolyzed, polymeric forms. Kikuchi and Kubota have investigated a chemical reaction of KPVS with a mixture of poly(aluminum chloride), PAC, ([Al2(OH)nCl6-n]m, n = 3, m = 2.5) as an inorganic macromolecule and [2-(diethylamino)ethyl]dextran hydrochloride.The general characteristics of the resultant polyelectrolyte complexes were also studied. 20 Tajima has reported that undeca(11-)tungstocobalt(II)phosphate, [PW11O39Co(H2O)] 5-, was a useful standa...

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Detection of Biopolymer ϵ-poly-L-lysine with Molybdosilicate Anion for Screening of Synthetic Enzymes

Katano

Maruyama

Hamano

2011

International Journal of Polymer Analysis and Characterization

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The stoichiometric accuracy and formation constants of colloidal titration: Polyelectrolyte aggregate reaction of glycolchitosan-poly(vinyl sulfate) and glycolchitosan-dodecylbenzene sulfonate.

Cited by 11 publications

References 0 publications

pH-Potentiometirc Study of Polyion Complexes between Chitosan and Poly(vinyl sulfate) or Dodecylbenzene Sulfonate

pH-Potentiometirc Study of Polyion Complexes between Chitosan and Poly(vinyl sulfate) or Dodecylbenzene Sulfonate

Colloidal Titration of Aqueous Zirconium Solutions with Poly(vinyl sulfate) by Potentiometric Endpoint Detection Using a Toluidine Blue Selective Electrode

Detection of Biopolymer ϵ-poly-L-lysine with Molybdosilicate Anion for Screening of Synthetic Enzymes

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