Limitations of pH-potentiometric titration for the determination of the degree of deacetylation of chitosan

Balázs, Nándor; Sipos, Pál

doi:10.1016/j.carres.2006.11.016

Cited by 80 publications

(31 citation statements)

References 21 publications

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“…The resultant titration curve shows two equivalence points: the first one corresponds to the excess hydrogen chloride, while the second corresponds to the protonated chitosans. Thus, the difference between them would correspond to the free deacetylated amino groups (Balazs & Sipos, 2007;Sweidan et al, 2011). For the two equivalence points (inflection points) of the titration curve, let us determine the volume of sodium hydroxide aqueous solution employed to reach these point.…”

Section: Deacetylation Degreementioning

confidence: 99%

Physicochemical characterization of chitosan derivatives

Seoane

Abuín

Gómez‐Díaz

et al. 2013

CyTA - Journal of Food

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The present work analyses different chitosan synthesized derivatives from the point of view of their chemical structure (Fourier transform infrared spectroscopy, deacetylation degree, elemental analysis and average molecular weight) as well as different physicochemical properties such as density, kinematic and dynamic viscosity, intrinsic viscosity and surface tension. The characterization of different solutions of these solutes has a high importance due to the large potential uses of these compounds. Chitosan has low solubility in water, and for this reason, the present work has synthesized soluble chitosan derivatives. Important differences between original chitosan and synthesized derivatives have been found in different properties.Keywords: chitosan; derivatives; viscosity; surface tension El presente trabajo analiza distintos derivados sintetizados del quitosano desde el punto de vista de su estructura quı´mica (FTIR, grado de desacetilacio´n, ana´lisis elemental y peso molecular medio), ası´como de distintas propiedades fı´sico-quı´mica como son la densidad, viscosidad cinema´tica y dina´mica, viscosidad intrı´nseca y tensio´n superficial. La caracterizacio´n de las disoluciones acuosas de estos solutos tiene una elevada importancia debido al gran potencial en el uso de estos compuestos. El quitosano tiene una baja solubilidad en agua y por este motivo este trabajo ha sintetizado derivados solubles de quitosano. Se han encontrado diferencias importantes en algunas propiedades entre los resultados experimentales correspondientes al quitosano y a sus derivados.

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Section: Deacetylation Degreementioning

confidence: 99%

Physicochemical characterization of chitosan derivatives

Seoane

Abuín

Gómez‐Díaz

et al. 2013

CyTA - Journal of Food

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“…The moisture and ash contents have to be determined and the weighed chitosan mass corrected. Low grade samples are not adequately measured by potentiometric titration (Balázs & Sipos, 2007;Zhanga et al, 2011).…”

Section: Potentiometric Titrationmentioning

confidence: 99%

“…• Elemental analysis (Davies & Hayes, 1988;dos Santos et al, 2009); • Titration (Arcidiacono & Kaplan, 1992;Balázs & Sipos, 2007;de Alvarenga et al, 2010;Hattori et al, 1999;Park et al, 1983;Raymond et al, 1993;Tôei & Kohara, 1976;Zhanga et al, 2011); • Hydrolytic methods (Davies & Hayes, 1988;Nanjo et al, 1991;Niola et al, 1993;Sato et al, 1998;Zamani et al, 2008); • HPLC -Ultraviolet (Aiba, 1986;Muzzarelli & Rocchetti, 1985); • Infrared (Baxter et al, 1992;Duarte et al, 2002;Kasaai, 2008;Miya et al, 1980;Moore & Roberts, 1980;Sannan et al, 1978); • 1 H nuclear magnetic resonance (Brugnerotto et al, 2001;de Alvarenga et al, 2010;Fernandez-Megia et al, 2005;Lavertu et al, 2003;Varum et al, 1991); • CP-MAS 13 C NMR (Heux et al, 2000;Manni et al, 2010;Raymond et al, 1993); • CP-MAS 15 N NMR (Kasaai, 2009;Yu et al, 1999); • Many other methods are described in the literature but with a somewhat smaller appeal. Some of these methods are: steric exclusion chromatography (Brugnerotto et al, 2001), nitrous acid deamination (Sashiwa et al, 1991), thermal analysis (Garcia Alonso et al, 1983), gas chromatography with columns packed with chitin and chitosan (Muzzarelli et al, 1980),...…”

Section: Introductionmentioning

confidence: 99%

Characterization and Properties of Chitosan

Alvarenga¹

2011

Biotechnology of Biopolymers

124

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“…The determination of its deacetylation degree is important to characterize chitosan. The measurement methods of the deacetylation degree of chitosan include NMR, [5][6][7] IR, 8 acid base titration, 9,10 and colloidal titration. [11][12][13] Colloidal titration on which chitosan stoichiometrically reacts with potassium PVS is one of the most conventional methods.…”

Section: Introductionmentioning

confidence: 99%

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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Limitations of pH-potentiometric titration for the determination of the degree of deacetylation of chitosan

Cited by 80 publications

References 21 publications

Physicochemical characterization of chitosan derivatives

Physicochemical characterization of chitosan derivatives

Characterization and Properties of Chitosan

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

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