Protonation behavior of cotton fabric with irreversibly adsorbed chitosan: A potentiometric titration study

Duško Čakara; Lidija Fras Zemljič; Matej Bračič; Karin Stana Kleinschek

doi:10.1016/j.carbpol.2009.04.011

Protonation behavior of cotton fabric with irreversibly adsorbed chitosan: A potentiometric titration study

Duško Čakara^*, Lidija Fras Zemljič, Matej Bračič, Karin Stana Kleinschek

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The protonation of cotton fabric with irreversibly adsorbed medical chitosan (CO-CT) was measured in aquatic medium at 0.1 M ionic strength by means of potentiometric titrations, and compared with the results obtained for pure cotton and chitosan. For CO-CT, the charging isotherm exhibits a charge reversal around pH ≈ 6.0, which is identified as the point of zero charge (PZC). The pure chitosan and the acid fraction that is present in cotton, protonate according to the one-pK model, with p K_CT = 6.3 and p K_CO = 4.7, respectively. At pH > PZC, the charge of the acid fraction in CO-CT is negative and constant, and the proton binding is attributed purely to the adsorbed chitosan. On the other hand, the cotton-bound acid exhibits a more complex protonation mechanism in CO-CT than in the pure fabric, which is evidenced as an excess positive charge at pH < PZC and a deviation from the one-pK behavior.

Original language	English
Pages (from-to)	36-40
Number of pages	5
Journal	Carbohydrate Polymers
Volume	78
Issue number	1
DOIs	https://doi.org/10.1016/j.carbpol.2009.04.011
Publication status	Published - 4 Aug 2009
Externally published	Yes

Keywords

Adsorption
Antimicrobial
Charge
Chitosan
Cotton
Medical
pH
pK
Potentiometric
Protonation
Titration

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.carbpol.2009.04.011

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title = "Protonation behavior of cotton fabric with irreversibly adsorbed chitosan: A potentiometric titration study",

abstract = "The protonation of cotton fabric with irreversibly adsorbed medical chitosan (CO-CT) was measured in aquatic medium at 0.1 M ionic strength by means of potentiometric titrations, and compared with the results obtained for pure cotton and chitosan. For CO-CT, the charging isotherm exhibits a charge reversal around pH ≈ 6.0, which is identified as the point of zero charge (PZC). The pure chitosan and the acid fraction that is present in cotton, protonate according to the one-pK model, with p KCT = 6.3 and p KCO = 4.7, respectively. At pH > PZC, the charge of the acid fraction in CO-CT is negative and constant, and the proton binding is attributed purely to the adsorbed chitosan. On the other hand, the cotton-bound acid exhibits a more complex protonation mechanism in CO-CT than in the pure fabric, which is evidenced as an excess positive charge at pH < PZC and a deviation from the one-pK behavior.",

keywords = "Adsorption, Antimicrobial, Charge, Chitosan, Cotton, Medical, pH, pK, Potentiometric, Protonation, Titration",

author = "Du{\v s}ko {\v C}akara and {Fras Zemlji{\v c}}, Lidija and Matej Bra{\v c}i{\v c} and {Stana Kleinschek}, Karin",

year = "2009",

month = aug,

day = "4",

doi = "10.1016/j.carbpol.2009.04.011",

language = "English",

volume = "78",

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journal = "Carbohydrate Polymers",

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T2 - A potentiometric titration study

AU - Čakara, Duško

AU - Fras Zemljič, Lidija

AU - Bračič, Matej

AU - Stana Kleinschek, Karin

PY - 2009/8/4

Y1 - 2009/8/4

N2 - The protonation of cotton fabric with irreversibly adsorbed medical chitosan (CO-CT) was measured in aquatic medium at 0.1 M ionic strength by means of potentiometric titrations, and compared with the results obtained for pure cotton and chitosan. For CO-CT, the charging isotherm exhibits a charge reversal around pH ≈ 6.0, which is identified as the point of zero charge (PZC). The pure chitosan and the acid fraction that is present in cotton, protonate according to the one-pK model, with p KCT = 6.3 and p KCO = 4.7, respectively. At pH > PZC, the charge of the acid fraction in CO-CT is negative and constant, and the proton binding is attributed purely to the adsorbed chitosan. On the other hand, the cotton-bound acid exhibits a more complex protonation mechanism in CO-CT than in the pure fabric, which is evidenced as an excess positive charge at pH < PZC and a deviation from the one-pK behavior.

AB - The protonation of cotton fabric with irreversibly adsorbed medical chitosan (CO-CT) was measured in aquatic medium at 0.1 M ionic strength by means of potentiometric titrations, and compared with the results obtained for pure cotton and chitosan. For CO-CT, the charging isotherm exhibits a charge reversal around pH ≈ 6.0, which is identified as the point of zero charge (PZC). The pure chitosan and the acid fraction that is present in cotton, protonate according to the one-pK model, with p KCT = 6.3 and p KCO = 4.7, respectively. At pH > PZC, the charge of the acid fraction in CO-CT is negative and constant, and the proton binding is attributed purely to the adsorbed chitosan. On the other hand, the cotton-bound acid exhibits a more complex protonation mechanism in CO-CT than in the pure fabric, which is evidenced as an excess positive charge at pH < PZC and a deviation from the one-pK behavior.

KW - Adsorption

KW - Antimicrobial

KW - Charge

KW - Chitosan

KW - Cotton

KW - Medical

KW - pH

KW - pK

KW - Potentiometric

KW - Protonation

KW - Titration

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DO - 10.1016/j.carbpol.2009.04.011

M3 - Article

AN - SCOPUS:67649784541

SN - 0144-8617

VL - 78

SP - 36

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JO - Carbohydrate Polymers

JF - Carbohydrate Polymers

IS - 1

ER -

Protonation behavior of cotton fabric with irreversibly adsorbed chitosan: A potentiometric titration study

Abstract

Keywords

ASJC Scopus subject areas

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