Stiffness of chitosan in solution through intrinsic viscosity measurements
Chitosan is the partially deacetylated derivative from chitin. It is very significant to understand the behavior of chitosan as a polyelectrolyte, since most of chitosan final applications are related with its aqueous solutions. In this research, hydrodynamic parameters are studied for samples of c...
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| Format: | Article |
| Language: | English |
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Universidad de Antioquia
2012-12-01
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| Series: | Revista Facultad de Ingeniería Universidad de Antioquia |
| Subjects: | |
| Online Access: | https://revistas.udea.edu.co/index.php/ingenieria/article/view/14005 |
| _version_ | 1797861625445744640 |
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| author | Carmiña Gartner Betty Lucy López |
| author_facet | Carmiña Gartner Betty Lucy López |
| author_sort | Carmiña Gartner |
| collection | DOAJ |
| description |
Chitosan is the partially deacetylated derivative from chitin. It is very significant to understand the behavior of chitosan as a polyelectrolyte, since most of chitosan final applications are related with its aqueous solutions. In this research, hydrodynamic parameters are studied for samples of chitosan with different degree of acetylation (DA) and molecular weight, to gain insight into the behavior of this polymer at different concentrations and ionic strengths (I). To achieve this, chitosan with an initial molecular weight of 226 kD and 30% DA, was depolymerized and deacetylated to obtain different molecular weights and DA. Relative viscosities were measured by rotational rheometry to caculate the overlap concentration (C*) and the entanglement concentration (Ce). These two concentrations allowed us to establish the dilute and concentrated solution regimes. Intrinsic viscosity ([h]) was measured for each sample in acetic acid 0,3 M solution using four levels of I. These measurements were used to calculate the salt tolerance factor (S) and the stiffness parameter (B). [h] measurements were also used to estimate Mark-Howink-Kuhn-Sakurada a factor, and statistical parameters such as the persistence length, the Kuhn length and the radius of gyration. These results provide an approximation to the conformation and stiffness of chitosan chains. It was found that variations in DA do not cause conformational changes, but modifications of molecular weight can dramatically transform the stiffness of the chain. These results will be used for optimizing the preparation of biocompatible membranes.
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| first_indexed | 2024-04-09T22:06:13Z |
| format | Article |
| id | doaj.art-7ea104246bcd4d048b0ecb2e133c7083 |
| institution | Directory Open Access Journal |
| issn | 0120-6230 2422-2844 |
| language | English |
| last_indexed | 2024-04-09T22:06:13Z |
| publishDate | 2012-12-01 |
| publisher | Universidad de Antioquia |
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| series | Revista Facultad de Ingeniería Universidad de Antioquia |
| spelling | doaj.art-7ea104246bcd4d048b0ecb2e133c70832023-03-23T12:36:40ZengUniversidad de AntioquiaRevista Facultad de Ingeniería Universidad de Antioquia0120-62302422-28442012-12-0153Stiffness of chitosan in solution through intrinsic viscosity measurementsCarmiña Gartner0Betty Lucy López1University of AntioquiaUniversity of Antioquia Chitosan is the partially deacetylated derivative from chitin. It is very significant to understand the behavior of chitosan as a polyelectrolyte, since most of chitosan final applications are related with its aqueous solutions. In this research, hydrodynamic parameters are studied for samples of chitosan with different degree of acetylation (DA) and molecular weight, to gain insight into the behavior of this polymer at different concentrations and ionic strengths (I). To achieve this, chitosan with an initial molecular weight of 226 kD and 30% DA, was depolymerized and deacetylated to obtain different molecular weights and DA. Relative viscosities were measured by rotational rheometry to caculate the overlap concentration (C*) and the entanglement concentration (Ce). These two concentrations allowed us to establish the dilute and concentrated solution regimes. Intrinsic viscosity ([h]) was measured for each sample in acetic acid 0,3 M solution using four levels of I. These measurements were used to calculate the salt tolerance factor (S) and the stiffness parameter (B). [h] measurements were also used to estimate Mark-Howink-Kuhn-Sakurada a factor, and statistical parameters such as the persistence length, the Kuhn length and the radius of gyration. These results provide an approximation to the conformation and stiffness of chitosan chains. It was found that variations in DA do not cause conformational changes, but modifications of molecular weight can dramatically transform the stiffness of the chain. These results will be used for optimizing the preparation of biocompatible membranes. https://revistas.udea.edu.co/index.php/ingenieria/article/view/14005chitosan stiffnesschain conformation intrinsic viscosityrheology |
| spellingShingle | Carmiña Gartner Betty Lucy López Stiffness of chitosan in solution through intrinsic viscosity measurements Revista Facultad de Ingeniería Universidad de Antioquia chitosan stiffness chain conformation intrinsic viscosity rheology |
| title | Stiffness of chitosan in solution through intrinsic viscosity measurements |
| title_full | Stiffness of chitosan in solution through intrinsic viscosity measurements |
| title_fullStr | Stiffness of chitosan in solution through intrinsic viscosity measurements |
| title_full_unstemmed | Stiffness of chitosan in solution through intrinsic viscosity measurements |
| title_short | Stiffness of chitosan in solution through intrinsic viscosity measurements |
| title_sort | stiffness of chitosan in solution through intrinsic viscosity measurements |
| topic | chitosan stiffness chain conformation intrinsic viscosity rheology |
| url | https://revistas.udea.edu.co/index.php/ingenieria/article/view/14005 |
| work_keys_str_mv | AT carminagartner stiffnessofchitosaninsolutionthroughintrinsicviscositymeasurements AT bettylucylopez stiffnessofchitosaninsolutionthroughintrinsicviscositymeasurements |