Study of Surfactant (Benzyldimethylhexadecylammonium Chloride) Effect on Selected Properties of Hydrogels
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Petra Herdová
, Zuzana Vitková und Jarmila Oremusová
Abstract
This paper aims to provide analysis of the influences of concentration changes of the surfactant – benzyldimethylhexadecylammonium chloride in hydrogels on their liberation, rheological, association and solubility properties. The hydrogels contained constant amounts of the gel-creating basis (polymer chitosan – 2.5 % w/w), the drug (chlorhexidine dihydrochloride – 0.1 % w/w) and the surfactant, which was used as an enhancer (0.005 – 0.05 % w/w). The highest value of the released drug corresponded to the highest surfactant concentration in the hydrogel. Critical micelle concentration and thermodynamic parameters, molar Gibbs energy, enthalpy and entropy of micellization were calculated. A linear increase of the surfactant amounts in hydrogels caused a non-linear increase of the cloud point. The appearance of the surfactant's associates in hydrogels influenced both their liberation and rheological properties.
Kurzfassung
Dieser Beitrag ist eine Analyse des Einflusses der Konzentrationsänderungen von Benzyldimethylhexadecylammoniumchlorid in Hydrogelen auf ihre Freisetzung, ihre rheologischen, assoziierenden und löslichen Eigenschaften. Die Hydrogele enthielten konstante Mengen der gel-bildenden Basis (2,5 w% Chitosan) und des Wirkstoff (0,1 w% Chlorhexidindihydrochlorid) und 0.005 – 0.05 w% Tensid, das als Verstärker eingesetzt wurde. Die höchste Menge an freigesetztem Wirkstoff stimmte mit der höchsten Tensidkonzentration im Hydrogel überein. Die kritische Mizellbildungskonzentration und die thermodynamischen Parameter (molare Gibbs-Energie, Enthalpie und Entropie der Mizellenbildung) wurden berechnet. Ein linearer Anstieg der Tensidmenge in den Hydrogelen verursachte einen nicht linearen Anstieg der Cloudpunkte. Das Auftreten von Tensidassoziaten beeinflusste sowohl die Freisetzung als auch die rheologischen Eigenschaften.
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© 2014, Carl Hanser Publisher, Munich
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Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Abstracts
- Abstracts
- Application
- Enhancing the Surface Properties of Some Amine Alginate Salts with Cationic Surfactant
- Method Development
- Transmission Measurements as Tool to Study Phase Transitions of Liquid Mixtures
- Novel Surfactant
- Synthesis and Surface Active Properties of Dimeric Gemini Sulfonate Surfactants
- Physical Chemistry
- Efficiency Boosting in Technical Grade Sugar Surfactant Based Microemulsions Using Pluronics
- Impact of Surfactants on the Performance of “Green Additives” as Calcium Carbonate Inhibitors for Aqueous Systems
- Study of Surfactant (Benzyldimethylhexadecylammonium Chloride) Effect on Selected Properties of Hydrogels
- Physicochemical Properties of Quaternary Ammonium Surfactants with Hydroxyethyl Groups
- Environmental Chemistry
- Removal of Basic Red 5 on Calcined Kaolinite – Characterization and Adsorption Kinetics
- Conference and Meeting Report
- Emulsions and Dispersions, Trends in Detergency, Cleaning and Hygiene, Sustainability and Product Safety, Forum for Innovations