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2 results on '"stimulus-responsive network"'

1. Ionic and Polyampholyte N-Isopropylacrylamide-Based Hydrogels Prepared in the Presence of Imprinting Ligands: Stimuli-Responsiveness and Adsorption/Release Properties

Author

Carmen Alvarez-Lorenzo, Tatiana V. Burova, Valerij Ya. Grinberg, Miguel A. Lago, and Angel Concheiro

Subjects
stimulus-responsive network, imprinted hydrogel, ionic and polyampholite hydrogels, propranolol, ibuprofen, controlled release, Biotechnology, TP248.13-248.65, Medicine (General), R5-920
Abstract

The conformation of the imprinted pockets in stimulus-responsive networks can be notably altered when the stimulus causes a volume phase transition. Such a tunable affinity for the template molecule finds interesting applications in the biomedical and drug delivery fields. Nevertheless, the effect that the binding of the template causes on the stimuli-responsiveness of the network has barely been evaluated. In this work, the effect of two ionic drugs used as templates, namely propranolol hydrochloride and ibuprofen sodium, on the responsiveness of N-isopropylacrylamide-based hydrogels copolymerized with acrylic acid (AAc) and N-(3-aminopropyl) methacrylamide (APMA) and on their ability to rebind and to control the release of the template was evaluated. The degree of swelling and, in some cases, energetics (HS-DSC) of the transitions were monitored as a function of temperature, pH, and concentration of drug. Marked decrease in the transition temperature of the hydrogels, accompanied by notable changes in the transition width, was observed in physiological NaCl solutions and after the binding of the drug molecules, which reveals relevant changes in the domain structure of the hydrogels as the charged groups are shielded. The ability of the hydrogels to rebind propranolol or ibuprofen was quantified at both 4 and 37 °C and at two different drug concentrations, in the range of those that cause major changes in the network structure. Noticeable differences between hydrogels bearing AAc or APMA and between imprinted and non-imprinted networks were also observed during the release tests in NaCl solutions of various concentrations. Overall, the results obtained evidence the remarkable effect of the template molecules on the responsiveness of intelligent imprinted hydrogels.

Published
2011
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2. Ionic and Polyampholyte N-Isopropylacrylamide-Based Hydrogels Prepared in the Presence of Imprinting Ligands: Stimuli-Responsiveness and Adsorption/Release Properties

Author

Tatiana V. Burova, Angel Concheiro, Valerij Ya. Grinberg, Carmen Alvarez-Lorenzo, Miguel A Lago, and Universidade de Santiago de Compostela. Departamento de Farmacia e Tecnoloxía Farmacéutica

Subjects
Materials science, lcsh:Biotechnology, Biomedical Engineering, Ionic bonding, Nanotechnology, Ibuprofen, macromolecular substances, Article, imprinted hydrogel, Biomaterials, chemistry.chemical_compound, lcsh:TP248.13-248.65, medicine, Molecule, Methacrylamide, Controlled release, stimulus-responsive network, ionic and polyampholite hydrogels, propranolol, Acrylic acid, Stimulus-responsive network, ibuprofen, lcsh:R5-920, Ionic and polyampholite hydrogels, technology, industry, and agriculture, Imprinted hydrogel, Propranolol, chemistry, Drug delivery, Self-healing hydrogels, Biophysics, Swelling, medicine.symptom, controlled release, lcsh:Medicine (General)
Abstract

The conformation of the imprinted pockets in stimulus-responsive networks can be notably altered when the stimulus causes a volume phase transition. Such a tunable affinity for the template molecule finds interesting applications in the biomedical and drug delivery fields. Nevertheless, the effect that the binding of the template causes on the stimuli-responsiveness of the network has barely been evaluated. In this work, the effect of two ionic drugs used as templates, namely propranolol hydrochloride and ibuprofen sodium, on the responsiveness of N-isopropylacrylamide-based hydrogels copolymerized with acrylic acid (AAc) and N-(3-aminopropyl) methacrylamide (APMA) and on their ability to rebind and to control the release of the template was evaluated. The degree of swelling and, in some cases, energetics (HS-DSC) of the transitions were monitored as a function of temperature, pH, and concentration of drug. Marked decrease in the transition temperature of the hydrogels, accompanied by notable changes in the transition width, was observed in physiological NaCl solutions and after the binding of the drug molecules, which reveals relevant changes in the domain structure of the hydrogels as the charged groups are shielded. The ability of the hydrogels to rebind propranolol or ibuprofen was quantified at both 4 and 37 °C and at two different drug concentrations, in the range of those that cause major changes in the network structure. Noticeable differences between hydrogels bearing AAc or APMA and between imprinted and non-imprinted networks were also observed during the release tests in NaCl solutions of various concentrations. Overall, the results obtained evidence the remarkable effect of the template molecules on the responsiveness of intelligent imprinted hydrogels This work was financed by Ministerio de Ciencia y Tecnología (SAF2011-22771 and MIPFOOD IPT-060000-2010-14) and FEDER Spain, and by the RFBR (Project 04-03-32355) and DCMS RAS (Program “Creation and Study of Macromolecules and Macromolecular Structures of New Generations”) SI

Published
2011

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