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Keywords
Schöning, Michael Josef ; Abouzar, Maryam H. ; Wagner, Torsten ; Näther, Niko ; Rolka, David ; Yoshinobu, Tatsuo ; Kloock, Joachim P. ; Turek, Monika ; Ingebrandt, Sven ; Poghossian, Arshak
Schöning, Michael Josef ; Abouzar, Maryam H. ; Ingebrandt, Sven ; Platen, Johannes ; Offenhäusser, Andreas ; Poghossian, Arshak
Schusser, Sebastian ; Poghossian, Arshak ; Bäcker, Matthias ; Leinhos, Marcel ; Wagner, Patrick ; Schöning, Michael Josef
In vitro studies of the degradation kinetic of biopolymers are essential for the design and optimization of implantable biomedical devices. In the presented work, a field-effect capacitive sensor has been applied for the real-time and in situ monitoring of degradation processes of biopolymers for the first time. The polymer-covered field-effect sensor is, in principle, capable to detect any changes in bulk, surface and interface properties of the polymer induced by degradation processes. The feasibility of this approach has been experimentally proven by using the commercially available biomedical polymer poly(D,L-lactic acid) (PDLLA) as a model system. PDLLA films of different thicknesses were deposited on the Ta₂O₅-gate surface of the field-effect structure from a polymer solution by means of spin-coating method. The polymer-modified field-effect sensors have been characterized by means of capacitance–voltage and impedance-spectroscopy method. The degradation of the PDLLA was accelerated by changing the degradation medium from neutral (pH 7.2) to alkaline (pH 9) condition, resulting in drastic changes in the capacitance and impedance spectra of the polymer-modified field-effect sensor.
Schusser, Sebastian ; Poghossian, Arshak ; Bäcker, Matthias ; Krischer, M. ; Leinhos, Marcel ; Wagner, P. ; Schöning, Michael Josef
The characterization of the degradation kinetics of biodegradable polymers is mandatory with regard to their proper application. In the present work, polymer-modified electrolyte–insulator–semiconductor (PMEIS) field-effect sensors have been applied for in-situ monitoring of the pH-dependent degradation kinetics of the commercially available biopolymer poly(d,l-lactic acid) (PDLLA) in buffer solutions from pH 3 to pH 13. PDLLA films of 500 nm thickness were deposited on the surface of an Al–p-Si–SiO2–Ta2O5 structure from a polymer solution by means of spin-coating method. The PMEIS sensor is, in principle, capable to detect any changes in bulk, surface and interface properties of the polymer induced by degradation processes. A faster degradation has been observed for PDLLA films exposed to alkaline solutions (pH 9, pH 11 and pH 13).
Schusser, Sebastian ; Menzel, S. ; Bäcker, Matthias ; Leinhos, Marcel ; Poghossian, Arshak ; Wagner, P. ; Schöning, Michael Josef
Impedance spectroscopy: A tool for real-time in situ monitoring of the degradation of biopolymers
(2013)
Schusser, Sebastian ; Leinhos, Marcel ; Bäcker, Matthias ; Poghossian, Arshak ; Wagner, Patrick ; Schöning, Michael Josef
Investigation of the degradation kinetics of biodegradable polymers is essential for the development of implantable biomedical devices with predicted biodegradability. In this work, an impedimetric sensor has been applied for real-time and in situ monitoring of degradation processes of biopolymers. The sensor consists of two platinum thin-film electrodes covered by a polymer film to be studied. The benchmark biomedical polymer poly(D,L-lactic acid) (PDLLA) was used as a model system. PDLLA films were deposited on the sensor structure from a polymer solution by using the spin-coating method. The degradation kinetics of PDLLA films have been studied in alkaline solutions of pH 9 and 12 by means of an impedance spectroscopy (IS) method. Any changes in a polymer capacitance/resistance induced by water uptake and/or polymer degradation will modulate the global impedance of the polymer-covered sensor that can be used as an indicator of the polymer degradation. The degradation rate can be evaluated from the time-dependent impedance spectra. As expected, a faster degradation has been observed for PDLLA films exposed to pH 12 solution.
Schusser, Sebastian ; Krischer, Maximillian ; Bäcker, Matthias ; Poghossian, Arshak ; Wagner, Patrick ; Schöning, Michael Josef
Designing novel or optimizing existing biodegradable polymers for biomedical applications requires numerous tests on the effect of substances on the degradation process. In the present work, polymer-modified electrolyte–insulator–semiconductor (PMEIS) sensors have been applied for monitoring an enzymatically catalyzed degradation of polymers for the first time. The thin films of biodegradable polymer poly(d,l-lactic acid) and enzyme lipase were used as a model system. During degradation, the sensors were read-out by means of impedance spectroscopy. In order to interpret the data obtained from impedance measurements, an electrical equivalent circuit model was developed. In addition, morphological investigations of the polymer surface have been performed by means of in situ atomic force microscopy. The sensor signal change, which reflects the progress of degradation, indicates an accelerated degradation in the presence of the enzyme compared to hydrolysis in neutral pH buffer media. The degradation rate increases with increasing enzyme concentration. The obtained results demonstrate the potential of PMEIS sensors as a very promising tool for in situ and real-time monitoring of degradation of polymers.
Schusser, Sebastian ; Krischer, M. ; Molin, D. G. M. ; Akker, N. M. S. van den ; Bäcker, Matthias ; Poghossian, Arshak ; Schöning, Michael Josef
A sensor system for investigating (bio)degradationprocesses of polymers is presented. The system utilizes semiconductor field-effect sensors and is capable of monitoring the degradation process in-situ and in real-time. The degradation of the polymer poly(d,l-lactic acid) is exemplarily monitored in solutions with different pH value, pH-buffer solution containing the model enzyme lipase from Rhizomucormiehei and cell-culture medium containing supernatants from stimulated and non-stimulated THP-1-derived macrophages mimicking activation of the immune system.
Schubert, J. ; Schöning, Michael Josef ; Mourzina, Y. G. ; Legin, A. V. ; Vlasov, Y. G. ; Zander, W. ; Lüth, H.