Title :
Water induced bioelectret state in aminoacidic homopolymers
Author :
Bridelli, M.G. ; Capelletti, R. ; Vecli, A. ; Zaniboni, M.
Author_Institution :
Dept. of Phys., Parma Univ., Italy
Abstract :
In order to attribute each peak of the complex TSDC (thermally stimulated depolarization current) lysozyme spectrum to a water-induced polarization process occurring at a given polypeptide chain segment, the authors have measured and compared the TSDC and infrared absorption spectra of several aminoacidic synthetic homopolymers at different hydration levels. The A-band (135-160 K), present in all the homopolymers investigated, is due to water molecule reorientation around the peptide bond. The B-band (~215 K) is related to the relaxation of the side chains, whose mobility and reorientation parameters are affected by the hydration level
Keywords :
bioelectric phenomena; bonds (chemical); dielectric polarisation; electrets; infrared spectra of organic molecules and substances; molecular biophysics; molecular reorientation; polymers; thermally stimulated currents; 135 to 160 K; 215 K; A-band; B-band; aminoacidic homopolymers; complex TSDC; hydration levels; infrared absorption spectra; lysozyme spectrum; mobility; peak; peptide bond; polypeptide chain segment; relaxation; reorientation parameters; side chains; thermally stimulated depolarization current; water induced bioelectret state; water molecule reorientation; water-induced polarization process; Bonding; Electromagnetic wave absorption; Physics; Polarization; Powders; Proteins; Stability; Temperature distribution; Water storage;
Conference_Titel :
Electrets, 1991. (ISE 7) Proceedings., 7th International Symposium on (Cat. No.91CH3029-6)
Conference_Location :
Berlin
Print_ISBN :
0-7803-0112-9
DOI :
10.1109/ISE.1991.167301
