Abstract
This paper describes the preparation and characterization of collagen
films extracted from swim bladders of three species of tropical fishes:
Arius parkeri (Gurijuba), Cynoscion acoupa (Pescada Amarela) and
Cynoscion leiarchus (Pescada Branca). Collagen was extracted under
acidic conditions (CH3COOH, 2.5 pH) and precipitated by the addition of
NaCl up to 3.0 mot L-1. The films were prepared in acrylic containers
and dried in a vacuum atmosphere. The collagen films were characterized
by hydroxyproline contents, thermal analysis, scanning electron
microscopy and impedance spectroscopy. The determined values of
4-hydroxiproline and collagens in the films were: 105.23 +/- 4.48 and
873.2; 102.94 +/- 4.42 and 854.1; 100.65 +/- 4.80 and 835.8 mg g(-1) for
A. parkeri, C. acoupa and C. leiarchus, respectively. Differential
scanning calorimetry revealed high denaturation temperature peaks at
temperatures ranging from 65.9 to 74.8 degrees C. The micrographs showed
no fibrillar organization along the material, but spongy structure, with
cavity diameters relatively uniform, at around 2 mu m. The impedance
spectroscopy presented a distributed relaxation process. A. parkeri's
films showed piezoelectricity. (c) 2007 Published by Elsevier B.V.
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