<b>Resistance of the carp mirror skin (<em>Cyprinus carpio specularis</em>) tanned by chromium and bioleather technique</b> - DOI: 10.4025/actascianimsci.v26i4.1711

Abstract

The objective of the work was to evaluate the tanning technique to bioleather and with chromium salts, in carp mirror skins (Cyprinus carpio specularis). The skins wore removed by means of a machine, identified and congealed. Next they were tanned by the two techniques. The test bodies wore removed and taken to the laboratory climatized around 23^ºC and relative humidity of the 50% air, as ABNT- NBR 10455 (1988), for 24 hours. For the tests of tensile strenght and to the elongation and the determination of the gradual tear force dynamometer, EMIC was used. Samples of the dorsal region of the skin for analysis of scanning electron microscopy wore removed (MEV). The samples wore drought in critical point with metallized CO₂ and with íons of gold-palladium. Specimens were then electron-micrographed with JEOL-JSM 5410. One observed the interlacement and the overlapping of the layers of the collagens staple fibers that provide greater resistance to the leather, and this resistance can be evidenced by the tests. The pieces of leather tanned with the bioleather technique presented higher values in the test of traction (20.45 N/mm²) in comparison to chromium (12.32 N/mm²). There was no difference in the elongation between the treatments (bioleather = 72.52%; chromium = 84.74%). For the test of gradual tearing, tanning to chromium was superior (26.28 N/mm) compared with bioleather (11.96 N/mm). Even though, the two tanning techniques can be used for skins of this species of fish for clothes confection