| Titre : |
Studies on enzymatic unhairing : Part I. The influence of pigskin alkalisation on destruction of skin grain during depilation with pancreatic enzymes |
| Type de document : |
texte imprimé |
| Auteurs : |
Barbara Felicjaniak, Auteur |
| Année de publication : |
1985 |
| Article en page(s) : |
p. 160-163 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The enzymatic depilation of pigskins is a dangerous stage ofleather production due to hydrolysis of grain and deeper layers of ermis The extent of this destruction depends on the activity of the enzymes being used for depilation and on the quality of cured skins. Through adequate modification of a skin substrate, e.g. by increasing the resistance of grain microstructures to enzymatic proteolysis, the grain hydrolysis may be counteracted. This topic has long been discussed and one of the methods discussed is an alkaline swelling of skins by means of liming. Comparative tests produced a better quality of skins when depilated with pancreatic enzymes after pre-liming than when depilated without pre-liming. The liming was introduced into enzymatic depilation as a preparatory phase. The influence of alkali swelling (liming) has not been fully evaluated. In Heidemann's work, it was found that alkali swelling of skins intensifies the destruction of collagen by trypsin and influences the increase of damage to grain being affected by bacteria during the skin-curing process.
This negative opinion on pre-liming does not confirm our ealier histochemical examinations. The results of these examinations enabledus to find the higher resistance to proetolysis of grain microstructures of skins pre-limed than of skins depilated with pancreas enzymes without pre-liming. The reduction and even elimination of skingrain enzymatic destruction by means of skin pre-liming could not beutilised in practice due to a simultaneous immunization of bristles. Changes in the physico-chemical properties of keratin during liming made bristles insoluble in sodium sulphide. This rendered impossible a chemical removal of residual bristles, left on skins depilated by enzymes.
On the basis of earliler experiments, it seemed advisable to develop a milder method of alkalisation, which would give the optimum quality bristles and of skins depilated by enzymes. This is the subject of the present series of trials. |
| Note de contenu : |
- Characteristics of pancreatic preparation.
- Methods of preparation of pigskins for scanning electron microscope (SEM) examinations. |
| En ligne : |
https://drive.google.com/file/d/17I0hyAMEypGrZo1pwKN2I5tTpLopG45l/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9414 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 69 (Année 1985) . - p. 160-163
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Studies on enzymatic unhairing : Part I. The influence of pigskin alkalisation on destruction of skin grain during depilation with pancreatic enzymes in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 69 (Année 1985)
