[article]
| Titre : |
Isolation of protein products from chromium-containing leather waste using two consecutive enzyme and purification of final chromium product : pilot plant studies |
| Type de document : |
texte imprimé |
| Auteurs : |
Luisa F. Cabeza, Auteur ; Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur |
| Année de publication : |
1999 |
| Article en page(s) : |
p. 14-19 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
In this paper, the pilot plant trials of a process to treat shavings to isolate protein products and purified chromium are presented. The process uses two enzymes, pepsin and alkaline protease, in two consecutive extractions with the isolation of a high quality gelatin and a hydrolysate. Chrome shavings (10 kgs) are pretreated with 0.1 % pepsin at pH 3-3.5 and at room temperature for 8 hours and gelatin is then extracted at pH 8 and 70°C ; hydrolysed protein is then isolated with 0.005 % alkaline protease at pH 8 and 70°C for 3 hours. The remaining solid, called chrome cake, is chemically treated to prepare it for recycling in the tanning industry. THe chemical and physical properties of the protein products and the chemical characteristics of the purified chromium are presented. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7852 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 83, N° 1 (01-02/1999) . - p. 14-19
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Isolation of protein products from chromium-containing leather waste using two consecutive enzyme and purification of final chromium product : pilot plant studies in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 83, N° 1 (01-02/1999)
