| Titre : |
Oxidising degradation of Valonia extract and utilisation of the products. Part 1. Oxidising degradation of Valonia extract and characterisation of the products |
| Type de document : |
texte imprimé |
| Auteurs : |
Bi Shi, Auteur ; Ying Di, Auteur ; Youjie He, Auteur ; Lijiang Song, Auteur ; Yu Zhao, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 258-262 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Aluminium trivalent
Chrome trivalent
Complexation (chimie)
Couleur
Extraits de plantes
Oxydation
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
Poids moléculaires
Résistance chimique
Tanins végétaux
Valonia et constituantsValonia est un genre d'algues vertes de la famille des Valoniaceae. La taille d'une seule cellule pluri-nucléée peut atteindre 2 cm chez certaines espèces. (Wikipedia)
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Oxidation using H2O2 brings about degradation of valonia extract. Three typical products with novel properties were obtained when 20%, 40% and 60% H2O2 (conc. 50%) were used. Determinations indicated that the oxidising reaction leads to lowering of molecular weight, lightening of colour, improving of acid and salting-out resistances and increasing of hydrophilic groups, carboxyl in particular. The more interesting results are that penetrating rates of the degraded products in pelt are markedly accelerated and that the alkali resistance of complex compounds of the products and Cr(III) or Al(III) is considerably increased. The effects above are enhanced with increasing offer of H20.The conditions for oxidising degradation are described and the potentials of utilising the products are discussed. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURES : Oxidising degradation of valonia extract - Determination of molecular weight distribution - Colour determination - Characterisation of structure - Acid resistance and salting-out effect determinations - Determination of tanning property - Complexing characteristics with Al(III) and Cr (III)
- RESULTS AND DISCUSSION
- Table 1 : Molecular weight distributions of oxidised degradation products of valonia extracts
- Table 2 : The colour of valonia extract and its oxidised degradation products
- Table 3 : Precipitate ratios (%) of valonia extract and its oxidised degradation products at different pH*
- Table 4 : Precipitate ratios (%) of valonia extract and its oxidised degradation products in NaC1 solution
- Table 5 : The tanning properties of valonia extract and its oxidised degradation products*
- Table 6 : Precipitating pH of complex solutions of oxidised degradation products and Cr(III)
- Table 7 : Precipitating pH of complex solutions of oxidised degradation products and Al(III) |
| En ligne : |
https://drive.google.com/file/d/1MNgqR-q-yGLMFjML87uHVZ7aRinbwt3x/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40815 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 6 (11-12/2000) . - p. 258-262
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Oxidising degradation of Valonia extract and utilisation of the products. Part 1. Oxidising degradation of Valonia extract and characterisation of the products in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)
