| Título: | High stability organic tanning using plant polyphenols part 2 : the mechanims of the vegetable tannin-oxazolidine tannage (1999) |
| Autores: | SHI, BI, Autor ; HE, YOUJIE, Autor ; ATTENBURROW, G. E., Autor ; ZENG, SHAOYU, Autor ; COVINGTON, A. D., Autor ; FAN, HOAJUN, Autor |
| Tipo de documento: | Article : texto impreso |
| Dentro : | JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS AND CHEMISTS (VOL 83 NRO 1, ene.-feb. 1999) |
| Artículo en la página: | pp. 8-13 |
| Langues: | Inglés |
| Resumen: | Catechin was used as a model for condensed vegetable tannins, to elucidate the reaction between the flavonoid ring system and oxazolidines in the combination tannage. Using H-NMR, C-NMR and paper chromatography, it is shown that the crosslinking reaction occurs predominantly at the C-6 and C-8 of the phloroglucinol A ring of catechin. The crosslinker reacts at the C-5 of oxazolidine, by ring opening and reacting via the N-methylol intermediate. |
