Titre : |
Polyphenols of acacia arabica pods |
Type de document : |
texte imprimé |
Auteurs : |
A. J. Goodwin, Auteur ; H. E. Nursten, Auteur |
Année de publication : |
1973 |
Article en page(s) : |
p. 166-172 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Acacia et constituants Chromatographie Polyphénols
|
Index. décimale : |
547 Chimie organique : classer la biochimie à 574.192 |
Résumé : |
Monoliform fruit pods from India were extracted with cold water. The aqueous solution was continuously extracted with ethyl acetate at 35°, and this extract was shown by paper chromatography to consist of ten polyphenols. Three of these have been identified as gallic acid, m-digallic acid, and (+)-catechin. Catechin has not previously been isolated from Acacia arabica pods. Three other components have been isolated in a chromatographically homogeneous state, two of which are galloylated flavanoids. These results differ from published work on pods from homoegeneous state, two of which are galloylated flavanoids. These results differ from published work on pods from Egypt, indicating possible taxonomic value. This is emphasised by the discovery of an extra polyphenol in extracts et non-moniliform pods from India. The extra component is probably a galloylated flavan-3,4-diol. |
Note de contenu : |
- Material
- Preparation of extracts
- Paper chromatography
- Cellulose column chromatography of the main extract
- Isolation of gallic acid
- Note concerning component 3
- Examination of an extract of the main extract free from gallic and m-digallic acids
- Group 2B and 2E
- Polycaprolactam column chromatography of groups 2A and 2C
- Component 2 and 8 and 10
- Hydrolysates
- Tests for leucoanthocyanins
- The non-moniliform sample
- Repeat of extraction procedure of endres et al.
- Table 1 : Summary of reactions of polyphenols encountered in this investigation
- Table 2 : The components found in the main extract and the aqueous residue
- Table 3 : Separation of the main extract on a cellulose column
- Table 4 : Separation of an extract, free from gallic andm-digallic acids, on a cellulose powder column
- Table 5 : TR absorption frequencies (cm-1)
- Table 6 : Rf falues of reference sugars and sugar alcohols
- Table 7 : Comparison of cyanidin chloride with the unknown anthocyanidin (?) from component 12
- Table 8 : Percentage by weight of material extracted from pods of A. arabica by various solvents
- Table 9 : Components present in various extracts of pods of A. arabica |
En ligne : |
https://drive.google.com/file/d/1GDRUbrmx_k5vZXkgzwWZFkUT8cO5aolW/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31708 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 57 (Année 1973) . - p. 166-172