Le Roux Erwan, Doco Thierry, Sarni-Manchado Pascale, Lozano Yves, Cheynier Véronique. 1998. A-type proanthocyanidins from pericarp of Litchi chinensis. Phytochemistry, 48 (7) : 1251-1258.
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Autre titre : Des composés de type proanthocyanidines isolés à partir du péricarpe de Litchi chinensis
Résumé : A tannin extract was isolated from freeze-dried litchi pericarp (#Litchi chinensis#). HPLC analysis, after thioacidolysis reaction, revealed that this tannin fraction consisted of epicatechin units linked by both Aand B-type interflavonoid bonds. The calculated average degree of polymerization, considering the presence of A-type linkages, was 6.4. Characterization of oligomeric and polymeric procyanidins was performed using electrospray ionization mass spectrometry. Numerous oligomers containing one or more A-type interflavanoid linkages were detected. A regular repartition of the number of A-type linkages for each polymer length (e.g. from 2 to 7 for DP17 with mostly 4 A-type linkages) was observed. The average number of A-type linkages also increased with the DP, the predominant species containing one A-type linkage (denoted 1A) from DP2 to 5, 2A from DP6 to 10, 3A from DP11 to 15 and 4A from DP16 to 20. The highest DP was estimated at 22, with predominantly 5-6 A-type interflavanoid linkages.
Mots-clés Agrovoc : Litchi chinensis, pigment, péricarpe, flavonoïde, spectrométrie de masse, polymérisation
Classification Agris : F60 - Physiologie et biochimie végétale
Auteurs et affiliations
- Le Roux Erwan
- Doco Thierry, Institut des produits de la vigne (FRA)
- Sarni-Manchado Pascale
- Lozano Yves, CIRAD-AMIS-AGROALIMENTAIRE (FRA)
- Cheynier Véronique
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/390548/)
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