Characterization of Pinus brutia bark tannin by MALDI-TOF MS and 13C NMR

Abstract : The structures of condensed tannin from Pinus brutia bark were characterized by means of GC–MS, solid and liquid state 13C NMR and MALDI-TOF MS analyses. The results indicated that the monomeric units building up the condensed tannin of brutia pine bark are mainly composed of catechin/epicatechin, gallocatechin/epigallocatechin units accompanied by possibly tri- or tetra hydroxyl-flavanols. Some oligomers appear to present p-hydroxy- or 3,4-dihydroxy benzoic acid residues or glucose at their terminal unit. Apart from oligomers, monomeric flavanoids were also present in the brutia bark extract. Taxifolin was especially found in appreciable amounts. Additionally, in this tannin procyanidin oligomers predominated while prodelphinidin units were present to a lesser extent. The NMR results showed that the oligomers in brutia pine bark tannin Exhibit 2,3-cis stereochemistry and C4–C6 bonds with a noticeable portion of C4–C8 interflavonoid links being present. The MALDI-TOF MS showed a series of peaks corresponding to flavonoid hexamers of the condensed tannin (1750 Da).
Type de document :
Article dans une revue
Industrial Crops and Products, Elsevier, 2013, 49, pp.697 - 704. 〈10.1016/j.indcrop.2013.06.010〉
Liste complète des métadonnées

https://hal.univ-lorraine.fr/hal-01591853
Contributeur : Lermab Ul <>
Soumis le : vendredi 22 septembre 2017 - 10:12:07
Dernière modification le : mardi 20 mars 2018 - 10:17:49

Identifiants

Collections

Citation

Mualla Balaban Ucar, Gunes Ucar, Antonio Pizzi, Oktay Gonultas. Characterization of Pinus brutia bark tannin by MALDI-TOF MS and 13C NMR. Industrial Crops and Products, Elsevier, 2013, 49, pp.697 - 704. 〈10.1016/j.indcrop.2013.06.010〉. 〈hal-01591853〉

Partager

Métriques

Consultations de la notice

30