Characterization of pomegranate peels tannin extractives

H. Saad , Fatima Charrier-El Bouhtoury (1) , A. Pizzi (2) , K. Rode (3) , Bertrand Charrier (1) , N. Ayed (4)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 LERMAB - Laboratoire d'Etude et de Recherche sur le Matériau Bois
3 Deutsches Kunststoff-Institut
4 INSAT - Institut National des Sciences Appliquées et de Technologie [Tunis]

The phenolic extractives of pomegranate peels from various cultivars were studied. The total polyphenols, the condensed and the hydrolyzable tannin contents were analyzed for 4 Tunisian pomegranate cultivars (Mekki, Chelfi, Gabsi, Jbeli). Matrix assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry was used to examine the tannin oligomer structure. Analysis shows fluctuating rates of total polyphenols, condensed and hydrolyzable tannins between the different cultivars, but they are considered higher than those found with other plants. Flavonoid oligomers up to pentamers and some hexamers were detected in MALDI-TOF positive ion mode analysis. In the negative ion mode analysis the majority of the oligomers have glucose residues linked to them.

Mots clés: Pomegranate peels; Polyphenols; Tannins; MALDI-TOF; Oligomer distribution

Domaines: Chimie théorique et/ou physique; Chimie analytique; Polymères; Matériaux

H. Saad, Fatima Charrier-El Bouhtoury, A. Pizzi, K. Rode, Bertrand Charrier, et al.. Characterization of pomegranate peels tannin extractives. Industrial Crops and Products, 2012, 40, pp.239-246. ⟨10.1016/j.indcrop.2012.02.038⟩. ⟨hal-02009716⟩