Characterization of pectins extracted from pomegranate peel and their gelling properties
Abid, Mouna | Cheikhrouhou, S. | Renard, Catherine M.G.C. | Bureau, Sylvie | Cuvelier, Gérard | Attia, Hamadi | Ayadi, M.A.
The composition of pomegranate peel, the main by-product during pomegranate processing, and some of the characteristics of the water-soluble pectins were investigated. Four tunisian pomegranate peels were subjected to hot aqueous extractions (86°C, 80min, 20mM nitric acid). Pomegranate peels yielded between 6.8% and 10.1% pectins. The extracted pectins were low methylated and were characterized by the predominance of homogalacturonan regions. Principal component analysis applied on FT-IR spectral data in the region between 4000 and 650cm−1 differentiated the samples according to their degree of methylation. At pH 3, in the presence of 0.7% pectin, all solutions showed a rapid gel formation with G′>G″. With decreasing temperature from 90°C to 10°C, G′ increased to reach a plateau at 10°C. The variation in the pectin gel formation between varieties was attributed to difference in pectin characteristics particularly the hydrodynamic volume and the neutral sugar content.
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