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The Effect of Two Methods of Pomegranate (Punica granatum L) Juice Extraction on Quality During Storage at 4 C

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Author(s): Miguel Graça | Dandlen Susana | Antunes Dulce | Neves Alcinda | Martins Denise

Journal: Journal of Biomedicine and Biotechnology
ISSN 1110-7243

Volume: 2004;
Issue: 5;
Start page: 332;
Date: 2004;
Original page

ABSTRACT
The effect of two extraction methods of pomegranate juice on its quality and stability was evaluated. The first method consisted of separation of the seeds from fruits and centrifugation. The second method consisted of squeezing fruit halves with an electric lemon squeezer. During a period of 72 hours of cold storage at 4 ∘ C, the juices were evaluated for the presence of sugars, organic acids, and anthocyanins. Delphinidin 3-glucoside was identified to be the major anthocyanin present at the level of 45–69 mg/L. Among the organic acids, oxalic and tartaric acids dominated. The major sugars detected in pomegranate juice were glucose and sucrose. No significant differences in the content of sugars, organic acids, or anthocyanins in juices obtained through application of the two different extraction methods were detected, with the exception of the drastic decrease of cyanidin 3,5 -diglucoside level in juice obtained by seed centrifugation. The pH did not show differences between treatments. Titrable acidity and the level of sugars expressed as ∘ Brix decreased after 32 and 15 hours after extraction, respectively, when juice was obtained by centrifuging the seeds.
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