Effect of membrane clarification on the physicochemical properties of pomegranate juice
2010
Mirsaeedghazi, Hossein | Emam-Djomeh, Zahra | Mousavi, Sayed Mohammad | Ahmadkhaniha, Reza | Shafiee, Abbas
Pomegranate juice (PJ) has a turbid appearance which can be clarified by membrane processing. The effect of membrane processing with hydrophilic polyvinylidene fluoride with pore sizes of 0.22 and 0.45 μm and mixed cellulose esters (MCE) with pore sizes of 0.22, 0.1, and 0.025 μm on physicochemical properties of PJ were evaluated. Turbidity, suspended solids, acidity, total soluble solids, total phenolic content and antioxidant activity decreased after passing through the membrane at the same rate for all membranes tested. Total soluble solids content (with mean rejection factor = 20.8%) and antioxidant activity (Efficient concentration 50 was duplicated) had the smallest and the greatest reduction in all membranes, respectively. Also, five important anthocyanins identified by LC/MS decreased after PJ clarification at the same rate for all membranes. Pelargonidin 3-glucoside had minimum reduction (mean rejection = 7.7%). Ellagic acid also decreased for all membranes. However, MCE 0.025 μm membrane resulted in a greater decrease than did the other membranes (mean rejection = 24.3%).
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