PULSED ELECTRIC FIELD EXTRACTION OF VALUABLE COMPOUNDS FROM GRAPE SEEDS
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2022-01-01
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Abstract
The seeds of grape are known as a valuable source of phenolic compounds, which may act as radical scavengers by converting free radicals into less reactive species. Maintaining their quality during processing is an important feature since most of them are thermo-sensitive compounds susceptible to oxidation and degradation. In this paper, pulsed electric field (PEF) under moderate field strength (0.86 kV cm-1, 900 short pulses of 100 μs) was applied as a pretreatment to facilitate the phenolic extraction. The impact of PEF was discussed compared with conventional extraction with 50 % aqueous ethanol from whole intact seeds and the residue from seed oil cold-pressing. The kinetic behavior of the antioxidant activity of extracts was evaluated using DPPH assays to assess the correlation of total phenolic content and antioxidant activity. Compared to the cold pressing pretreatment or conventional extraction at 60°C, the PEF was not competitive in terms of recovery rate but represented a suitable method to produce highpurity extracts with beneficial antioxidant properties.