However, a previous study suggested that storage of wet grape pomace enables fermentation that leads to structural modification of seeds, which ultimately facilitates oil extraction by pressing and degradation of polyphenolic compounds that are more oil-soluble than native polyphenols ( Rombaut et al., 2015 ).
What is grape seed oil?
Grape seed oil, a product derived from seed grape pomace, contributes to the recycling and reuse of winery waste, as well as diversifies the range of value-added products of the wine industry.
Does cold pressed grape seed oil contain antioxidants?
Composition and antioxidant ability of cold-pressed grape seed oil and cold pressed grape seed cake superfine powder. Master’s dissertations Study on the application of oil-soluble natural antioxidants in grape seed oil and walnut oil.
How much phenol is in seed cake after oil extraction?
Thus, large amounts of phenolic compounds still remain in the seed cake after oil extraction; total phenol levels can reach 5.93?89.6 mg GAE/g, which is approximately 100 times higher the total phenol content in oil) ( Lutterodt et al., 2011 ). Furthermore, oil residue from GSO is also rich in phenolic substances ( Maier et al., 2009 ).