Yield and Composition of Grape Seed Oils Extracted by Supercritical Carbon Dioxide and Petroleum Ether:  Varietal Effects

Abstract

Grape seed has a well-known potential for production of oil as a byproduct of winemaking and is currently produced as a specialty oil byproduct of wine manufacture. Seed oils from eight varieties of grapes crushed for wine production in British Columbia were extracted by supercritical carbon dioxide (SCE) and petroleum ether (PE). Oil yields by SCE ranged from 5.85 +/- 0.33 to 13.6 +/- 0.46% (w/w), whereas PE yields ranged from 6.64 +/- 0.16 to 11.17 +/- 0.05% (+/- is standard deviation). The oils contained alpha-, beta-, and gamma-tocopherols and alpha- and gamma-tocotrienols, with gamma-tocotrienol being most important quantitatively. In both SCE- and PE-extracted oils, phytosterols were a prominent feature of the unsaponifiable fraction, with beta-sitosterol quantitatively most important with both extractants. Total phytosterol extraction was higher with SCE than with PE in seven of eight variety extractions. Fatty acid composition of oils from all varieties tested, and from both extraction methods, indicated linoleic acid as the major component ranging from 67.56 to 73.23% of the fatty acids present, in agreement with literature reports.

Characterization of grape seed and pomace oil extracts

“…They reported that the oil content of seeds obtained from different grape cultivars ranged from 9.90 to 20.00%. Similarly, Beveridge et al (2005) using two extraction methods found that grape seed oil yields ranged from 5.85 to 13.6% and 6.64 to 11.17% with supercritical carbon dioxide and petroleum ether extractions, respectively. On the other hand, the oil contents of pomace varied from 5.47 to 8.66%.…”

Chromatographic Quantitation of Some Bioactive Minor Components in Oils of Wheat Germ and Grape Seeds Produced as By-Products

“…Linoleic acid (omega-6) is one of two essential fatty acids which can not be synthesized in the body and it is the precursor of a family of other fatty acids such as arachidonic acid and gamma-linolenic acid 16,17) . Beveridge et al,used two extraction methods; found that GSO is ranged from 5.85 to 13.6% and 6.64 to 11.17% with supercritical CO 2 and petroleum ether extraction respectively 18) . Grape seed and pomace oils had nearly similar FA profile with higher linoleic acid and very low linolenic acid content that make the oil more resistant to autoxidation.…”

Isolation of Tomato Seed Oil From Tomato Waste by Application of Supercritical Fluid CO2 Extraction

“…A hydro separation method (G:V = 1:3) was conducted in order to separate tomato seeds from the rest of the waste material, where G -tomato solid waste (skin and seed), V -distillated water. Through the hydro separation process it was established that seeds constitute 37,9 % (wt) of the waste material [5]. After the hydro separation procedure, obtained seeds were submitted to ambient temperature drying process in absence of sunlight.…”