| 摘要 |
<p>The oil of pips of fruits of the Ribes genus is an abundant, cheap source of gamma -linolenic acid. It is extracted by pressing, or by using solvents, from dried and ground residues from the production of juices, preserves and jellies or brandies, liqueurs and schnapps of fruits, such as blackcurrant, redcurrant or gooseberry. The residues may be treated with a polar solvent, before being extracted with a non-polar solvent or supercritical fluid, in order to free the oil from most of the free fatty acids, waxes, colourings and odorous compounds. A preferred embodiment comprises flaking the washed pips and protecting them against oxidation before pressing the flakes prior to solvent extraction. The refined oil is a valuable ingredient in cosmetic, dermatological, dietetic and pharmaceutical compositions.</p> |
