Study On The Extraction And Application Of Rosemary Ingredients With Different Polarity In The Linseed Oil

Natural Rosmarinus Officinalis L. is consisted of two parts, the volatile oil and thenonvolatile antioxidants. On the one hand, the volatile oil has been studied extensively becauseof its unique flavor and numerous sesquiterpenes, such as spice composition, biological agentsand pharmaceuticals. On the other hand, the antioxidants also have been widely used infood-storage, household chemicals and pharmaceuticals as a result of its excellent antioxidantability and biological activities. In recent years, the solvent extracting and separating ofeffective active ingredients from rosemary has attracted more and more attention, that is a hotresearch area.Linseed oil has been more and more popular due to its rich unsaturated fatty acid,particularly the essential fatty acid like α-linolenic acid that we human beings couldn’tsynthesize ourselves. It is also the unsaturated fatty acid, Linseed oil becomes easily oxidizedand rancid resulting in its difficult storage. Though the sealed nitrogen can protect it for awhile, linseed oil would go bad very soon once being exposed to the air. In addition, syntheticantioxidants, such as BHT and BHA, have been banned to be the food additive. So, questingfor the natural safe antioxidant additives with non-toxic becomes particularly urgent.Above all, we focus our attention on the research of the solvent extracting and separatingof effective active ingredients from rosemary to inhibit the oxidation of linseed oil. Solventsof different polarities were used to extract different components from rosemary. Firstly, thevolatile oil with low polarity was obtained from cyclohexane and the impurities like lots ofchlorophyll were removed. Secondly, the liposoluble components of medium polarity wereextracted successfully with the ethyl acetate. Finally, the highest-polarity and hydrosolublecomponents came out from the95%ethyl alcohol. After the further separations and tests, wenot only obtained new-component rosemary oil and betulinic acid, but also the monocliniccrystal of sulfur which was first obtained from rosemary. At last, the components afterextracting and separating were applied to the antioxidant experiment in linseed oil. The resultsshowed that some components had better antioxidant effects than BHT under the sameconditions while some did the opposite effects compared with the blank group.