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AssigneeLion Corporation
InventorsNobuji Nakatani, Reiko Inatani, Tadashi Konishi
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The invention provides a novel antioxidant obtained from rosemary and suitable for preventing oxidation of various organic materials or, in particular, oleaginous foodstuffs. The antioxidant is prepared by extracting rosemary with a non-polar organic solvent and further extracting the thus extracted material with an aqueous alkaline solution having a pH of at least 10.5 as a weakly acidic fraction soluble in such a strongly alkaline solution. The extraction with the non-polar organic solvent is preferably preceded or followed by steam distillation in order to remove any spicy volatile materials undesirable when the antioxidant is added to foodstuffs or the like. Column chromatographic separation of the above obtained weakly acidic fraction into components gives a novel compound 7.beta.,11,12-trihydroxy-6,10-(epoxymethano)abieta-8,11,13-trien-20-one as the effective ingredient of the antioxidant prepared from rosemary. Characterization of the above novel compound is given.
A method for the preparation of an antioxidant for organic materials which comprises the steps of
A method for the preparation of an antioxidant for organic materials which comprises the steps of
A method for preventing oxidation of an organic material which comprises admixing the organic material with 7.beta.,11,12-trihydroxy-6,10-(epoxymethano)abieta-8,11,13-trien-20-one.
7.beta.,11,12-Trihydroxy-6,10-(epoxymethano)abieta-8,11,13-trien-20-one expressed by the following structural formula:
A method for the preparation of 7.beta.,11,12-trihyroxy-6,10-(epoxymethano)abieta-8,11,13-trien-20-one which comprises the steps of
Dependencies are inferred from the claim text.