Fish oil having decreased fish odor and a method for preparing t

Organic compounds -- part of the class 532-570 series – Organic compounds – Fatty compounds having an acid moiety which contains the...

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554144, 554145, C07C 5136

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056938357

ABSTRACT:
A method for preparing fish oil having decreased fish odor, which comprises slightly hydrogenating fish oil to have decrease rate of iodine value of 15% or less and decrease rate of highly unsaturated fatty acid of 33% or less. A method for preparing fish oil having decreased fish odor, which comprises slightly hydrogenating fish oil under the following non-selective conditions: (1) an amount of catalyst used in the hydrogenation is 0.05% by weight or more to an amount of the fish oil; (2) hydrogen pressure in gaseous phase at the beginning of the hydrogenation is 3 kg/cm.sup.2 or more; (3) reaction temperature of the hydrogenation is in the range from 90.degree. to 150.degree. C.; (4) reaction time of the hydrogenation is in the range from 5 to 30 minutes. The fish oil is preferably sardine oil, mackerel oil, skipjack oil, tuna oil, skipjack orbital fat or tuna orbital fat.

REFERENCES:
JAOCS, vol. 66, No. 7, Jul., 1989; "Evaluation of Compounds Contributing Characterized Fishy Flavors in Fish Oils"; C. Karahadian, et al.
AOCS Official Method; Cd. 14-16; pp. 1-6; Sampling and Analysis of Commercial Fats and Oils; "Isolated Trans Isomers--Infrared Spectrophotometric Method". 1984.
CMC `Shokuhin to Kaihatsu`; Mar. 1992; "Development and Applications of Functional Lipid"; K. Sato, et al.; pp. 142-168.
Foods and Developments Thereof, vol. 27, No. 8, pp. 6-9; "Physiological Functions of n-3 Fatty Acids"; H. Suzuki, 1990.
Oil and Fat Chemistry Handbook, 3rd Addition, Feb. 28, 1990, p. 111; "Oil and Fat Chemistry Handbook"; Japan Oil Chemistry Institution.
Foods, Productions, Imports and Consumption, 1993, Sep. 20, 1993, pp. 3-7, 10-13 & 18-21; "Foods, Productions, Imports and Consumption"; Food Marketing Research.
Chemical Abstracts, vol. 109, 1988, 212 774.
Chemical Abstracts, vol. 111, 1989, 152455.

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