From three krili products (powder, precipitate, and protein concentrate), 132 volatile compounds including 38 hydrocarbons, 18 alcohols, 16 aldehydes, 13 ketones, 22 nitric compounds, 10 fatty acids, 6 sulfuric compounds, and 11 other, have been isolated and identified using GC-MS, and distilling as well as extractive techniques. Total volatile compounds content (expressed as dry weight of the product) in krill protein concentrate, krill powder, and krill precipitate amounted to 75.41, 35.58, and 29.25 mg/kg, respectively. It was found that the specific smell of krill powder was due to: piperazine, 2-metyl-N-phenyl-propanoamide-2, dodecanoic acid amine, 4-methylthiazole, dimethyl trisulphide, pentadecanocarboxylic acid, 2,3-dihydroinden-lH-on-l, and heptadecanocarboxylic acid, and that of krill precipitate was due to nonadien-3,6-ol-1, methyl ester of 4,7,10- hexadecanotrienoic acid, 2,4-dimethyl-pentanol-2, tricyclodecanodimethanol, 3-dodecenylo-dihydro-2,5-furandion, heptenal-4, and octen-2-ol-1. It was further found that the specific smell of krill concentrate was due to: 4-methylpyrimidine, 4-methylpyridine, azulene and furandion derivatives, and methyl ester of 4,7,10-hexadecanotrienoic acid. Variations in qualitative and quantitative composition of volatile compounds in products under test were found to be due to differences in the process of production, in particular within parameters of heat treatment.
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