Use of Certain Acyl-Pyrimidines as Flavouring Agents

The invention is better illustrated by but not limited to the following examples.

A comparative flavour evaluation was carried out by tasting in crystal spring water the following compounds in the concentrations indicated:

The above given comparison test shows the basic difference inasmuch as the flavour characters are concerned between 2-methyl-4-acetyl-pyrimidine and compounds 2 to 4 known in the art for promoting meat-like flavour notes.

A reconstituted beef broth was prepared by mixing together the following ingredients (parts by weight):

The broth thus prepared was divided into 3 portions of equal volume. Two of these portions were aromatized with 0.15, respectively 0.30 ppm of 2-methyl-4-acetyl-pyrimidine and the thus flavoured foodstuffs were subjected to the evaluation by a panel of flavour experts who expressed their judgement as follows:

a. non-aromatized broth: bland taste, meaty character, protein, vegetable taste

b. aromatized broth (0.15 ppm): the meaty taste was more marked than that of a.

c. aromatized broth (0.30 ppm): strong roasted and animal character.

An artificial beef broth was prepared by mixing together the following ingredients (parts by weight):

130 g of the thus obtained mixture were added under stirring to 1 lt of hot water and boiled for 2 minutes. The resulting gravy mix was divided into 3 portions of equal volume. Two of these portions were aromatized with 0.30, respectively 0.50 ppm of 2-methyl-4-acetyl-pyrimidine and the obtained flavoured foodstuffs were tasted by comparison with the unflavoured broth. The panel of flavour experts expressed their view on the flavour quality of the submitted foodstuffs as follows:

a. non-aromatized broth: sweet, fruity, typical protein hydrolysate taste.

b. aromatized broth (0.30 ppm): more pronounced meaty character, roasted, slightly caramel

c. aromatized broth (0.50 ppm): more roasted than a.; nut character.

A praline chocolate centre filling was prepared by mixing the following ingredients (parts per weight):

The foodstuff thus prepared was divided into 3 portions of equal volume. Two of these portions were aromatized with 0.30, respectively 0.50 ppm of 2-methyl-4-acetyl-pyrimidine and the thus flavoured foodstuffs were evaluated by a group of flavour experts who declared:

a. non-aromatized foodstuff: sweet, bland roasted hazelnut character

b. aromatized foodstuff (0.30 ppm): typical character of nut

c. aromatized foodstuff (0.50 ppm): more roasted than a., nut character

3.2 g of commercial instant coffee powder were dissolved in ca. 240 ml of boiling water and the obtained drink was divided into two fractions of equal volume. One of them was flavoured with 2-methyl-4-acetyl-pyrimidine at a concentration of 0.075 ppm and the thus obtained flavoured drink was subjected to an organoleptic evaluation by comparison with the unflavoured coffee drink. The taste and aroma of the flavoured drink were found to possess a more pronounced roasted character as well as a more marked nut aroma.

0.3 g of a 1.degree./oo solution of 2-methyl-4-acetyl-pyrimidine in 95% ethanol were sprayed onto 100 g of a mixture of tobacco of "american blend" type. The tobacco thus flavoured was used to manufacture "test" cigarettes, the smoke of which was then subjected to organoleptic evaluation by comparison with non-flavoured cigarettes ("control"). The tobacco used to manufacture the control cigarettes was preliminary treated with 95% ethanol. The panel of experts declared that the taste of the test cigarettes possessed more body and more defined flavour character reminiscent of the taste of hazelnuts.

An evaluation of the flavour properties of various acyl-pyrimidines was carried out in crystal spring water. The obtained results are indicated hereinbelow:

a. 4-acetyl-pyrimidine: sweet, slightly fruity, caramel

b. 4-propionyl-pyrimidine: fruity, ethereal, slightly flowery

c. 2-methyl-4-propionyl-pyrimidine: slightly fruity

d. 2-methyl-4-isovaleryl-pyrimidine: burnt, sweet, cocoa character