.alpha.-keto acids and certain precursors and derivatives thereof, particularly those selected from the group which consists of glyoxylic acid, 2-oxo-propanoic acid, 2-oxo-butanoic acid, 3-methyl-2-oxo butanoic acid, 3-methyl-2-oxo pentanoic acid, 4-methyl-2-oxo pentanoic acid, 3-hydroxy-2-oxo-propanoic acid, oxalacetic acid, 2-oxo-glutaric acid, 2-oxo-3-phenyl-propanoic acid, 3-(4-hydroxy-phenyl)-2-oxo-propanoic acid, 2-oxo-1H-indole-3-propanoic acid, 2-oxo-1H-imidazole-4-propanoic acid, 4-methylthio-2-oxo-butanoic acid, 3-mercapto-2-oxo-propanoic acid, 3-hydroxy-2-oxo-butanoic acid, 6-amino-2-oxo-hexanoic acid and 5-guanido-2-oxo-pentanoic acid, and precursors and derivatives thereof that are capable of being formed from or releasing said acids in the use medium, are useful as flavouring ingredients. Such ingredients are useful for preparing flavouring compositions and a wide variety of flavoured foodstuffs to which they impart greater creaminess and bulkiness so that they have heightened effect in the mouth and generally an enhanced mouthfeel. They are also useful for enhancing the sweetness of foods sweetened with natural or artificial sweeteners, and giving it a more natural character.

los ácidos alpha.-alpha.-keto y los ciertos precursores y derivados de eso, particularmente ésos seleccionados del grupo que consiste en el ácido glyoxylic, el ácido 2-oxo-propanoic, el ácido 2-oxo-butanoic, el ácido butanoic 3-methyl-2-oxo, el ácido pentanoic 3-methyl-2-oxo, el ácido pentanoic 4-methyl-2-oxo, el ácido 3-hydroxy-2-oxo-propanoic, ácido oxalacetic, el ácido 2-oxo-glutaric, el ácido 2-oxo-3-phenyl-propanoic, el ácido 3-(4-hydroxy-phenyl)-2-oxo-propanoic, el ácido 2-oxo-1H-indole-3-propanoic, el ácido 2-oxo-1H-imidazole-4-propanoic, el ácido 4-methylthio-2-oxo-butanoic, el ácido 3-mercapto-2-oxo-propanoic, el ácido 3-hydroxy-2-oxo-butanoic, el ácido 6-amino-2-oxo-hexanoic y el ácido 5-guanido-2-oxo-pentanoic, y los precursores y los derivados de eso de los cuales sea capaz de la formación o lanzando los ácidos dichos en el medio del uso, son útiles como ingredientes de la condimentación. Tales ingredientes son útiles para preparar composiciones de la condimentación y una variedad amplia de comestibles condimentados a los cuales impartan mayores cremosidad y volumen de modo que hayan aumentado efecto en la boca y generalmente un mouthfeel realzado. Son también útiles para realzar el dulzor de los alimentos azucarados con los dulcificantes naturales o artificiales, y darle un carácter más natural.

 
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