The present invention relates to the use of a special class of oligosaccharides, herein called iso-oligosaccharides, for flavour generation during thermal processing of food. The invention also relates to the use of such oligosaccharides in the form of individual compounds, or as mixtures thereof, or in the form of ingredients comprising the individual compounds or mixtures thereof, or as enzymatic or fermented preparations containing the individual compounds or mixtures thereof.
6. The acid-catalysed reversion of L-arabinose and of D-mannose