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Flavour defects in edible casein and skim-milk powder: II. The role of aliphatic monocarbonyl compounds

Published online by Cambridge University Press:  01 June 2009

N. J. Walker
N. J. Walker
Affiliation:
New Zealand Dairy Research Institute, Palmerston North, New Zealand
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Summary

Aliphatic monocarbonyls have been quantitatively estimated in casein and skim-milk powder during storage. Concurrently these products have been evaluated organoleptically. A close relationship was evident between monocarbonyl level and the flavour or age of the lactic casein. Furthermore, the greater flavour stability of rennet casein and skim-milk powder was coupled with reduced monocarbonyl content. Fractionation of monocarbonyls into classes and individual compounds has shown that the higher levels in lactic casein compared with other low-fat products can be accounted for by a high level of acetone. The absence of appreciable quantities of other odd-numbered methyl ketones suggests that either acetone is derived from a non-lipid constituent of acid casein or decarboxylation of acetoacetate is specifically catalysed at acid pH. All methyl ketones identified in these low-fat dairy products were present in subthreshold concentrations. Saturated and unsaturated aldehydes were present at similar levels in stored lactic casein, rennet casein and skim-milk powder samples irrespective of their degree of musty or stale flavour.

Type
Research Article
Information
Journal of Dairy Research , Volume 40 , Issue 1 , February 1973 , pp. 29 - 37
Copyright
Copyright © Proprietors of Journal of Dairy Research 1973

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