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710. The determination of free fatty acids in milk

Published online by Cambridge University Press:  01 June 2009

Dawn R. Perrin  and
D. D. Perrin
Dawn R. Perrin
Affiliation:
Ruakura Animal Research Station, New Zealand Department of Agriculture
D. D. Perrin
Affiliation:
Ruakura Animal Research Station, New Zealand Department of Agriculture
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Extract

An extraction-titration method is described for the determination of free fatty acids in small samples of fresh milk.

Recoveries of fatty acids added to milk ranged from 63% for butyric acid to 97% for stearic acid. For a composite sample approximating milk fat in fatty acid composition the recovery was 83%.

Interference from citric and lactic acids was not significant for reasonably fresh samples.

The method gives a higher recovery of the lower molecular weight fatty acids than is possible by earlier methods.

For titrating very dilute solutions of fatty acids α-naphtholphthalein was shown to be a more accurate indicator than phenolphthalein; it also provides a better defined endpoint.

Type
Original Articles
Information
Journal of Dairy Research , Volume 25 , Issue 2 , June 1958 , pp. 221 - 227
Copyright
Copyright © Proprietors of Journal of Dairy Research 1958

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References

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