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Further studies on the estimation of diacetyl by the methods of Prill and Hammer and Owades and Jakovac

Published online by Cambridge University Press:  01 June 2009

B. Walsh  and
T. M. Cogan
B. Walsh
Affiliation:
National Dairy Research Centre, The Agricultural Institute, Fermoy, Co. Cork, Irish Republic
T. M. Cogan
Affiliation:
National Dairy Research Centre, The Agricultural Institute, Fermoy, Co. Cork, Irish Republic
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Summary

Both the rate of formation and the total amount of dimethylglyoxime formed from diacetyl in the presence of hydroxylamine were increased on omission of phosphate from the Owades & Jakovac (1963) hydroxylamine reagent. Sodium acetate was also unnecessary and slightly decreased the rate of dimethylglyoxime formation. The optimum concentration of hydroxylamine lay between 0·5 and 0·75 M. The heating time necessary for formation of dimethylglyoxime can be reduced from 60 to 20min at 75°C. Based on these findings a shortened and more sensitive method for the estimation of diacetyl is recommended.

Type
Research Article
Information
Journal of Dairy Research , Volume 41 , Issue 1 , February 1974 , pp. 31 - 35
Copyright
Copyright © Proprietors of Journal of Dairy Research 1974

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References

REFERENCES

Cogan, T. M. (1972). Journal of Dairy Science 55, 382.CrossRefGoogle Scholar
Owades, J. L. & Jakovac, J. A. (1963). Proceedings of the American Society of Brewing Chemists, p. 22.Google Scholar
Pack, M. Y., Sandine, W. E., Elliker, P. R., Day, E. A. & Lindsay, R. C. (1964). Journal of Dairy Science 47, 981.CrossRefGoogle Scholar
Prill, E. A. & Hammer, B. W. (1938). Iowa State College Journal of Science 12, 385.Google Scholar