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554. Titration curves of whey constituents*

Published online by Cambridge University Press:  01 June 2009

M. Boulet  and
Dyson Rose
M. Boulet
Affiliation:
Division of Applied Biology, National Research Council, Ottawa, Canada
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Extract

Titration curves of calcium-containing and calcium-free solutions resembling milk serum indicated that precipitation of calcium from such solutions was greatly impeded by citrate. In the absence of citrate, precipitation of tricalcium phosphate was complete at pH 6·0, but, in solutions containing citrate, precipitation of tricalcium phosphate occurred gradually throughout the titration and was not complete at pH 10.

In some solutions precipitation of calcium phosphate ceased at about pH 9·7, even though the base added had been insufficient to neutralize tertiary hydrogen equivalent to the known calcium content. Precipitation of dicalcium phosphate must therefore have occurred.

The observed stability of calcium in these solutions was much greater than that predicted from the accepted solubility and dissociation constants. It is therefore concluded that detailed studies of these constants, and of the factors controlling precipitation of dior tricalcium phosphate, are needed.

Type
Original Articles
Information
Journal of Dairy Research , Volume 21 , Issue 2 , June 1954 , pp. 229 - 237
Copyright
Copyright © Proprietors of Journal of Dairy Research 1954

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References

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