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571. The effect of menadione (2-methyl-l: 4-naphthoquinone) on the keeping quality of milk

Published online by Cambridge University Press:  01 June 2009

Constance Higginbottom
Constance Higginbottom
Affiliation:
The Hannah Dairy Research Institute, Kirkhill, Ayr
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1. The addition of 1 µg. menadione/ml. to milk had no effect on the souring of the milk at 37° C. With higher concentrations of menadione the effect on the keeping quality at 37° C. varied with different milks. In some milks the clot-on-boiling stage was delayed by 1 hr. with 10 µg. menadione and by 2 to over 5 hr. with different milks containing 100 µg. menadione per ml. Some milks, however, showed no alteration in the keeping quality at 37° C. with as much as 1000 µg. menadione/ml.

2. The response of individual milks to the presence of menadione appeared to be related largely to the bacterial flora of the milk, The relative insensitivity of Gram negative rods, including coliform bacteria and of enterococci, to menadione was confirmed. Milks containing large numbers of coliform bacteria showed the least and those free of such bacteria the greatest response to menadione.

3. Menadione fed to milking cows at the rate of 100 mg·/day for a period of 3 weeks had no effect on the keeping quality of the milk when it was held at 37, 22 or 15·5° C. The time of incubation required for the milk to attain a titratable acidity equivalent to 2 ml. N/9-NaOH, to become unstable to 68 % alcohol or to boiling showed no difference between the milk from the cows given menadione and that from the control cows.

4. The menadione had no demonstrable effect on the appetite or the well-being of the cows nor on their milk yield.

5. When as much as 100 μg. menadione was given per cow per day, no menadione was detected in the milk under conditions suitable for the detection of 1 μg. menadione/ml.milk.

Type
Original Articles
Information
Journal of Dairy Research , Volume 22 , Issue 1 , February 1955 , pp. 48 - 59
Copyright
Copyright © Proprietors of Journal of Dairy Research 1955

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References

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