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  • Title: [Comparison of the biological activity and stability of menadione and menadiol in male chickens].
    Author: Gropp J, Mehringer W.
    Journal: Z Ernahrungswiss; 1990 Dec; 29(4):219-28. PubMed ID: 2080634.
    Abstract:
    A bioassay of vitamin K is described, based on the prothrombin clotting time of 3-week-old, vitamin-K-depleted, and cumatetralyl-sensitized male broiler chicks, using a homologous thrombokinase preparation. With this test it could be shown that the diacetate and dibutyrate esters of menadiol are vitamin-K-active. The bioactivity of menadione from these menadiolesters amounted to about 70% of the standard menadione from a coated menadione sodium bisulfite (Dohyfral). Menadiol seems to be temperature-resistant under such conditions, whereby two uncoated MSB preparations lost about 60% of their activity.
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