Weitere Untersuchungen über die Bildung und Bedeutung des Vitamin K im Pflanzenorganismus

Abstract

From ten kg. of fresh green cabbage 11 g. of dry chloroplasts contained 0.006% vit. K1 and 62 g. of dry cytoplasm 0.0001%. Seedlings of Picea canadensis formed vit. K in the dark and in daylight, the conc. being 0.001% and 0.003% of the dry wt., respectively. The conc. of vit. K is about the same for all green leaves and is often proportional to the chlorophyll content. Natural vit. K1, 2-methyl-l,4-naphthoquinone, 2-methyl-l,4-naphthohydroquinone diacetate and disuccinate had no growth-promoting effect on yeast either in the presence or absence of biotin, nor did they affect its respiration and fermentation.