Vitamin K 1 is a light yellow oil which crystallized at -20 ° and boils at 115-145 ° in a vacuum. This substance is soluble in chloroform, ethanol and other organic solvents. Its solution absorbs UV rays. Thus, in petroleum ether absorption maxima are at a wavelength equal to 243, 249, 261, 270 and 325 nm. In this series the greatest optical density ( = 420) Vitamin K shows at 249 nm.
Vitamin K 2 - yellow crystalline powder with a melting point 54 °, which dissolve in organic solvents. It has spectra similar to those of vitamin K 1, but less intensely absorbing UV rays. For example, in petroleum ether its absorption maximum is at 248 nm and is = 295.
Vitamin K 3 is a lemon-yellow crystalline substance with a characteristic odor. The melting point of 160 °. It is poorly soluble in water, due to lack of its long hydrocarbon molecule chains.
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