Page 203 - Academic Press Encyclopedia of Physical Science and Technology 3rd BioChemistry

P1: GTY Final pages
Encyclopedia of Physical Science and Technology EN017G-116 August 2, 2001 18:14

Vitamins and Coenzymes 511

FIGURE 3 Structures of vitamins K and E and of the related ubiquinone (coenzyme Q) and plastoquinone.

FIGURE 4 Four components of the vitamin B complex: riboflavin, nicotinamide, biotin, pantothenic acid, and the acyl
carrier carnitine. Thiamin (vitamin B 1 , Fig. 2) is also a member of the B complex. Carnitine, which has an essential
acyl carrier function in the human body, is a vitamin for flour beetles.