: Carotenoids, one class of natural pigments, are ubiquitous in the world of plant and animal organisms. They are red, yellow or orange in color. In the past few years only plants or microorganisms could synthesize this kind of natural biomaterials. Carotenoids can interact with proteins, DNA, polysaccharides and other biomolecules, playing diverse functions, which include light harvesting, photo protection, stabilization of cell membrane, and prevention of some chronic diseases. One of very important carot...