carotene
Carotene is a biomaterial that is a carbon-based polymer substance, in which a single bond and a double bond alternate between carbon atoms. Beta-carotene is a precursor of vitamin A, and one molecule of beta carotene turns into two molecules of vitamin A in vivo as needed. Carotene is called α, β, γ, δ, ε, ζ-carotene depending on the shape of both ends. For reference, when a series of biochemical reactions changes from A to B, and B to C, the substance A or B, referred to as C, is referred to as a precursor. The single bond and the double bond are combined to form a composite bond structure. That is, in practice, single bonds and double bonds do not exist alternately, but parallel pi bonds have a structure with long compound bonds. Spectroscopy absorbs blue light and reflects red light, so it is yellowish. In the case of beta carotene, it is often found in fruits such as carrots and fruits and apricots.