👉 The term "carotenean" refers to a type of amino acid that is found in various types of plant foods, including broccoli, kale, and cauliflower. Carotene is an important antioxidant that helps protect cells from damage caused by free radicals. The specific amino acid responsible for the carotene content varies between different species of plants, but it is typically made up of two copies of a single amino acid (Cys) in one molecule.