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A cup of sour red cherries provides 793 micrograms of beta-carotene, while a cup of sweet cherries has only 52 micrograms. Citrus. Among citrus fruits, pink or red grapefruits have the most beta-carotene, offering 844 micrograms per half of one fruit; white grapefruit has only 17 micrograms of beta-carotene per half fruit. A medium-sized tangerine has 136 micrograms of beta-carotene, while a medium-sized orange contains 93 micrograms and a half-cup of canned mandarin oranges packed in fruit juice and drained has 282 micrograms. Lemons and limes contain negligible amounts of beta-carotene. Tropical. A cup of fresh passion fruit has 1,753 micrograms of beta-carotene.
Beta-carotene is one of the orange dyes found in most green leaves, and in carrots. When leaves lose their chlorophyll in the fall, carotene is one of the colors left over in the leaf. Beta-carotene is a member of a family of molecules known as the carotenoids. These have a basic structure made up of isoprene units.