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The heme iron serves as a source or sink of electrons during electron transfer or redox chemistry. In peroxidase reactions, the porphyrin molecule also serves as an electron source, being able to delocalize radical electrons in the conjugated ring. In the transportation or detection of diatomic gases, the gas binds to the heme iron.
Heme iron is derived directly from hemoglobin and myoglobin in animal foods, such as meat, poultry and fish. As a result, it is readily absorbed and utilized by the body.
That’s because there are two types of iron: heme and nonheme. Meat, seafood, and poultry contain both forms, while plant-based or fortified foods contain only nonheme.
Iron from different foods is absorbed and processed differently by the body; for instance, iron in meat (heme iron source) is more easily absorbed than iron in grains and vegetables ("non-heme" iron sources). [30] Minerals and chemicals in one type of food may also inhibit absorption of iron from another type of food eaten at the same time. [31]
Heme iron in animals is from blood and heme-containing proteins in meat and mitochondria, whereas in plants, heme iron is present in mitochondria in all cells that use oxygen for respiration. Like most mineral nutrients, the majority of the iron absorbed from digested food or supplements is absorbed in the duodenum by enterocytes of the ...
The best food source of iron is red meat, which contains heme, Ardehali said, adding that it can be hard to get enough iron in a diet without meat. ... Iron-fortified foods, such as cereals.
For this study, researchers focused specifically on non-heme iron, which is found in both plant and animal products and makes up about 90% of iron a person consumes through food. “Iron is a ...
Roughly 5 grams of iron are present in the human body and is the most abundant trace metal. [1] It is absorbed in the intestine as heme or non-heme iron depending on the food source. Heme iron is derived from the digestion of hemoproteins in meat. [4] Non-heme iron is mainly derived from plants and exist as iron(II) or iron(III) ions. [4]