Absorption of iron and trace elements occurs mainly in the duodenum and the upper part of the jejunum. Absorption is more intense, the more deficiency in the body.
Absorption of iron with a deficit of 10-30%, in the absence of a deficit - 5-15%. In addition, it depends on food intake (better - on an empty stomach, in the presence of hydrochloric acid in the stomach). Distribution: bone marrow (transferrin-iron complex), depot (ferritin, hemosiderin) - hepatocytes, reticuloendothelial system, muscle tissue (insignificant amount).Connection with plasma proteins 90% or more (significant - with hemoglobin, less - with myoglobin, transferrin, ferritin, hemosiderin, enzymes). Half-life (iron sulfate alone) - 6 hours. There is no physiological elimination system (high risk of cumulation).
Absorption of manganese - 3-50%, copper - 40-60%. Copper binds to the carrier protein in metallothionein by 90-95%; in ceruloplasmin - 1-2%; the bond with amino acids and albumin is reversible. Deposition: manganese - brain, kidney, pancreas, liver; copper - liver, peripheral tissues (insignificant amount). Biotransformation: copper - in the liver. Elimination: manganese - with feces, copper - with feces, a small amount with kidneys, with sweat and epidermis.