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IRON AND FOOD
PLAN
The amount of iron you need? Iron in food. Hem and non hem iron. Iron in plants. Iron in animals.
The amount of iron you need?
Iron in food
Iron in food
Iron in food
Heme and non-heme iron
Heme iron: iron atom contained in the center of a large organic ring. Present in the hemoglobin and myoglobin that is in blood => iron in foods from animals is heme iron. High absorption at all times.
Non-heme iron: iron in food from plants, eggs,... The body absorbs more when it is low in iron and less when it already has plenty of iron.
Hydroponics
Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil, since plants absorb essential mineral nutrients as inorganic ions in water
Pb : roots are the only source of iron => May imply iron chlorosis (that makes plant die)
Differences between plants
Barley is resistant to iron deficiency and grows well on iron rich soils
Rice is sensitive to iron deficiency
Solution : Addition of mugeneic acid to barley roots in hydroponics stimulates iron uptake 30 X
Iron toxicity in rice
In Africa, iron (Fe) toxicity is widespread in rice
Daily eaten food Soils derived from iron-rich rocks
inundated with water Fe III reduced to Fe II, which is readily
taken up by rice roots Brown spots Brown-orange colouring of the leaves
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