Bioavailability of caseinophosphopeptide-bound iron

Area of Science:

• Nutritional Science
• Biochemistry
• Human Physiology

Background:

• Iron deficiency is a prevalent global nutritional deficit.
• Dietary iron, particularly from cow milk, often has low bioavailability.
• Caseinophosphopeptides (CPPs) derived from casein can enhance iron solubility and absorption.

Purpose of the Study:

• To evaluate the in vivo iron absorption and tissue uptake of iron bound to beta-casein (1-25) phosphopeptide (beta-CN (1-25)-Fe).
• To compare the efficacy of beta-CN (1-25)-Fe with control substances in iron absorption and tissue distribution.
• To investigate the metabolic fate of absorbed iron from beta-CN (1-25)-Fe in humans.

Main Methods:

• Utilized radiolabeled iron (iron 59) to trace absorption and tissue uptake.
• Employed a vascularized rat loop model to assess in vivo iron absorption.
• Conducted a study in young women administering beta-CN (1-25)-Fe in cow milk to evaluate metabolism.

Main Results:

• Beta-CN (1-25)-Fe demonstrated superior absorption and tissue uptake compared to ferric ascorbate in the rat model.
• In humans, beta-CN (1-25)-Fe showed significantly higher transient tissue uptake than ferrous sulfate.
• Iron absorption from beta-CN (1-25)-Fe was not significantly different from ferrous sulfate in women.

Conclusions:

• Iron bound to beta-CN (1-25) phosphopeptide is efficiently absorbed and distributed to tissues.
• The enhanced tissue uptake suggests iron is utilized for metabolic purposes.
• Beta-CN (1-25)-Fe represents a promising strategy for improving iron bioavailability and addressing iron deficiency.