Corandomization of fats improves absorption in rats

Area of Science:

• Nutritional Biochemistry
• Lipid Metabolism
• Human Milk Composition

Background:

• Human milk fat is highly absorbable despite high long-chain saturated fatty acids (LCSFA).
• Palmitic acid is predominantly esterified at the sn-2 position in human milk triglycerides (70%).
• This sn-2 esterification enhances absorption compared to infant formulas (10-15%).

Purpose of the Study:

• To investigate the impact of sn-2 palmitic acid content on fat absorption.
• To evaluate the efficacy of chemical randomization in improving fat absorption from common infant formula oils.

Main Methods:

• Rats were fed mixtures of coconut oil and palm olein with varying sn-2 LCSFA proportions.
• Chemical randomization redistributed fatty acids to all triglyceride positions.
• Fecal fatty acid excretion was measured to assess absorption efficiency.

Main Results:

• Randomization of coconut oil and palm olein mixtures significantly improved fatty acid absorption in rats.
• Corandomized oils showed 30-60% less fecal excretion of total fatty acids (primarily LCSFA).
• Increased sn-2 LCSFA proportion correlates with enhanced fat absorption.

Conclusions:

• The sn-2 position of palmitic acid is crucial for efficient fat absorption.
• Chemical randomization of oils can enhance the absorption of LCSFA in infant formulas.
• Optimizing triglyceride structure may improve infant nutrition and reduce malabsorption issues.