Similarity index and soap forming capacity in milk fat- and OPO-containing infant formulas

Fat blends used in infant formulas (IFs) are designed according to the legally required total fatty acid (FA) composition. However, regional distribution of FAs on the sn-2 and sn-1/3 positions of the glycerol backbone in triglycerides is very important for the final functional (nutritional) properties of the fat. The regional distribution of FA in bovine milk fat- (MF) and OPO-containing IFs was compared in terms of similarity index, and "potential" soap forming capacity (SFC) as defined by the amount of long chain saturated FA on the sn-1/3 position that is linked to measured soaps in infant stools from an in vivo trial including IF with and without MF. Both MF- and OPO-type of ingredients can be used to improve similarity with human milk fat structure and to optimise potential soap formation: OPO is a more targeted approach on specific FAs; MF provides a wider range of FAs at the desired sn-positions.