Determination of β-Galactooligosaccharides (GOS) in Infant Formula: Collaborative Study, Final Action 2021.01.

Thirteen laboratories reported acceptable results for practice sample 1. Practice sample 2 could only be delivered to eight of the laboratories due to restrictions at customs. The 13 laboratories successfully analyzing practice sample 1 were requested to continue with the analysis of the MLT samples. Laboratory 14 was unable to solve some technical difficulties, so their data could not be used. Out of the seven samples tested, results for six infant formula met the requirements of the AOAC SMPR 2014.003, with RSDr ranging from 1.4 to 4.7% and RSDR ranging from 8.1 to 11.6%. The adult nutritional sample returned results outside the range of SPMR, having repeatability (RSDr) of 9.9%, higher than the SMPR target of ≤ 6%, and reproducibility (RSDR) of 12.1%, just above the SMPR target of ≤ 12%.