Determination of MOSH/MOAH in Shell SN500* mineral oil

ID 19496 | 25.04.2023

In order to harmonise the determination of the MOAH in infant formulas, a third interlaboratory comparison (JRC IF 2021-03) was organised by the Joint Research Centre (JRC) of the European Commission. This ILC was designed to (i) evaluate the consistency of the reported results for solutions mineral oil in hexane at different concentration levels; and (ii) determine the MOSH/MOAH composition of a specific Shell SN500* mineral oil batch. This batch was used to spike various infant formula materials for the next method validation study, planned for the beginning of 2022.

The QC10 samples provided to the participants consisted of a hexane solution containing the Shell SN500* mineral oil. Participants were requested to perform four different dilutions and to quantify and report MOSH and MOAH concentrations.

Thirty participants from eight European countries reported results. Six of them reported consistent results for the various dilutions, and provided proper recoveries. These results were selected for the characterisation of the MOSH and MOAH percent composition in QC10.

The following “reference” values were derived: MOSH % in SN500* = 60.1 ± 2.1 % (k=2) and MOAH % in SN500* = 34.5 ± 1.2 % (k=2). In addition, the major MOSH and MOAH fractions in SN500* were identified.

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Table of Contents

Executive summary

1 Introduction

2 Scope

3 Set-up of the exercise

4 Results and Discussions
4.1 Results
4.2 Evaluation of the instrumental performance
4.3 Characterisation of Shell SN500 for the batch used for spiking of the IF and for QC10 preparation
4.1 Questionnaire

5 Conclusions
Annex 1: Invitation letter
Annex 2. Instructions to the participants
Annex 3. Confirmation of receipt
Annex 4: Reported concentration of total MOAH (C10-C50) in QC10-1, 2, 3, 4
Annex 5: Reported concentrations of total MOSH (C10-50) in QC10-1, 2, 3, 4, expressed in mg L-1
Annex 6: Reported concentrations of MOAH fractions in QC10-4, expressed in mg L-1
Annex 7: Reported concentrations of MOSH fractions in QC10-4, expressed in mg L-1
Annex 8: Calculated total MOAH (C10-C50) % composition in Shell SN500 in QC10-1 to 4
Annex 9: Calculated total MOSH (C10-C50) % composition in Shell SN500 in QC10-1 to 4
Annex 10: Calculated % recoveries of total (MOSH+MOAH) in QC10-1 to QC10-4.

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Fonte: JRC (Joint Research Centre) - EC 2022

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