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Comparing the RSDs of normalized MS responsea for the internal standards for GC–MS and GC × GC–MS in all samples (QC and study samples)
| Compound | RSD of MS response (%) | |
|---|---|---|
| GC–MS | GC × GC–MS | |
| Alanine-d4 | 7 | 8 |
| Leucine-d3 | 9 | 8 |
| Glutamic acid-d3 | 17 | 8 |
| Phenylalanine-d5 | 13 | 7 |
| Cholic acid-d4 | 4 | 6 |
aMS responses of the internal standards were corrected for variations in injection volume and MS response by normalization on the response of dicyclohexylphthalate (used as injection standard)
