I have been using alkanes mix for identification of compounds. Why the RI values (reference) for the file 'all records with Kovats RI' are higher than ADAMS records?
Example: Limonene MS-DIAL: RI (ref) 1233 ADAMS: RI (ref) 1029.5
I have been using a mass spectrometer Shimadzu GCMS-QP2010MS-DIAL for GC-MS-based untargeted metabolomics. I have two questions about processing by MS-DIAL: - For compounds identification, what is the best MSP file? - What "RI tolerance" should I use?