Lower quantitative results by transition from 7890A-GC/5975C-MSD to Intuvo9000-GC/5977B-MSD

Hi,

I am experiencing that my quantitative analysis of phytanic acid and very long chain FAs get lower quantitative results compared to the older instalment.This is especially significant with phytanic acid. What difference between the instruments might cause it? 

Old instalment: 7890A-GC/5975C-MSD

New instalment: Intuvo9000-GC/5977B-MSD 

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