Sensitive and robust methods for the analysis of phthalates in food are clearly needed to protect the end consumer from food adulteration and phthalate migration from FCMs. One of the major challenges for laboratories that will be required to test for phthalates in food commodities is the analysis of fatty matrices such as cooking oils. These are complex mixtures of triacyl glycerides that are difficult to chromatograph and present a challenge to the selectivity, sensitivity, and robustness for GC-MS analysis.