Quantification of caprylyl glycol (1,2-octanediol) by GC/FID


I have to quantify caprylyl glycol (1,2-octanediol) in cosmetics samples (emulsion) by GC/FID.

Calibration : I made dilutions of the caprylyl glycol in water. 

Samples : Dilutions are more difficulted because of the sample matrix. 

I tried to make my dilutions in water and I used a filter but I'm not sure if all the caprylyl glycol is in my sample.

Do you have idea? 

Thank you, 

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