However, HPLC-based direct determination of phytosterols in milk samples is a challenge due to the presence of interferences. Typically, the phytosterol analysis in milk begins with microextraction ...

M. Menéndez-Carreño, H. Steenbergen, H.-G. Janssen, Development and validation of a comprehensive two-dimensional gas chromatography–mass spectrometry method for the analysis of phytosterol oxidation ...

Percentage cholesterol absorption determined by gas chromatography/mass spectrometry was 26.0% lower with the phytosterol-abundant diet relative to the phytosterol-poor diet (P<0.0001, Table 3).