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Simultaneous Determination of Cholesterol and Phytosterol in Foods by Gas Chromatography

CHEN Yuexiao, HE Tao, TANG Lingxuan, XU Jiajia, BAI Shasha, CUI Yajuan, HE Mei, LI Dong, HUANG Hua, LU Yong   

  1. 1. Beijing Research Institute for Nutritional Resources, Beijing 100069, China;
    2. Beijing Municipal Center for Food Safety Monitoring and Risk Assessment, Beijing 100041, China
  • Online:2016-07-25 Published:2016-07-26
  • Contact: CUI Yajuan

Abstract:

A method for the simultaneous determination of phytosterol and cholesterol in foods was established by gas
chromatography (GC) in this research. Cholesterol, brassicasterol, campesterol, stigmasterol, β-sitosterol, and stigmasterol
were quantified using 5α-cholestane as the internal reference standard. Samples were saponified before extraction and the
extract was concentrated and diluted again with n-heptane before being injected into the chromatographic system. The results
showed that cholesterol and phytosterols were separated well and displayed linear relationship over the concentration range
of 0.001–2.5 mg/mL. The limit of detection (LOD) and limit of quantitation (LOQ) of this method were 0.3 and 1.0 mg/100 g,
respectively. Compared with high performance liquid chromatography (HPLC), the GC method could effectively separate
cholesterol and phytosterols, with simpler operation, better reproducibility, and higher accuracy and sensitivity.

Key words: gas chromatography, cholesterol, phytosterol

CLC Number: