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Determination of Sterols in Dairy Products and Vegetable Fats by HPLC and GC Methods

Author

Listed:
  • I. Borkovcová
  • E. Janoušková

    (Department of Milk Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences in Brno, 612 42 Brno, Czech Republic, *E-mail: borkovcovai@vfu.cz)

  • M. Dračková

    (Department of Milk Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences in Brno, 612 42 Brno, Czech Republic, *E-mail: borkovcovai@vfu.cz)

  • B. Janštová

    (Department of Milk Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences in Brno, 612 42 Brno, Czech Republic, *E-mail: borkovcovai@vfu.cz)

  • L. Vorlová

    (Department of Milk Hygiene and Technology, University of Veterinary and Pharmaceutical Sciences in Brno, 612 42 Brno, Czech Republic, *E-mail: borkovcovai@vfu.cz)

Abstract

Cholesterol concentrations in goat milk, goat milk cheeses, ewe's milk, ewes milk cheeses, dairy bioproducts, and concentrations of cholesterol, stigmasterol and sitosterol in butter, butter with added vegetable fats and margarines were evaluated by RP HPLC method. Parallel analyses by capillary GC were performed. Prior to the final chromatographic analyses the saponification step was used, followed by the extraction of the unsaponificable residue into n-hexane. Parameters of RP HPLC method were compared with parameters of GC determination. The detection limits (LOD) determinated on the bases of blank samples analysis were 5.2 mg/kg for cholesterol, 4.8 mg/kg for stigmasterol and 14.7 mg/kg for sitosterol. Recovery ranged between 80-92%, repeatibility expressed as RSD of 12 parallel samples measurements was 4.2-6.8%. Accuracy tested on the SRM 1845 Whole Egg Powder (NIST) was 95.7%.

Suggested Citation

  • I. Borkovcová & E. Janoušková & M. Dračková & B. Janštová & L. Vorlová, 2009. "Determination of Sterols in Dairy Products and Vegetable Fats by HPLC and GC Methods," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 27(SpecialIs), pages 217-219.
    • Handle: RePEc:caa:jnlcjf:v:27:y:2009:i:specialissue1:id:1073-cjfs
    DOI: 10.17221/1073-CJFS
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