title: Superheated water extraction of cholesterol from solid food.
abstract: A method based on superheated water extraction has been developed for the removal of cholesterol from solid food thus providing a clean approach by avoiding the use of organic solvents. A preconcentration step was also studied with the aim of solving the problem derived from low-cholesterol-content samples and dilution effect. The research also involved the optimisation of the parameters affecting the extraction process by a central composite experimental design as well as a univariate study of the optimisation of the preconcentration step. The time required for total removal of the target compound was 60 min. The method was validated using a certified reference material (NIST-CRM 1845) and was used to analyse food samples within a wide range of cholesterol concentrations. The efficiency for the CRM was 105%. The precision of the method yielded values less than 6.5% (expressed as relative standard deviation) in all instances.
authors.affiliation: Department of Analytical Chemistry, Annex C-3, Campus of Rabanales, University of Córdoba, Spain.
authors.forename: V
authors.initials: V
authors.lastname: Fernández-Pérez
authors.forename: M D Luque
authors.initials: MD
authors.lastname: de Castro
mesh_terms: D005591:Chemical Fractionation / Q000379:methods; D002784:Cholesterol / Q000032:analysis / Q000302:isolation & purification*; D004867:Equipment Design; D005504:Food Analysis / Q000379:methods*; D006358:Hot Temperature; D012015:Reference Standards; D015203:Reproducibility of Results; D013995:Time; D014867:Water
chemical_list: D014867:Water; D002784:Cholesterol