micellemediated extraction for concentrating hydrophobic organic compounds an extraction method based on polymerinduced phase separation of aqueous micellar solutions of octylbetadthioglucoside otg was assessed for concentrating hydrophobic analytes various hydrophobic compounds such as polycyclicaromatic hydrocarbons alkylbenzenes alkylphenols chlorobenzenes chlorophenols phthalic esters pesticides and steroid hormones could be efficiently concentrated into a small volume of surfactantrich phase while hydrophilic matrix components remained in the bulk aqueous phase the surfactantrich phase containing concentrated otg could be directly introduced into the hygroorganic mobile phase of highperformance liquid chromatography with ultraviolet photometric detection the application of this method greatly enhanced the signal intensity in the chromatogram while reducing the interference of matrix components