Heparin-reduced gold nanoparticles were utilized for the detection of organophosphorous pesticides. Heparin is one of glycosaminoglycans with carboxyl and sulfo groups. It plays an important role as a reducing and stabilizing agent for the synthesis of gold nanoparticles. The reaction conditions were optimized, and high resolution-transmission electron microscopic images revealed gold nanoparticles of various shapes. Malathion, fenthion and methidathion in water were detected by simply mixing with heparin-reduced gold nanoparticles. NaCl induced a color change in the mixed solution from wine-red to purple-blue that was solely dependent on the pesticide concentration in the range of 10�1,000 ppb. In order to prepare solid supports for removing pesticides from the contaminated water, heparin-reduced gold nanoparticles were immobilized on a silica gel matrix The incorporation of atomic gold and heparin bound to 2 g of silica gel was determined 4,058 ppm and 33 �g as measured by inductively coupled plasma�atomic emission spectrometry and carbazole assay, respectively. Fenthion in water was successfully removed by using an AuNPs-immobilized silica gel column.

Detection of organophosphorous pesticides by using heparin-reduced gold nanoparticles

243rd National Meeting (2012)

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