title: Optical detection of phenolic compounds based on the surface plasmon resonance band of Au nanoparticles.
abstract: An indirect colorimetric method is presented for detection of trace amounts of hydroquinone (1), catechol (2) and pyrogallol (3). The reduction of AuCl4(-) to Gold nanoparticles (Au-NPs) by these phenolic compounds in the presence of cetyltrimethylammonium chloride (CTAC) produced very intense surface plasmon resonance peak of Au-NPs. The plasmon absorbance of Au-NPs allows the quantitative colorimetric detection of the phenolic compounds. The calibration curves derived from the changes in absorbance at lambda = 568 nm were linear with concentration of hydroquinone, catechol and pyrogallol in the range of 7.0 x 10(-7) to 1.0 x 10(-4)M, 6.0 x 10(-6) to 2.0 x 10(-4)M and 6.0 x 10(-7) to 1.0 x 10(-4)M, respectively. The detection limits were 5.3 x 10(-7), 2.5 x 10(-6) and 3.2 x 10(-7)M for the hydroquinone, catechol and pyrogallol, respectively. The method was applied satisfactorily to the determination of phenolic compounds in water samples and pharmaceutical formulations.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran. hormozi@sharif.edu
authors.forename: M Reza Hormozi
authors.initials: MR
authors.lastname: Nezhad
authors.forename: M
authors.initials: M
authors.lastname: Alimohammadi
authors.forename: J
authors.initials: J
authors.lastname: Tashkhourian
authors.forename: S Mehdi
authors.initials: SM
authors.lastname: Razavian
mesh_terms: D002138:Calibration; D002396:Catechols / Q000032:analysis / Q000737:chemistry; D003124:Colorimetry / Q000379:methods; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006873:Hydroquinones / Q000032:analysis / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry; D055095:Optics and Photonics; D019800:Phenol / Q000737:chemistry*; D011748:Pyrogallol / Q000032:analysis / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D020349:Surface Plasmon Resonance / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D002396:Catechols; D006873:Hydroquinones; D011748:Pyrogallol; D014867:Water; D019800:Phenol; D006046:Gold; C034221:catechol; C031927:hydroquinone