Optical detection of phenolic compounds based on the surface plasmon resonance band of Au nanoparticles.
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.
Nezhad
M Reza Hormozi
MR
Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran. hormozi@sharif.edu
Alimohammadi
M
M
Tashkhourian
J
J
Razavian
S Mehdi
SM
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
D002396:Catechols; D006873:Hydroquinones; D011748:Pyrogallol; D014867:Water; D019800:Phenol; D006046:Gold; C034221:catechol; C031927:hydroquinone