title: Rapid-response and highly sensitive noncross-linking colorimetric nitrite sensor using 4-aminothiophenol modified gold nanorods.
abstract: A novel colorimetric nitrite ion sensor was developed utilizing 4-aminothiophenol (4-ATP) modified gold nanorods (GNR). In the presence of nitrite ions, the deamination reaction was induced by heating the 4-ATP modified GNR in ethanol solution, resulting in the reduction of the GNR surface charges, which led to aggregation of GNRs and a colorimetric response that was quantitatively correlated to the concentration of nitrite ions. This simple assay was rapid (<or=10 min) and highly sensitive (<1 ppm of nitrite), and it can be used for rapid monitoring of drinking water quality.
authors.affiliation: Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: Nan
authors.initials: N
authors.lastname: Xiao
authors.forename: Chenxu
authors.initials: C
authors.lastname: Yu
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods; D003124:Colorimetry; D003432:Cross-Linking Reagents; D006046:Gold / Q000737:chemistry*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D009573:Nitrites / Q000032:analysis*; D012680:Sensitivity and Specificity; D013438:Sulfhydryl Compounds; D013997:Time Factors
chemical_list: D000814:Aniline Compounds; D003432:Cross-Linking Reagents; D009573:Nitrites; D013438:Sulfhydryl Compounds; D006046:Gold; C064316:4-aminothiophenol