Determination of melamine based on electrochemiluminescence of Ru(bpy)3(2+) at bare and single-wall carbon nanotube modified glassy carbon electrodes.
The electrochemiluminescence (ECL) of Ru(bpy)(3)(2+) at bare and single-wall carbon nanotube (SWNT) modified glassy carbon (GC) electrodes has been employed for the determination of melamine for the first time, giving a linear response (R(2) = 0.99682) for melamine concentration from 1.0 × 10(-10) to 1.0 × 10(-5) M at a bare GC electrode in pH 10 borate buffer, and the detection limit is 1.0 × 10(-10) M. However, the detection limit can be reduced further to 1.0 × 10(-13) M after modification of the GC electrode by SWNTs. This is much lower compared to other detection methods. The proposed method was applied to the determination of melamine added to a commercial milk sample; the recovery is quite satisfactory with good reproducibility and stability. All of these results provide the possibility of developing a novel ECL detection method for melamine.
State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, 2 Linggong Road, Ganjingzi District, Dalian 116023, China. liufengyu@dlut.edu.cn
Fengyu
F
Liu
Xue
X
Yang
Shiguo
S
Sun
D000818:Animals; D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D008163:Luminescent Measurements / Q000379:methods*; D008892:Milk / Q000737:chemistry*; D008958:Models, Molecular; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D012680:Sensitivity and Specificity; D014227:Triazines / Q000032:analysis*
D037742:Nanotubes, Carbon; D009942:Organometallic Compounds; D014227:Triazines; C415768:tris(2,2'-bipyridyl)ruthenium(II); D002244:Carbon; C011907:melamine