Application of dopamine as an electroactive ligand for the determination of aluminum in biological fluids.
Dopamine (3,4-dihydroxyphenylethylamine, DA) is applied as an electroactive chelant for indirect determination of aluminum (Al) in biological fluids. It is observed that the decrease of the differential pulse voltammetric (DPV) anodic peak current of DA is linear with the increase of Al concentration. Under optimum experimental conditions (pH 8.6, 2.0 x 10(-4) M DA, and 0.03 M NH4Ac-NH3 x H2O buffer solution), two linear ranges, 5.0 x 10(-8) - 4.0 x 10(-7) M and 4.0 x 10(-7) - 7.2 x 10(-6) M Al(III), are obtained. The detection limit of Al is 1.9 x 10(-8) M and the relative standard deviation for 4 x 10(-6) M Al(III) is 3.1% (N = 8). Many biologically active foreign species have been selected for interference. Excellent recoveries and accuracy have been obtained in the measurements of Al in biological samples such as synthetic renal dialysate, Ringer's solution, human whole blood, cerebrospinal fluid of demented patient, and urine of diabetic patient. The methodological principle that Al complexes with DA on the electroactive position result in the depression of electrochemical activities of DA has been verified by comparing both the electrochemical behaviors and the spectroscopic responses like UV-vis and Raman of DA in the presence and in the absence of Al.
Zhang
Fuping
F
Department of Chemistry, Nanjing University, China.
Bi
Shuping
S
Liu
Jian
J
Yang
Xiaodi
X
Wang
Xianlong
X
Yang
Li
L
Yu
Tsing
T
Chen
Yijun
Y
Dai
Lemei
L
Yang
Tianming
T
D000535:Aluminum / Q000378:metabolism*; D001826:Body Fluids / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism*; D004563:Electrochemistry; D006801:Humans; D008024:Ligands; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013059:Spectrum Analysis, Raman
D008024:Ligands; D000535:Aluminum; D004298:Dopamine