TY - JOUR
T1 - Selective detection of l-tyrosine in the presence of ascorbic acid, dopamine, and uric acid at poly(thionine)-modified glassy carbon electrode
AU - Rahman, Md Mahbubur
AU - Lopa, Nasrin Siraj
AU - Kim, Kyuwon
AU - Lee, Jae Joon
N1 - Publisher Copyright:
© 2015 Published by Elsevier B.V.
PY - 2015/7/18
Y1 - 2015/7/18
N2 - Abstract A simple, sensitive, and selective electrochemical sensor for the detection of l-tyrosine (Tyr) in the presence of ascorbic acid (AA), dopamine (DA), and uric acid (UA) at physiological pH in phosphate buffer solution (PBS) was developed based on a poly(thionine)-modified anodized glassy carbon electrode (PTH/AGCE). The PTH/AGCE resolved the voltammetric signals of AA, DA, UA, and Tyr with peak potential separations (ΔEp) of ca. 157, 135, and 325 mV between AA-DA, DA-UA, and UA-Tyr, respectively, with high sensitivity. The bare GCE and anodized GCE also resolved the Tyr oxidation signals from the interferents but the sensitivity was quite low. The PTH/AGCE sensor exhibited excellent selectivity towards Tyr detection in the presence of higher concentrations of AA, DA, and UA. The differential current responses increased linearly with increasing Tyr concentration in the range of 1 to 250 μM. The sensitivity and detection limit (S/N = 3) were found to be 1.05 μA/cm2/μM and 0.57 μM, respectively. The sensor exhibited excellent stability and reproducibility and could detect the Tyr concentration in human serum samples with excellent recoveries.
AB - Abstract A simple, sensitive, and selective electrochemical sensor for the detection of l-tyrosine (Tyr) in the presence of ascorbic acid (AA), dopamine (DA), and uric acid (UA) at physiological pH in phosphate buffer solution (PBS) was developed based on a poly(thionine)-modified anodized glassy carbon electrode (PTH/AGCE). The PTH/AGCE resolved the voltammetric signals of AA, DA, UA, and Tyr with peak potential separations (ΔEp) of ca. 157, 135, and 325 mV between AA-DA, DA-UA, and UA-Tyr, respectively, with high sensitivity. The bare GCE and anodized GCE also resolved the Tyr oxidation signals from the interferents but the sensitivity was quite low. The PTH/AGCE sensor exhibited excellent selectivity towards Tyr detection in the presence of higher concentrations of AA, DA, and UA. The differential current responses increased linearly with increasing Tyr concentration in the range of 1 to 250 μM. The sensitivity and detection limit (S/N = 3) were found to be 1.05 μA/cm2/μM and 0.57 μM, respectively. The sensor exhibited excellent stability and reproducibility and could detect the Tyr concentration in human serum samples with excellent recoveries.
KW - Differential pulse voltammetry
KW - Glassy carbon electrode
KW - Interference-free signal
KW - Poly(thionine)
KW - Tyrosine
UR - http://www.scopus.com/inward/record.url?scp=84937220064&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2015.06.018
DO - 10.1016/j.jelechem.2015.06.018
M3 - Article
AN - SCOPUS:84937220064
SN - 1572-6657
VL - 754
SP - 87
EP - 93
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
M1 - 2165
ER -