DU Fang-jing, HU Xiao-qin, SONG Ke, et al. Research on electrochemical impedance sensor for p53 tumor suppressor gene[J]. 2015, 34(1): 60-62+65. DOI: 10.13873/J.1000-9787(2015)01-0060-03.
A novel DNA sensor is designed for the determination of p53 tumor suppressor gene based on electrochemical impedance technology. First a thiol-end probe p53-DNA is immobilized onto the surface of gold electrode through the self-assembly technique
The electron transfer resistance of the DNA sensor is changed after the hybridization of complementary sequence p53-DNA
p53 tumor suppressor gene is quantitatively detected by the change in electron transfer resistance
in 5 mmol / L K3[Fe( CN)6
]
-5 mmol/L K4[Fe( CN)6
]
( p H = 7. 4)solution
under the optimized conditions
the electrochemical impedance response is linear with the logarithm of the p53-DNA concentration from 1. 0 × 10- 8
1. 0 × 10- 6mol / L with a detection limit of 3. 0 × 10- 9mol / L( S / N =3). 11 times parallel determination is carried out on target p53-DNA of 5. 0 × 10- 8mol / L
relation standard deviation( RSD) is 3. 4 %. The sensor has advantages of easy fabrication