Abstract |
A novel potentiometric immunosensor for detection of hepatitis B surface antigen ( HBsAg) has been developed by means of self-assembly (SA) and opposite-charged adsorption (OCA) techniques to immobilize hepatitis B surface antibody (HBsAb) on a platinum electrode. A cleaned platinum electrode was first pretreated in the presence of 10% HNO3 and 2.5% K2CrO4 solution and held at -1.5 V (vs SCE) for 1 min to make it negatively charged and then immersed in a mixing solution containing hepatitis B surface antibody, colloidal gold (Au), and polyvinyl butyral (PVB). Finally, HBsAb was successfully immobilized onto the surface of the negatively charged platinum electrode modified nanosized gold and PVB sol-gel matrixes. The modified procedure was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The immobilized hepatitis B surface antibody exhibited direct electrochemical behavior toward hepatitis B surface antigen ( HBsAg). The performance and factors influencing the performance of the resulting immunosensor were studied in detail. More than 95.7% of the results of the human serum samples obtained by this method were in agreement with those obtained by enzyme-linked immunosorbent assays (ELISAs). The resulting immunosensor exhibited fast potentiometric response (<3 min) to HBsAg. The detection limit of the immunosensor was 2.3 ng.mL(-1), and the linear range was from 8 to 1280 ng.mL(-1). Moreover, the studied immunosensor exhibited high sensitivity, good reproducibility, and long-term stability (>6 months).
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Authors | Ruo Yuan, Dianping Tang, Yaqin Chai, Xia Zhong, Yan Liu, Jianyuan Dai |
Journal | Langmuir : the ACS journal of surfaces and colloids
(Langmuir)
Vol. 20
Issue 17
Pg. 7240-5
(Aug 17 2004)
ISSN: 0743-7463 [Print] United States |
PMID | 15301511
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Colloids
- Hepatitis B Antibodies
- Polyvinyls
- Platinum
- Gold
- polyvinylbutyral
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Topics |
- Adsorption
- Biosensing Techniques
(instrumentation, methods)
- Colloids
(chemistry)
- Electrodes
- Gold
(chemistry)
- Hepatitis B Antibodies
(chemistry)
- Humans
- Hydrogen-Ion Concentration
- Platinum
(chemistry)
- Polyvinyls
(chemistry)
- Potentiometry
(instrumentation, methods)
- Sensitivity and Specificity
- Serum
(chemistry)
- Surface Properties
- Time Factors
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