An Optical Immunosensor Based on Surface Plasmon Resonance for Human cTnI Determination
Human cardiac troponin I (cTnI) is a specific protein of cardiac muscle. The detection of the content of cTnI in human serum shows high specificity for diagnosing acute myocardial infarction. For preparation of diagnostic reagents of myocardial infarction, cTnI is isolated directly from human cardiac muscle by skeletal TnC-sepharose 4B affinity chromatographic column. The molecular weight and the amino acid composition of isolated cTnI is consistent with reference. A novel optical biosensor based on simultaneous multiwave-length detected surface plasmon resonance (SPR) has been developed for monitoring cTnI. The sensor is designed on the basis of fixing angle of incidence and measuring the reflected intensities in the wavelength range of 400-800 nm. The SPR spectra are shown in terms of reflected light intensity verus wavelength of incident light. The intensity of the reflected light is the minimum at the resonant wavelength. Molecular self-assembling in solution is used to form the sensing membrane on the gold substrate. The processes of sensing monolayer formation were studied in real time through observing the change of resonant wavelength. The modified surface was used as a model immunosensor and successfully detected cTnI. cTnC was detected in the concentration range from 0.143～50 μg/mL. Under optimum experimental conditions, the sensor has a good repeatability, reversibility and selectivity.
Surface plasmon resonance immunosensor cTnI
Wei Jin Ying Mu Qinhan Jin Daqian Song Jingyan Wei Hanqi Zhang Xiaochen Lin
Research Center for Analytical Instrumentation, College of Information Science and Engineering, Zhej College of Chemistry, Jilin University, P. R. China College of Animal Science and Veterinary Medicine, Jilin University, P. R. China
国际会议
上海
英文
1628-1631
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）