A capacitive biosensor was developed for the medical diagnosis of menginitis by detection of S100B protein in the patient cerebrospinal fluid (CSF). S100 protein is a calcium-binding protein and consists of two monomers, and it is overproduced during gliosis in patients with Alzheimer disease, Down syndrome and related dementia. Therefore, overproduction of S100B protein was reported to implicate the developmental brain dysfunction. In this work, a capacitive biosensor based on chronoamperometry was applied for the detection of S100B protein. For the improvement of the capacitive biosensor, the outer membrane (OM) layer with autodisplayed Z-domains was used to immobilize anti-S100B protein. In the previous work, we reported that the immunoaffinity layer based on the OM layer could far improve the sensitivity and limit of detection of immunoassays through the orientation control of the immobilized antibodies. For the comparison of sensitivity, different immunoaffinity layers were prepared: self-assembled monolayer (SAM) of 11-mercaptoundecanoic acid combined with covalent coupling of anti-S100B antibodies, physical adsorption of antibodies to the electrode surface. The immunoassay by using the OM layer with Z-domains showed the limit of detection was improved as much as 100-fold higher than the conventional SAM. For the capacitive sensor based on the OM layer with autodisplayed Z-domains, a standard curve at the S100B protein concentration of 1 pg/ml – 10 ng/ml was prepared by using standard samples by spiking S100B protein to CSF. The feasibility of the capacitive biosensor for the medical diagnosis was confirmed by comparison with the test results (n=20) from the conventional immunoassay.
키워드
s100bcapacitive biosensorouter membrane
저자
Ju-Kyung LEE [ School of Advanced Material Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, Korea. ]
Jae-Chul PYUN [ School of Advanced Material Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, Korea. ]
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
이 법인은 생물 공학의 발전과 보급에 이바지하고, 회원 상호 간의 연구 협력과 친목을 도모함을 목적으로 한다
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