title: A giant magnetoimpedance-based biosensor for sensitive detection of Escherichia coli O157:H7.
abstract: A giant magnetoimpedance (GMI)-based biosensor was developed for detection of Escherichia coli (E. coli) O157: H7. The GMI sensor involving the sensing elements of Cr/Cu/NiFe/Cu/NiFe was fabricated by Micro Electro-Mechanical system (MEMS) technology, including thick photoresist lithography and electroplating. A separate Au film substrate as immunoplatform was used to capture E. coli O157:H7. The monoclonal mouse anti-E. coli antibody was immobilized on Au film substrate surface with a self-assembled layer. The different concentration E. coli O157:H7 (100, 300 and 500 cfu/ml) were combined with Dynabeads-antibody conjugates (DAC) respectively. DAC were prepared by conjugating streptavidin-coupled Dynabeads with biotin-labeled polyclonal mouse anti-E. coli antibodies. The classical sandwich assay was used for detection of E. coli O157:H7 targeted with Dynabeads by using antibody-antigen pair combination of biotin-streptavidin. The fundamental principle for detection of E. coli O157:H7 based on GMI sensor was that Dynabeads were employed as magnetic labels of E. coli O157:H7, and E. coli O157:H7 can be monitored by detecting the fringe field of Dynabeads using magnetic sensing elements. We observed that the GMI ratio were significantly improved due to the presence of E. coli O157:H7 combined with Dynabeads. The GMI ratio increased as the E. coli O157:H7 concentration increased. A lower detectable concentration of 100 cfu/ml was achieved in present work. The GMI-based biosensor provides a new method to rapid and sensitive detection E. coli O157:H7, which has a large potential for bio-application.
authors: Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Department of Micro/Nano Electronics, School of electronic information and electrical engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai, 200240, People's Republic of China.
authors: Zhen
authors: Z
authors: Yang
authors: Xue-Cheng
authors: XC
authors: Sun
authors: Tao
authors: T
authors: Wang
authors: Chong
authors: C
authors: Lei
authors: Yan
authors: Y
authors: Liu
authors: Yong
authors: Y
authors: Zhou
authors: Jian
authors: J
authors: Lei
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000737:chemistry; D058846:Antibodies, Monoclonal, Murine-Derived / Q000737:chemistry; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods*; D017097:Electric Impedance; D019453:Escherichia coli O157; D006046:Gold / Q000737:chemistry; D006801:Humans; D060526:Magnetic Fields; D008567:Membranes, Artificial; D051379:Mice
chemical_list: D000907:Antibodies, Bacterial; D058846:Antibodies, Monoclonal, Murine-Derived; D008567:Membranes, Artificial; D006046:Gold