title: SOI nanowire for the high-sensitive detection of HBsAg and α-fetoprotein.
abstract: Silicon-on-isolator-nanowires (SOI-NWs) were used for the label-free, real-time biospecific detection of the hepatitis B marker HBsAg and cancer marker α-fetoprotein (AFP). Specific protein-protein recognition was carried out using individual NWs that were functionalized with antibodies. To solve the problem of non-specific binding of target protein molecules to the sensor element the use of a reference NW with immobilized antibodies against non-target proteins was proposed. Using individual SOI-NW surface functionalization allowed the fabrication of a NW array, containing working NWs and reference NWs within one chip. It was shown that this approach allows us to reach a detection limit up to 10(-14) and 10(-15) M for HBsAg and AFP, respectively. Our investigations also allowed us to reveal the influence of the charged state of the target protein molecules and antibodies in solutions with various pH values on the target protein detection limit. A high sensitivity NW-detector is of interest for the creation of diagnosticums for hepatitis B and for the early stages of cancer diseases.
authors.affiliation: Institute of Biomedical Chemistry RAMS, Russia, Moscow.
authors.forename: Yuri D
authors.initials: YD
authors.lastname: Ivanov
authors.forename: Tatyana O
authors.initials: TO
authors.lastname: Pleshakova
authors.forename: Andrey F
authors.initials: AF
authors.lastname: Kozlov
authors.forename: Kristina A
authors.initials: KA
authors.lastname: Malsagova
authors.forename: Nikolay V
authors.initials: NV
authors.lastname: Krohin
authors.forename: Victoria V
authors.initials: VV
authors.lastname: Shumyantseva
authors.forename: Ivan D
authors.initials: ID
authors.lastname: Shumov
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Popov
authors.forename: Olga V
authors.initials: OV
authors.lastname: Naumova
authors.forename: Boris I
authors.initials: BI
authors.lastname: Fomin
authors.forename: Dmitry A
authors.initials: DA
authors.lastname: Nasimov
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Aseev
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Archakov
mesh_terms: D000818:Animals; D014408:Biomarkers, Tumor / Q000378:metabolism*; D015374:Biosensing Techniques / Q000379:methods*; D017097:Electric Impedance; D006509:Hepatitis B / Q000378:metabolism; D006514:Hepatitis B Surface Antigens / Q000378:metabolism*; D006801:Humans; D053770:Nanowires / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D000509:alpha-Fetoproteins / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D006514:Hepatitis B Surface Antigens; D000509:alpha-Fetoproteins; D012825:Silicon