title: Detection of influenza virus by a biosensor based on the method combining electrochemiluminescence on binary SAMs modified Au electrode with an immunoliposome encapsulating Ru (II) complex.
abstract: Recently, point of care testing (POCT) used for diagnosis of influenza infection has a problem showing false negative diagnosis because of the low sensitivity. We would like to report detection of influenza virus A (H1N1) by an immunosensor based on electrochemiluminescence (ECL) that uses an immunoliposome encapsulating tris(2,2'-bipyridyl)ruthenium(II) complex. By using the sensor, we could detect the virus that competed with hemagglutinin (HA) peptide immobilized on self-assembled monolayers (SAMs) in immunoreaction of the antibody bound on the surface of liposome. The HA peptide was 19 mer (TGLRNGITNKVNSVIEKAA). We demonstrated great improvement of sensitivity and accuracy by introducing binary SAMs instead of mono SAMs. The binary SAMs was prepared from 3,3'-dithiodipropionic acid and 1-hexanethiol. Use of the binary SAMs enabled to increase the SAMs coverage on Au electrode; the fact was confirmed by observation of the cathodic desorption currents. By using such an electrode, first the detection method of BSA was optimized to lower ECL background signal. Then we applied the method to the detection of influenza virus. We could successfully detect the virus with higher sensitivity compared with that by POCT and ELISA. The detection range was from a concentration of 2.7 × 10(2) to 2.7 × 10(3) PFU/mL.
authors.affiliation: Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima, 727-0023, Japan.
authors.forename: Yumi
authors.initials: Y
authors.lastname: Katayama
authors.affiliation: Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima, 727-0023, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ohgi
authors.affiliation: Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima, 727-0023, Japan.
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Mitoma
authors.affiliation: Research Center for Applied Medical Engineering, Oita University, 700 Dannoharu, Oita, 870-1192, Japan.
authors.forename: Emi
authors.initials: E
authors.lastname: Hifumi
authors.affiliation: Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima, 727-0023, Japan. negasira@pu-hiroshima.ac.jp.
authors.forename: Naoyoshi
authors.initials: N
authors.lastname: Egashira
mesh_terms: D000818:Animals; D055910:Antibodies, Immobilized / Q000737:chemistry; D015374:Biosensing Techniques / Q000379:methods*; D002417:Cattle; D006388:Hemagglutinins / Q000737:chemistry; D006801:Humans; D055767:Immobilized Proteins / Q000737:chemistry; D007118:Immunoassay / Q000379:methods; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000175:diagnosis / Q000821:virology; D008081:Liposomes / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D009942:Organometallic Compounds / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry; D012680:Sensitivity and Specificity; D012710:Serum Albumin, Bovine / Q000032:analysis
chemical_list: D055910:Antibodies, Immobilized; D006388:Hemagglutinins; D055767:Immobilized Proteins; D008081:Liposomes; D009942:Organometallic Compounds; D010455:Peptides; C415768:tris(2,2'-bipyridyl)ruthenium(II); D012710:Serum Albumin, Bovine
keywords: Electrochemiluminescence; Highly sensitive detection; Immunoliposome; Influenza virus; Self-assembled monolayers