Publicação
Development of label-free plasmonic Au-TiO2 thin film immunosensor devices
| Resumo: | This work reports on the development of a label-free immunosensor technology, based on nanoplasmonic Au-TiO2 thin films. The Au-TiO2 thin films were prepared by cost-effective reactive DC magnetron sputtering, followed by a thermal annealing procedure. The latter promoted the growth of the Au nanoparticles throughout the TiO2 matrix and induced some morphological changes, which are the base for the immunosensor device functionality. A posterior plasma etching treatment was required to partially expose the nanoparticles to the biological environment. It gave rise to a 6-fold increase of the total area of gold exposed, allowing further possibilities for the sensor sensitivity enhancement. Experimental results demonstrated the successful functionalization of the films' surface with antibodies, with the immobilization occurring preferentially in the exposed nanoparticles and negligibly on the TiO2 matrix. Antibody adsorption surface coverage studies revealed antibody low affinity to the film's surface. Nevertheless, immunoassay development experiments showed a strong and active immobilized antibody monolayer at an optimized antibody concentration. This allowed a 236 signal-to-noise-ratio in a confocal microscope, using mouse IgG and 100 ng/ml of Fab-specific anti-mouse IgG-FITC conjugated. Label-free detection of the optimized antibody monolayer on Au-TiO2 thin films was also tested, revealing an expected redshift in the LSPR band, which demonstrates the suitability for the development of cost-effective, label-free LSPR based immunosensor devices. |
|---|---|
| Autores principais: | Barbosa, Ana Isabel Ferreira |
| Outros Autores: | Borges, Joel Nuno Pinto; Meira, Diana Isabela Faria; Costa, Diogo Emanuel Carvalho; Rodrigues, Marco S.; Rebelo, Rita Daniela Nogueira; Correlo, V. M.; Vaz, F.; Reis, R. L. |
| Assunto: | Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| Ano: | 2019 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| _version_ | 1866876037927796736 |
|---|---|
| author | Barbosa, Ana Isabel Ferreira |
| author2 | Borges, Joel Nuno Pinto Meira, Diana Isabela Faria Costa, Diogo Emanuel Carvalho Rodrigues, Marco S. Rebelo, Rita Daniela Nogueira Correlo, V. M. Vaz, F. Reis, R. L. |
| author2_role | author author author author author author author author |
| author_facet | Barbosa, Ana Isabel Ferreira Borges, Joel Nuno Pinto Meira, Diana Isabela Faria Costa, Diogo Emanuel Carvalho Rodrigues, Marco S. Rebelo, Rita Daniela Nogueira Correlo, V. M. Vaz, F. Reis, R. L. |
| author_role | author |
| contributor_name_str_mv | Universidade do Minho |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Barbosa, Ana Isabel Ferreira\"},{\"Person.name\":\"Borges, Joel Nuno Pinto\"},{\"Person.name\":\"Meira, Diana Isabela Faria\"},{\"Person.name\":\"Costa, Diogo Emanuel Carvalho\"},{\"Person.name\":\"Rodrigues, Marco S.\"},{\"Person.name\":\"Rebelo, Rita Daniela Nogueira\"},{\"Person.name\":\"Correlo, V. M.\"},{\"Person.name\":\"Vaz, F.\"},{\"Person.name\":\"Reis, R. L.\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Universidade do Minho |
| datacite.creators.creator.creatorName.fl_str_mv | Barbosa, Ana Isabel Ferreira Borges, Joel Nuno Pinto Meira, Diana Isabela Faria Costa, Diogo Emanuel Carvalho Rodrigues, Marco S. Rebelo, Rita Daniela Nogueira Correlo, V. M. Vaz, F. Reis, R. L. |
| datacite.date.Accepted.fl_str_mv | 2019-07-01T00:00:00Z |
| datacite.date.embargoed.fl_str_mv | 10000-01-01T00:00:00Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_16ec |
| datacite.subjects.subject.fl_str_mv | Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| datacite.titles.title.fl_str_mv | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| dc.contributor.none.fl_str_mv | Universidade do Minho |
| dc.creator.none.fl_str_mv | Barbosa, Ana Isabel Ferreira Borges, Joel Nuno Pinto Meira, Diana Isabela Faria Costa, Diogo Emanuel Carvalho Rodrigues, Marco S. Rebelo, Rita Daniela Nogueira Correlo, V. M. Vaz, F. Reis, R. L. |
| dc.date.Accepted.fl_str_mv | 2019-07-01T00:00:00Z |
| dc.date.embargoed.fl_str_mv | 10000-01-01T00:00:00Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | https://hdl.handle.net/1822/60703 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | Elsevier |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_16ec |
| dc.subject.none.fl_str_mv | Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| dc.title.fl_str_mv | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | This work reports on the development of a label-free immunosensor technology, based on nanoplasmonic Au-TiO2 thin films. The Au-TiO2 thin films were prepared by cost-effective reactive DC magnetron sputtering, followed by a thermal annealing procedure. The latter promoted the growth of the Au nanoparticles throughout the TiO2 matrix and induced some morphological changes, which are the base for the immunosensor device functionality. A posterior plasma etching treatment was required to partially expose the nanoparticles to the biological environment. It gave rise to a 6-fold increase of the total area of gold exposed, allowing further possibilities for the sensor sensitivity enhancement. Experimental results demonstrated the successful functionalization of the films' surface with antibodies, with the immobilization occurring preferentially in the exposed nanoparticles and negligibly on the TiO2 matrix. Antibody adsorption surface coverage studies revealed antibody low affinity to the film's surface. Nevertheless, immunoassay development experiments showed a strong and active immobilized antibody monolayer at an optimized antibody concentration. This allowed a 236 signal-to-noise-ratio in a confocal microscope, using mouse IgG and 100 ng/ml of Fab-specific anti-mouse IgG-FITC conjugated. Label-free detection of the optimized antibody monolayer on Au-TiO2 thin films was also tested, revealing an expected redshift in the LSPR band, which demonstrates the suitability for the development of cost-effective, label-free LSPR based immunosensor devices. |
| dirty | 0 |
| eu_rights_str_mv | restrictedAccess |
| format | article |
| fulltext.url.fl_str_mv | https://prod-dspace.uminho.pt/bitstreams/73b84069-5a4d-4bcb-959c-d4e14838b91c/download |
| id | rum_d5a7a5ae405b2aa3c6c5939c8a2cc7c2 |
| identifier.url.fl_str_mv | https://hdl.handle.net/1822/60703 |
| instacron_str | repositorium |
| institution | Universidade do Minho |
| instname_str | Universidade do Minho |
| language | eng |
| network_acronym_str | rum |
| network_name_str | RepositóriUM - Universidade do Minho |
| oai_identifier_str | oai:repositorium.uminho.pt:1822/60703 |
| organization_str_mv | urn:organizationAcronym:repositorium |
| person_str_mv | Barbosa, Ana Isabel Ferreira Borges, Joel Nuno Pinto Meira, Diana Isabela Faria Costa, Diogo Emanuel Carvalho Rodrigues, Marco S. Rebelo, Rita Daniela Nogueira Correlo, V. M. Vaz, F. Reis, R. L. |
| publishDate | 2019 |
| publisher.none.fl_str_mv | Elsevier |
| reponame_str | RepositóriUM - Universidade do Minho |
| repository_id_str | urn:repositoryAcronym:rum |
| service_str_mv | urn:repositoryAcronym:rum |
| spelling | engElsevierporThis work reports on the development of a label-free immunosensor technology, based on nanoplasmonic Au-TiO2 thin films. The Au-TiO2 thin films were prepared by cost-effective reactive DC magnetron sputtering, followed by a thermal annealing procedure. The latter promoted the growth of the Au nanoparticles throughout the TiO2 matrix and induced some morphological changes, which are the base for the immunosensor device functionality. A posterior plasma etching treatment was required to partially expose the nanoparticles to the biological environment. It gave rise to a 6-fold increase of the total area of gold exposed, allowing further possibilities for the sensor sensitivity enhancement. Experimental results demonstrated the successful functionalization of the films' surface with antibodies, with the immobilization occurring preferentially in the exposed nanoparticles and negligibly on the TiO2 matrix. Antibody adsorption surface coverage studies revealed antibody low affinity to the film's surface. Nevertheless, immunoassay development experiments showed a strong and active immobilized antibody monolayer at an optimized antibody concentration. This allowed a 236 signal-to-noise-ratio in a confocal microscope, using mouse IgG and 100 ng/ml of Fab-specific anti-mouse IgG-FITC conjugated. Label-free detection of the optimized antibody monolayer on Au-TiO2 thin films was also tested, revealing an expected redshift in the LSPR band, which demonstrates the suitability for the development of cost-effective, label-free LSPR based immunosensor devices.application/pdfporDevelopment of label-free plasmonic Au-TiO2 thin film immunosensor devicesBarbosa, Ana Isabel FerreiraBorges, Joel Nuno PintoMeira, Diana Isabela FariaCosta, Diogo Emanuel CarvalhoRodrigues, Marco S.Rebelo, Rita Daniela NogueiraCorrelo, V. M.Vaz, F.Reis, R. L.HostingInstitutionOrganizationalUniversidade do Minhoe-mailmailto:repositorium@usdb.uminho.ptrepositorium@usdb.uminho.ptISSNIsPartOf0928-4931DOIIsPartOf10.1016/j.msec.2019.03.0292019-072019-07-01T00:00:00Z10000-01-01T00:00:00ZHandlehttps://hdl.handle.net/1822/60703http://purl.org/coar/access_right/c_16ecrestricted accessNanoplasmonic Au-TiO2 thin filmsPlasma treatmentImmunosensorAntibody immobilizationLocalized Surface Plasmon ResonanceNanoplasmonic Au-TiO thin films 21504847 bytesliteraturehttp://purl.org/coar/resource_type/c_6501journal articlehttp://purl.org/coar/access_right/c_f1cfapplication/pdffulltexthttps://prod-dspace.uminho.pt/bitstreams/73b84069-5a4d-4bcb-959c-d4e14838b91c/download |
| spellingShingle | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices Barbosa, Ana Isabel Ferreira Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| status | SINGLETON |
| subject.fl_str_mv | Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| title | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| title_full | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| title_fullStr | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| title_full_unstemmed | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| title_short | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| title_sort | Development of label-free plasmonic Au-TiO2 thin film immunosensor devices |
| topic | Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| topic_facet | Nanoplasmonic Au-TiO2 thin films Plasma treatment Immunosensor Antibody immobilization Localized Surface Plasmon Resonance Nanoplasmonic Au-TiO thin films 2 |
| url | https://hdl.handle.net/1822/60703 |
| visible | 1 |