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Johansson TB, Davtyan R, Valderas-Gutiérrez J, Gonzalez Rodriguez A, Agnarsson B, Munita R, Fioretos T, Lilljebjörn H, Linke H, Höök F, Prinz CN. Sub-Nanomolar Detection of Oligonucleotides Using Molecular Beacons Immobilized on Lightguiding Nanowires. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:453. [PMID: 38470783 DOI: 10.3390/nano14050453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 02/15/2024] [Accepted: 02/17/2024] [Indexed: 03/14/2024]
Abstract
The detection of oligonucleotides is a central step in many biomedical investigations. The most commonly used methods for detecting oligonucleotides often require concentration and amplification before detection. Therefore, developing detection methods with a direct read-out would be beneficial. Although commonly used for the detection of amplified oligonucleotides, fluorescent molecular beacons have been proposed for such direct detection. However, the reported limits of detection using molecular beacons are relatively high, ranging from 100 nM to a few µM, primarily limited by the beacon fluorescence background. In this study, we enhanced the relative signal contrast between hybridized and non-hybridized states of the beacons by immobilizing them on lightguiding nanowires. Upon hybridization to a complementary oligonucleotide, the fluorescence from the surface-bound beacon becomes coupled in the lightguiding nanowire core and is re-emitted at the nanowire tip in a narrower cone of light compared with the standard 4π emission. Prior knowledge of the nanowire positions allows for the continuous monitoring of fluorescence signals from each nanowire, which effectively facilitates the discrimination of signals arising from hybridization events against background signals. This resulted in improved signal-to-background and signal-to-noise ratios, which allowed for the direct detection of oligonucleotides at a concentration as low as 0.1 nM.
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Affiliation(s)
- Therese B Johansson
- Division of Solid State Physics, Lund University, 221 00 Lund, Sweden
- NanoLund, Lund University, 221 00 Lund, Sweden
| | - Rubina Davtyan
- Division of Solid State Physics, Lund University, 221 00 Lund, Sweden
- NanoLund, Lund University, 221 00 Lund, Sweden
| | - Julia Valderas-Gutiérrez
- Division of Solid State Physics, Lund University, 221 00 Lund, Sweden
- NanoLund, Lund University, 221 00 Lund, Sweden
| | | | - Björn Agnarsson
- Division of Nano and Biophysics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Roberto Munita
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, 221 00 Lund, Sweden
| | - Thoas Fioretos
- Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, 221 00 Lund, Sweden
| | - Henrik Lilljebjörn
- Division of Clinical Genetics, Department of Laboratory Medicine, Lund University, 221 00 Lund, Sweden
| | - Heiner Linke
- Division of Solid State Physics, Lund University, 221 00 Lund, Sweden
- NanoLund, Lund University, 221 00 Lund, Sweden
| | - Fredrik Höök
- NanoLund, Lund University, 221 00 Lund, Sweden
- Division of Nano and Biophysics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Christelle N Prinz
- Division of Solid State Physics, Lund University, 221 00 Lund, Sweden
- NanoLund, Lund University, 221 00 Lund, Sweden
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2
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Courtney SJ, Stromberg ZR, Myers y Gutiérrez A, Jacobsen D, Stromberg LR, Lenz KD, Theiler J, Foley BT, Gans J, Yusim K, Kubicek-Sutherland JZ. Optical Biosensor Platforms Display Varying Sensitivity for the Direct Detection of Influenza RNA. BIOSENSORS 2021; 11:367. [PMID: 34677323 PMCID: PMC8534094 DOI: 10.3390/bios11100367] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/28/2021] [Accepted: 09/29/2021] [Indexed: 12/28/2022]
Abstract
Detection methods that do not require nucleic acid amplification are advantageous for viral diagnostics due to their rapid results. These platforms could provide information for both accurate diagnoses and pandemic surveillance. Influenza virus is prone to pandemic-inducing genetic mutations, so there is a need to apply these detection platforms to influenza diagnostics. Here, we analyzed the Fast Evaluation of Viral Emerging Risks (FEVER) pipeline on ultrasensitive detection platforms, including a waveguide-based optical biosensor and a flow cytometry bead-based assay. The pipeline was also evaluated in silico for sequence coverage in comparison to the U.S. Centers for Disease Control and Prevention's (CDC) influenza A and B diagnostic assays. The influenza FEVER probe design had a higher tolerance for mismatched bases than the CDC's probes, and the FEVER probes altogether had a higher detection rate for influenza isolate sequences from GenBank. When formatted for use as molecular beacons, the FEVER probes detected influenza RNA as low as 50 nM on the waveguide-based optical biosensor and 1 nM on the flow cytometer. In addition to molecular beacons, which have an inherently high background signal we also developed an exonuclease selection method that could detect 500 pM of RNA. The combination of high-coverage probes developed using the FEVER pipeline coupled with ultrasensitive optical biosensors is a promising approach for future influenza diagnostic and biosurveillance applications.
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Affiliation(s)
- Samantha J. Courtney
- Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (S.J.C.); (Z.R.S.); (D.J.); (L.R.S.); (K.D.L.)
| | - Zachary R. Stromberg
- Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (S.J.C.); (Z.R.S.); (D.J.); (L.R.S.); (K.D.L.)
| | - Adán Myers y Gutiérrez
- Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (A.M.y.G.); (J.G.)
| | - Daniel Jacobsen
- Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (S.J.C.); (Z.R.S.); (D.J.); (L.R.S.); (K.D.L.)
| | - Loreen R. Stromberg
- Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (S.J.C.); (Z.R.S.); (D.J.); (L.R.S.); (K.D.L.)
| | - Kiersten D. Lenz
- Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (S.J.C.); (Z.R.S.); (D.J.); (L.R.S.); (K.D.L.)
| | - James Theiler
- Space Data Science and Systems, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;
| | - Brian T. Foley
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;
| | - Jason Gans
- Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (A.M.y.G.); (J.G.)
| | - Karina Yusim
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;
| | - Jessica Z. Kubicek-Sutherland
- Physical Chemistry and Applied Spectroscopy, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; (S.J.C.); (Z.R.S.); (D.J.); (L.R.S.); (K.D.L.)
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3
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Novel Photonic Bio-Chip Sensor Based on Strained Graphene Sheets for Blood Cell Sorting. Molecules 2021; 26:molecules26185585. [PMID: 34577055 PMCID: PMC8467184 DOI: 10.3390/molecules26185585] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/03/2021] [Accepted: 09/10/2021] [Indexed: 11/17/2022] Open
Abstract
A photonic biochip with a tunable response in the visible range is suggested for blood cell sorting applications. Multi-layers of ZnS and Ge slabs (as the main building blocks), hosting a cell in which bio-sample could be injected, are considered as the core of the sensor. In order to increase the sensitivity of the chip, the bio-cell is capsulated inside air slabs, and its walls are coated with graphene sheets. Paying special attention to white and red blood components, the optimum values for structural parameters are extracted first. Tunability of the sensor detectivity is then explored by finding the role of the probe light incident angle, as well as its polarization. The strain of the graphene layer and angle in which it is applied are also suggested to further improve the performance tunability. Results reflect that the biochip can effectively identify selected components through their induced different optical features, besides of the different figure of merit and sensitivity amounts that are recorded for them by the sensor.
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Yang Y, Wang Z, Sun F, Tian H. Modeling and design of a coupled PhC slab sensor for simultaneous detection of refractive index and temperature with strong anti-interference ability. OPTICS EXPRESS 2020; 28:22151-22164. [PMID: 32752482 DOI: 10.1364/oe.391680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
In this paper, we propose a coupled-double-photonic-crystal-slab (CDPCS) sensor for simultaneously detecting refractive index (RI) and temperature (T) with high accuracy and strong anti-interference ability, using transverse magnetic-like (TM-like) mode and transverse electric-like (TE-like) mode. Based on the temporal coupled-mode theory, the theoretical model of the structure is established and the transmission formula is derived. The agreement between the theoretical and the simulated transmission spectra is proved. In order to achieve both high quality (Q)-factor and high modulation depth, the structure is optimized by adjusting the geometric parameters. The Q-factors of both TM-like mode and TE-like mode reach a magnitude order of 105. For the dual-parameter sensing, high RI sensitivities of 960 nm/RIU and 210 nm/RIU, and T sensitivities of -66.5 pm/K and 50.75 pm/K, are obtained for TM-like mode and TE-like mode, respectively. The relative deviations of RI and T sensing are as low as 0.6% and 1.0%, respectively, indicating high detection accuracy. Even considering the influence of external interference, the sensor can effectively resist external interference. The proposed CDPCS sensor has remarkable performance improvements in sensitivity, Q-factor, detection accuracy, and anti-interference ability. This study shows great potential in on-chip sensing and multi-parameter detection.
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Continuous Detection of Increasing Concentrations of Thrombin Employing a Label-Free Photonic Crystal Aptasensor. MICROMACHINES 2020; 11:mi11050464. [PMID: 32354154 PMCID: PMC7281654 DOI: 10.3390/mi11050464] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 04/23/2020] [Accepted: 04/27/2020] [Indexed: 02/07/2023]
Abstract
Thrombin generation is a complex and finely regulated pathway that provokes dynamical changes of thrombin concentration in blood when a vascular injury occurs. In order to characterize the initiation phase of such process, when thrombin concentration is in the nM range, a label-free optical aptasensor is proposed here. This aptasensor combines a 1D photonic crystal structure consisting of a silicon corrugated waveguide with thrombin binding aptamers on its surface as bioreceptors. As a result, this aptasensor has been demonstrated to specifically detect thrombin concentrations ranging from 270 pM to 27 nM with an estimated detection limit of 33.5 pM and a response time of ~2 min. Furthermore, it has also been demonstrated that this aptasensor is able to continuously respond to consecutive increasing concentrations of thrombin and to detect binding events as they occur. All these features make this aptasensor a good candidate to continuously study how thrombin concentration progressively increases during the initiation phase of the coagulation cascade.
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Pastor-Navarro B, García-Flores M, Fernández-Serra A, Blanch-Tormo S, Martínez de Juan F, Martínez-Lapiedra C, Maia de Alcantara F, Peñalver JC, Cervera-Deval J, Rubio-Briones J, García-Rupérez J, López-Guerrero JA. A Tetra-Panel of Serum Circulating miRNAs for the Diagnosis of the Four Most Prevalent Tumor Types. Int J Mol Sci 2020; 21:ijms21082783. [PMID: 32316350 PMCID: PMC7215589 DOI: 10.3390/ijms21082783] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 04/09/2020] [Accepted: 04/15/2020] [Indexed: 12/18/2022] Open
Abstract
The purpose of this study is to clinically validate a series of circulating miRNAs that distinguish between the 4 most prevalent tumor types (lung cancer (LC); breast cancer (BC); colorectal cancer (CRC); and prostate cancer (PCa)) and healthy donors (HDs). A total of 18 miRNAs and 3 housekeeping miRNA genes were evaluated by qRT-PCR on RNA extracted from serum of cancer patients, 44 LC, 45 BC, 27 CRC, and 40 PCa, and on 45 HDs. The cancer detection performance of the miRNA expression levels was evaluated by studying the area under the curve (AUC) of receiver operating characteristic (ROC) curves at univariate and multivariate levels. miR-21 was significantly overexpressed in all cancer types compared with HDs, with accuracy of 67.5% (p = 0.001) for all 4 tumor types and of 80.8% (p < 0.0001) when PCa cases were removed from the analysis. For each tumor type, a panel of miRNAs was defined that provided cancer-detection accuracies of 91%, 94%, 89%, and 77%, respectively. In conclusion, we have described a series of circulating miRNAs that define different tumor types with a very high diagnostic performance. These panels of miRNAs would constitute the basis of different approaches of cancer-detection systems for which clinical utility should be validated in prospective cohorts.
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Affiliation(s)
- Belén Pastor-Navarro
- Laboratory of Molecular Biology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (B.P.-N.); (M.G.-F.); (A.F.-S.)
| | - María García-Flores
- Laboratory of Molecular Biology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (B.P.-N.); (M.G.-F.); (A.F.-S.)
- IVO-CIPF Joint Research Unit of Cancer, Príncipe Felipe Research Center (CIPF), 46012 Valencia, Spain
| | - Antonio Fernández-Serra
- Laboratory of Molecular Biology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (B.P.-N.); (M.G.-F.); (A.F.-S.)
- IVO-CIPF Joint Research Unit of Cancer, Príncipe Felipe Research Center (CIPF), 46012 Valencia, Spain
| | - Salvador Blanch-Tormo
- Department of Medical Oncology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain;
| | - Fernando Martínez de Juan
- Unit of Gastroenterology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (F.M.d.J.); (C.M.-L.); (F.M.d.A.)
| | - Carmen Martínez-Lapiedra
- Unit of Gastroenterology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (F.M.d.J.); (C.M.-L.); (F.M.d.A.)
| | - Fernanda Maia de Alcantara
- Unit of Gastroenterology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (F.M.d.J.); (C.M.-L.); (F.M.d.A.)
| | - Juan Carlos Peñalver
- Department of Thoracic Surgery, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain;
| | - José Cervera-Deval
- Department of Radiology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain;
| | - José Rubio-Briones
- Department of Urology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain;
| | - Jaime García-Rupérez
- Nanophotonics Technology Center, Universitat Politècnica de València, 46022 Valencia, Spain;
| | - José Antonio López-Guerrero
- Laboratory of Molecular Biology, Fundación Instituto Valenciano de Oncología, 46009 Valencia, Spain; (B.P.-N.); (M.G.-F.); (A.F.-S.)
- IVO-CIPF Joint Research Unit of Cancer, Príncipe Felipe Research Center (CIPF), 46012 Valencia, Spain
- Department of Pathology, School of Medicine, Catholic University of Valencia ‘San Vicente Mártir’, 46001 Valencia, Spain
- Correspondence: ; Tel.: +34-961114337; +34-961104039
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7
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Bañuls MJ, González-Martínez MÁ, Sabek J, García-Rupérez J, Maquieira Á. Thiol-click photochemistry for surface functionalization applied to optical biosensing. Anal Chim Acta 2019; 1060:103-113. [DOI: 10.1016/j.aca.2019.01.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 01/18/2019] [Accepted: 01/27/2019] [Indexed: 10/27/2022]
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8
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Gonçalves OSL, Wheeler G, Dalmay T, Dai H, Castro M, Castro P, García-Rupérez J, Ruiz-Tórtola Á, Griol A, Hurtado J, Bellieres L, Bañuls MJ, González D, López-Guerrero JA, Neves-Petersen MT. Detection of miRNA cancer biomarkers using light activated Molecular Beacons. RSC Adv 2019; 9:12766-12783. [PMID: 35515856 PMCID: PMC9063790 DOI: 10.1039/c9ra00081j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 04/07/2019] [Indexed: 12/29/2022] Open
Abstract
Early detection of cancer biomarkers can reduce cancer mortality rate. miRNAs are small non-coding RNAs whose expression changes upon the onset of various types of cancer. Biosensors that specifically detect such biomarkers can be engineered and integrated into point-of-care devices (POC) using label-free detection, high sensibility and compactness. In this paper, a new engineered Molecular Beacon (MB) construct used to detect miRNAs is presented. Such a construct is immobilized onto biosensor surfaces in a covalent and spatially oriented way using the photonic technology Light Assisted Molecular Immobilization (LAMI). The construct consists of a Cy3 labelled MB covalently attached to a light-switchable peptide. One MB construct contains a poly-A sequence in its loop region while the other contains a sequence complementary to the cancer biomarker miRNA-21. The constructs have been characterized by UV-Vis spectroscopy, mass spectrometry and HPLC. LAMI led to the successful immobilization of the engineered constructs onto thiol functionalized optically flat quartz slides and Silicon on Insulator (SOI) sensor surfaces. The immobilized Cy3 labelled MB construct has been imaged using confocal fluorescence microscopy (CFM). The bioavailability of the immobilized engineered MB biosensors was confirmed through specific hybridization with the Cy5 labelled complementary sequence and imaged by CFM and FRET. Hybridization kinetics have been monitored using steady state fluorescence spectroscopy. The label-free detection of miRNA-21 was also achieved by using integrated photonic sensing structures. The engineered light sensitive constructs can be immobilized onto thiol reactive surfaces and are currently being integrated in a POC device for the detection of cancer biomarkers. Photonic based detection strategies of cancer miRNA biomarkers after Light Assisted Molecular Immobilization (LAMI) of peptide-MB biosensor constructs.![]()
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Sabek J, Díaz-Fernández FJ, Torrijos-Morán L, Díaz-Betancor Z, Maquieira Á, Bañuls MJ, Pinilla-Cienfuegos E, García-Rupérez J. Experimental study of an evanescent-field biosensor based on 1D photonic bandgap structures. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:967-974. [PMID: 31165023 PMCID: PMC6541322 DOI: 10.3762/bjnano.10.97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 04/18/2019] [Indexed: 05/03/2023]
Abstract
A photonic bandgap (PBG) biosensor has been developed for the label-free detection of proteins. As the sensing in this type of structures is governed by the interaction between the evanescent field going into the cladding and the target analytes, scanning near-field optical microscopy has been used to characterize the profile of that evanescent field. The study confirms the strong exponential decrease of the signal as it goes into the cladding. This means that biorecognition events must occur as close to the PBG structure surface as possible in order to obtain the maximum sensing response. Within this context, the PBG biosensor has been biofunctionalized with half-antibodies specific to bovine serum albumin (BSA) using a UV-induced immobilization procedure. The use of half-antibodies allows one to reduce the thickness of the biorecognition volume down to ca. 2.5 nm, thus leading to a higher interaction with the evanescent field, as well as a proper orientation of their binding sites towards the target sample. Then, the biofunctionalized PBG biosensor has been used to perform a direct and real-time detection of the target BSA antigen.
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Affiliation(s)
- Jad Sabek
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | | | - Luis Torrijos-Morán
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Zeneida Díaz-Betancor
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Ángel Maquieira
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - María-José Bañuls
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Elena Pinilla-Cienfuegos
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Jaime García-Rupérez
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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10
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Sabek J, Torrijos-Morán L, Griol A, Díaz Betancor Z, Bañuls Polo MJ, Maquieira Á, García-Rupérez J. Real Time Monitoring of a UV Light-Assisted Biofunctionalization Protocol Using a Nanophotonic Biosensor. BIOSENSORS-BASEL 2018; 9:bios9010006. [PMID: 30598030 PMCID: PMC6468802 DOI: 10.3390/bios9010006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 12/12/2018] [Accepted: 12/24/2018] [Indexed: 12/27/2022]
Abstract
A protocol for the covalent biofunctionalization of silicon-based biosensors using a UV light-induced thiol–ene coupling (TEC) reaction has been developed. This biofunctionalization approach has been used to immobilize half antibodies (hIgG), which have been obtained by means of a tris(2-carboxyethyl)phosphine (TCEP) reduction at the hinge region, to the surface of a vinyl-activated silicon-on-insulator (SOI) nanophotonic sensing chip. The response of the sensing structures within the nanophotonic chip was monitored in real time during the biofunctionalization process, which has allowed us to confirm that the bioconjugation of the thiol-terminated bioreceptors onto the vinyl-activated sensing surface is only initiated upon UV light photocatalysis.
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Affiliation(s)
- Jad Sabek
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Luis Torrijos-Morán
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Amadeu Griol
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Zeneida Díaz Betancor
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - María-José Bañuls Polo
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Ángel Maquieira
- Departamento de Química, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico IDM, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
| | - Jaime García-Rupérez
- Nanophotonics Technology Center, Universitat Politècnica de València, Camí de Vera s/n, 46022 Valencia, Spain.
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11
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Ruiz-Tórtola Á, Prats-Quílez F, González-Lucas D, Bañuls MJ, Maquieira Á, Wheeler G, Dalmay T, Griol A, Hurtado J, Bohlmann H, Götzen R, García-Rupérez J. Experimental study of the evanescent-wave photonic sensors response in presence of molecular beacon conformational changes. JOURNAL OF BIOPHOTONICS 2018; 11:e201800030. [PMID: 29664230 DOI: 10.1002/jbio.201800030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 04/12/2018] [Indexed: 05/20/2023]
Abstract
An experimental study of the influence of the conformational change suffered by molecular beacon (MB) probes-upon the biorecognition of nucleic acid target oligonucleotides over evanescent wave photonic sensors-is reported. To this end, high sensitivity photonic sensors based on silicon photonic bandgap (PBG) structures were used, where the MB probes were immobilized via their 5' termination. Those MBs incorporate a biotin moiety close to their 3' termination in order to selectively bind a streptavidin molecule to them. The different photonic sensing responses obtained toward the target oligonucleotide detection, when the streptavidin molecule was bound to the MB probes or not, demonstrate the conformational change suffered by the MB upon hybridization, which promotes the displacement of the streptavidin molecule away from the surface of the photonic sensing structure.
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Affiliation(s)
- Ángela Ruiz-Tórtola
- Nanophotonics Technology Center, Universitat Politècnica de València, Valencia, Spain
| | | | - Daniel González-Lucas
- Departamento de Química, IDM, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico, Universitat Politècnica de València, Valencia, Spain
| | - María-José Bañuls
- Departamento de Química, IDM, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico, Universitat Politècnica de València, Valencia, Spain
| | - Ángel Maquieira
- Departamento de Química, IDM, Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico, Universitat Politècnica de València, Valencia, Spain
| | - Guy Wheeler
- School of Biological Sciences, University of East Anglia, Norwich, UK
| | - Tamas Dalmay
- School of Biological Sciences, University of East Anglia, Norwich, UK
| | - Amadeu Griol
- Nanophotonics Technology Center, Universitat Politècnica de València, Valencia, Spain
| | - Juan Hurtado
- Nanophotonics Technology Center, Universitat Politècnica de València, Valencia, Spain
| | - Helge Bohlmann
- microTEC Gesellschaft für Mikrotechnologie mbH, Duisburg, Germany
| | - Reiner Götzen
- microTEC Gesellschaft für Mikrotechnologie mbH, Duisburg, Germany
| | - Jaime García-Rupérez
- Nanophotonics Technology Center, Universitat Politècnica de València, Valencia, Spain
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