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Burg S, Roth S, Cohen M, Avivi-Mintz S, Margulis M, Rohana H, Peretz A, Danielli A. High throughput optical modulation biosensing for highly sensitive and rapid detection of biomarkers. Talanta 2022; 248:123624. [PMID: 35660998 DOI: 10.1016/j.talanta.2022.123624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/24/2022] [Accepted: 05/26/2022] [Indexed: 11/24/2022]
Abstract
Rapid, highly sensitive, and high-throughput detection of biomarkers at low concentrations is invaluable for early diagnosis of various diseases. In many highly sensitive immunoassays, magnetic beads are used to capture fluorescently labeled target molecules. The target molecules are then quantified by detecting the fluorescent signal from individual beads, which is time consuming and requires a complicated and expensive detection system. Here, we demonstrate a high-throughput optical modulation biosensing (ht-OMB) system, which uses a small permanent magnet to aggregate the beads into a small detection volume and eliminates background noise by steering a laser beam in and out of the cluster of beads. Shortening the aggregation, acquisition, and well-to-well scanning transition times enables reading a 96-well plate within 10 min. Using the ht-OMB system to detect human Interleukin-8, we demonstrated a limit of detection of 0.14 ng/L and a 4-log dynamic range. Testing 94 RNA extracts from 36 confirmed RT-qPCR SARS-CoV-2-positive patients (Ct≤40) and 58 confirmed RT-qPCR SARS-CoV-2-negative individuals resulted in 100% sensitivity and 100% specificity.
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Affiliation(s)
- Shmuel Burg
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Shira Roth
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Meir Cohen
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Shira Avivi-Mintz
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Michael Margulis
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Hanan Rohana
- The Azrieli Faculty of Medicine, Bar-Ilan University, Safed, 1311502, Israel
| | - Avi Peretz
- The Azrieli Faculty of Medicine, Bar-Ilan University, Safed, 1311502, Israel; Clinical Microbiology Laboratory, The Baruch Padeh Medical Center, Poriya, Tiberias, 1528001, Israel
| | - Amos Danielli
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel.
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Avivi-Mintz S, Lustig Y, Indenbaum V, Schwartz E, Danielli A. Highly Sensitive and Specific SARS-CoV-2 Serological Assay Using a Magnetic Modulation Biosensing System. Biosensors (Basel) 2021; 12:7. [PMID: 35049635 PMCID: PMC8773989 DOI: 10.3390/bios12010007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/05/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
Sensitive serological assays are needed to provide valuable information about acute and past viral infections. For example, detection of anti-severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) IgG antibodies could serve as the basis for an "immunity passport" that would enable individuals to travel internationally. Here, utilizing a novel Magnetic Modulation Biosensing (MMB) system and the receptor-binding domain of the SARS-CoV-2 spike protein, we demonstrate a highly sensitive and specific anti-SARS-CoV-2 IgG serological assay. Using anti-SARS-CoV-2 IgG antibodies, RT-qPCR SARS-CoV-2-positive and healthy patients' samples, and vaccinees' samples, we compare the MMB-based SARS-CoV-2 IgG assay's analytical and clinical sensitivities to those of the enzyme-linked immunosorbent assay (ELISA). Compared with ELISA, the MMB-based assay has an ~6-fold lower limit of detection (129 ng/L vs. 817 ng/L), and it detects an increase in the IgG concentration much earlier after vaccination. Using 85 RT-qPCR SARS-CoV-2-positive samples and 79 -negative samples, the MMB-based assay demonstrated similar clinical specificity (98% vs. 99%) and sensitivity (93% vs. 92%) to the ELISA test, but with a much faster turnaround time (45 min vs. 245 min). The high analytical and clinical sensitivity, short turnaround time, and simplicity of the MMB-based assay makes it a preferred method for antibody detection.
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Affiliation(s)
- Shira Avivi-Mintz
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan 5290002, Israel;
| | - Yaniv Lustig
- Central Virology Laboratory, Israel Ministry of Health, Chaim Sheba Medical Center, Tel-HaShomer, Ramat Gan 5262000, Israel; (Y.L.); (V.I.)
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel;
| | - Victoria Indenbaum
- Central Virology Laboratory, Israel Ministry of Health, Chaim Sheba Medical Center, Tel-HaShomer, Ramat Gan 5262000, Israel; (Y.L.); (V.I.)
| | - Eli Schwartz
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel;
- The Center for Geographic Medicine, Chaim Sheba Medical Center, Tel-Hashomer, Ramat Gan 5262000, Israel
| | - Amos Danielli
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan 5290002, Israel;
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Margulis M, Cohen M, Burg S, Avivi-Mintz S, Danielli A. Optical modulation biosensing system for rapid detection of biological targets at low concentrations. Biomed Opt Express 2021; 12:5338-5350. [PMID: 34692186 PMCID: PMC8515954 DOI: 10.1364/boe.430410] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 06/22/2021] [Accepted: 07/11/2021] [Indexed: 06/13/2023]
Abstract
In many sensitive assays, target molecules are tagged using fluorescently labeled probes and captured using magnetic beads. Here, we introduce an optical modulation biosensing (OMB) system, which aggregates the beads into a small detection area and separates the signal from the background noise by manipulating the laser beam in and out of the cluster of beads. Using the OMB system to detect human interleukin-8, we demonstrated a limit of detection of 0.02 ng/L and a 4-log dynamic range. Using Zika-positive and healthy individuals' serum samples, we show that the OMB-based Zika IgG serological assay has 96% sensitivity and 100% specificity.
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Affiliation(s)
- Michael Margulis
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
- Equal contribution
| | - Meir Cohen
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
- Equal contribution
| | - Shmuel Burg
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Shira Avivi-Mintz
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Amos Danielli
- Faculty of Engineering, The Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
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