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He Q, Li D, He Y, Guan T, Zhang Y, Shen Z, Chen X, Liu S, Lu B, Ji Y. Optical demodulation system for digitally encoded suspension array in fluoroimmunoassay. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-7. [PMID: 28936825 DOI: 10.1117/1.jbo.22.9.097003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 09/05/2017] [Indexed: 06/07/2023]
Abstract
A laser-induced breakdown spectroscopy and fluorescence spectroscopy-coupled optical system is reported to demodulate digitally encoded suspension array in fluoroimmunoassay. It takes advantage of the plasma emissions of assembled elemental materials to digitally decode the suspension array, providing a more stable and accurate recognition to target biomolecules. By separating the decoding procedure of suspension array and adsorption quantity calculation of biomolecules into two independent channels, the cross talk between decoding and label signals in traditional methods had been successfully avoided, which promoted the accuracy of both processes and realized more sensitive quantitative detection of target biomolecules. We carried a multiplexed detection of several types of anti-IgG to verify the quantitative analysis performance of the system. A limit of detection of 1.48×10-10 M was achieved, demonstrating the detection sensitivity of the optical demodulation system.
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Affiliation(s)
- Qinghua He
- Tsinghua University, Department of Physics, Beijing, China
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Dongmei Li
- Tsinghua University, Department of Physics, Beijing, China
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Yonghong He
- Tsinghua University, Department of Physics, Beijing, China
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Tian Guan
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Yilong Zhang
- Tsinghua University, Department of Physics, Beijing, China
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Zhiyuan Shen
- Tsinghua University, Department of Physics, Beijing, China
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Xuejing Chen
- Tsinghua University, Department of Physics, Beijing, China
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Siyu Liu
- Tsinghua University, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of, China
| | - Bangrong Lu
- South China Normal University, School of Physics and Telecommunication Engineering, Guangzhou, China
| | - Yanhong Ji
- South China Normal University, School of Physics and Telecommunication Engineering, Guangzhou, China
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Adbul Rahim NA, Pelet S, Kamm RD, So PTC. Methodological considerations for global analysis of cellular FLIM/FRET measurements. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:026013. [PMID: 22463045 PMCID: PMC3382354 DOI: 10.1117/1.jbo.17.2.026013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 12/18/2011] [Accepted: 12/27/2011] [Indexed: 05/29/2023]
Abstract
Global algorithms can improve the analysis of fluorescence energy transfer (FRET) measurement based on fluorescence lifetime microscopy. However, global analysis of FRET data is also susceptible to experimental artifacts. This work examines several common artifacts and suggests remedial experimental protocols. Specifically, we examined the accuracy of different methods for instrument response extraction and propose an adaptive method based on the mean lifetime of fluorescent proteins. We further examined the effects of image segmentation and a priori constraints on the accuracy of lifetime extraction. Methods to test the applicability of global analysis on cellular data are proposed and demonstrated. The accuracy of global fitting degrades with lower photon count. By systematically tracking the effect of the minimum photon count on lifetime and FRET prefactors when carrying out global analysis, we demonstrate a correction procedure to recover the correct FRET parameters, allowing us to obtain protein interaction information even in dim cellular regions with photon counts as low as 100 per decay curve.
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Affiliation(s)
- Nur Aida Adbul Rahim
- Massachusetts Institute of Technology, Department of Mechanical Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Serge Pelet
- Massachusetts Institute of Technology, Department of Biological Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Roger D. Kamm
- Massachusetts Institute of Technology, Department of Mechanical Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
- Massachusetts Institute of Technology, Department of Biological Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Peter T. C. So
- Massachusetts Institute of Technology, Department of Mechanical Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
- Massachusetts Institute of Technology, Department of Biological Engineering, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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Chapter 12 Reflections on FRET imaging. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/s0075-7535(08)00012-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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