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Article

Analyte Quantity Detection from Lateral Flow Assay Using a Smartphone

1
Department of Electrical & Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA
2
Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Korea
3
Nanobiotechnology and Bioinformatics (Major), University of Science & Technology (UST), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2019, 19(21), 4812; https://doi.org/10.3390/s19214812
Received: 24 October 2019 / Revised: 29 October 2019 / Accepted: 30 October 2019 / Published: 5 November 2019
(This article belongs to the Section Biosensors)
Lateral flow assay (LFA) technology has recently received interest in the biochemical field since it is simple, low-cost, and rapid, while conventional laboratory test procedures are complicated, expensive, and time-consuming. In this paper, we propose a robust smartphone-based analyte detection method that estimates the amount of analyte on an LFA strip using a smartphone camera. The proposed method can maintain high estimation accuracy under various illumination conditions without additional devices, unlike conventional methods. The robustness and simplicity of the proposed method are enabled by novel image processing and machine learning techniques. For the performance analysis, we applied the proposed method to LFA strips where the target analyte is albumin protein of human serum. We use two sets of training LFA strips and one set of testing LFA strips. Here, each set consists of five strips having different quantities of albumin—10 femtograms, 100 femtograms, 1 picogram, 10 picograms, and 100 picograms. A linear regression analysis approximates the analyte quantity, and then machine learning classifier, support vector machine (SVM), which is trained by the regression results, classifies the analyte quantity on the LFA strip in an optimal way. Experimental results show that the proposed smartphone application can detect the quantity of albumin protein on a test LFA set with 98% accuracy, on average, in real time. View Full-Text
Keywords: LFA pad; analyte detection; smartphone; LFA reader LFA pad; analyte detection; smartphone; LFA reader
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MDPI and ACS Style

Foysal, K.H.; Seo, S.E.; Kim, M.J.; Kwon, O.S.; Chong, J.W. Analyte Quantity Detection from Lateral Flow Assay Using a Smartphone. Sensors 2019, 19, 4812. https://doi.org/10.3390/s19214812

AMA Style

Foysal KH, Seo SE, Kim MJ, Kwon OS, Chong JW. Analyte Quantity Detection from Lateral Flow Assay Using a Smartphone. Sensors. 2019; 19(21):4812. https://doi.org/10.3390/s19214812

Chicago/Turabian Style

Foysal, Kamrul H.; Seo, Sung E.; Kim, Min J.; Kwon, Oh S.; Chong, Jo W. 2019. "Analyte Quantity Detection from Lateral Flow Assay Using a Smartphone" Sensors 19, no. 21: 4812. https://doi.org/10.3390/s19214812

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