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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Sensors and Materials, Volume 33, Number 12(4) (2021)
Copyright(C) MYU K.K.
pp. 4383-4397
S&M2769 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2021.3613
Published: December 27, 2021

Demonstration of Particle–Substrate Surface Interaction Analysis Based on Brownian Motion and Gravitational Testing [PDF]

Mao Otake and Yoshiaki Ukita

(Received September 1, 2021; Accepted December 21, 2021)

Keywords: bead-based bioassay, physical adsorption, DLVO theory, Brownian motion, image analysis

In this paper, we propose a simple method for analyzing interface interactions in bead-based bioassay. Although bead-based bioassay enables simple and rapid quantitative evaluation of target substances, non-specific adsorption between the beads or between the beads and a substrate affects the reliability of measurement. Conventional methods for evaluating non-specific adsorption include a method in which a magnetic force or shearing force is applied to beads to prevent non-specific adsorption, but the experimental system is complicated. Therefore, a simpler evaluation method would be useful for carrying out a systematic study to find optimal conditions for the suppression of non-specific adsorption. Therefore, we devised a new adhesion behavior analysis method based on simple force application by gravity and the observation of Brownian motion. The analysis results obtained by the devised method were considered on the basis of DLVO (Derjaguin–Landau–Verwey–Overbeek) theory, which is the adhesion theory of solid surfaces, and the main factors contributing to non-specific adsorption were identified. Furthermore, changes in adhesion behavior with ionic strength, bead size, and reaction time were investigated. The results provide useful information for optimizing the experimental system in bead-based bioassay and are expected to improve the reliability of bioassay.

Corresponding author: Yoshiaki Ukita


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This work is licensed under a Creative Commons Attribution 4.0 International License.

Cite this article
Mao Otake and Yoshiaki Ukita, Demonstration of Particle–Substrate Surface Interaction Analysis Based on Brownian Motion and Gravitational Testing, Sens. Mater., Vol. 33, No. 12, 2021, p. 4383-4397.

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