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Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip

Diatom frustules are a type of natural biomaterials that feature regular shape and intricate hierarchical micro/nano structures. They have shown excellent performance in biosensing, yet few studies have been performed on flow-through detection. In this study, diatom frustules were patterned into ste...

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Detalles Bibliográficos
Autores principales: Wang, Zhenhu, Gong, De, Cai, Jun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8469004/
https://www.ncbi.nlm.nih.gov/pubmed/34577659
http://dx.doi.org/10.3390/mi12091017
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author Wang, Zhenhu
Gong, De
Cai, Jun
author_facet Wang, Zhenhu
Gong, De
Cai, Jun
author_sort Wang, Zhenhu
collection PubMed
description Diatom frustules are a type of natural biomaterials that feature regular shape and intricate hierarchical micro/nano structures. They have shown excellent performance in biosensing, yet few studies have been performed on flow-through detection. In this study, diatom frustules were patterned into step-through holes and bonded with silicon substrate to form an open-ended filtration array. Then they were fixed into a microfluidic chip with a smartphone-based POCT. Human IgG and FITC-labeled goat–anti-human IgG were adopted to investigate the adsorption enhancement when analyte flowed through diatom frustules. The results indicated up to 16-fold enhancement of fluorescent signal sensitivity for the flow-through mode compared with flow-over mode, at a low concentration of 10.0 μg/mL. Moreover, the maximum flow rate reached 2.0 μL/s, which resulted in a significant decrease in the testing time in POCT. The adsorption simulation results of diatom array embedded in the microchannel shows good agreement with experimental results, which further proves the filtration enrichment effect of the diatom array. The methods put forward in this study may open a new window for the application of diatom frustules in biosensing platforms.
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spelling pubmed-84690042021-09-27 Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip Wang, Zhenhu Gong, De Cai, Jun Micromachines (Basel) Article Diatom frustules are a type of natural biomaterials that feature regular shape and intricate hierarchical micro/nano structures. They have shown excellent performance in biosensing, yet few studies have been performed on flow-through detection. In this study, diatom frustules were patterned into step-through holes and bonded with silicon substrate to form an open-ended filtration array. Then they were fixed into a microfluidic chip with a smartphone-based POCT. Human IgG and FITC-labeled goat–anti-human IgG were adopted to investigate the adsorption enhancement when analyte flowed through diatom frustules. The results indicated up to 16-fold enhancement of fluorescent signal sensitivity for the flow-through mode compared with flow-over mode, at a low concentration of 10.0 μg/mL. Moreover, the maximum flow rate reached 2.0 μL/s, which resulted in a significant decrease in the testing time in POCT. The adsorption simulation results of diatom array embedded in the microchannel shows good agreement with experimental results, which further proves the filtration enrichment effect of the diatom array. The methods put forward in this study may open a new window for the application of diatom frustules in biosensing platforms. MDPI 2021-08-26 /pmc/articles/PMC8469004/ /pubmed/34577659 http://dx.doi.org/10.3390/mi12091017 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Zhenhu
Gong, De
Cai, Jun
Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip
title Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip
title_full Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip
title_fullStr Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip
title_full_unstemmed Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip
title_short Diatom Frustule Array for Flow-Through Enhancement of Fluorescent Signal in a Microfluidic Chip
title_sort diatom frustule array for flow-through enhancement of fluorescent signal in a microfluidic chip
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8469004/
https://www.ncbi.nlm.nih.gov/pubmed/34577659
http://dx.doi.org/10.3390/mi12091017
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