BioChip Journal

The Korean BioChip Society (한국바이오칩학회)
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Effects of Ionic Strength in the Medium on Sample Preconcentration Utilizing Nano-interstices between Self-Assembled Monolayers of Gold Nanoparticles

  • Nguyen, Ngoc-Viet (Department of Mechanical Engineering, National Chung Cheng University) ;
  • Wu, Jian-Sheng (Department of Mechanical Engineering, National Chung Cheng University) ;
  • Jen, Chun-Ping (Department of Mechanical Engineering, National Chung Cheng University)
  • Received : 2018.05.31
  • Accepted : 2018.07.10
  • Published : 2018.12.20
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Abstract

This paper investigated the effects of ionic strength in the medium on a preconcentrator for a protein sample with low concentration. The preconcentration chip was designed and fabricated using a polydimethylsiloxane replica through standard lithophotography. A glass substrate is silanized prior to functionalizing the nanoparticles for self-assembly at a designed region. Due to the overlap of electrical double layers in a nanofluidic channel, a concentration polarization effect can be achieved using an electric field. A nonlinear electrokinetic flow is induced, resulting in the fast accumulation of proteins in front of the induced ionic depletion zone, so called exclusion-enrichment effect. Thus, the protein sample can be driven by electroosmotic flow and accumulated at a specific location. The chip is used to collect fluorescein isothiocyanate-labeled bovine serum albumin (FITC-BSA) diluted in phosphate-buffered saline (PBS) buffer solution. Different concentrations of the buffer media were studied herein. Fluorescence intensity images show that the buffer concentration of 4 mM is more appropriate than all the other ones. The sample of FITC-BSA with an initial concentration of $10{\mu}M$ in the 4 mM PBS solution increases its concentration at the desired region by up to 50 times within 30 min, demonstrating the results in this investigation.

Keywords

Acknowledgement

Supported by : Ministry of Science and Technology of Republic of China

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