Abstract
We successfully determined a suitable glucose concentration for endothelial cells (ECs) using a gradient-generating microfluidic chip and a micro-stamper that were fabricated using micro-electro-mechanical systems (MEMS) technology. Our strategy was to generate a stable concentration gradient in the observation area based on a microfluidic network and micro-mixers, which produced a concentration gradient under various flow rates. The areas for cell adhesion were delineated on a glass slide with a micro-stamper using the micro-contact printing (μCP) method. We also discuss which glucose concentration gradients are suitable for cell viability test (i.e., 0–0.2%, 0.05–0.15%, and 0.06–0.17%). After examining various concentration gradients, the suitable glucose concentration for EC’s viability test was determined to range from 0.077% (4.2 mM) to 0.147% (8.16 mM). Higher or lower concentrations caused the ECs to atrophy or die. In this study, we describe a gradient-generating microfluidic chip that can be used to produce various drug concentrations for multi-concentration tests.
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Acknowledgments
The authors would like to thank the Center for Micro/Nano Technology, National Cheng Kung University, Tainan, Taiwan, R.O.C., for access to equipment and technical support. Funding from the Ministry of Education and the National Science Council of Taiwan, R.O.C. under Grants NSC 97-2221-E-006-222-MY3 and NSC 99-2221-E-006-203-MY3 are gratefully acknowledged.
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Yeh, CH., Chen, CH. & Lin, YC. Use of a gradient-generating microfluidic device to rapidly determine a suitable glucose concentration for cell viability test. Microfluid Nanofluid 10, 1011–1018 (2011). https://doi.org/10.1007/s10404-010-0730-0
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DOI: https://doi.org/10.1007/s10404-010-0730-0