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Generating spatially and temporally controllable long-range concentration gradients in a microfluidic device
Generating spatially and temporally controllable long-range concentration gradients in a microfluidic device,10.1109/NEBC.2009.4967806,M. Vidula,Y. Du
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Generating spatially and temporally controllable long-range concentration gradients in a microfluidic device
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M. Vidula
,
Y. Du
,
J. Shim
,
E. Lo
,
A. Khademhosseini
Concentration gradients have important applications in chemical and biological studies. Here we have achieved rapid generation of spatially and temporally controllable concentration gradients of diffusible molecules (i.e. proteins or toxins) in a portable microfluidic device. The formation of the concentration gradients was initiated by a passive-pump-induced forward flow and further optimized during an evaporation-induced backward flow. We were able to stabilize the gradient for up to 12 hours by stopping the flow. The computational simulations illustrated the combined effects of convection and diffusion on the gradient generation, and fit well with the experimental data. HL-1 cardiac cells were cultured in the device, and were shown to be responsive to the stabilized concentration gradient of a cardiac toxin, alpha-cypermethrin. The approach presented here may be useful for many
biological and chemical
processes that require rapid generation of long-range gradients in a portable microfluidic device.
Conference:
IEEE Annual Northeast Bioengineering Conference - NEBEC
, 2009
DOI:
10.1109/NEBC.2009.4967806
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