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2014 ; 8
(5
): 056503
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Fabrication of rigid microstructures with thiol-ene-based soft lithography for
continuous-flow cell lysis
#MMPMID25538814
Burke JM
; Pandit KR
; Goertz JP
; White IM
Biomicrofluidics
2014[Sep]; 8
(5
): 056503
PMID25538814
show ga
In this work, we introduce a method for the soft-lithography-based fabrication of
rigid microstructures and a new, simple bonding technique for use as a
continuous-flow cell lysis device. While on-chip cell lysis techniques have been
reported previously, these techniques generally require a long on-chip residence
time, and thus cannot be performed in a rapid, continuous-flow manner.
Microstructured microfluidic devices can perform mechanical lysis of cells,
enabling continuous-flow lysis; however, rigid silicon-based devices require
complex and expensive fabrication of each device, while polydimethylsiloxane
(PMDS), the most common material used for soft lithography fabrication, is not
rigid and expands under the pressures required, resulting in poor lysis
performance. Here, we demonstrate the fabrication of microfluidic microstructures
from off-stoichiometry thiol-ene (OSTE) polymer using soft-lithography replica
molding combined with a post-assembly cure for easy bonding. With finite element
simulations, we show that the rigid microstructures generate an energy
dissipation rate of nearly 10(7), which is sufficient for continuous-flow cell
lysis. Correspondingly, with the OSTE device we achieve lysis of highly
deformable MDA-MB-231 breast cancer cells at a rate of 85%, while a comparable
PDMS device leads to a lysis rate of only 40%.