Rapid mixing of sub-microlitre drops by magnetic micro-stirring.

Rapid mixing of sub-microlitre drops by magnetic micro-stirring.
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DOI:
10.1039/c1lc20354a
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发表时间:
2011-10-07
期刊:
影响因子:
6.1
通讯作者:
Bruce RH
Bruce RH
中科院分区:
工程技术1区
文献类型:
--
作者:
De Bruyker D;Recht MI;Bhagat AA;Torres FE;Bell AG;Bruce RH

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We demonstrate rapid mixing of sub-microliter droplets (250nl) using miniaturized magnetic stir bars (400 μm by 200 μm by 15 μm). The stir bars are fabricated using laser micromachining and placed on the substrate on which the drops are manipulated. They are activated by an externally applied magnetic field and used in combination with on-demand drop merging in enthalpy arrays. This technique results in a 10-fold increase in mixing rate, and a mixing time constant of about 2 seconds. Drop mixing times are measured by Förster resonance energy transfer (FRET) and verified by thermodynamic measurements of binding and enzymatic reactions.
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