Microfluidic sensing devices employing in situ-formed liquid crystal thin film for detection of biochemical interactions.

Microfluidic sensing devices employing in situ-formed liquid crystal thin film for detection of biochemical interactions.
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DOI:
10.1039/c2lc40462a
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发表时间:
2012-10-07
期刊:
影响因子:
6.1
通讯作者:
Jiang H
Jiang H
中科院分区:
工程技术1区
文献类型:
--
作者:
Liu Y;Cheng D;Lin IH;Abbott NL;Jiang H

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尽管已经证明了使用液晶(LC)的生物化学感测,但是相对较少的注意力被用于原位形成的LC感测装置的制造。在此,我们展示了一种高度可重复的方法,以根据需要在经处理的基板上产生均匀的LC薄膜,用于LC传感。我们使用微流体通道内的含水液体的层流产生的剪切力来创建在微加工结构内稳定的LC薄膜。液晶薄膜对水相中目标分析物的取向响应被液晶薄膜的光学双折射转换和放大。我们的传感装置的生化传感能力,通过实验证明了采用两种化学系统:十二烷基三甲基溴化铵(DTAB)溶解在水溶液中,和磷脂酶A2(PLA2)的磷脂水解。
Although biochemical sensing using liquid crystals (LC) has been demonstrated, relatively little attention has been paid towards the fabrication of in situ-formed LC sensing devices. Herein, we demonstrate a highly reproducible method to create uniform LC thin film on treated substrates, as needed, for LC sensing. We use shear forces generated by the laminar flow of aqueous liquid within a microfluidic channel to create LC thin films stabilized within microfabricated structures. The orientational response of the LC thin films to targeted analytes in aqueous phases was transduced and amplified by the optical birefringence of the LC thin films. The biochemical sensing capability of our sensing devices was demonstrated through experiments employing two chemical systems: dodecyl trimethylammonium bromide (DTAB) dissolved in an aqueous solution, and the hydrolysis of phospholipids by the enzyme phospholipase A2 (PLA2).
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