pH and Calcium Cooperative Regulation Nanofluidic Gating Device

doi:10.6023/A16010053

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (6): 538-544.DOI: 10.6023/A16010053 Previous Articles

Article

pH和钙离子协同控制的纳米流体门控器件

许阳蕾, 孟哲一, 翟锦

北京航空航天大学化学与环境学院仿生智能科学与技术教育部重点实验室北京 100191

投稿日期:2016-01-25 发布日期:2016-05-13
通讯作者: 翟锦 E-mail:zhaijin@buaa.edu.cn
基金资助:
项目受国家重点基础研究发展规划项目(973 项目) (No. 2012CB720904), 国家自然科学基金(No. 21271016)及“北京航空航天大学基本科研业务费-博士研究生创新基金”资助.

pH and Calcium Cooperative Regulation Nanofluidic Gating Device

Xu Yanglei, Meng Zheyi, Zhai Jin

Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191

Received:2016-01-25 Published:2016-05-13
Supported by:
Project supported by the National Basic Research Program of China (No. 2012CB720904), the National Natural Science Foundation of China (No. 21271016) and the Innovation Foundation of BUAA for PhD Graduates.

1. pH and Calcium Cooperative Regulation Nanofluidic Gating Device.PDF(283KB)

Abstract

In living body, Ca²⁺-responsive ion channels play crucial roles in many biological activities. Inspired by nature, the design and fabrication of artificial smart nanochannels system become a very significant research subject, mimicking the biological Ca²⁺-responsive signals in ion channels. In this article, by using track-etched artificial polyethylene terephthalate (PET) multiporous membrane materials and modifying intelligent molecules O-Phospho-L-tyrosine (OPLT) through chemical modification method, we demonstrate a new biomimetic artificial smart responsive ion channel system, which presents the cooperative response to pH and calcium. The nanosystem shows ion selective transport, ion gating and ion rectification property, which is similar to the property of biological Ca²⁺-responsive ion channels. And the cooperative responsive property of pH and calcium in OPLT modified nanochannels was also investigated by measuring the current-voltage (I-V) curves. At a low pH value, the surface charge of the nanochannels walls is positive as a result of the amino group (NH₃⁺) of OPLT, the nanosystem attracts the anions and inhibits the cations due to electrostatic interactions between the anions passing through the nanochannels and the nanochannels cations walls, resulting in ion current rectification property. Meanwhile, after adding calcium to the nanosystem, no significant changes of ion current are found. The system presents no calcium responsive property. At a high pH value, the surface charge of the nanochannels walls is negative due to the phosphate group (HPO₄^2-) of OPLT, the nanosystem shows cations-selective. After adding calcium to the solution, the bonding of phosphate group (HPO₄^2-) with calcium (Ca²⁺) results in the neutralization of the surface charge in the nanochannels. This nanochannels switch the polarity of ion transport from cation-selective to non-selective, and turn from the highly conductive state to the low conductive state. The significant decline of the ion current can be observed. Thus, the OPLT modified nanofluidic gating device displays the cooperative effect of pH and calcium. This system provides a new idea for the multiple signal induced ion gating in conical nanochannel devices.

Key words: calcium gating, ion channels, rectification, pH response, nanofluidic

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Xu Yanglei, Meng Zheyi, Zhai Jin. pH and Calcium Cooperative Regulation Nanofluidic Gating Device[J]. Acta Chim. Sinica, 2016, 74(6): 538-544.

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pH和钙离子协同控制的纳米流体门控器件

pH and Calcium Cooperative Regulation Nanofluidic Gating Device

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