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Chin. Phys. B, 2023, Vol. 32(11): 118704    DOI: 10.1088/1674-1056/acfaf6
Special Issue: SPECIAL TOPIC — Celebrating the 100th Anniversary of Physics Discipline of Northwest University
SPECIAL TOPIC—Celebrating the 100th Anniversary of Physics Discipline of Northwest University Prev   Next  

Effect of mono-/divalent metal ions on the conductivity characteristics of DNA solutions transferring through a microfluidic channel

Jie Zhu(朱洁), Jing Xue(薛菁), Wei Zhao(赵伟), Chen Zhang(张琛), Xiaoqiang Feng(冯晓强), and Kaige Wang(王凯歌)
State Key Laboratory of Cultivation Base for Photoelectric Technology and Functional Materials, Key Laboratory of Optoelectronic Technology of Shaanxi Province, National Center for International Research of Photoelectric Technology & Nano-functional Materials and Application, Institute of Photonics and Photon-Technology, Northwest University, Xi'an 710069, China
Abstract  Interactions between deoxyribonucleic acid (DNA) and metal ions are vital for maintaining life functions, however, there are still unsolved questions about its mechanisms. It is of great practical significance to study these issues for medical chip design, drug development, health care, etc. In this investigation, the conductivity properties of λ -DNA solutions with mono-/divalent metal ions (Na+, K+, Mg2+, and Ca2+) are experimentally studied as they are electrically driven through a 5 μ m microfluidic channel. Experimental data indicate that the conductivities of λ -DNA solutions with metal ions (M+/M2+) basically tend to reduce firstly and then increase as the voltage increases, of which the turning points varied with the metal ions. When the voltage surpasses turning points, the conductivity of λ -DNA-M+ solutions increases with the concentration of metal ions, while that of λ -DNA-M2+ solutions decrease. Moreover, the conductivity of λ -DNA-M2+ solutions is always smaller than that of λ -DNA-M+ solutions, and with high-concentration M2+, it is even smaller than that of the λ -DNA solution. The main reasons for the above findings could be attributed to the polarization of electrodes and different mechanisms of interactions between metal ions and λ -DNA molecules. This investigation is helpful for the precise manipulation of single DNA molecules in micro-/nanofluidic space and the design of new biomedical micro-/nanofluidic sensors.
Keywords:  microfluidics      interaction between deoxyribonucleic acid (DNA) and metal ions      conductivity-voltage relations      asymmetric electrodes  
Received:  30 June 2023      Revised:  28 August 2023      Accepted manuscript online:  19 September 2023
PACS:  87.14.gk (DNA)  
  87.19.rh (Fluid transport and rheology)  
  47.27.nd (Channel flow)  
  87.15.H- (Dynamics of biomolecules)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62275216 and 61775181), the Innovation Capability Support Program of Shaanxi Province of China (Grant Nos. S2018-ZC-TD-0061 and TZ0393), and the National Key Scientific Instrument and Equipment Development Projects of China (Grant No. 51927804).
Corresponding Authors:  Kaige Wang     E-mail:  wangkg@nwu.edu.cn

Cite this article: 

Jie Zhu(朱洁), Jing Xue(薛菁), Wei Zhao(赵伟), Chen Zhang(张琛), Xiaoqiang Feng(冯晓强), and Kaige Wang(王凯歌) Effect of mono-/divalent metal ions on the conductivity characteristics of DNA solutions transferring through a microfluidic channel 2023 Chin. Phys. B 32 118704

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