In

fact, we are more interested in the average translocation time for event A. So, we distinguish event A from B, and then give the happening probability and the average duration time of event A. As shown in Figure 6a, for the 20-nm diameter nanopore, the probability of straight translocation events falls sharply in an electrolyte rich in Mg2+ ions. This A-1210477 solubility dmso phenomenon is consistent with our analysis, but it is disadvantage for DNA detection and analysis. However, aperture reduction can raise the probability of DNA molecule straight translocation event from 11.7% to 34.3%, which may ease this problem. From Figure 6b, we can see for the 20-nm diameter nanopore that https://www.selleckchem.com/products/XAV-939.html event A averaged duration time also rises with the increase of Mg2+ ion concentration, as we expected. It is 1.31 ms for 1 M MgCl2 solution, about three times longer than that for the same DNA in 1 M KCl solution. We also found that the translocation time for the 7-nm diameter nanopore is 1.32 ms, almost the same as that for the 20-nm diameter nanopore. So, we can

conclude that the translocation time of event A does not depend so much on the diameter of a nanopore. Figure 6 Straight state translocation events. (a) Probabilities in different experiment conditions. (b) Average residence times in different experiment conditions. Conclusion In summary, the duration time for DNA translocation through a nanopore can be extended with the use of MgCl2 electrolyte. The side effect is that Mg2+ ions may induce more DNA strands binding together, which is harmful to do DNA sequencing in MgCl2 electrolyte. Reducing the nanopore diameter can effectively reduce the occurrence number of the folded DNA translocation Repotrectinib cost events. So, we can say that theMgCl2 solution is a good choice for nanopore DNA sequencing experiments if nanopore diameter can be reduced further. Authors’ information YZ is tuclazepam a PhD candidate of Mechanical Design and Theory at the School

of Mechanical Engineering, Southeast University, Nanjing, P.R. China. He is interested in nanopore fabrication and nanopore biosensing. LL is an assistant professor of Mechanical Design and Theory at the School of Mechanical Engineering, Southeast University, Nanjing, P.R. China. His research interests are biomolecule sensing and biodegradable materials design. JS is an assistant professor of Mechanical Design and Theory at the School of Mechanical Engineering, Southeast University, Nanjing, P.R. China. Her research interest is micro-nano fluidic device design. ZN is a professor of Mechanical Manufacture and Automation at the School of Mechanical Engineering, Southeast University, Nanjing, P.R. China. His research interests are minimally invasive medical devices and microfluidic diagnostic device design and manufacture. HY is a professor of Mechanical Manufacture and Automation at the School of Mechanical Engineering, Southeast University, Nanjing, P.R. China. His research interest is advanced manufacturing technology.