Abstract
We report on a modified solid-state nanopore measurement scheme to probe hydrophobic molecules that cannot be studied in conventional systems. Taking advantage of the intrinsic alcohol solubility of LiCl as an electrolyte, we show that the devices can be operated in alcohol-based azeotropic mixtures. We first characterize nanopore conductivity as a function of ethanol content, nanopore diameter, and salt concentration, showing predictable ionic response. Then, as a demonstration of resistive-pulse sensing, we measure and interpret electrical translocations of zeins, a class of water-insoluble maize protein.
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