A Rational Approach to Minimal High-Resolution Cross-Reactive Arrays
Citations Over TimeTop 13% of 2006 papers
Abstract
We report a rational approach to the construction of cross-reactive arrays for steroids consisting of five to seven sensors incorporating modified oligonucleotides. The sensors for our arrays were selected to maximize their differential responses to the two steroids most different in an arbitrarily chosen parameter named "shape-length". The arrays incorporated three previously unreported types of sensors identified through a massive screening effort: (1) three-way junction sensors with neutralized charges within junction; (2) "self-aggregating sensors"; and (3) sensors incorporating fluorophore directly in a three-way junction as a spacer. The arrays were tested on seven steroids and an alkaloid (cocaine) over a range of concentrations, and achieved 92-96% accuracy in class assignments, despite the close structural similarities between steroids.
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