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Performance of the HV-Chip for the detection of OTA [98]. (A) Working principle of the target-responsive hydrogel combined with the volumetric bar-chart chip readout for visual quantitative detection. (B) Images showing ink advancement for the detection of OTA in the range of 0 to 1000 nM in 30 min. (C) Linear standard curve was obtained from 0 to 1000 nM OTA. (Reprinted from reference [98], Copyright (2015), with permission from American Chemical Society).
