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. 2013 Jul 23;8(7):e69049. doi: 10.1371/journal.pone.0069049

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© 2013 Sui et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Detection of various concentrations of AChE in solution using the QCM system. The frequency shift increased as the concentration of AChE increased. (B) Frequency shifts of the QCM immunosensor as a function of the concentration of AChE in PBS. The concentration of the AChE antibody was 100 µg/ml. A linear correlation between the frequency change and the concentration of AChE was observed between 0.5 to 10 µg/ml.