A piezoelectric sensor with a molecularly imprinted synthetic polymer receptor was developed. A plant hormone, indole-3-acetic acid (IAA) was used as the model target molecule, and an IAA-imprinted polymer was coated onto a 9 MHz AT-cut quartz crystal microbalance. The sensor showed a selective response and gave a linear relationship between frequency shift and amount of IAA in the range from 10 to 200 nmol.
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Kugimiya et al. (1999) studied this question.
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