Aptamer-field-effect transistors overcome Debye length limitations for small-molecule sensing.
Aptamer-field-effect transistors overcome Debye length limitations for small-molecule sensing.
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DOI:
10.1126/science.aao6750
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发表时间:
2018-10-19
期刊:
影响因子:
--
通讯作者:
Andrews AM
中科院分区:
文献类型:
--
作者:
Nakatsuka N;Yang KA;Abendroth JM;Cheung KM;Xu X;Yang H;Zhao C;Zhu B;Rim YS;Yang Y;Weiss PS;Stojanović MN;Andrews AM
Detection of analytes with field-effect transistors bearing ligand-specific receptors is fundamentally limited by the shielding created by the electrical double layer (the “Debye length” limitation). We detected small molecules under physiological high ionic-strength conditions by modifying printed ultrathin metal-oxide field-effect transistor arrays with deoxyribonucleotide aptamers selected to bind their targets adaptively. Target-induced conformational changes of negatively charged aptamer phosphodiester backbones in close proximity to semiconductor channels gated conductance in physiological buffers, resulting in highly sensitive detection. Sensing of charged and electroneutral targets (serotonin, dopamine, glucose, and sphinghosine-1-phosphate) was enabled by specifically isolated aptameric stem-loop receptors. Field-effect transistors bearing aptameric stem-loop receptors designed to be conformationally flexible close to semiconductor surfaces detect small-molecule targets under physiological conditions overcoming Debye length limitations.
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DOI:
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发表时间:
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期刊:
The Biochemical journal
影响因子:
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