Beyond the Debye length in high ionic strength solution: direct protein detection with field-effect transistors (FETs) in human serum.
Beyond the Debye length in high ionic strength solution: direct protein detection with field-effect transistors (FETs) in human serum.
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DOI:
10.1038/s41598-017-05426-6
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发表时间:
2017-07-12
影响因子:
4.6
通讯作者:
Wang YL
中科院分区:
文献类型:
--
作者:
Chu CH;Sarangadharan I;Regmi A;Chen YW;Hsu CP;Chang WH;Lee GY;Chyi JI;Chen CC;Shiesh SC;Lee GB;Wang YL
In this study, a new type of field-effect transistor (FET)-based biosensor is demonstrated to be able to overcome the problem of severe charge-screening effect caused by high ionic strength in solution and detect proteins in physiological environment. Antibody or aptamer-immobilized AlGaN/GaN high electron mobility transistors (HEMTs) are used to directly detect proteins, including HIV-1 RT, CEA, NT-proBNP and CRP, in 1X PBS (with 1%BSA) or human sera. The samples do not need any dilution or washing process to reduce the ionic strength. The sensor shows high sensitivity and the detection takes only 5 minutes. The designs of the sensor, the methodology of the measurement, and the working mechanism of the sensor are discussed and investigated. A theoretical model is proposed based on the finding of the experiments. This sensor is promising for point-of-care, home healthcare, and mobile diagnostic device.
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