期刊
BIOSENSORS & BIOELECTRONICS
卷 123, 期 -, 页码 30-35出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.09.085
关键词
Aptamer; Field effect transistor; Plasmodium falciparum; Glutamate dehydrogenase; Malaria; Extended gate; Biosensor
类别
资金
- British Council Newton-Bhabha Fund [BT/IN/UK/DBT-BC/16-17]
- Department of Biotechnology, Government of India [BT/PR13560/COE/34/44/2015]
There has been a continuous strive to develop portable, stable, sensitive and low cost detection system for malaria to meet the demand of effective screening actions in developing countries where the disease is most endemic. Herein, we report an aptamer-based field effect transistor (aptaFET) biosensor, developed by using an extended gate field effect transistor with inter-digitated gold microelectrodes (ID mu E) for the detection of the malaria biomarker Plasmodiwn falciparum glutamate dehydrogenase (PfGDH) in serum samples. A 90 mer long ssDNA aptamer (NG3) selective to PfGDH was used in the aptaFET to capture the target protein. The intrinsic surface net charge of the captured protein led to change in gate potential of the aptaFET device, which could be correlated to the concentration of the protein. This biosensor exhibited a sensitive response in broad dynamic range of 100 fM - 10 nM with limits of detection of 16.7 pM and 48.6 pM in spiked buffer and serum samples, respectively. The high selectivity of the biosensor for PfGDH was verified by testing relevant analogous human and parasitic proteins on the device. Overall, the results validated the application potential of the developed aptaFET for diagnosis of both symptomatic and asymptomatic malaria.
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