TY - JOUR
T1 - Electrochemical aptasensor using optimized surface chemistry for the detection of Mycobacterium tuberculosis secreted protein MPT64 in human serum
AU - Sypabekova, Marzhan
AU - Jolly, Pawan
AU - Estrela, Pedro
AU - Kanayeva, Damira
N1 - Funding Information:
P.J. was funded by the European Commission FP7 Programme through the Marie Curie Initial Training Network PROSENSE (grant no. 317420, 2012–2016 ).
Funding Information:
We would like to acknowledge Sunil K. Arya, Pavel Zhurauski, and other members of the Biosensor Research Laboratory at the University of Bath for their help, advice and guidance. This work was supported by the British Council through a Newton-Al Farabi Fund researcher links travel grant (grant reference: 216423762 ).
Funding Information:
P.J. was funded by the European Commission FP7 Programme through the Marie Curie Initial Training Network PROSENSE (grant no. 317420, 2012?2016).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Tuberculosis (TB) remains one of the leading causes of mortality worldwide. There is a great need for the development of diagnostic tests, which are reliable, sensitive, stable, and low cost to enable early diagnosis of TB in communities with scarce resources. This study reports the optimization and evaluation of a synthetic receptor, an aptamer, for the detection of the secreted protein MPT64, which is a highly immunogenic polypeptide of Mycobacterium tuberculosis, a causative agent of TB. The study investigates combinatorial effects of an aptamer linker and a co-adsorbent onto a gold electrode for optimal binding efficiency and reduced non-specific interactions for label-free detection of MPT64 using electrochemical impedance spectroscopy. Two types of co-adsorbents and two types of aptamer linkers were studied and high specificity and sensitivity to MPT64 was observed for a surface prepared with a thiol PEGylated aptamer HS-(CH2)6-OP(O)2O-(CH2CH2O)6-TTTTT-aptamer and 6-mercaptohexanol in a ratio of 1:100. The developed aptamer-based sensor was successfully used with spiked human serum sample with a limit of detection of 81 pM This work demonstrates the use of the MPT64 aptamer as a lower cost, more sustainable and stable alternative of antibodies for the development of point-of-care TB biosensors decreasing the detection time from several days or hours to thirty minutes.
AB - Tuberculosis (TB) remains one of the leading causes of mortality worldwide. There is a great need for the development of diagnostic tests, which are reliable, sensitive, stable, and low cost to enable early diagnosis of TB in communities with scarce resources. This study reports the optimization and evaluation of a synthetic receptor, an aptamer, for the detection of the secreted protein MPT64, which is a highly immunogenic polypeptide of Mycobacterium tuberculosis, a causative agent of TB. The study investigates combinatorial effects of an aptamer linker and a co-adsorbent onto a gold electrode for optimal binding efficiency and reduced non-specific interactions for label-free detection of MPT64 using electrochemical impedance spectroscopy. Two types of co-adsorbents and two types of aptamer linkers were studied and high specificity and sensitivity to MPT64 was observed for a surface prepared with a thiol PEGylated aptamer HS-(CH2)6-OP(O)2O-(CH2CH2O)6-TTTTT-aptamer and 6-mercaptohexanol in a ratio of 1:100. The developed aptamer-based sensor was successfully used with spiked human serum sample with a limit of detection of 81 pM This work demonstrates the use of the MPT64 aptamer as a lower cost, more sustainable and stable alternative of antibodies for the development of point-of-care TB biosensors decreasing the detection time from several days or hours to thirty minutes.
KW - Antigen MPT64
KW - Aptamer
KW - Detection
KW - Electrochemistry
KW - Mycobacterium tuberculosis
KW - Surface chemistry
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U2 - 10.1016/j.bios.2018.07.053
DO - 10.1016/j.bios.2018.07.053
M3 - Article
AN - SCOPUS:85050885299
VL - 123
SP - 141
EP - 151
JO - Biosensors and Bioelectronics
JF - Biosensors and Bioelectronics
SN - 0956-5663
ER -