期刊
BIOSENSORS & BIOELECTRONICS
卷 49, 期 -, 页码 32-38出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.04.028
关键词
Measles-antigen; Measles-specific antibodies; Impedance; Immunosensors
类别
资金
- Mintek through the Department of Science and Technology (DST)/Mintek Nanotechnology Innovation Center (NIC)
- National Research Foundation (NRF) through DST/NRF South Africa Research Chairs Initiative
- Rhodes University
The detection of measles-specific primary antibodies (IgG) using electrochemical impedimetric immunosensors is reported. The optimum conditions for electrode saturation were reached after 40 min for 1 mu g ml(-1) antibody concentrations. Surface roughness using AFM increased with each immobilization or antigen-antibody reaction step clearly confirming the surface modification and recognition between antigen and antibody. The human serum (HS) and new-born calf serum (NCS) spiked with antigenspecific antibody were studied to mimic the real sample analysis. The HS and NCS sera containing antibodies due to measles exhibited correlation between the increasing antibody serum concentrations and the charge-transfer resistance (electrochemically measured). This work clearly showed the potential use of impedance as the preferred electrochemical method for detecting measles-antibodies in label-free manner. (C) 2013 Elsevier B.V. All rights reserved.
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