Abstract |
This study is an investigation for an inexpensive, simple and sensitive biosensor to detect prostate cancer using bioactivated-multi wall carbon nanotubes (MWCNTs, diameter of 20nm, length of 5µm) and a micro-pore filter paper (pore size of 0.45µm). For the immunoassay of prostate specific antigen (PSA), which is a biomarker of prostate cancer, MWCNTs were activated with PSA antibody (monoclonal antibody of the prostate specific antigen) by using N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysulfosuccinimide sodium salt (NHSS). The activated MWCNTs were deposited on the micro-pore filter paper to use as a biosensor. The prepared biosensor can assay from 0 to 500ng/mL of PSA level within 2h with the detection limit of 1.18ng/mL by the measurement of resistance change. The resistance change was caused by site selective interaction between PSA and PSA- antigen with an inexpensive bench top digital multimeter (5 1/2 digits). The detection range and sensitivity of the prepared sensor are good enough to diagnose the early stage of prostate cancer (> 4ng/mL of PSA). This paper-based biosensor is about 20 times cheaper (fabricated biosensor price: 2.4 $) and over 10 times faster than enzyme-linked immunosorbent assay (ELISA), which is a general method for the detection of a specific protein in the modernized hospitals. Furthermore, the maximum detection limit is about 50 times higher than ELISA.
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Authors | Sungkyung Ji, Myeongsoon Lee, Don Kim |
Journal | Biosensors & bioelectronics
(Biosens Bioelectron)
Vol. 102
Pg. 345-350
(Apr 15 2018)
ISSN: 1873-4235 [Electronic] England |
PMID | 29172142
(Publication Type: Journal Article)
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Copyright | Copyright © 2017 Elsevier B.V. All rights reserved. |
Chemical References |
- Biomarkers, Tumor
- Nanotubes, Carbon
- Gold
- Prostate-Specific Antigen
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Topics |
- Biomarkers, Tumor
(blood, isolation & purification)
- Biosensing Techniques
- Early Detection of Cancer
- Enzyme-Linked Immunosorbent Assay
- Gold
(chemistry)
- Humans
- Male
- Metal Nanoparticles
(chemistry)
- Nanotubes, Carbon
(chemistry)
- Prostate-Specific Antigen
(blood)
- Prostatic Neoplasms
(blood)
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