Application of carbon nanotubes layered on silicon wafer for the detection of breast cancer marker carbohydrate antigen 15-3 by immuno-polymerase chain reaction

S. Sadhasivam, Jung-Chih Chen, S. Savitha, Chun Wei Chang, Feng Huei Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A highly sensitive detection of breast cancer marker, carbohydrate antigen 15-3 (CA 15-3) by carbon nanotube (CNT) based immuno-polymerase chain reaction was reported. The study was aimed to develop a precise and sensitive method to diagnose breast cancer and its recurrence. The hydrofluoric acid (HF) treated silicon wafer layered with bundled CNT was used as the substrate. The surface was treated with HNO3/H2SO4 to graft carboxyl groups on the tips of CNT. Subsequently, polyoxyethylene bis-amine was grafted to conjugate anti human CA 15-3 antibodies. Water contact angle measurement, scanning electron microscope, Fourier transform infrared spectrometer, Raman spectrometer and sodium dodecyl sulfate polyacrylamide gel electrophoresis were employed to confirm the surface modification. The captured antibodies on the CNT were used to capture the target antigen CA 15-3 and the biotinylated secondary antibodies were subsequently bound with the target antigen. A bi-functional streptavidin was used to link biotinylated DNA to the biotinylated detection antibodies. The biotinylated target DNA was amplified by PCR, and then analyzed by agarose gel electrophoresis. The lower limit of detection of CA 15-3 by the proposed immuno-PCR system was 0.001 U/mL, which is extremely sensitive than the other bioanalytical techniques.

Original languageEnglish
Pages (from-to)101-111
Number of pages11
JournalJournal of Materials Science: Materials in Medicine
Volume25
Issue number1
DOIs
StatePublished - 1 Jan 2014

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