Detection of hexanal as a volatile organic compound biomarker of cancers using a nanocomposite of gold nanoparticles and selective polymers
Marziyeh Mousazadeh, Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University
Abstract:
A new chemiresistive sensor for detection of hexanal, as a volatile organic compound, was constructed based on a nanocomposite of gold nanoparticles and molecularly imprinted polymers. Changes in volatile organic compounds levels are associated to a variety of health problems like cancers. The nanocomposite was drop casted on the surface of an interdigitated electrode and the electrical response and resistance change of the sensor were analyzed by fast Fourier transform cyclic voltammetry in the presence of different concentrations of gaseous hexanal. The ability of the sensor to detect hexanal in the headspace of different biological matrixes like cell culture medium, serum, plasma, urine, and saliva was also examined. The calculated limit of detection and linear range of the sensor were determined as 1.1 ppm and 2.5-300 ppm respectively. The sensor showed three times more sensitivity to hexanal than other volatile organic compounds with similar carbon atom number in the selectivity test.
Comments
Nice job! Have you examined other VOCs for lung cancers, since it is important to use array of VOCs for accurate detection?
Thanks. Yes, another VOC called nonanal was also examined in a similar detecting system.
Why didn't you use conductive carbon-based nanoparticles for modifying your electrode?
Thanks. Since carbon-based nanoparticles have surface adsorption for gaseous molecules, it was preferred to use other conductive nanoparticles like gold nanoparticles in this sensor.
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