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The concentration and composition of volatile organic compounds (VOCs) that we exhale into the air change when we are affected by certain pathologies. They can be used as biomarkers and their detection could therefore allow for diagnosis of diseases at an early stage. To do this, scientists at our laboratory have designed an electronic nose (e-nose) based on peptide hybrid nanostructures, which have shown excellent sensitivity. These results are published in the journal ACS Nano.
Inspired by the human nose, e-noses are promising tools for the detection and analysis of volatile organic compounds (VOCs), often considered as responsible for olfactory pollution, and more recently discovered to be potential biomarkers of certain diseases such as cancer. Currently, systems based on polymers or inorganic materials are effective in terms of sensitivity, but often suffer from a low selectivity.
To improve their performance, scientists are particularly interested in the design of more stable biological materials such as peptide. Why this choice? First of all, because peptides are analogues of the proteins that participate in the recognition of odors in the human nose, but with a greater stability. Moreover, with the 21 amino acids, it is possible to design a great diversity of peptides with selective interactions for VOCs and thus offer e-noses better performance in terms of VOC recognition and discrimination.
In this context, a team at IRIG * has just designed original hybrid nanostructures by self-assembly of a surfactant-like peptide (Cys-Gly-Gly-Gly-Gly-Gly-Gly-Gly). Thanks to a simple spotting process using a spotter robot, they then succeeded in depositing them on a chip. In such a way, they obtained peptide hybrid nanostructures with controlled morphology and varied physico-chemical properties, which play a decisive role in the selectivity of VOC detection by the obtained e-nose.
The performances of such an e-nose are excellent with detection limits less than 1 part per billion by volume (ppbv) for hexanoic acid and 6 ppbv for phenol, two biomarkers of oesogastric cancers. This work was recently published in the journal
Exploration into the nanoscopic world of biohybrid surfaces designed for the detection and discrimination of volatile organic compounds.
© Jonathan S. Weerakkody
Thesis presented March 26, 2021 by Jonathan Shilantha Weerakkody.
Thesis presented November 17, 2020 by Charlotte Hurot. PhD thesis available as a pdf file.
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.