Mass and stiffness spectrometry of nanoparticles and whole intact bacteria by multimode nanomechanical resonators.
The identification of species is a fundamental problem in analytical chemistry and biology. Mass spectrometers identify species by their molecular mass with extremely high sensitivity (<10-24g). However, its application is usually limited to light analytes (<10-19g). Here we demonstrate that by using nanomechanical resonators, heavier analytes can be identified by their mass and stiffness. The method is demonstrated with spherical gold nanoparticles and whole intact E. coli bacteria delivered by electrospray ionization to microcantilever resonators placed in low vacuum at 0.1 torr. We develop a theoretical procedure for obtaining the mass, position and stiffness of the analytes arriving the resonator from the adsorption-induced eigenfrequency jumps. These results demonstrate the enormous potential of this technology for identification of large biological complexes near their native conformation, a goal that is beyond the capabilities of conventional mass spectrometers.
Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.
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Malvar
Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.
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Ruz
Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.
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Kosaka
Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.
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Domínguez
Matériaux et Phénomènes Quantiques, Université Paris Diderot, CNRS, Sorbonne Paris Cité, UMR 7162, 10 rue Alice Domon et Léonie Duquet, Paris 75013, France.
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Gil-Santos
Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.
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0000-0003-2414-5725
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Calleja
Institute of Microelectronics of Madrid (IMM-CSIC), Isaac Newton 8 (PTM), Tres Cantos, 28760 Madrid, Spain.
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Tamayo
D004926:Escherichia coli / Q000166:cytology*; D006046:Gold / Q000737:chemistry*; D040542:Mechanotransduction, Cellular / Q000502:physiology*; D053768:Metal Nanoparticles / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D036103:Nanotechnology / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000379:methods*
D006046:Gold