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Method for the quantitative extraction of gold nanoparticles from human bronchoalveolar lavage fluids through a glycerol gradient

Abstract

Bronchoalveolar lavage (BAL) is a diagnostic procedure which samples the cellular and non- cellular components of the pulmonary epithelial surface. The inherent biological noise of BAL fluids inhibits their direct mineralogical analysis while currently available particle retrieval protocols are suspected to impose quantitative and qualitative bias on the studied particle load. This study presents a simple method for the near-lossless extraction of citrate-capped gold nanoparticles from human BAL fluids at sub-ppm levels which enables their quantitation and surface characterization. The procedure was modeled according to fundamental principles of particle sedimentation and liquid-liquid interdiffusion and was evaluated by a battery of analytical techniques. The extraction yield of gold nanoparticles ranged from 61 to 86%, with a quantitation limit at 0.5 μg ml−1, as measured by inductively-coupled optical emission spectroscopy. Dynamic light scattering could resolve the hydrodynamic size distribution of extracted particles which returned significantly different photon count rates at various concentrations. Their shape and primary size was easily observable by electron microscopy while atomic force microscopy, Auger electron spectroscopy and X-ray photoelectron spectroscopy could respectively probe the particles’ biomolecular corona, detect surface-adsorbed S– and N– species, and identify carbon-based covalent bonds.

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Publication details

The article was received on 21 Jun 2017, accepted on 28 Dec 2017 and first published on 28 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR04484D
Citation: Nanoscale, 2017, Accepted Manuscript
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    Method for the quantitative extraction of gold nanoparticles from human bronchoalveolar lavage fluids through a glycerol gradient

    D. Bitounis, V. BARNIER, C. Guibert, J. Pourchez, V. Forest, D. Boudard, J. F. Hochepied, P. Chelle, J. Vergnon and M. Cottier, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04484D

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