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Colloids Interfaces 2018, 2(3), 29; https://doi.org/10.3390/colloids2030029

Hydrophobic Forces Are Relevant to Bacteria-Nanoparticle Interactions: Pseudomonas putida Capture Efficiency by Using Arginine, Cysteine or Oxalate Wrapped Magnetic Nanoparticles

1
Laboratory of Biosensors and Bioanalysis (LABB), Biochemistry Department, IQUIBICEN-CONICET, FCEN, UBA, Buenos Aires 1428, Argentina
2
Departamento de Química Inorgánica, Analítica y Química Física, FCEN, UBA, Buenos Aires 1428, Argentina
*
Authors to whom correspondence should be addressed.
Received: 23 May 2018 / Revised: 9 July 2018 / Accepted: 15 July 2018 / Published: 18 July 2018
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Abstract

Size, shape and surface characteristics strongly affect interfacial interactions, as the presented among iron oxide nanoparticles (NPs) aqueous colloids and bacteria. In other to find the forces among this interaction, we compare three types of surface modified NPs (exposing oxalate, arginine or cysteine residues), based on a simple synthesis and derivation procedure, that allows us to obtain very similar NPs (size and shape of the magnetic core). In this way, we assure that the main difference in the synthesized NPs are the oxalate or amino acid residue exposed, an ideal situation to compare their bacterial capture performance, and so too the interactions among them. Field emission scanning electron microscopy showed homogeneous distribution of particle sizes for all systems synthesized, close to 10 nm. Magnetization, zeta potential, Fourier transformed infrared spectrometry and other studies allow us further characterization. Capture experiments of Pseudomonas putida bacterial strain showed a high level of efficiency, independently of the amino acid used to wrap the NP, when compared with oxalate. We show that bacterial capture efficiency cannot be related mostly to the bacterial and NP superficial charge relationship (as determined by z potential), but instead capture can be correlated with hydrophobic and hydrophilic forces among them. View Full-Text
Keywords: amino acid; bacteria; FT-IR spectra; magnetite; Pseudomonas putida; interfacial interactions; synthesis amino acid; bacteria; FT-IR spectra; magnetite; Pseudomonas putida; interfacial interactions; synthesis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Figueredo, F.; Saavedra, A.; Cortón, E.; Diz, V.E. Hydrophobic Forces Are Relevant to Bacteria-Nanoparticle Interactions: Pseudomonas putida Capture Efficiency by Using Arginine, Cysteine or Oxalate Wrapped Magnetic Nanoparticles. Colloids Interfaces 2018, 2, 29.

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