Areizaga Martínez, Héctor I.

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    Novel bio-inspired structures and sample translation approaches for the Raman detection of pharmaceutical agents in water
    (2016-06) Areizaga Martínez, Héctor I.; De Jesús Ruiz, Marco A.; College of Arts and Sciences - Sciences; Perales, Oscar; Rivera, Nilka; Román, Felix; Department of Chemistry; Cancelos, Silvina
    Over the years the widespread use of pharmaceuticals and personal care products (PPCPs) has become an emerging environmental problem affecting agriculture, ecological systems, and water quality as well. Surface Enhanced Raman Scattering (SERS) is emerging as a practical alternative for the detection and characterization of pharmaceuticals and bioactive compounds. This process demands the construction of new high performance substrates, with improved plasmonic responses to ensure sensitive and reproducible trace analysis determination. This research focused: (1) on the development of bio-inspired nanocomposite structures, which offer the opportunity to develop nanostructures with higher and more reproducible plasmonic fields. (2) The fabrication of an economical sample translational portable device (STPD), which could be used for on-site screening and real time analysis. The fabrication, characterization and evaluation of nine bioinspired nano plasmonic substrates was achieved with two of the arrays; the sunflower and the orchid. Both of these designs are the most promising patterns as SERS substrates with enhancement factor (EF) on the 108 – 109 range. This fact along with the development of a STPD have become an innovative tool for the Raman analysis of chemical agents such as Rhodamine 6G, 4-carboxybenzene sulfonamide and fluoroquinolones. The analytical capabilities to perform qualitative and quantitative analysis of such compounds will be discussed. Finally, the removal of PPCPs using transitions metals nanoparticles including cerium oxide was tested. The results show a promising potential for the fluoroquinolone and sulfonamide removal. This results promote the synthesis of zinc sulfide nanoparticles using an economical method involving the Stokes’ law for their future evaluation as a new tool for the removal of antimicrobial drugs.