phone: (787) 832-4040 ext. 2911 email: marco.dejesus@upr.edu office: Q-134 website: http://academic.uprm.edu/marco.dejesus Lab: Q-031/127

EducationPh.D. University of Tennessee, Knoxville, 2004RecognitionsInformation unavailableTeaching InterestsAnalytical chemistryResearch InterestsAnalytical chemical separations: Our separations research program is dedicated to the development of liquid and gas chromatography procedures for trace detection of pharmaceutical and personal care products (PPCPs), pesticides antimicrobials and other emerging pollutants of environmental interest. Fundamental work focuses on studies involving colloidal suspensions as additives in surface and wastewater treatment. These additives include polymer microcomposites, encapsulated iron and titanium dioxide microspheres, and natural fibers. Our separations work is applied to samples of environmental, agricultural, and pharmaceutical significance. Chemical Sensing: Methods to nanolithographically construct dense arrays of metal nanocomposites as plasmonic sensors are being developed. Procedures to depositing noble metals and transition/noble metals alloys on the immobilized nanostructures to investigate the interfacial interactions of neuritic deposits, food pathogens, antimicrobial drugs and bioactive agents of environmental and biomedical significance are being developed. The composite surface acts as a molecular recognition element with sorptive and optical properties that can be tailored for enhanced selectivity and operational wavelengths. The nanostructured surfaces are used to increase the effective Raman cross section and loading capacity enabling an enhanced surface plasmon excitation for the detection and quantitation of bioactive agents in a variety of matrices by Surface Enhanced Raman Scattering. Applications for these novel sensing technologies abound in the environmental, biomedical, food safety and toxicological fields. Raman Spectroscopy: Sensitive methods for the Raman detection of antimicrobials, b-amyloid peptides, and food pathogens via SERS detection are being developed using nanolithography and physical vapor deposition (PVD) methods. The sensitivity and detailed structural information attainable through SERS has been exploited for the detection of a variety of aromatic pollutants of environmental significance (arsenic drugs, fluoroquinolones, bacterial strains, etc.).