Search results for: Leonidas G. Bachas

Items from 1 to 20 out of 63 results

article

Metal oxide semiconductor nanomaterial for reductive debromination: Visible light degradation of polybrominated diphenyl ethers by Cu2O@Pd nanostructures

Edward B. Miller, Elsayed M. Zahran, Marc R. Knecht, Leonidas G. Bachas

Applied Catalysis B: Environmental > 2017 > 213 > C > 147-154

Polybrominated diphenyl ethers (PBDEs), which have found extensive use as flame-retarding additives to many polymer materials, are now environmentally ubiquitous and persistent pollutants that present potential health risks to humans and wildlife. Herein, we report for the first time the use of metal oxide semiconductor nanostructures for photocatalytic reductive debromination of PBDEs using visible...

article

Environmental PCBs in Guánica Bay, Puerto Rico: implications for community health

Naresh Kumar, Daisy Ramirez-Ortiz, Helena M. Solo-Gabriele, Joseph B. Treaster, more

Environmental Science and Pollution Research > 2016 > 23 > 3 > 2003-2013

Guánica Bay, located in southwestern Puerto Rico, has suffered oil spills and other pollution discharges since the 1960s. Previous research showed elevated concentrations of polychlorinated biphenyls (PCBs) in coral reef and sediment. This research examined PCB concentrations in sediment and fish. Sediment and fish sampling in the bay was facilitated by community members. This study identified the...

article

Preorganized composite material of polyaniline–palladium nanoparticles with high electrocatalytic activity to methanol and ethanol oxidation

Mamas I. Prodromidis, Elsayed M. Zahran, Andreas G. Tzakos, Leonidas G. Bachas

International Journal of Hydrogen Energy > 2015 > 40 > 21 > 6745-6753

We report a simple method for the preparation of a stabilized palladium nanoparticle-polyaniline composite by mixing aniline and PdCl42− in aqueous acidic solutions. Pd nanoparticles (Pd NP) were produced by subsequent reduction of the pre-organized material with different concentrations of NaBH₄. Under optimum conditions (0.1 M NaBH₄ in ethanol for 1 h at 0 °C), Pd NP with a size of 5–10 nm were...

article

Reactivity of Pd/Fe bimetallic nanotubes in dechlorination of coplanar polychlorinated biphenyls

Elsayed M. Zahran, Dibakar Bhattacharyya, Leonidas G. Bachas

Chemosphere > 2013 > 91 > 2 > 165-171

A new class of bimetallic materials based on palladium-decorated iron nanotubes is described that demonstrates high reactivity in dechlorination reactions. This high dechlorination efficiency was attributed to the high surface area to volume ratio of the hollow nanotubes structure. Herein, we evaluated the effect of different conditions, such as the nanotube size, and the palladium loading on the...

article

Bifunctional bisphosphonates for delivering PTH (1-34) to bone mineral with enhanced bioactivity

Jivan N. Yewle, David A. Puleo, Leonidas G. Bachas

Biomaterials > 2013 > 34 > 12 > 3141-3149

The objective of this work was to demonstrate the bioactivity of parathyroid hormone (1-34) (PTH) delivered through a single molecule of bisphosphonate to improve tissue/cell interactions. Bifunctional hydrazine-bisphosphonates (HBPs) with varying length and lipophilicity were used as a drug delivery vehicle. PTH was oxidized with periodate treatment to obtain an N-terminal aldehyde that was then...

article

Selectivity properties of corrin-doped polypyrrole film

Ayça Demirel Özel, Emre Dikici, Leonidas G. Bachas

Monatshefte für Chemie - Chemical Monthly > 2013 > 144 > 6 > 781-791

We report the synthesis of a new pyrrole-substituted vitamin B₁₂ derivative functioning as a corrin monomer, its electrochemical copolymerization with pyrrole, and the potentiometric behavior of the resultant electrodes based on the corrin-doped polypyrrole film. Electropolymerization of the corrin monomer on a glassy carbon electrode and its redox properties were evaluated by cyclic voltammetry in...

article

Palladium nanoparticle-decorated iron nanotubes hosted in a polycarbonate porous membrane: development, characterization, and performance as electrocatalysts of ascorbic acid

Elsayed M. Zahran, Mamas I. Prodromidis, Dibakar Bhattacharyya, Leonidas G. Bachas

Analytical and Bioanalytical Chemistry > 2012 > 404 > 6-7 > 1637-1642

One-dimensional iron metallic nanotubes were prepared by electroless deposition within the pores of polycarbonate (PC) membranes. The longitudinal nucleation of the nanotubes along the pore walls was achieved by mounting the PC membrane between two halves of a U-shaped reaction tube. Palladium nanoparticles were post-deposited on the inner wall of the nanotubes. The composition, morphology, and structure...

article

Enhanced Affinity Bifunctional Bisphosphonates for Targeted Delivery of Therapeutic Agents to Bone

Jivan N. Yewle, David A. Puleo, Leonidas G. Bachas

Bioconjugate Chemistry > 2011 > 22 > 12 > 2496 - 2506

article

Ion-Selective Electrodes Based on a Pyridyl-Containing Triazolophane: Altering Halide Selectivity by Combining Dipole-Promoted Cooperativity with Hydrogen Bonding

Elsayed M. Zahran, Yuran Hua, Semin Lee, Amar H. Flood, more

Analytical Chemistry > 2011 > 83 > 9 > 3455 - 3461

article

Electrochemical properties and temperature dependence of a recombinant laccase from Thermus thermophilus

Xin Liu, Megan Gillespie, Ayca Demirel Ozel, Emre Dikici, more

Analytical and Bioanalytical Chemistry > 2011 > 399 > 1 > 361-366

The electrochemical properties of a laccase from Thermus thermophilus HB27 (Tth-laccase) were characterized. The gene encoding the laccase was cloned and overexpressed in Escherichia coli. One-step purification of the corresponding apo-enzyme was achieved by nickel-affinity chromatography. Copper was incorporated into the apo-laccase as the cofactor to yield the holo-enzyme. The temperature-dependent...

article

Can Temperature Be Used To Tune the Selectivity of Membrane Ion-Selective Electrodes?

Elsayed M. Zahran, Vasileios Gavalas, Manuel Valiente, Leonidas G. Bachas

Analytical Chemistry > 2010 > 82 > 9 > 3622 - 3628

article

Triazolophanes: A New Class of Halide-Selective Ionophores for Potentiometric Sensors

Elsayed M. Zahran, Yuran Hua, Yongjun Li, Amar H. Flood, more

Analytical Chemistry > 2010 > 82 > 1 > 368 - 375

article

Morphological control of Ni/NiO core/shell nanoparticles and production of hollow NiO nanostructures

Nitin Chopra, Leslie Claypoole, Leonidas G. Bachas

Journal of Nanoparticle Research > 2010 > 12 > 8 > 2883-2893

Chemical synthesis coupled with a microwave irradiation process allowed for the control of size (6–40 nm), shape, and shell thickness of Ni/NiO core/shell nanoparticles. In this unique synthetic route, the size of Ni nanoparticles (NiNPs) was strongly influenced by the nickel salt-to-stabilizer ratio and the amount of the stabilizer. Interestingly, it was observed that the shape of the nanoparticles...

article

Fabrication and Biofunctionalization of Carbon-Encapsulated Au Nanoparticles

Nitin Chopra, Leonidas G. Bachas, Marc R. Knecht

Chemistry of Materials > 2009 > 21 > 7 > 1176 - 1178

article

Reductive dechlorination of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) using palladium or palladium/iron nanoparticles and assessment of the reduction in toxic potency in vascular endothelial cells

Karthik Venkatachalam, Xabier Arzuaga, Nitin Chopra, Vasilis G. Gavalas, more

Journal of Hazardous Materials > 2008 > 159 > 2-3 > 483-491

Palladium-based nanoparticles immobilized in polymeric matrices were applied to the reductive dechlorination of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) at room temperature. Two different dechlorination platforms were evaluated using (1) Pd nanoparticles within conductive polypyrrole films; or (2) immobilized Fe/Pd nanoparticles within polyvinylidene fluoride microfiltration membranes. For the first...

article

Microfluidic ion-sensing devices

R. Daniel Johnson, Vasilis G. Gavalas, Sylvia Daunert, Leonidas G. Bachas

Analytica Chimica Acta > 2008 > 613 > 1 > 20-30

Quantitative determinations of ions in a variety of media have been performed traditionally via one of three approaches: optical instrumental methods (e.g., atomic absorption, and inductively-coupled plasma-optical emission or mass spectrometry), “wet” methods, or ion-selective sensors. Each of the approaches, though, possesses limitations including: power/reagent consumption and lack of portability...

article

Ligand-Modified Aminobisphosphonate for Linking Proteins to Hydroxyapatite and Bone Surface

Robin S. Ehrick, Marcello Capaccio, David A. Puleo, Leonidas G. Bachas

Bioconjugate Chemistry > 2008 > 19 > 1 > 315 - 321

article

Biosensor incorporating cell barrier architectures on ion selective electrodes for early screening of cancer

Gargi Ghosh, Leonidas G. Bachas, Kimberly W. Anderson

Analytical and Bioanalytical Chemistry > 2008 > 391 > 8 > 2783-2791

Angiogenesis occurs during the early phase of cancer. Recruitment of new blood vessels by existing cancer cells leads to the release of higher concentrations of cytokines as compared to cells in healthy individuals. Some of the common cytokines observed at higher concentrations, such as vascular endothelial growth factor, basic fibroblast growth factor, hepatocyte growth factor and tumor necrosis...

article

Selected Chloro-Organic Detoxifications by Polychelate (Poly(acrylic acid)) and Citrate-Based Fenton Reaction at Neutral pH Environment

YongChao Li, Leonidas G. Bachas, Dibakar Bhattacharyya

Industrial & Engineering Chemistry Research > 2007 > 46 > 24 > 7984 - 7992

article

Centrifugal Microfluidics with Integrated Sensing Microdome Optodes for Multiion Detection

Amanda S. Watts, Aaron A. Urbas, Elissavet Moschou, Vasilis G. Gavalas, more

Analytical Chemistry > 2007 > 79 > 21 > 8046 - 8054

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Search results for: Leonidas G. Bachas

Metal oxide semiconductor nanomaterial for reductive debromination: Visible light degradation of polybrominated diphenyl ethers by Cu2O@Pd nanostructures

Environmental PCBs in Guánica Bay, Puerto Rico: implications for community health

Preorganized composite material of polyaniline–palladium nanoparticles with high electrocatalytic activity to methanol and ethanol oxidation

Reactivity of Pd/Fe bimetallic nanotubes in dechlorination of coplanar polychlorinated biphenyls

Bifunctional bisphosphonates for delivering PTH (1-34) to bone mineral with enhanced bioactivity

Selectivity properties of corrin-doped polypyrrole film

Palladium nanoparticle-decorated iron nanotubes hosted in a polycarbonate porous membrane: development, characterization, and performance as electrocatalysts of ascorbic acid

Enhanced Affinity Bifunctional Bisphosphonates for Targeted Delivery of Therapeutic Agents to Bone

Ion-Selective Electrodes Based on a Pyridyl-Containing Triazolophane: Altering Halide Selectivity by Combining Dipole-Promoted Cooperativity with Hydrogen Bonding

Electrochemical properties and temperature dependence of a recombinant laccase from Thermus thermophilus

Can Temperature Be Used To Tune the Selectivity of Membrane Ion-Selective Electrodes?

Triazolophanes: A New Class of Halide-Selective Ionophores for Potentiometric Sensors

Morphological control of Ni/NiO core/shell nanoparticles and production of hollow NiO nanostructures

Fabrication and Biofunctionalization of Carbon-Encapsulated Au Nanoparticles

Reductive dechlorination of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) using palladium or palladium/iron nanoparticles and assessment of the reduction in toxic potency in vascular endothelial cells

Microfluidic ion-sensing devices

Ligand-Modified Aminobisphosphonate for Linking Proteins to Hydroxyapatite and Bone Surface

Biosensor incorporating cell barrier architectures on ion selective electrodes for early screening of cancer

Selected Chloro-Organic Detoxifications by Polychelate (Poly(acrylic acid)) and Citrate-Based Fenton Reaction at Neutral pH Environment

Centrifugal Microfluidics with Integrated Sensing Microdome Optodes for Multiion Detection

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