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Loretta L. del Mercato

Nanoscience Institute-CNR
UOS National Nanotechnology Laboratory (NNL)
loretta.delmercato@nano.cnr.it
Research interests

My current research interests cover the synthesis and engineering of multifunctional carriers systems for medical diagnosis and bio-applications (drug/gene delivery, biological sensing) and their morphological and structural characterization via several imaging tools (e.g., Scanning Probe Microscopy, Confocal Laser Microscopy, Electron Micrsocopy). Precisely, we are interested on designing capsules based diagnostic carrier systems for non-invasive, real-time, multiplex sensing of analytes in living cells and in vivo. In addition we investigate the use of these systems as drug delivery carriers.

My latest research interests has concerned the assembly of multifunctional capsules with different geometries and functions:
(1) ratiometric sensor capsules for multiple real-time sensing of ions (sodium, potassium, and protons);
(2) biodegradable capsules for controlled release of molecules in cells;
(3) Nanoparticle-modified polyelectrolyte capsules for remote opening of capsules under microwave irradiation in cells.


Biographical sketch

April 2010 – Present
Researcher at Nanoscience Institute – National Research Council (CNR), Lecce, Italy
National Nanotechnology Laboratory, Nanobiomolecular Electronics and Nanobiotechnology (NEN)

February 2008 – March 2010
Post doctoral researcher at Philipps University of Marburg, Germany
Department of Physics, Biophotonics Division, Prof. Wolfgang J. Parak

October 2007 – January 2008
Research Fellow at Nanoscience Institute – National Research Council (CNR), Lecce, Italy
National Nanotechnology Laboratory, Nanobiomolecular Electronics and Nanobiotechnology (NEN)

July 2004 – September 2007
PhD with fellowship in “Innovative Materials and Technologies”, Nanoscience Institute – National Research Council (CNR), Lecce, Italy
National Nanotechnology Laboratory, Nanobiomolecular Electronics and Nanobiotechnology (NEN)

May 2004 – June 2004
Research Fellow at Nanoscience Institute – National Research Council (CNR), Lecce, Italy
National Nanotechnology Laboratory, Nanobiomolecular Electronics and Nanobiotechnology (NEN)

February 2004 – April 2004
Tutor and Advisor of Diploma students at SofTel (Center for Orientation, Training and Teaching) University “Federico II”, Naples, Italy

September 1997 – January 2004
MSc in Biotechnology, University “Federico II”, Naples, Italy


2008: Member of the Local Organization Committee of the International Conference “Colloidal Nanoparticles - From Synthesis to Biological Applications”.
2006:“Best Student” prize from SISSA for her seminar on elastic and conductive properties of amyloid-like fibrils (3rd Nat. Conference on Nanoscience and Nanotechnology, Trieste).
2009: Grant by the European Cooperation in Science and Technology Office (COST) supported by the EU FP for her work on polyelectrolyte capsules as drug delivery systems for cells (XVII Int. Conference on Bioencapsulation, University Medical Center Groningen, The Netherlands).

(Co-)author of 22 articles on peer reviewed journals, 1 chapter in a Book and 1 international patent.

Journal articles

2011
2010
2009
2008
L L del Mercato, G Maruccio, P Paolo Pompa, B Bochicchio, A M Tamburro, R Cingolani, R Rinaldi (2008)  Amyloid-like fibrils in elastin-related polypeptides: structural characterization and elastic properties.   BIOMACROMOLECULES 9: 3. 796-803  
Abstract: We report on the structural characterization of amyloid-like fibrils, self-assembled from synthetic polypentapeptides poly(ValGlyGlyLeuGly), whose monomeric sequence is a recurring, simple building block of elastin. This polymer adopts a beta-sheet structure as revealed by circular dichroism and Fourier transform infrared spectroscopy. Furthermore, Thioflavin-T and Congo red birefringence assays confirm the presence of amyloid-like structures. To analyze the supramolecular assembly and elastic properties of the fibrils, we employed atomic force microsocopy and spectroscopy, measuring also the elasticity of mature elastin for a comparative analysis. In the case of fibrils we estimated a Young's modulus ranging from 3.5 to 7 MPa, whereas for elastin it is around 1 MPa. The possibility to section individual fibrils with nanometric control by the AFM tip, realizing biomolecular gaps in the 100 nm range, is also demonstrated. These results are expected to open interesting perspectives for the fabrication of protein-inspired nanostructures with specific physical and chemical properties for applications in biotechnology and tissue engineering.
Notes:
2007
L L del Mercato, P P Pompa, G Maruccio, A Della Torre, S Sabella, A Mario Tamburro, R Cingolani, R Rinaldi (2007)  Charge transport and intrinsic fluorescence in amyloid-like fibrils.   Proc Natl Acad Sci U S A 104: 46. 18019-18024  
Abstract: The self-assembly of polypeptides into stable, conductive, and intrinsically fluorescent biomolecular nanowires is reported. We have studied the morphology and electrical conduction of fibrils made of an elastin-related polypeptide, poly(ValGlyGlyLeuGly). These amyloid-like nanofibrils, with a diameter ranging from 20 to 250 nm, result from self-assembly in aqueous solution at neutral pH. Their morphological properties and conductivity have been investigated by atomic force microscopy, scanning tunneling microscopy, and two-terminal transport experiments at the micro- and nanoscales. We demonstrate that the nanofibrils can sustain significant electrical conduction in the solid state at ambient conditions and have remarkable stability. We also show intrinsic blue-green fluorescence of the nanofibrils by confocal microscopy analyses. These results indicate that direct (label-free) excitation can be used to investigate the aggregation state or the polymorphism of amyloid-like fibrils (and possibly of other proteinaceous material) and open up interesting perspectives for the use of peptide-based nanowire structures, with tunable physical and chemical properties, for a wide range of nanobiotechnological and bioelectronic applications.
Notes:
2006
P P Pompa, A Della Torre, L L del Mercato, R Chiuri, A Bramanti, F Calabi, G Maruccio, R Cingolani, R Rinaldi (2006)  Charge transport in disordered films of non-redox proteins.   J Chem Phys 125: 2. 021103-021107  
Abstract: Electrical conduction in solid state disordered multilayers of non-redox proteins is demonstrated by two-terminal transport experiments at the nanoscale and by scanning tunneling microscopy (STM/STS experiments). We also show that the conduction of the biomolecular films can be modulated by means of a gate field. These results may lead to the implementation of protein-based three-terminal nanodevices and open important new perspectives for a wide range of bioelectronic/biosensing applications.
Notes:
2005

Book chapters

2010
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