1. Contribution from the Nanobiotechnology and Bioanalysis Group, Department of Chemical Engineering, Universitat Rovira i Virgili, Tarragona, Spain, and Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Company 23, 08010 Barcelona, Spain, and Department of Chemistry, Faculty of Science, Mansoura University, 34517 Dumyat, Egypt