1. Department of Chemistry , University of Ioannina , GR-451 10 Ioannina , Greece
2. Science Laboratory Center (EKPhE) of Preveza , GR-48100 Preveza , Greece
3. 1st ‘Agios Athanasios’ General Senior High School (Lykeion) , GR-57003 Thessaloniki , Greece
4. School of Health Sciences , Ulster University , Jordanstown , BT37 0QB , UK