1. Department of Organic Chemistry and Biochemistry, University of Naples “Federico II”, Complesso Universitario Monte S. Angelo, Via Cinthia 4, I-80126 Naples, Italy, Institute of Food Sciences, National Research Council, via Roma 52 A/C, 83100 Avellino, Italy, and Laboratory of Biochemistry and Molecular Biology, Zoological Station “Anton Dohrn”, Villa Comunale, I-80121 Naples, Italy