Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: I. D. Postescu, C. Tatomir, G. Chereches, I. Brie, G. Damian, D. Petrisor, A-M. Hosu, V. Miclaus, A. Pop
Editorial: INOE&INFM, Journal of Optoelectronics and Advanced Materials, 9(3), p.564-567, 2007.
Some varieties of grapes, namely, Burgund Mare (BMR), Cabernet-Sauvignon (CSR), Muscat-Hamburg (MHR), Merlot(MR), Merlot Dealu-Mare (MDM) from a wine production area in Romania,Recas, were investigated in order to find optimal efficiency of certain extraction procedures for satisfactory polyphenolic composition and to evaluate their antioxidant activities. Total polyphenols content of studied extracts, was determined according to Folin-Ciocalteu methodology. The
antioxidant capacity (reducing power) was performed by ESR spectroscopy and spectrophotometry with DPPH as radical scavenger.The antioxidant activity was found following order: seeds>skins>clusters; that might be explained by a corresponding decrease of activity with decrease of total phenolic contents.
Cuvinte cheie: Grapes, Antioxidants, Spectrophotometry, ESR spectroscopy, DPPH, Tempol