title: Gas phase plasma impact on phenolic compounds in pomegranate juice.
abstract: The aim of the study was to evaluate the effect of gas phase plasma on phenolic compounds in pomegranate juice. The potential of near infrared reflectance spectroscopy combined with partial least squares for monitoring the stability of phenolic compounds during plasma treatment was explored, too. Experiments are designed to investigate the effect of plasma operating conditions (treatment time 3, 5, 7 min; sample volume 3, 4, 5 cm(3); gas flow 0.75, 1, 1.25 dm(3) min(-1)) on phenolic compounds and compared to pasteurized and untreated pomegranate juice. Pasteurization and plasma treatment resulted in total phenolic content increasing by 29.55% and 33.03%, respectively. Principal component analysis and sensitivity analysis outputted the optimal treatment design with plasma that could match the pasteurized sample concerning the phenolic stability (5 min/4 cm(3)/0.75 dm(3) min(-1)). Obtained results demonstrate the potential of near infrared reflectance spectroscopy that can be successfully used to evaluate the quality of pomegranate juice upon plasma treatment considering the phenolic compounds.
authors.affiliation: Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia.
authors.forename: Zoran
authors.initials: Z
authors.lastname: Herceg
authors.affiliation: Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia. Electronic address: dbursac@pbf.hr.
authors.forename: Danijela Bursać
authors.initials: DB
authors.lastname: Kovačević
authors.affiliation: Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia.
authors.forename: Jasenka Gajdoš
authors.initials: JG
authors.lastname: Kljusurić
authors.affiliation: Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia.
authors.forename: Anet Režek
authors.initials: AR
authors.lastname: Jambrak
authors.affiliation: Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia.
authors.forename: Zoran
authors.initials: Z
authors.lastname: Zorić
authors.affiliation: Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia.
authors.forename: Verica
authors.initials: V
authors.lastname: Dragović-Uzelac
mesh_terms: D001628:Beverages / Q000032:analysis*; D016018:Least-Squares Analysis; D029561:Lythraceae / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*; D025341:Principal Component Analysis; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D010636:Phenols
keywords: Cold atmospheric gas phase plasma; Near infrared reflectance spectroscopy; Phenolic compounds; Pomegranate juice