Naslov
Free radical detection in water after processing by means of high voltage electrical discharges and high power ultrasound

Autori
Režek Jambrak, Anet ; Ojha, Shikha ; Šeremet, Danijela ; Nutrizio, Marinela ; Maltar‐Strmečki, Nadica ; Valić, Srećko ; Gajdoš Kljusurić, Jasenka ; Tiwari, Brijesh

Izvornik
Journal of food processing and preservation (0145-8892) 45 (2020), 2; E15176, 15

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Free radical ; EPR ; high voltage electrical discharges ; high power ultrasound

Sažetak
Nonthermal processing technologies have been researched in lab scale for more than 15 years. In this study, the influence of sonification and high voltage electrical discharge—plasma treatment of water on the formation and stabilization of hydroxyl radicals has been investigated by electron paramagnetic resonance (EPR) spectroscopy and spin‐trapping method. As analysis tool, an agglomerative hierarchical clustering was used in grouping samples recorded by EPR and near infrared spectroscopy (NIR) spectroscopy. Also, the multivariate analysis was performed using the principal component analysis (PCA) and Principal Regression models (PCR). Results for ultrasound‐treated samples showed that number of radicals is increasing with treatment time and increase in amplitude. High‐ voltage electrical discharge treatment at 120 Hz resulted in the formation of the largest number of hydroxyl radicals. Developed PCR models are highly effective in prediction of NIR spectra, regardless the sample treatment what is an additional step forward in green technology.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Prehrambena tehnologija

POVEZANOST RADA