Smokrović, Kristina; Pleslić, Sanda; Markić, Franka; Muratović, Senada; Vukušić Pavičić, Tomislava; Stulić, Višnja; Zadravec, Manuela; Maltar-Strmečki, Nadica (2026) Detection of residual free radicals in tomato juice processed by stand-alone and combined ultrasonic and ultraviolet treatments. Applied food research, 6 (1). p. 101988. ISSN 2772-5022
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Abstract
This study investigated the effects of ultraviolet-A (UV-A), ultrasound (US), and combined UV–A/US treatments on bioactive compounds, antioxidant activity, and free radical generation in tomato pulp. Individual bioactive compounds responded differently to UV-A, US, and combined UV–A/US treatments, depending on treatment conditions and number of cycles. The highest total polyphenol content (TPC) was obtained under UV-A irradiation at 50 mW in the third treatment cycle (224.71 mg/L GAE), while lycopene and beta-carotene reached their maximum concentrations under UV-A at 100 mW (1.287 µg/mL and 0.286 µg/mL, respectively). The highest reduction of the EPR–DPPH signal was observed under combined UV–A/US treatment (31.49 %), whereas the US treated sample (60 % of amplitude) showed the lowest reduction (15.12 %). CMH spin trapping measurements showed that CP equivalents increased with treatment intensity and number of cycles, with the highest CP value (73.72 µmol/L) obtained under ultrasound treatment at 90 % amplitude after three cycles. UV-A treatment alone resulted in lower CP values, which increased gradually with higher irradiation power and additional cycles.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | food processing; UV-A irradiation; ultrasound processing; EPR spectroscopy; free radicals; antioxidant; tomato juice | ||||||||
| Subjects: | NATURAL SCIENCES > Physics NATURAL SCIENCES > Chemistry BIOTECHNICAL SCIENCES > Food Technology |
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| Divisions: | Division of Physical Chemistry | ||||||||
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| Depositing User: | Franka Markić | ||||||||
| Date Deposited: | 13 May 2026 09:06 | ||||||||
| URI: | https://fulir.irb.hr:/id/eprint/11934 | ||||||||
| DOI: | 10.1016/j.afres.2026.101988 |
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