Pleslić, Sanda; Markić, Franka; Vukušić Pavičić, Tomislava; Stulić, Višnja; Maltar-Strmečki, Nadica (2025) Plasma-Assisted Extraction of Bioactive Compounds from Tomato Peels and Sugar Beet Leaves Monitored by Electron Paramagnetic Resonance Spectroscopy. Applied Sciences, 15 (24). ISSN 2076-3417
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Abstract
Agricultural by-products, such as tomato peels and sugar beet leaves, represent valuable sources of bioactive compounds that can be efficiently recovered using advanced extraction techniques. This study investigated the efficiency of high-voltage electrical discharge (HVED) extraction of bioactive compounds and antioxidant properties from tomato peel (TP) and sugar beet leaves (SBLs). The target compounds were total phenolic content (TPC), lycopene, β-carotene, and chlorophylls. HVED treatments of 1, 3, and 5 min were applied using 30% and 50% methanolic solutions. A 5 min treatment enhanced the extraction of lycopene (2.04 mg/100 mL) and β-carotene (1.14 mg/100 mL) in the 50% methanolic solution, while the shorter 3 min treatments increased TPC (0.117 mg GAE/mL in TP; 0.280 mg GAE/mL in SBLs) and chlorophyll content (25.47 mg/100 mL). For both TP and SBLs, the more concentrated methanolic solvent (50%) was more efficient in extracting bioactive components than the 30% solution. Electron paramagnetic resonance (EPR) spectroscopy confirmed increases in antioxidant activity in all treated samples, with the highest values of 45.27% for TP and 53.16% for SBLs. As a direct and sensitive technique for detecting free-radical scavenging, EPR proved highly suitable for evaluating the impact of HVED treatments. Overall, HVED demonstrated strong potential as a green and effective method for enhancing the recovery of valuable bioactives and antioxidant properties from tomato and sugar beet by-products.
| Item Type: | Article | ||||||||
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| Uncontrolled Keywords: | high voltage electrical discharge; tomato peel; sugar beet leaves; antioxidant activity; bioactive compounds; EPR spectroscopy | ||||||||
| 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: | Nadica Maltar Strmečki | ||||||||
| Date Deposited: | 31 Dec 2025 08:41 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/10634 | ||||||||
| DOI: | 10.3390/app152413258 |
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