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Ultrasound‑assisted Modification of Enzymatic and Antioxidant Activities, Functional and Rheological Properties of Oat and Barley Bran

Grgić, Tomislava; Pavišić, Zrinka; Maltar‑Strmečki, Nadica; Voučko, Bojana; Čukelj Mustač, Nikolina; Ćurić, Duška; Le‑Bail, Alain; Novotni, Dubravka (2023) Ultrasound‑assisted Modification of Enzymatic and Antioxidant Activities, Functional and Rheological Properties of Oat and Barley Bran. Food and Bioprocess Technology, 16 . pp. 2416-2429. ISSN 1935-5130

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Cereal bran possesses enzymes and antinutrients which should be reduced for their usability as a food ingredient high in dietary fiber, minerals, and antioxidants. This study investigated the influence of high-intensity ultrasound on enzymatic and antioxidant activities, phytic acid content (PA), and functional and rheological properties of oat and barley bran. Ultrasonication was performed at three specific energies (87 kJ/kg, 217.5 kJ/kg, and 348 kJ/kg), without or with pulsation (5 s emission, 10 s pause). Bran was assessed for β-glucanase, phytase and antioxidant activities, PA and total phenolic content, hydration, and rheological properties. β- glucanase from oat bran was inactivated up to 82% and from barley bran up to 55%, depending on the ultrasound-specific energy and pulsation. PA and antioxidant activities were higher in native oat bran (PA 17.35 mg/g d.w., FRAP 6.96 μmol TE/g d.w., 3.30 μmol FAE/g d.w.) compared to barley bran (PA 11.53 mg/g d.w., FRAP 2.27 μmol TE/g d.w., 5.30 μmol FAE/g d.w.). In both bran types, phytase activity increased (40–44%) after treatments at 87 kJ/kg, and on average, PA was reduced by 17% in oat bran and by 39% in barley bran. Depending on the energy and pulsation, bran ultrasonication reduced total phenolic content (27–55%), antioxidant activity (by 28–48%), complex viscosity (62–71%), and maximum stress tolerance (46–68%) while increased water swelling (42–48%) and retention capacity (44–59%). Hence, high-intensity ultrasound is a useful technique in reducing antinutrients while altering the enzymatic activity and functional properties of the bran. These results could help the wider application of bran in food production.

Item Type: Article
Uncontrolled Keywords: cereal β-glucanase activity ; complex viscosity ; phytase activity ; phenolic compounds ; phytic acid
Subjects: NATURAL SCIENCES > Physics
BIOMEDICINE AND HEALTHCARE > Public Health and Health Care
Divisions: Division of Physical Chemistry
Project titleProject leaderProject codeProject type
Flat Bread of Mediterranean area; INnovation & Emerging process & technology-FLATBREADMINEDubravka Novotni[2031] [FLAT BREAD MINE] [Call 2020 Section 1 Agrofood IA]EK
Depositing User: Nadica Maltar Strmečki
Date Deposited: 05 Oct 2023 13:51
DOI: 10.1007/s11947-023-03074-5

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