Antioxidant and prooxidant activity of acid‐hydrolyzed phenolic extracts of sugar beet leaves in oil‐in‐water emulsions

The Journal of the American Oil Chemists’ Society Pub Date : 2024-08-09 DOI:10.1002/aocs.12891

Peyman Ebrahimi, Ipek Bayram, Anna Lante, Eric A. Decker

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Abstract

This study aimed to enhance the oxidative stability of soybean oil‐in‐water emulsions using acid‐hydrolyzed and unhydrolyzed extracts obtained from sugar beet leaves. The optimum extraction process, which includes 8 min of ultrasonication followed by a 2‐h acid hydrolysis, released new phenolics (e.g., catechin, myricetin, etc.) and increased the total phenolic content (TPC) from 586.24 ± 11.45 to 982.42 ± 6.61 μmol gallic acid equivalent (GAE)/L, and 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) radical inhibition from 46.63 ± 1.39 to 60.87 ± 1.12%. Acid hydrolysis increased the cupric chelating activity of the extracts while decreasing ferrous chelating activity and trans‐ferulic acid concentration significantly (p < 0.05). The acid‐hydrolyzed extract at a TPC of 100 μmol GAE/L prolonged the lag phase of hexanal accumulation in the emulsion from 0 to 8 days, while 400 μmol GAE/L TPC of unhydrolyzed extract increased the lag phase to 12 days. The results show that acid‐hydrolyzed extracts in high concentrations may act as prooxidants.

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水包油型乳剂中甜菜叶酸水解酚提取物的抗氧化和促氧化活性

本研究旨在利用从甜菜叶中提取的酸水解和未水解提取物提高水包大豆油乳剂的氧化稳定性。最佳萃取过程包括 8 分钟的超声波处理和 2 小时的酸水解，可释放出新的酚类物质（如儿茶素、没食子酸等）、总酚含量（TPC）从 586.24 ± 11.45 μmol 没食子酸当量（GAE）/L 增加到 982.42 ± 6.61 μmol，2,2-二苯基-1-苦基肼（DPPH）自由基抑制率从 46.63 ± 1.39% 增加到 60.87 ± 1.12%。酸水解提高了提取物的铜螯合活性，同时显著降低了亚铁螯合活性和反式阿魏酸浓度（p < 0.05）。TPC 为 100 μmol GAE/L 的酸水解提取物将乳液中己醛积累的滞后期从 0 天延长至 8 天，而 TPC 为 400 μmol GAE/L 的未水解提取物则将滞后期延长至 12 天。结果表明，高浓度的酸水解提取物可能是一种促氧化剂。

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The Journal of the American Oil Chemists’ Society

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