Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Santa Sofia 100, 95123 Catania, Italy; Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria (CREA), Centro di Ricerca Olivicoltura, Frutticoltura e Agrumicoltura, Corso Savoia 190, 95024 Acireale, Italy.
Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Santa Sofia 100, 95123 Catania, Italy.
Food Chem. 2022 Nov 1;393:133428. doi: 10.1016/j.foodchem.2022.133428. Epub 2022 Jun 10.
In the present study, a tangential membrane filtration system was applied to recover phenols from olive mill wastewater. The obtained concentrates were characterised for physico-chemical traits, antioxidant activity and antimicrobial effects. Results indicated that the highest concentration of hydroxytyrosol (7203.7 mg/L) was detected in the concentrate obtained by reverse osmosis, which also showed the highest antioxidant and antimicrobial activity. Moreover, the same concentrate was added, at different ratio, up to 4:250 v/v, into a commercial blood orange juice. The fortified juice with the addition of the concentrate, up to 2:250 v/v ratio, did not show off-flavour and off-odour compared to the control. Furthermore, after 60 days of refrigerated storage, the fortified juice exhibited a hydroxytyrosol content still complying with the daily intake recommended by EFSA health claim. The obtained results can be industrially useful in producing orange juice added with a natural antioxidant concentrate as a 'clean label' ingredient.
在本研究中，采用切向膜过滤系统从橄榄厂废水中回收酚类物质。对获得的浓缩物进行了物理化学特性、抗氧化活性和抗菌效果的表征。结果表明，反渗透得到的浓缩物中羟基酪醇的浓度最高（7203.7mg/L），其抗氧化活性和抗菌活性也最高。此外，将相同的浓缩物以不同的比例（4:250v/v）添加到商业血橙汁中。与对照相比，添加浓缩物至 2:250v/v 比例的强化果汁没有异味和气味。此外，在冷藏储存 60 天后，强化果汁的羟基酪醇含量仍符合 EFSA 健康声称推荐的每日摄入量。研究结果可用于生产添加天然抗氧化浓缩物的橙汁，作为“清洁标签”成分。
