Diaz-Ramirez Julen, Basasoro Senda, González Kizkitza, Eceiza Arantxa, Retegi Aloña, Gabilondo Nagore
Materials+Technologies' Group, Engineering School of Gipuzkoa, Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Pza. Europa 1, 20018 Donostia-San Sebastián, Spain.
Antioxidants (Basel). 2023 May 8;12(5):1064. doi: 10.3390/antiox12051064.
Full harnessing of grape pomace (GP) agricultural waste for the preparation of antioxidant Pickering emulsions is presented herein. Bacterial cellulose (BC) and polyphenolic extract (GPPE) were both prepared from GP. Rod-like BC nanocrystals up to 1.5 µm in length and 5-30 nm in width were obtained through enzymatic hydrolysis (EH). The GPPE obtained through ultrasound-assisted hydroalcoholic solvent extraction presented excellent antioxidant properties assessed using DPPH, ABTS and TPC assays. The BCNC-GPPE complex formation improved the colloidal stability of BCNC aqueous dispersions by decreasing the Z potential value up to -35 mV and prolonged the antioxidant half-life of GPPE up to 2.5 times. The antioxidant activity of the complex was demonstrated by the decrease in conjugate diene (CD) formation in olive oil-in-water emulsions, whereas the measured emulsification ratio (ER) and droplet mean size of hexadecane-in-water emulsions confirmed the physical stability improvement in all cases. The synergistic effect between nanocellulose and GPPE resulted in promising novel emulsions with prolonged physical and oxidative stability.
本文介绍了如何充分利用葡萄渣（GP）农业废弃物来制备抗氧化皮克林乳液。细菌纤维素（BC）和多酚提取物（GPPE）均由GP制备而成。通过酶水解（EH）获得了长度达1.5 µm、宽度为5 - 30 nm的棒状BC纳米晶体。通过超声辅助水醇溶剂萃取得到的GPPE，经DPPH、ABTS和TPC测定显示出优异的抗氧化性能。BCNC - GPPE复合物的形成通过将Z电位值降低至 - 35 mV提高了BCNC水分散体的胶体稳定性，并将GPPE的抗氧化半衰期延长了2.5倍。复合物的抗氧化活性通过水包油乳液中共轭二烯（CD）形成的减少得以证明，而水包十六烷乳液的乳化率（ER）和液滴平均尺寸的测量结果证实了在所有情况下物理稳定性均有所提高。纳米纤维素与GPPE之间的协同效应产生了具有延长的物理和氧化稳定性的新型乳液。
