Preparation and Evaluation of Gallate Ester Derivatives Used as Promising Antioxidant and Antibacterial Inhibitors.
Many gallate esters have been applied as food additives due to their good biological properties. Herein, nine novel gallate ester derivatives were synthesized by a Friedel-Crafts alkylation reaction and characterized by melting point (m.p.), infrared (IR) spectroscopy, nuclear magnetic resonance (1 H- and 13 C-NMR) spectra, and high-resolution mass spectrometry (HR-ESI-MS). Their antioxidant and antibacterial activities were measured using a series of classical assays. Studies found that the products showed favorable antioxidant and antibacterial activities. Their 1,1-diphenyl-2-picrylhydrazyl free radical (DPPH⋅ ) scavenging effect IC50 values were less than 5.00 μg mL-1 and their reducing power was not less than that of vitamin C (Vc). Furthermore, the antibacterial results showed that the minimum inhibitory concentration (MIC) values of the products were not greater than 8.00 μg mL-1 , and their antibacterial rates were over 95 % at 300 μg mL-1 . The above data add valuable and novel information that gallate ester derivatives can be considered potential food additives to address food safety issues because of their high biological activity and health benefits.
['Wang|Xuan|X|', 'Li|Cuiping|C|', 'Yun|Fei|F|', 'Jiang|Xiaohui|X|http://orcid.org/0000-0002-8343-3447', 'Yu|Liangmin|L|']
D000900:Anti-Bacterial Agents D000975:Antioxidants D001713:Biphenyl Compounds D004305:Dose-Response Relationship, Drug D004926:Escherichia coli D004952:Esters D005707:Gallic Acid D008826:Microbial Sensitivity Tests D015394:Molecular Structure D010851:Picrates D013211:Staphylococcus aureus D013329:Structure-Activity Relationship
gallate ester food additive antibacterial activity antioxidant activity