Authors:	Riebel, Matthias Sabel, Andrea Claus, Harald Fronk, Petra Xia, Ning Li, Huige König, Helmut Decker, Heinz
Title:	Influence of laccase and tyrosinase on the antioxidant capacity of selected phenolic compounds on human cell lines
Online publication date:	4-Oct-2022
Year of first publication:	2015
Language:	english
Abstract:	Polyphenolic compounds affect the color, odor and taste of numerous food products of plant origin. In addition to the visual and gustatory properties, they serve as radical scavengers and have antioxidant effects. Polyphenols, especially resveratrol in red wine, have gained increasing scientific and public interest due to their presumptive beneficial impact on human health. Enzymatic oxidation of phenolic compounds takes place under the influence of polyphenol oxidases (PPO), including tyrosinase and laccase. Several studies have demonstrated the radical scavenger effect of plants, food products and individual polyphenols in vitro, but, apart from resveratrol, such impact has not been proved in physiological test systems. Furthermore, only a few data exist on the antioxidant capacities of the enzymatic oxidation products of phenolic compounds generated by PPO. We report here first results about the antioxidant effects of phenolic substances, before and after oxidation by fungal model tyrosinase and laccase. In general, the common chemical 2,2-diphenyl-1-picrylhydrazyl assay and the biological tests using two different types of cell cultures (monocytes and endothelial cells) delivered similar results. The phenols tested showed significant differences with respect to their antioxidant activity in all test systems. Their antioxidant capacities after enzymatic conversion decreased or increased depending on the individual PPO used.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 04 Medizin FB 10 Biologie
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-7801
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Molecules 20 9
Pages or article number:	17194 17207
Publisher:	MDPI
Publisher place:	Basel
Issue date:	2015
ISSN:	1420-3049
Publisher URL:	http://dx.doi.org/10.3390/molecules200917194
Publisher DOI:	10.3390/molecules200917194
Appears in collections:	DFG-OA-Publizieren (2012 - 2017)