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Molecules 2015, 20(9), 17194-17207; doi:10.3390/molecules200917194

Influence of Laccase and Tyrosinase on the Antioxidant Capacity of Selected Phenolic Compounds on Human Cell Lines

1
Institute for Molecular Biophysics, Johannes Gutenberg University of Mainz, Jakob-Welder-Weg, 26, 55128 Mainz, Germany
2
Institute for Microbiology and Wine Research, Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg, 15, 55128 Mainz, Germany
3
Department of Pharmacology, Johannes Gutenberg University Medical Center of Mainz, Obere Zahlbacher Str. 67, 55131 Mainz, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 30 June 2015 / Revised: 25 August 2015 / Accepted: 11 September 2015 / Published: 18 September 2015
(This article belongs to the Section Natural Products)
View Full-Text   |   Download PDF [918 KB, uploaded 18 September 2015]   |  

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. View Full-Text
Keywords: polyphenols; tyrosinase; laccase; oxidation; antioxidant activity; DPPH•; cell cultures polyphenols; tyrosinase; laccase; oxidation; antioxidant activity; DPPH•; cell cultures
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Riebel, M.; Sabel, A.; Claus, H.; Fronk, P.; Xia, N.; Li, H.; König, H.; Decker, H. Influence of Laccase and Tyrosinase on the Antioxidant Capacity of Selected Phenolic Compounds on Human Cell Lines. Molecules 2015, 20, 17194-17207.

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