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Antioxidant capacity of (+)-catechin visible-light photoirradiated in the presence of vitamin B 2 .
- Source :
-
Redox report : communications in free radical research [Redox Rep] 2017 Nov; Vol. 22 (6), pp. 282-289. Date of Electronic Publication: 2016 Oct 06. - Publication Year :
- 2017
-
Abstract
- Objectives: Catechins are important components of human diet and have received special attention due to their antioxidant capacity. The purpose of this paper was to study the antioxidant action of (+)-catechin (CTQ) in the presence of vitamin B <subscript>2</subscript> (riboflavin) as light-absorbing agent. Furthermore, two model compounds, catechol (CTC) and resorcinol (RSC), were selected in order to elucidate the reactive target of the CTQ molecule. The influence of pH-medium was investigated.<br />Methods: Stationary photolysis, polarographic detection of dissolved oxygen, reactive oxygen species (ROS)-scavengers, time-resolved near-IR phosphorescence detection, stationary, and time-resolved fluorescence and laser flash photolysis techniques were employed.<br />Results: CTQ interacts with riboflavin under visible-light photoirradiation as well as with different ROS which are generated in this mechanism. Radical-scavenging activity increases with increasing of pH-medium.<br />Discussion: pH-effect of the medium on radical-scavenging activity comes from the increased electron-donating ability of CTQ upon deprotonation. These results are very interesting due to the fact that the pH of the food products displays important variations. The [Formula: see text]-scavenging ability of CTQ, would be equal to the additive contribution of each reactive center, CTC, and RSC, present at the molecule of CTQ. However, CTQ would have a moderate ability to removal of [Formula: see text]-species at pH 7.
Details
- Language :
- English
- ISSN :
- 1743-2928
- Volume :
- 22
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Redox report : communications in free radical research
- Publication Type :
- Academic Journal
- Accession number :
- 27712465
- Full Text :
- https://doi.org/10.1080/13510002.2016.1240287