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. 2015 Sep 17;4:499. doi: 10.1186/s40064-015-1250-x

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© Barcena et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — FRAP assay of synthetic anthocyanidin 1 (open triangle), 2 (multiplication sign), and 3 (open circle). Vitamin C (filled diamond) shows higher antioxidant activity under similar conditions. The antioxidants are of the same final concentration (0.15 mM), and the final concentration of Fe³⁺(TPTZ)₂ was 735 mM