Next Article in Journal
Graphite-Supported Perchloric Acid (HClO4-C): An Efficient and Recyclable Heterogeneous Catalyst for the One-Pot Synthesis of Amidoalkyl Naphthols
Previous Article in Journal
Diastereoselective [2+2] Photocycloaddition of Chiral Cyclic Enones with Olefins in Aqueous Media Using Surfactants
Article Menu

Export Article

Open AccessArticle
Molecules 2013, 18(2), 1638-1652;

Use of Pyrogallol Red and Pyranine as Probes to Evaluate Antioxidant Capacities towards Hypochlorite

Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
Departamento de Farmacia, Facultad de Química, Pontificia Universidad Católica de Chile, C.P. 782 0436, Santiago, Chile
Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
Authors to whom correspondence should be addressed.
Received: 13 November 2012 / Revised: 20 December 2012 / Accepted: 14 January 2013 / Published: 28 January 2013
(This article belongs to the Section Natural Products Chemistry)
Full-Text   |   PDF [817 KB, uploaded 18 June 2014]   |  


Hypochlorite is a strong oxidant able to induce deleterious effects in biological systems. The goal of this work was to investigate the use of PGR and PYR as probes in assays aimed at evaluating antioxidant activities towards hypochorite and apply it to plant extracts employed in Chilean folk medicine. The consumption of PGR and PYR was evaluated from the decrease in the visible absorbance and fluorescence intensity, respectively. Total phenolic content was determined by the Folin Ciocalteau assay. PGR and PYR react with hypochlorite with different kinetics, being considerably faster the consumption of PGR. Different stoichiometric values were also determined: 0.7 molecules of PGR and 0.33 molecules of PYR were bleached per each molecule of added hypochlorite. Both probes were protected by antioxidants, but the rate of PGR bleaching was too fast to perform a kinetic analysis. For PYR, the protection took place without changes in its initial consumption rate, suggesting a competition between the dye and the antioxidant for hypochlorite. Plant extracts protected PYR giving a PYR-HOCl index that follows the order: Fuchsia magellanica » Marrubium vulgare » Tagetes minuta > Chenopodium ambrosoides » Satureja montana > Thymus praecox. Based on both the kinetic data and the protection afforded by pure antioxidants, we selected PYR as the best probe. The proposed methodology allows evaluating an antioxidant capacity index of plant extracts related to the reactivity of the samples towards hypochlorite. View Full-Text
Keywords: pyrogallol red; pyranine; hypochlorite; antioxidant activity; plant extracts pyrogallol red; pyranine; hypochlorite; antioxidant activity; plant extracts

Figure 1

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

MDPI and ACS Style

Pérez-Cruz, F.; Cortés, C.; Atala, E.; Bohle, P.; Valenzuela, F.; Olea-Azar, C.; Speisky, H.; Aspée, A.; Lissi, E.; López-Alarcón, C.; Bridi, R. Use of Pyrogallol Red and Pyranine as Probes to Evaluate Antioxidant Capacities towards Hypochlorite. Molecules 2013, 18, 1638-1652.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top