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Miniaturized Methodologies for Determining the Total Phenol and Flavonoid Concentrations and the Antioxidant Activity

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Abstract

The present study describes the miniaturization of the conventional methodologies for determining the total phenol and flavonoid concentrations and the antioxidant activities using DPPH, ABTS, and ferric reducing antioxidant power (FRAP) methods. The amount of reagents used was reduced 25, 5.0, 3.6, 3.0, and 3.3 times relative to the conventional methodologies, representing a 67–96% reduction in the analysis costs. The miniaturized and conventional methodologies presented similar linearity in the same concentration range, with the determination and correlation coefficients greater than 0.99. The accuracy of the methodologies was evidenced by the relative standard deviations, which remained below 3%. The 38 samples comprising alcoholic beverages, teas, spices, jams, energy drinks, honey products, and grape derivatives analyzed using the two methodologies (miniaturized and conventional) presented similar average values. Therefore, the miniaturized methodology is proposed as an efficient, safe, and economical alternative to the conventional methods for determining the total phenol and flavonoid concentrations and the antioxidant activities using DPPH, ABTS, and FRAP methods in various matrices.

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Acknowledgments

The authors would like to thank the Universidade Federal de Minas Gerais (UFMG) for the infrastructure provided.

Funding

This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (project number 420637/2016–8 and 308480/2019–8) and the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) (APQ-01429–16).

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Correspondence to Flaviano O. Silvério.

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Ane Patrícia Cacique declares that she has no conflict of interest. Érica Soares Barbosa declares that she has no conflict of interest. Gevany Paulino de Pinho declares that she has no conflict of interest. Flaviano Oliveira Silvério declares that he has no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Cacique, A.P., Barbosa, É.S., de Pinho, G.P. et al. Miniaturized Methodologies for Determining the Total Phenol and Flavonoid Concentrations and the Antioxidant Activity. Food Anal. Methods 14, 1110–1120 (2021). https://doi.org/10.1007/s12161-020-01934-w

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  • DOI: https://doi.org/10.1007/s12161-020-01934-w

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