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Food Analytical Methods

, Volume 12, Issue 9, pp 2009–2024 | Cite as

A Box-Behnken Design for Optimal Extraction of Phenolics from Almond By-products

  • Iva Prgomet
  • Berta Gonçalves
  • Raúl Domínguez-PerlesEmail author
  • Núria Pascual-Seva
  • Ana I. R. N. A. Barros
Article

Abstract

Response surface methodology (RSM) was chosen to optimize the influence of solvent pH and relative proportion, and time of extraction, regarding polyphenols and radical scavenging capacity of almond (Prunus dulcis (Mill.) D.A. Webb) by-products (hulls, shells, and skins) from an almond orchard located in the North of Portugal (Lousa, Torre de Moncorvo). The RSM model was developed according to a Box-Behnken design and the optimal conditions were set for pH 6.5, 250.0 min, and 90.0% of food quality ethanol, pH 1.5, 235.0 min, and 63.0% ethanol, and pH 1.5, 250.0 min, and 56.0% ethanol for hulls, shells, and skins, respectively. The optimal conditions were obtained applying spectrophotometric techniques because of their versatility, while the chromatographic profile of extracts obtained when applied the optimal conditions indicated the presence of 3-caffeoylquinic acid, naringenin-7-O-glucoside, kaempferol-3-O-glucoside, isorhamnetin-3-O-rutinoside, isorhamnetin-3-O-glucoside, and isorhamnetin aglycone in hulls and skins. The model designed allowed the optimization of the phenolic extraction from almond by-products, demonstrating the potential of these materials as sources of antioxidant compounds with potential industrial, pharmaceutical, and food applications.

Keywords

Almonds By-products Phenolic extraction Optimization process Antioxidants RSM 

Notes

Acknowledgments

The authors acknowledge João Santos and Chenyao Yang for the help with the climatic data and Alfredo Aires for the help with HPLC data.

Funding

IP received financial support from the FCT-Portuguese Foundation for Science and Technology (SFRH/BD/52539/2014), under the Doctoral Programme “Agricultural Production Chains—from fork to farm” (PD/00122/2012). RDP was supported by a Postdoctoral Contract (Juan de la Cierva de Incorporación ICJI-2015-25373) from the Ministry of Economy, Industry and Competitiveness of Spain. This work is supported by the National Funds by FCT-Portuguese Foundation for Science and Technology, under the project UID/AGR/04033/2019.

Compliance with Ethical Standards

Conflict of Interest

Iva Prgomet declares that she has no conflict of interest. Berta Gonçalves declares that she has no conflict of interest. Raúl Domínguez-Perles declares that he has no conflict of interest. Núria Pascual-Seva declares that she has no conflict of interest. Ana I. R. N. A. Barros declares that she has no conflict of interest.

Ethical Approval

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

Informed Consent

Not applicable.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Iva Prgomet
    • 1
  • Berta Gonçalves
    • 1
  • Raúl Domínguez-Perles
    • 1
    • 2
    Email author
  • Núria Pascual-Seva
    • 3
  • Ana I. R. N. A. Barros
    • 1
  1. 1.Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITABUniversity of Trás-os-Montes e Alto Douro, UTADVila RealPortugal
  2. 2.Centro de Edafología y Biología Aplicada del Segura, Department of Science and Technology of Foods, Group on Quality, Safety, and Bioactivity of Plant FoodsSpanish Council for Scientific Research (CEBAS-CSIC)MurciaSpain
  3. 3.Department of Plant ProductionUniversitat Politècnica de ValènciaValenciaSpain

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