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Plant Foods for Human Nutrition

, Volume 67, Issue 3, pp 262–270 | Cite as

Stability of Carotenoids, Total Phenolics and In Vitro Antioxidant Capacity in the Thermal Processing of Orange-Fleshed Sweet Potato (Ipomoea batatas Lam.) Cultivars Grown in Brazil

  • Carlos M. Donado-Pestana
  • Jocelem Mastrodi Salgado
  • Alessandro de Oliveira Rios
  • Priscila Robertina dos Santos
  • André Jablonski
Original Paper

Abstract

Intervention strategies regarding the biofortification of orange-fleshed sweet potato, which is a rich source of carotenoids for combating vitamin A deficiency, are being developed in Brazil. This study was conducted to evaluate the concentrations of individual carotenoids, total phenolic compounds and antioxidant capacity in the roots of four biofortified sweet potato cultivars that were raw or processed by four common heat treatments. HPLC, Folin-Ciocalteu, DPPH and ABTS assays were used. All cultivars showed high levels of carotenoids in raw roots, predominantly all-trans-β-carotene (79.1–128.5 mg.100 g−1 DW), suggesting a high estimated vitamin A activity. The CNPH 1194 cultivar reported carotenoids values highest than those of other cultivars (p < 0.05). The total phenolic compounds varied among cultivars and heat treatments (0.96–2.05 mg.g−1 DW). In most cases, the heat treatments resulted in a significant decrease in the carotenoids and phenolic compounds contents as well as antioxidant capacity. Processing of flour presented the greatest losses of major carotenoids and phenolics. The phenolic compounds showed more stability than carotenoids after processing. There were significant correlations between the carotenoids and phenolic compounds and the antioxidant capacity.

Keywords

Bioactivity Biofortification Functional food Heat treatment Sweet potato 

Abbreviations

ABTS

2,2′-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid)

DPPH

2,2-diphenyl-1-picrazylhydrazyl

EMBRAPA

Brazilian Agricultural Research Corporation

HPLC

high performance liquid chromatography

MTBE

tert-methyl-butyl-ether

OFSP

orange-fleshed sweet potato

Notes

Acknowledgments

The authors thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and the Fundação de Estudos Agrários “Luiz de Queiroz” (FEALQ) for the graduate scholarship for the first author. The authors also thank EMBRAPA, especially Dr. Werito Melo, for donating the sweet potato cultivars used in this study.

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Copyright information

© Springer Science+Business Media, Inc. 2012

Authors and Affiliations

  • Carlos M. Donado-Pestana
    • 1
  • Jocelem Mastrodi Salgado
    • 1
  • Alessandro de Oliveira Rios
    • 2
  • Priscila Robertina dos Santos
    • 1
  • André Jablonski
    • 3
  1. 1.Departamento de Agroindústria, Alimentos e Nutrição, Escola Superior de Agricultura “Luiz de Queiroz”Universidade de São PauloPiracicabaBrazil
  2. 2.Instituto de Ciência e Tecnologia de AlimentosUniversidade Federal do Rio Grande do SulPorto AlegreBrazil
  3. 3.Departamento de Engenharia de MinasUniversidade Federal do Rio Grande do SulPorto AlegreBrazil

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