African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Anti-nutritional compounds in fresh and dried lychee fractions (Litchi chinensis Sonn.)

Estela de Rezende Queiroz*
  • Estela de Rezende Queiroz*
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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Celeste Maria Patto de Abreu
  • Celeste Maria Patto de Abreu
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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Denise Alvarenga Rocha
  • Denise Alvarenga Rocha
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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Anderson Assaid Simão
  • Anderson Assaid Simão
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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Valquíria Aparecida Alves Bastos
  • Valquíria Aparecida Alves Bastos
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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Lucimara Nazaré Silva Botelho
  • Lucimara Nazaré Silva Botelho
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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Mariana Aparecida Braga
  • Mariana Aparecida Braga
  • Chemistry Department, Biochemistry Laboratory, Federal University of Lavras ? UFLA, P. O. Box 3037, Zip Code 37200.000, Lavras, MG, Brazil.
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  •  Received: 10 April 2014
  •  Accepted: 22 January 2015
  •  Published: 05 February 2015

Abstract

The present study evaluated the anti-nutritional factors of “Bengal” lychee (Litchi chinensis Sonn.), in the fresh pulp, peel and seed, both fresh and processed. The samples were analyzed for the levels of phenolic compounds, nitrate, oxalic acid and inhibitory activities of trypsin, lipase and α-amylase. Drying influenced the activity of all enzyme inhibitors, resulting in a reduction in the inhibitory activity of lipase (0.13 and 0.15 lipase inhibitor units for peel and seed, respectively) and an increase in the inhibitory activities of trypsin (10.14 and 10.66 trypsin inhibitor units for peel and seed, respectively) and α-amylase (1.13 and 1.08 amylase inhibitor units for peel and seed, respectively). With drying, it was possible to observe an increase in the levels of phenolic compounds, the low content of nitrate did not change with drying, while oxalic acid was not detected. The antinutrients evaluated in lychee fractions are present in amounts that do not preclude its use; thus, the use of lychee fractions, fresh or dried, is feasible as nutrient sources and add value to the fruits, since industries can use these residues for developing new products, as well as in food enrichment.

 

Key words: Phenolic compounds, nitrate, oxalic acid, enzyme inhibitors.