CARACTERÍSTICAS FÍSICO-QUÍMICAS, CAPACIDADE ANTIOXIDANTE E COMPOSTOS FENÓLICOS TOTAIS DE TOMATES FERTIRRIGADOS COM DIFERENTES DOSES DE NITROGÊNIO

Autores

  • Marcos Filgueiras Jorge Science, Technology and Agriculture Innovation Graduate Program, Agronomy Institute, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ.
  • Kamila de Oliveira do Nascimento Food Science and Technology Graduate Program, Technology Institute, Universidade Federal Rural do Rio de Janeiro, Seropédica RJ.
  • José Lucena Barbosa Junior Food Science and Technology Graduate Program, Technology Institute, Universidade Federal Rural do Rio de Janeiro, Seropédica RJ.
  • Leonardo Duarte Batista da Silva Science, Technology and Agriculture Innovation Graduate Program, Agronomy Institute, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ.
  • Maria Ivone Martins Jacintho Barbosa Food Science and Technology Graduate Program, Technology Institute, Universidade Federal Rural do Rio de Janeiro, Seropédica RJ.

DOI:

https://doi.org/10.1590/1983-21252017v30n126rc

Palavras-chave:

Fertirrigação. Composição físico-química. Solanum lycopersicum L..

Resumo

O objetivo deste trabalho foi avaliar a capacidade antioxidante e a qualidade fisicoquímica e microbiológica de tomates cereja orgânicos cultivados com diferentes teores de nitrogênio (%N) utilizando águas residuárias da bovinocultura. As amostras de tomate foram obtidas na Fazendinha Agroecológica (SIPA – Seropédica, RJ) e submetidas a quatro diferentes tratamentos de acordo com os níveis de nitrogênio (T1=0, T2=50, T3=100 e T4=150 %N). Foram determinadas a umidade, teores de cinzas, lipídeos, proteínas e fibras totais. Além do pH, sólidos solúveis (ºBrix), açúcares totais e redutores (%); e acidez titulável (mg de NaOH por 100 g). O teor de compostos fenólicos e a capacidade antioxidante das amostras (DPPH e FRAP) foram avaliadas. Os diferentes %N afetaram o pH e o conteúdo de proteínas e sólidos solúveis totais dos tomates. Elevados teores de nitrogênio forneceram amostras com maiores capacidades antioxidantes (método DPPH) e compostos fenólicos. Em contrapartida, obtiveram-se as menores capacidades antioxidantes segundo o método FRAP nas amostras fertirrigadas com altos teores de nitrogênio. A fertirrigação não influenciou significativamente a qualidade microbiológica das amostras estudadas, que apresentaram contagem de coliformes fecaist <3 NMP/g e ausência de Salmonella em 25 g.

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Publicado

02-12-2016

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Seção

Engenharia de Alimentos