Vol 5 No 2 (2018)
Articles

Influence of Agro-Ecological Areas on the Antioxidant Capacity of Onion Varieties Grown in Burkina Faso

Virginie Marie Dakéné
National Laboratory of Public Health; 09 BP 24 Ouagadougou 09; Burkina Faso
Abdoulaye Sérémé
Natural Substances Department / IRSAT / CNRST, 03 BP 7047 Ouagadougou 03; Burkina Faso
Moumouni Koala
Department of Medicine and Traditional Pharmacopoeia / IRSS / CNRST, 03 BP 7047 Ouagadougou 03; Burkina Faso
Marius K. Somda
Department of Biochemistry-Microbiology; University Ouaga I Pr Joseph KI-ZERBO; 03 BP 7021 Burkina Faso
Hagrétou Sawadogo – Lingani
Food Technology Department / IRSAT / CNRST, 03 BP 7047 Ouagadougou 03; Burkina Faso
Alfred S. Traoré
Department of Biochemistry-Microbiology; University Ouaga I Pr Joseph KI-ZERBO; 03 BP 7021 Burkina Faso
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Keywords
  • Agrarian,
  • Cultivation.

Abstract

Colored onion bulb is an important source of antioxidants. Some ecological factors can significantly influence the content and quality of these substances. The aim of the present study is to determine the antioxidant and total polyphenol content of fresh bulbs of five (05) varieties of onion (Galmi Violet, Damani Violet, Prema, Safari and a Local variety-LV) grown in Burkina Faso, and to evaluate also the influence of agro-ecological parameters on the antioxidant content of the most cultivated variety (Galmi violet) of them. Samples of onion bulb for analysis were collected in the six agro-ecological areas of Burkina Faso under the same cultivation conditions. Antioxidant activities were evaluated using the method of Ferric Reducing Antioxidant Power.  The evaluation of the total polyphenol contents was carried out using the Folin-Ciocalteu method. The results showed that antioxidant activities for the 5 varieties tested vary between 0.125 ± 0.001 and 0.149 ± 0.004 mg TE / g, and total polyphenol contents from 0.172 ± 0.011 to 0.272 ± 0.003 mg EAG/g. Results on the assessment of the effect of ecology on the antioxidant content of Galmi violet variety revealed significant variations in antioxidant content from 0.144 ± 0.002 to 0.155 ± 0.001 mg TE / g, and total polyphenols from 0.208 ± 0.014 to 0.292 ± 0.012 mg EAG / g depending on the ecological cultivation area.

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