Biochemical characterization was carried out on five mango varieties grown in Senegal, two of which are intended for export (Kent and Keitt) and three to local consumption, on the one hand, and to national marketing, on the other. It can be seen that the flavanols composition is between "0.74 ± 0.03 mg/100 g" to "4.70 ± 0.33 mg/100 g" and the total polyphenols composition is "265.83 ± 33.70 mg gallic acid/100 g" to "834.29 ± 25.78 mg gallic acid/100 g". This analysis shows that the variety Bk is richer in polyphenols followed by the variety Dr then Knt and finally the lowest proportions are noted with the varieties Kt and SL. The analysis of antioxidant activity shows us percentages ranging from "4.16% ± 2.68% inhibition" to "50.21% ± 3.91% inhibition". It was noted that the SL and Knt varieties give the highest inhibition percentages of "50.21 ± 3.91" and "33.97 ± 0.36" respectively. Variety Bk gives the lowest percentage followed by variety Kt. The Dr variety is the richest in flavonoids "11.75 ± 0.27" followed by the SL variety "11.27 ± 0.10" and the lowest composition is noted in the Knt variety "1.91 ± 0.04". For total sugars, the most important contents are found in the varieties: Bk "12.71 ± 0.32 mg/100 g" followed by Dr "11.5 ± 0.33 mg/100 g" and SL "9.86 ± 0.06 mg/100 g". This time the variety Kt stands out with also important proportions. For quantification, there is a slight difference in the values obtained for the different varieties studied. However, the highest values are observed in local varieties: "0.36 ± 0.06 g/100 g" for Bk and Dr followed by SL "0.31 ± 0.01 g/100 g". The study of the mineral composition shows that the local varieties are the richest and the Knt variety is the poorest. The difference in composition noted within the same variety can be explained by the fact that some varieties have an advanced maturity compared to others.
In this study, the results show that total sugar contents depend on the variety and the position where the fruit (mango) has been harvested. This variation in total sugar contents is observed according to the following varieties: the Bk (Boukodiekhal) variety (bottom position 45 mg/100 mL) then Bk (intermediate and bottom position 40 mg/100 mL) and with the Dr (Diourou) variety the content according to the intermediate position is 63 mg/100 mL while the content according to its bottom position is 56 mg/100 mL. The same is observed for variety Knt (Kent). For the variety factor, we see that the Dr and Sl (Sierra Leone) varieties are the richest in total sugars. Compared to the variation in reducing sugar content, the effect of position is less pronounced. Nevertheless, the statistical results show that the contents vary according to the varieties. There is a very significant variation in reducing sugar content between certain varieties. The variety Kt (Keitt) (45 mg/100 mL) is the richest in reducing sugars but compared to the lower position of the variety Bk, they are statistically identical. Variety Knt remains the poorest in reducing sugars 20 mg/ 100 mL.
This study is carried out on five varieties of mangoes exploited in Senegal (village of Kaguitt), two of which are intended for export and the three for local consumption on the one hand and national marketing on the other. The objectives of this study were to identify the varieties richest in antioxidants and to understand whether the position of the fruit (mango) harvest has an influence on its antioxidant levels. To carry out this study, we used the method developed by (Georgé et al., 2005) for the determination of polyphenols and the method of Adaramola et al. (2016) for evaluation of antioxidant activity. The results on the variation in antioxidant activity, total polyphenols and flavonoids show an influence of variety and position. However, the variation of these contents is difficult to observe at first sight. From statistical analyses, we can see that the position and variety effects are dependent, i.e. that these levels vary according to the two parameters. Compared to the antioxidant activity content, the Sl (top position) and Knt (middle position) varieties are respectively the richest 50%inhibition and 40%inhibition. For the polyphenolic composition this variation according to position has not much effect, however the varieties Dr and Bk remain the richest 0.6 mgeqAc/100g and 0.5 mgeqAc/100g. The results on the flavonoid content show that the Intermediate position of the Dr variety (11 mgeqAc/100g) contains by far the most flavonoids than the other positions of the other varieties. However, its flavonoid content is not statistically significant compared to the Intermediate position of the variety SL. This study reveals that the SL, Dr and Knt varieties can be the basis of an antioxidant-rich diet in Senegal. They can also be used in several food areas.
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