Evaluation des teneurs en antioxydants et micronutriments des feuilles de onze variétés de Ipomoea batatas à chairs orange et pourpre produites au Burkina Faso.

Chlorophylls a and b, phenolic compounds, carotenoids in total antioxidants from the leaves of eleven varieties of orange and purple sweet potatoes were assessed by spectrophotometry. Using the ABTS method, BF59XCIP1 (43.450 mg ET/g) has the highest antioxidant content ahead of BF59XCIP4, TUSKEGEE-POURPRE CAP VERT and TIB17 (40.969 mg ET/g) and TUSKEGEE-POURPRE (38.161 mg ET/g). The leaves of MOTHER DELIGHT, accumulate much more phenolic compounds (27.37 mg EAG/g) than TIB21 and TIB29 which have an average content of 24.78 mg EAG/g. The lowest levels are observed in TUSKEGEE-POURPRE, BF59XCIP1, TUSKEGEE-POURPRE CAP VERT with an average content of 14.94 mg EAG/g and TUSKEGEE-ORANGE (19.104 mg EAG/g). For Chl b, the extraction solvent accounts for 81.23% of the significant differences observed. Methanol is the best extraction solvent for Chl a (71.93g/100g) and Chl b (56.98g/100g) ahead of the acetone-water system (Chl a 60.81g/100g; Chl b 29.71g/100g). For carotenoids, the extraction solvent (72.5%) has a strong influence in favour of the acetone-water system, which can extract 11,967 g of total carotenoids in 100 g of leaves. [ABSTRACT FROM AUTHOR]