Insects of the genus Gnathocera, commonly found on the panicles of grasses in the savannas of Togo, were once a valued food resource for local populations. However, this traditional practice is now declining. The present study aims to promote the consumption of these edible insects by evaluating their nutritional potential and their content of trace metal elements (TMEs), in order to contribute to food security in Togo. Three species (Gnathocera flavovirens Kolbe, 1892; Gnathocera hyacinthina (Janssens, 1885); Gnathocera varians Gory & Percheron, 1833) were analyzed. Protein, lipid, fiber, ash, and vitamin contents were determined using standard methods from AOAC and AFNOR, while minerals and TMEs were quantified using atomic absorption spectrophotometry and colorimetry. The results revealed high protein contents (62.30 - 63.60 %) and moderate lipid levels (8.61 - 8.67 %). Dietary fiber ranged from 6.75 to 11.13 %, and ash content from 9.42 to 10.46%. These beetles exhibited high energy density (1432.87 - 1602.41 kJ/100g). They also contain fat-soluble vitamins (retinol and tocopherol), water-soluble vitamins (thiamine, riboflavin, and niacin), as well as essential minerals like zinc, copper, manganese, and iron. The analyzed TMEs were detected at concentrations below regulatory limits, indicating a low risk of human exposure through the consumption of these insects in Togo. These findings highlight the high nutritional value of Gnathocera species and confirm their potential as a sustainable alternative source of protein and micronutrients to enhance food security.

Edible insects, Gnathocera , nutrients,, trace metal elements, Togo

agronomy

Presentation: poster