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La caracterisation biochimique de 11 cultivars de bissap a ete menee afin de comparer leurs teneurs en elements nutritifs et de determiner la meilleure periode de recolte des feuilles. Les plants ont ete produits au Centre pour le Developpement de l’Horticulture (CDH) suivant les recommandations du guide de production du bissap de l’Institut Senegalais de Recherches Agricoles (ISRA). Des echantillons de 100 g de feuilles fraiches ont ete preleves au hasard sur des plantes de chacun de ces cultivars. Ces prelevements ont ete effectues a quatre (4) dates durant le cycle de developpement vegetatif. Les analyses biochimiques ont ete faites a l’Institut de Technologie Alimentaire (ITA) selon les methodes AOAC. La teneur moyenne en elements nutritifs des feuilles a ete comparee a celle du chou, mais egalement evaluee a differentes dates durant le cycle de developpement vegetatif des plantes. Les resultats montrent que les feuilles de bissap sont riches en elements nutritifs. Une difference existe entre le type rouge et le type vert. Bien que les feuilles du type vert soient les plus consommees, le type rouge a une teneur plus elevee en acidite, vitamine C, calcium et phosphore, alors que, la teneur des autres elements chimiques (proteines, matieres grasses, cendres, cellulose, fer et valeur energetique) est sensiblement la meme. Les feuilles de bissap montrent une teneur plus elevee en proteines, vitamine C, fer et calcium que le chou. La date optimale de recolte pour beneficier de plus de fer, proteines et acidite se situe a 97 jours apres semis. © 2017 International Formulae Group. All rights reserved. Mots cles: Cultivars, bissap, periode optimale de recolte, elements nutritifs, Senegal English Title: Using biochemical parameters to identify the recommended optimal harvest time of Roselle’s ( Hibiscus sabdariffa L.) leaves in Senegal English Abstract Biochemical characterization of 11 cultivars of Roselle was conducted to compare content of micronutrients and determinate the recommended optimal harvest time of leaves to maximize on the nutrients.  Plants were grown at the research station of Center for Horticulture Development (CDH) following the technical guideline of Senegalese Research Institute for Agriculture (ISRA). A sample of 100 g was collected at random on plants of each cultivar. Sampling was done at 4 dates during whole cycle of plant growth. The biochemical analysis was done by Food Technology Institute (ITA) in Senegal, using AOAC methods. The average nutrients content of Roselle leaves was compared with cabbage content. Our results show that Roselle leaves content more nutrient than cabbage. Roselle green type and red type show difference in nutrient content. Even though the green type is commonly consumed, the red type is richer in acidity, vitamin C, calcium and phosphorus. However, nutrient content of proteins, fat, ash, celluloses, iron and energy are similar. Roselle leaves show high nutrient content in proteins, vitamin C, iron and calcium than cabbage. The best date to harvest leaves for high level of iron, proteins and acidity is 97 days after sowing. © 2017 International Formulae Group. All rights reserved. Keywords: Cultivars, roselle, best harvesting period, nutrient content, Senegal

international journal of biological and chemical sciences

Utilisation des paramètres biochimiques pour la détermination de la date optimale de récolte des feuilles de bissap (&lt;i&gt;Hibiscus sabdariffa&lt;/i&gt; L.) au Sénégal