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Objectif : La presente etude est axee sur le dosage spectrophotometrique des composes organiques et phenoliques totaux dans les differents organes de Ampelocissus multistriata. Methodologie et resultats : L’activite antioxydante des extraits a ete evaluee par la methode de FRAP. Le materiel utilise est la matiere seche (MS) des feuilles, tiges, rhizomes, fruits et ecorces. La vitamine C et l’acidite totale ont ete dosees aussi bien dans le jus des fruits frais (MF) que dans les extraits des fruits et feuilles secs par titration. Les resultats y afferents ont montre que les taux de sucres varient  d’un organe a un autre, mais les fruits et les tiges enregistrent les plus fortes teneurs respectivement  75,6% et 71,6% de MS. On observe par ailleurs un taux eleve de vitamine C dans le jus de fruit (4,9% de MF). En plus, les resultats ont montre que tous les organes sont riches en polyphenols totaux mais cela varie d’un organe a un autre. Les tiges et les ecorces sont respectivement les plus riches en polyphenols de l’ordre de 550,74 et 471,4 mg equivalent acide gallique/g de MS. Le faible taux des polyphenols est enregistre dans les racines (216,9 mg equivalent acide gallique/g). Les tiges manifestent une activite antioxydante plus importante (77,93 mg d’equivalent de trolox/g) que les racines (34,54 mg d’equivalent de trolox/g). Les composes phenoliques ont contribue pour plus de 91% dans les activites antioxydantes des extraits. Conclusion et applications des resultats : Cette presente etude revele une richesse en composes glucidiques, en vitamine C et en antioxydants. Ainsi, les  resultats obtenus peuvent s’appliquer dans la recherche de nouveaux remedes antioxydants aussi dans la recherche des additifs ou supplements necessaires dans la conservation des aliments. Mots cles : composes organiques, activite antioxydante, Ampelocissus multistriata. Organic compounds and antioxidant activities of Ampelocissus multistriata of Chad Objective : This study focuses on the spectrophotometric determination of total organic and phenolic compounds in different organs of Ampelocissus multistriata .. Methodology and results : The antioxidant activity of the extracts was evaluated by the FRAP method. The material used l was the dry matter (DM) of the leaves, stems, rhizomes, fruit and peels. Vitamin C and total acidity were measured in both the fresh fruit juices (MF) in the extracts of fruits and dry leaves by titration. The results relating thereto have shown that sugar levels vary from one organ to another, but fruits and stems recorded the highest levels of 75.6% and 71.6% DM, respectively. Moreover, there is a high level of vitamin C in the fruit juice (4.9% MF). In addition, the results showed that all the organs are rich in total polyphenols but this varies from one organ to another. The stems and bark are respectively the richest in polyphenols of around 550.74 and 471.4 mg gallic acid equivalent / g DM. The low rate of polyphenols is stored in the roots (216.9 mg gallic acid equivalent / g). The stems show a higher  antioxidant activity (77.93 mg equivalent of Trolox / g) that the roots (34.54 mg equivalent of Trolox / g). Phenolic compounds have contributed more than 91% in the antioxidant activities of the extracts. Conclusion and application of results : This present study reveals the high glucidic compounds,  vitamin C and antioxidants. So,the results got can apply in the research of antioxidant new cure as in the research of additives or the necessary supplements in the food preserving. Key words : Composed organic, activity antioxidant, Ampelocissus multistriata .

Composes organiques et activités antioxydantes de <i>Ampelocissus multistriata</i> du Tchad