Mango consumers only use pulp and consider the kernel as wastes. This study aims to valorize the kernel of mango (Mangifera indica). In this study, the kernel of ten mango varieties (Ruby, Kent, Retard, Key, Assabony, Smith tête de chat, Smith normal, Palmer, Governeur and Aravia) collected at Yamoussoukro in the center of Cote d'Ivoire were used. The oils of these kernels were extracted by maceration method. Their physicochemical properties were determinate using standard methods. The yields of oils extracted are higher than 10%. The acid value of these oils varies from 2.50±0.25 to 27.06±0.35 mg of KOH/g, the saponification value ranges between 164.17±1.30 and 199.21±0.32 mg of KOH/g, iodine value varies from 36.38±0.96 to 54.46±0.54 g of iodine per 100 g of fat and the refractive index ranges between 1.458±0.001 and 1.480±0.002. The water and volatile matter content are varying between 1.08±0.19 and 12.30±0.46%. The study of the lipid composition of these fats showed a significant presence of fatty acid and unsaponifiables. The major fatty acids are palmitic acid (6.77-12.80%), stearic acid (36.36-45.76%), oleic acid (43.20-52.42%) and arachidic acid (0.85-1.65%). The major unsaponifiables are ergosterol (1.94%), sitosterol (78.65%), stigmasterol (10.67%), campesterol (5.33%) and 3-hydroxy-pregn-5-en-20-one (3.39%). The results of the study indicated that mango kernel oils could be used in cosmetics and also in human nutrition for prevention against arteriosclerosis and cardiovascular diseases.

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Les jeunes feuilles non encore ouvertes de Piliostigma thonningii sont expressément utilisées par des tradipraticiens de Côte d’Ivoire pour la prise en charge de diverses pathologies. La présente étude visait à déterminer les teneurs en polyphénols totaux, en flavonoïdes et en tanins condensés d’extraits et de fractions de ces jeunes feuilles non encore ouvertes. Leurs métabolites secondaires ont été extraits par macération dans un mélange éthanol-eau (70/30 : v/v) avec un rendement de 36%. Le fractionnement successif de l’extrait hydroalcoolique obtenu par l’hexane, le dichlorométhane, l’acétate d’éthyle, l’éthanol et l’eau a donné des rendements variant de 5,55 à 33,33%. Le dosage des polyphénols totaux, des flavonoïdes et des tanins condensés a donné des teneurs variant entre 0,23 ± 0,05 et 146,67 ± 4,25 mg EAG/g d’extrait sec, entre 5,33 ± 0,62 et 112,11 ± 0,83 mg EQ/g d’extrait sec et entre 23,33 ± 0,94 et 38,33 ± 0,47 mg EAT/g d’extrait sec respectivement. De façon générale, l’extrait hydroalcoolique et la fraction à l’acétate d’éthyle sont les plus riches en métabolites secondaires, en polyphénols, en flavonoïdes et en tanins condensés.Mots clés : Piliostigma thonningii, rendements, polyphénols totaux, flavonoïdes, tanins.

Reaction of Polycyanocyclopropanes with Amine Hydroiodides.-The reaction of polycyanocyclopropanes with hydroiodides of aromatic or aliphatic amines strongly depends on the substitution pattern of the cyclopropane and amine. Thus, with p-substituted anilines (IV), evolution of dicyanoiodomethane is observed to furnish the N-(1,1-dicyanoalkyl)anilines (IX) or, after subsequent elimination of HCN, the 1,2-dicyanoethenylanilines (V). In contrast, N,N-disubstituted anilines (VI) react at the para-position of the aromatic ring to produce p-aminophenyl derivatives (VII) or (X). Unexpectedly, the tetracyanospiro[5.3]octanedione (XI) reacts by intramolecular recyclization involving one cyano group regardless of the amine used to afford the tetrahydrochromene derivative (XII). -(SIAKA, S.; KAYUKOVA, O. V.; KAYUKOV, YA. S.; LUKIN, P. M.; KHRUSTALEV, V. N.; NESTEROV, V. N.; NASAKIN, O. E.; ANTIPIN, M. YU.; Zh. Org. Khim. 34 (1998) 9, 1330-1336; Chuvashskii gos. univ. im. Ul'yanova, Cheboksary 428015, Russia; RU)