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URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/11800
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Item Constituintes químicos de Melaleuca alternifolia (Myrtaceae)(Química Nova, 2004-07) Vieira, Tatiana R.; Barbosa, Luiz C. A.; Maltha, Célia R. A.; Paula, Vanderlúcia F.; Nascimento, Evandro A.he first chemical study of non-volatile constituents from the bark and stem of Melaleuca alternifolia (Myrtaceae) led to the isolation and identification of 3,3’-O- dimethylellagic acid (1) and five pentacyclic triterpenes: 2α,3β,23-trihydroxyolean-12-en-28-oic acid (arjunolic acid, 2), 3β- hydroxylup-20(29)-en-27,28-dioic acid (melaleucic acid, 3), betulinic acid (4), betuline (5), 3β-O-acetylurs-12-en-28-oic acid (6), a mixture of fatty acids and esters, and several hydrocarbons. For 2α,3β,23-trihydroxyolean-12-en-28-oic acid (2) and 3β-O- acetylurs-12-en-28-oic acid (6) a first detailed assignment of 1 H NMR is presented.Item Constituintes químicos de Bombacopsis glabra ( bombacaceae)(Química Nova, 2006-03) Paula, Vanderlúcia F.; Cruz, Mariluze P.; Barbosa, Luiz C. de A.The chemical study of the barks of the stem and roots of Bombacopsis glabra (Bombacaceae) led to the isolation and identification of 5-hydroxy-3,7,4'-trimethoxyflavone (1), 5-hydroxy-3,6,7,4'-tetramethoxyflavone (2), the naphtoquinone isohemigossypolone (3), the ester triacontil p-coumarate (4) besides lupeol and a mixture of b-sitosterol and stigmasterol. Their structures were elucidated by spectroscopic analysis, including IR, 1H and 13C NMR and MS. All these compounds, except 3, were isolated for the first time in the family.