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Phenolic compounds from the rhizome of Renealmia nicolaioides Loes.: a new diarylheptanoid Anais da ABC (AABC)
GEVÚ,KATHLYN V.; CARVALHO,MÁRIO G. DE; SILVA,ILNA G. DA; LIMA,HELENA R.P.; CASTRO,ROSANE N.; CUNHA,MAURA DA.
Abstract: This study aims to identify phenolic compounds in dichloromethane and methanolic extracts of the rhizome of Renealmia nicolaioides collected in the North Region of Brazil. Two known diarylheptanoids, 1,7-bis(4-hydroxyphenyl)-(1E)-1-hepten-3-one (1), and 5R-1,7-bis(4-hydroxyphenyl)-1E-hepten-5-ol (2), and a new one (1R,2S,5S)-2-hydroxy-1,7(p-hydroxyphenyl)-centrolobine (3), as well as one flavonoid, 3-metoxi-quercetin (4) were isolated by chromatographic procedure and identified by spectroscopic techniques (1H and13C NMR, HRMS and CD). The acetyl derivative of 2 was used to confirm its structure. All four compounds are reported for the first time for this genus, and this is the first occurrence of compound 1 as a natural metabolite. The results...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Flavonoid; Alpinieae tribe; Zingiberaceae; Underground organ.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100403
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Special metabolites isolated from Urochloa humidicola (Poaceae) Anais da ABC (AABC)
OLIVEIRA,DÉBORA R. DE; NEPOMUCENO,DELCI D.; CASTRO,ROSANE N.; BRAZ FILHO,RAIMUNDO; CARVALHO,MÁRIO G. DE.
ABSTRACT This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniques. The compounds 4-hydroxy-3-methoxy-benzoic acid, trans-4-hydroxycinnamic acid, and p-hydroxy-benzoic acid; the flavonols isorhamnetin-3-O-β-d-glucopyranoside and methyl quercetin-3-O-β-d-glucuronate; and kaempferitrin, quercetin-3-O-α-l-rhamnopyranoside, and tricin were identified in the extract from the leaves of Urochloa humidicola. Two furostanic saponins, namely, dioscin and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria humidicola; Flavonoids; Steroidal saponins; Urochloa.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300789
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