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Miscellaneous Diterpenes from the Aerial Parts of Plectranthus ornatus Codd

Ávila,Fábio N.; Pinto,Francisco C. L.; Sousa,Thiciana S.; Torres,Maria Conceição M.; Costa-Lotufo,Leticia V.; Rocha,Danilo D.; Vasconcelos,Mayron A. de

Five new diterpenes derivatives named as ornatin A, B, C, D and E, in addition to six known related diterpenes were isolated from the aerial parts of cultivated specimens of Plectranthus ornatus. The structures were elucidated using a combination of 1D/2D nuclear magnetic resonance (NMR) spectroscopy, high-resolution electrospray ionization mass spectrometry (HRESIMS) and comparison with published NMR data of a...

Date: 2017   |   Origin: Oasisbr

Cytotoxic Alkaloids from Hippeastrum solandriflorum Lindl.

Carvalho,Kaline R.; Silva,Alison B.; Torres,Maria Conceição M.; Pinto,Francisco Chagas L.; Guimarães,Larissa A.; Rocha,Danilo D.; Silveira,Edilberto R.

One new alkaloid, 2α-10bα-dihydroxy-9-O-demethylhomolycorine, in addition to seven others known alkaloids, and 5-(hydroxymethyl)furfural, piscidic acid and eucomic acid, were isolated from the bulbs of Hippeastrum solandriflorum. The structures of all compounds were determined using nuclear magnetic resonance (NMR) spectroscopic techniques: 1H NMR and 13C NMR, heteronuclear single quantum coherence (HSQC), hete...

Date: 2015   |   Origin: Oasisbr

Óleos essenciais das folhas de Vernonia Remotiflora e Vernonia Brasiliana: comp...

Maia,Ana Isabel V.; Torres,Maria Conceição M.; Pessoa,Otília Deusdênia L.; Menezes,Jane Eire S. A. de; Costa,Sônia Maria O.; Nogueira,Vanessa Lúcia R.

The chemical composition of the essential oils, obtained by hidrodistillation, from leaves of two Vernonia species (V. remotiflora and V. brasiliana), was determined by GC-FID and GC-MS. Both essential oils were predominantly constituted by sesquiterpenes (92.0 - 93.4%). The main constituents of the oil from V. brasilana were (E)-caryophyllene (36.7%), germacrene D (35.5%), and α-humulene (11.7%), while (E)-car...

Date: 2010   |   Origin: Oasisbr

Despolimerização do poli (tereftalato de etileno) - PET: efeitos de tensoativos...

Di Souza,Luiz; Torres,Maria Conceição M.; Ruvolo Filho,Adhemar C.

A despolimerização do poli (tereftalato de etileno) - PET pós-consumo, em solução aquosa 7,5 mol.L-1 de hidróxido de sódio foi testado a 100 °C e a 1 atm, com objetivo de obter o ácido tereftálico. O efeito de tensoativos e da concentração da solução sobre o rendimento da despolimerização foi estudado quantitativamente via gravimetria e analises térmica. Excesso de solução alcalina aumenta a velocidade de reaçã...

Date: 2008   |   Origin: Oasisbr

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