Eight new tropane alkaloids (1-8) were isolated from the bark of "catuaba", a Brazilian endemic plant Erythroxylum vacciniifolium Martius. Their structures were determined by high-resolution mass spectrometry and multidimensional NMR spectroscopy.
The trunk bark and roots of Annona spinescens have been investigated for their alkaloid content. Two new berbine alkaloids, pessoine (1) and spinosine (2), have been isolated from the bark, and their structures were elucidated by spectroscopic methods. Eight known isoquinoline alkaloids were also obtained. The trypanocidal and antileishmanial activities of these isolated compounds have been investigated.
Nine new tropane alkaloids substituted by a methylpyrrole moiety were isolated from the bark of Erythroxylum vacciniifolium, a Brazilian endemic plant used in traditional medicine and locally known as catuaba. All compounds were elucidated as tropanediol or -triol alkaloids esterified by at least one 1-methyl-1H-pyrrole-2-carboxylic acid. One of the isolated compounds was identified as a tropane alkaloid N-oxide. Their structures were determined by high-resolution mass spectrometry and multidimensional NMR spectroscopy.
Objetivou-se avaliar a eficácia do uso de spray de óleo essencial da Eugenia uniflora L. (Pitanga) na descontaminação de escovas dentárias. Foi realizado um ensaio clínico cruzado duplo cego, com uma amostra de 28 universitários entre 19 e 25 anos de idade, de ambos os gêneros, que não utilizavam antibióticos ou anti-sépticos e autorizaram sua participação por meio da assinatura do Termo de Consentimento Livre e Esclarecido. Os participantes usaram três sprays pelo período padronizado de uma semana: spray teste (pitanga a 2%, água destilada e Tween-80), spray controle positivo (clorexidina a 2%) e spray controle negativo (água destilada e Tween-80). A cada semana, foi disponibilizado um “kit” contendo escova dental com capa, creme dental, e um dos três sprays, tendo um intervalo de uma semana entre o uso destes. Avaliou-se o grau de contaminação bacteriana das escovas pelo S. mutans, depois do uso de cada spray por uma semana, sendo semeadas as diluições de 10-3 do soro fisiológico, onde as escovas foram submersas, no meio de cultura Ágar Mitis Salivarius–Bacitracina. Após a semeadura, as placas foram incubadas em estufa a 37ºC por 48 horas emmicroaerofilia e feita a contagem de UFC/mL. As médias de UFC/mL foram: spray teste = 1968,07, controle negativo = 4867,82 e controle positivo = 337,93. Foram observadas diferenças significativas ao nível de 1% (p = 0,01) ao Teste t de Student entre as médias para todos os grupos. Concluiu-se que o spray testado foi eficaz na descontaminação das escovas dentárias.
A new bistetrahydrofuran acetogenin, salzmanin (1), was isolated from the MeOH extract of Annona salzmanii, in addition to the known compounds, squamocin, almunequin, bullatalicin, and annonacin. The structure of 1 was elucidated by spectroscopic methods, including LSIMS-MS technique, and confirmed by a chemical transformation. The cytotoxic activity of 1 and squamocin was investigated.
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