LC-ESI-MS determination of quassinoids isobrucein B and neosergeolide in Picrolemma sprucei stem infusions

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Abstract

Infusions of the stems of Picrolemma sprucei (pseudonym: P. pseudocoffea) are used in the Amazon regions of Peru, Brazil and French Guiana as antimalarials among other uses. They contain the bitter quassinoids isobrucein B (1) and neosergeolide (2) that have important antimalarial and toxic properties among others. In this study, an LC-(+)-ESI-MS/MS method was developed and applied to the determination of 1 and 2 in a common remedy prepared by infusing 1 g of dry, powdered stems of P. sprucei in 1 L of boiling water. Isolated 1 and 2 were used in calibration ranges of 0.25 to 5 µg mL-1 and 0.5 to 10 µg mL-1, respectively, with the internal standard phloroglucinol at 4.0 µg mL-1. Good linearity, precision and accuracy were observed for both compounds. The concentrations of 1 and 2 in the stem infusions were found to be 60.1 and 774 µg L-1, respectively.

Translated abstract

Infusões dos caules de Picrolemma sprucei (pseudônimo: P. pseudocoffea) são principalmente utilizadas como antimaláricos em toda região amazônica. Desta espécie foram isolados os quassinoides isobruceína B e neosergeolida, os quais apresentam atividade antimalárica e citotóxica. Neste estudo, apresentamos o desenvolvimento de uma metodologia analítica por LC-(+)-ESI-MS/MS visando a determinação dos principais quassinoides desta espécie. O método desenvolvido foi empregado para análise de uma formulação artesanal (infusão de 1 g de matéria seca - caules pulverizados de P. sprucei em 1 L de água fervente). Padrões previamente isolados de isobruceína B e neosergeolida foram utilizados para a determinação da linearidade na faixa de calibração entre 0,25 to 5 µg mL-1 e 0,5 a 10 µg mL-1, respectivamente. Como padrão interno foi utilizada a substância fluoroglucinol na concentração de 4,0 µg mL-1. Ambos os compostos apresentaram boa linearidade, precisão e exatidão e as concentrações de isobruceína B e neosergeolida obtidas nas infusões foram de 60,1 e 774 µg L-1, respectivamente.

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Is Open Access

Stability of high-mass molecular libraries: the role of the oligoporphyrin core

Uĝur Sezer, Philipp Schmid, Lukas Felix … (2015)

Molecular beam techniques are a key to many experiments in physical chemistry and quantum optics. In particular, advanced matter-wave experiments with high-mass molecules profit from the availability of slow, neutral and mass-selected molecular beams that are sufficiently stable to remain intact during laser heating and photoionization mass spectrometry. We present experiments on the photostability with molecular libraries of tailored oligoporphyrins with masses up to 25 000 Da. We compare two fluoroalkylsulfanyl-functionalized libraries based on two different molecular cores that offer the same number of anchor points for functionalization but differ in their geometry and electronic properties. A pentaporphyrin core stabilizes a library of chemically well-defined molecules with more than 1600 atoms. They can be neutrally desorbed with velocities as low as 20 m/s and efficiently analyzed in photoionization mass spectrometry. Copyright © 2015 John Wiley & Sons, Ltd.