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DOI: 10.1055/a-1315-0666
Molecular Networking Discloses the Chemical Diversity of Flavonoids and Selaginellins in Selaginella convoluta
Supported by: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Finance Code 001Supported by: Conselho Nacional de Desenvolvimento Científico e Tecnológico CNPq [445149/2014-0]
Supported by: Conselho Nacional de Desenvolvimento Científico e Tecnológico CNPq/INCTBioNat [465637/2014-0]
Supported by: Fundação de Amparo à Pesquisa do Estado de São Paulo #2017/19702-6
Supported by: Fundação de Amparo à Pesquisa do Estado de São Paulo #2019/08477-7
Supported by: Fundação de Amparo à Pesquisa do Estado de São Paulo FAPESP - INCTBioNat 2014/50926-0


Abstract
Selaginella convoluta is a desiccation tolerant plant native to the Brazilian semiarid region (Caatinga), endowed with an effective drought resistance mechanism. As part of our research efforts to understand the chemical diversity of S. convoluta, dehydrated (harvested in their natural habitat in the dry season) and hydrated (plant acclimated in a laboratory after rehydration) specimens were analyzed by HR-LC-ESI-MS/MS followed by a structural annotation on the Global Natural Products Social Molecular Networking Web platform. The molecular networking approach allowed for putative annotation of 39 metabolites, mainly selaginellins and flavonoids. Based on MS/MS data, three unprecedented selaginellins were annotated: 29-hydroxy selaginellin O, 29-hydroxy selaginellin A, and 4-{[2-(4-hydrophenyl)-6-[2-(4-hydroxyphenyl)ethynyl]phenyl](4-oxocyclohexa-2,5-dien-1-ylidene)methyl}benzaldehyde. Th results pointed out that valuable scientific knowledge can be obtained from studies conducted with plants in their natural habitat by allowing a more realistic profile of chemical diversity. The present study adds new information on specialized metabolites of S. convoluta, mainly flavonoids and selaginellins, and highlights the species as an untapped source of chemobiodiversity from Caatinga.
Supporting Information
- Supporting Information
Base peak chromatogram in positive and negative electrospray ionization modes of the methanol extract of shoots and S. convoluta at different hydration states (Fig. 1S), representation of all MN (Fig. 2S), representation of MN after blank removal showing O-glycosyl metabolite clusters (Fig. 3S), the general structure of selaginellins (Fig. 4S), proposal of fragmentation of original selaginellins (Fig. S5), proposal of fragmentation of the annotated selaginellins (Fig. 6S), the MS/MS spectral of the O-glycosyl metabolite cluster (Fig. 7S), and the MS/MS spectral of phenolic derivatives (Fig. 8S) are available as Supporting Information.
Publication History
Received: 30 April 2020
Accepted after revision: 11 November 2020
Article published online:
09 December 2020
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