Volatile constituents of selected Parmeliaceae lichens

Stojanovic, Igor Z.; Radulović, Niko S.; Mitrović, Tatjana; Stamenković, Slaviša; Stojanović, Gordana

doi:10.2298/jsc101004087s

Cited by 26 publications

(19 citation statements)

References 10 publications

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“…It is well known that hydrolysis of evernin and atranorin produces methyl β-orcinolcarboxylate. 5,24 Orcinol monomethyl ether, which was identified in different amounts in all extracts, could be formed during the decarboxylation of everninic acid. 5 Everninic acid is represented in similar amounts as atraric acid in the diethyl ether extract.…”

Section: Gc-ms Analysismentioning

confidence: 99%

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Contribution to the knowledge of the chemical composition, biological activities and activity concentration of 40K, 137Cs, 226Ra and 232Th of the lichen Evernia prunastri

Stojanović

Zlatanović

Lazarević³

et al. 2018

JSCS

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This study reports the effect of an acetone extract of Evernia prunastri on the micronucleus distribution of human lymphocytes and effect on cholinesterase activity. Furthermore, the antioxidant activity (estimated via DPPH, ABTS, TRP and CUPRAC assays), as well as total phenolic compounds (TPC) and antibacterial activity (against two Gram-positive and three Gram-negative bacteria) were determined. Chemical profiling of four E. prunastri extracts (acetone, diethyl ether, ethyl acetate and dichloromethane) was realized by GC-MS and HPLC analysis. In addition, the activity concentrations of 40 K, 137 Cs, 226 Ra and 232 Th were established.

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Section: Gc-ms Analysismentioning

confidence: 99%

“…5 The GC-MS profile of the acetone-soluble fraction of the methanol extract of E. prunastri revealed the presence of atraric acid (30.1 %) and orcinol (25 %) as the main compounds. 24…”

Section: Gc-ms Analysismentioning

confidence: 99%

Contribution to the knowledge of the chemical composition, biological activities and activity concentration of 40K, 137Cs, 226Ra and 232Th of the lichen Evernia prunastri

Stojanović

Zlatanović

Lazarević³

et al. 2018

JSCS

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“…Lichens may produce several secondary metabolites as adaptive mechanisms for growing in harsh living conditions. Direct gas chromatography (GC)–mass spectroscopy (MS) analysis of a solvent extract is not straightforward because of non-volatile residues, which remain undetected because they are trapped in the chromatographic system (Stojanovic et al, 2011 ). Thus, we propose direct analyses of the samples by analytical pyrolysis (Py-GC/MS), which is defined as the thermochemical decomposition of organic materials at elevated temperatures in the absence of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Cellular Responses of the Lichen Circinaria gyrosa in Mars-Like Conditions

et al. 2018

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Lichens are extremely resistant organisms that colonize harsh climatic areas, some of them defined as “Mars-analog sites.” There still remain many unsolved questions as to how lichens survive under such extreme conditions. Several studies have been performed to test the resistance of various lichen species under space and in simulated Mars-like conditions. The results led to the proposal that Circinaria gyrosa (Lecanoromycetes, Ascomycota) is one of the most durable astrobiological model lichens. However, although C. gyrosa has been exposed to Mars-like environmental conditions while in a latent state, it has not been exposed in its physiologically active mode. We hypothesize that the astrobiological test system “Circinaria gyrosa,” could be able to be physiologically active and to survive under Mars-like conditions in a simulation chamber, based on previous studies performed at dessicated-dormant stage under simulated Mars-like conditions, that showed a complete recover of the PSII activity (Sánchez et al., 2012). Epifluorescence and confocal laser scanning microscopy (CLSM) showed that living algal cells were more abundant in samples exposed to niche conditions, which simulated the conditions in micro-fissures and micro-caves close to the surface that have limited scattered or time-dependent light exposure, than in samples exposed to full UV radiation. The medulla was not structurally affected, suggesting that the niche exposure conditions did not disturb the lichen thalli structure and morphology as revealed by field emission scanning electron microscopy (FESEM). In addition, changes in the lichen thalli chemical composition were determined by analytical pyrolysis. The chromatograms resulting from analytical pyrolysis at 500°C revealed that lichen samples exposed to niche conditions and full UV radiation consisted primarily of glycosidic compounds, lipids, and sterols, which are typical constituents of the cell walls. However, specific differences could be detected and used as markers of the UV-induced damage to the lichen membranes. Based on its viability responses after rehydration, our study shows that the test lichen survived the 30-day incubation in the Mars chamber particularly under niche conditions. However, the photobiont was not able to photosynthesize under the Mars-like conditions, which indicates that the surface of Mars is not a habitable place for C. gyrosa.

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“…Large relative amounts of atraric acid and orcinol were previously detected in Evernia prunastri (L.) Ach. and/or Parmelia sulcata Taylor (up to 30% of the GC-MS analyzable fraction of the studied samples) (Stojanović, 2011). Atraric acid is also represented in the high shares (12.1 -47.7 %) in the extracts of Platismatia glauca and Pseudevernia furfuracea (Mitrović et al, 2014).…”

Section: Resultsmentioning

confidence: 93%

GC-MS analysis of Ramalina capitata (Ach.) Nyl. extract

Zrnzević

Zlatanović

Lazarević

et al. 2015

Facta Univ Phys Chem Technol

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This is the first report on the GC-MS profile of the ether-soluble fraction (ESF) of the methanol extract of the lichen Ramalina capitata (Ach.) Nyl. (Ramalinaceae). The profile was dominated by orcinol (22.9 %) and its monomethyl ether (30.9 %), which accounted for more than a half of the GC-MS analyzable fraction of ESF. Significantly lower amounts of structurally related sparassol (5.8%) and atraric acid (0.9 %) were also detected. Additionally, ESF contained methyl linoleate, methyl linolenate and methyl palmitate (17.3 %, 7.3 % and 5.0 %, respectively).

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Volatile constituents of selected Parmeliaceae lichens

Cited by 26 publications

References 10 publications

Contribution to the knowledge of the chemical composition, biological activities and activity concentration of 40K, 137Cs, 226Ra and 232Th of the lichen Evernia prunastri

Contribution to the knowledge of the chemical composition, biological activities and activity concentration of 40K, 137Cs, 226Ra and 232Th of the lichen Evernia prunastri

Cellular Responses of the Lichen Circinaria gyrosa in Mars-Like Conditions

GC-MS analysis of Ramalina capitata (Ach.) Nyl. extract

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