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Specialized Metabolites of the Lichen Vulpicida pinastri Act as Photoprotective Agents
TLDR
Using a new in vitro method designed to overcome the shortage of material associated to many studies dealing with natural products, it is shown that the three major compounds isolated from the lichen Vulpicida pinastri, vulpinic acid, pinastric acid and usnic acid, were UV blocker agents.
A database of high-resolution MS/MS spectra for lichen metabolites
TLDR
An open access MS/MS library with 250 metabolites, coined LDB for Lichen DataBase, providing a comprehensive coverage of lichen chemodiversity, revealing the detection of eleven unique molecules that would have been missed without LDB implementation to the GNPS.
Matrix-Free UV-Laser Desorption Ionization Mass Spectrometry as a Versatile Approach for Accelerating Dereplication Studies on Lichens.
TLDR
It was shown that LDI ionization leads to strong molecular ion formation with little fragmentation, thus, facilitating straightforward spectra interpretation and representing a valuable alternative to time-consuming LC-MS analysis.
In situ DART-MS as a Versatile and Rapid Dereplication Tool in Lichenology: Chemical Fingerprinting of Ophioparma ventosa.
TLDR
In situ DART-MS analyses of Ophioparma ventosa provided an extensive chemical profile and noteworthy pinpointed miriquidic acid, an unusual lichen depside so far unknown within this species, granting a first insight into the distribution of the metabolites within the lichen.
Further terpenoids from Euphorbia tirucalli.
The phytochemical investigation of Euphorbia tirucalli L. (Euphorbiaceae) yielded four new compounds, including a rare cadalene-type sesquiterpene (tirucadalenone), two tirucallane triterpenoids,
Collected mass spectrometry data on monoterpene indole alkaloids from natural product chemistry research
TLDR
A cumulative collection of 172 tandem mass spectrometry (MS/MS) spectra from multiple research projects conducted in eight natural product chemistry laboratories since the 1960s, these data can be used to guide the dereplication and targeting of new related monoterpene indole alkaloids within complex mixtures when applying computer-based approaches, such as molecular networking.
Sulfonic Acid-Containing Flavonoids from the Roots of Phyllanthus acidus.
TLDR
Six new sulfonic acid-containing flavonoids, acidoflavanone, were isolated from the EtOH extract of the roots of Phyllanthus acidus and represent the first examples of sulfonic Acid- containing flavanones, auronols, aurones, and isoflavones.
New erythritol derivatives from the fertile form of Roccella montagnei.
Chemical investigation of the methanol extract of the fertile form of Roccella montagnei collected in Vietnam afforded twelve secondary metabolites, including five new montagnetol derivatives,
The inherent matrix properties of lichen metabolites in matrix-assisted laser desorption ionization time-of-flight mass spectrometry.
TLDR
This proof-of-concept study systematically evaluated the matrix effects of several structural classes of lichen metabolites: monoaromatic compounds, quinone derivatives, dibenzofuran-related molecules and the shikimate-derived vulpinic acid against a wide range of structurally diverse analytes.
Xanthones of Lichen Source: A 2016 Update
TLDR
Besides a comprehensive analysis of the structures of xanthones described in lichens, their bioactivities and the emerging analytical strategies used to pinpoint them within lichens are presented here together with physico-chemical properties as reported since 1996.
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