Results 41 to 50 of about 1,590 (200)

New Depsides From Erioderma Lichens

, 1987
A chemosyndrome of para- depsides based on methyl 4-O-demethylbarbatate (3) has been detected in Erioderma lichens and the structures of the metabolites have been established by unambiguous syntheses.
JA Elix, PM Jorgensen, I Mahadevan, L Arvidsson, JH Wardlaw   +4 more
core   +1 more source

Influence of the Solvent on the Extraction of Phenolic Com-pounds from the Coffee Grounds by Soxhlet Leaching

Ingeniería e Investigación, 2022
In this study, phenolic compounds were extracted from the essential oil of coffee grounds originated in the coffee industry in the city of Guayaquil, Ecuador.
Rafael Norberto Calle Chumo, Diego Alejandro Calle Chumo, Aaron Sebastian Gallegos Peredo, Pablo Isaac Jarrin Oseguera   +3 more
doaj   +1 more source

Synthesis of β-orcinol meta-depsides

, 1975
The total syntheses of the lichen depsides, decarboxythamnolic, thamnolic, hypothamnolic and haemathamnolic acid are described.
S Norfolk, JA Elix
core   +1 more source

Methyl 4‐O‐Demethylbarbatate Destabilises HIF‐1α and Enhances Temozolomide Sensitivity in Glioma Cells

Cell Proliferation, EarlyView.
The lichen‐derived metabolite methyl 4‐O‐demethylbarbatate (Me‐4‐O‐DBA) suppresses glioma stemness, motility, and metabolic plasticity through inhibition of HIF‐1α signaling and synergistically enhances temozolomide activity, highlighting a potential strategy to target stemness‐driven therapeutic resistance in glioma.
Rui Zhou, Mücahit Varlı, Rundong Liu, Jieun Yu, Hyung‐Ho Ha, Jae‐Seoun Hur, Sang Kyum Kim, Hahyun Park, Hangun Kim   +8 more
wiley   +1 more source

Caffeic Acid Derivatives from Eupatorium perfoliatum L.

Molecules, 2008
From the ethyl acetate soluble fraction of a methanol/water extract of the herb Eupatorium perfoliatum L. (Asteraceae) six caffeic acid derivatives have been isolated and identified by 1D- and 2D-NMR spectroscopic data.
Andreas Hensel, Frank Petereit, Mareike Maas   +2 more
doaj   +1 more source

The Role of Secondary Metabolites and Bark Chemistry in Shaping Diversity and Abundance of Epiphytic Lichens

Frontiers in Forests and Global Change, 2022
Diversity of secondary lichen metabolites was studied in epiphytic lichens on six phorophytes—spruce, pine, birch, alder, aspen and poplar in the Middle Urals of Russia. Atranorin, usnic, fumarprotocetraric acid, zeorin, and gyrophoric acid were found in
Alexander Paukov, Anzhelika Teptina, Alexander Ermoshin, Ekaterina Kruglova, Lada Shabardina   +4 more
doaj   +1 more source

Synthesis of Lichen para-Sphaerophorol Depsides

, 1987
The total synthesis of the lichen depsides sphaerophorin (I), 4-O-demethylsphaerophorin (2),isosphaeric acid (3), hyperlatolic acid (4) and isohyperlatolic acid (5) is described.
JA Elix, JH Wardlaw
core   +1 more source

Characterization of the depsidone gene cluster reveals etherification, decarboxylation and multiple halogenations as tailoring steps in depsidone assembly

Acta Pharmaceutica Sinica B, 2023
Depsides and depsidones have attracted attention for biosynthetic studies due to their broad biological activities and structural diversity. Previous structure‒activity relationships indicated that triple halogenated depsidones display the best anti ...
Jiafan Yang, Zhenbin Zhou, Yingying Chen, Yongxiang Song, Jianhua Ju   +4 more
doaj   +1 more source

New Depsides From the Lichen Biatora sorediosa

, 1991
The new depsides 2′-O-methylisohyperlatolic acid (4) and 2′-O-methylsuperlatolic acid (5) have been detected in the lichen Biatora sorediosa, and the structure of these metabolites has been established by unambiguous synthesis.
F David, JA Elix
core   +1 more source

The Synthesis of New Meta-Depsides From Ramalina Lichens

, 1986
The total synthesis of the lichen depsides 4′-O-methylnorsekikaic acid (2), 4′-O-methylnorhomosekikaic acid (7), 4′-O- methylnorcryptochlorophaeic acid (8) and 4′-O-methylcryptochlorophaeic acid (9) is reported, and the natural occurrence of these ...
JA Elix, JH Wardlaw
core   +1 more source