Results 41 to 50 of about 2,321 (211)

Actividad antioxidante de los polifenoles de HYPOGYMNIA TAVARESII D. HAWKSW. & P. JAMES

Química Nova, 2016
Lichen substances have more than one phenolic hydroxyl group attached to one or more benzene rings, thus qualifying them as polyphenols. The secondary metabolites isolated from the lichen H.
Elsa M. Rodríguez Pérez, Francisco J. Toledo Marante, Josefa Caballero Hernández, Jaime Bermejo Barrera, Francisco J. Estevez Rosas   +4 more
doaj   +1 more source

Anticancer Potential of Lichens’ Secondary Metabolites

Biomolecules, 2020
Lichens produce different classes of phenolic compounds, including anthraquinones, xanthones, dibenzofuranes, depsides and depsidones. Many of them have revealed effective biological activities such as antioxidant, antiviral, antibiotics, antifungal, and
Zuzana Solárová, Alena Liskova, Marek Samec, Peter Kubatka, Dietrich Büsselberg, Peter Solár   +5 more
doaj   +1 more source

Radical-scavenging Potential of Phenolic Compounds from Brazilian Lichens

Orbital: The Electronic Journal of Chemistry, 2015
Lichens produce a wide range of phenolic substances, mostly depsides and depsidones. As part of our ongoing study of lichens from the Cerrado biome in Mato Grosso do Sul state, the present article reports novel findings on the radical-scavenging ...
Neli Kika Honda, Thiago Inácio Barros Lopes, Rodrigo César da Silva Costa, Roberta Gomes Coelho, Nídia Cristiane Yoshida, Cristiane Regine Vieira Rivarola, Marcelo Pinto Marcelli, Adriano Afonso Spielmann   +7 more
doaj   +3 more sources

Cytotoxic and cytostatic activity of orcinol-type depsides of lichens

Учёные записки Санкт-Петербургского государственного медицинского университета им. Акад. И.П. Павлова
Lichens synthesize unique secondary metabolites, most of which are not found in other living organisms. More than 800 such metabolites are known, which can be found in various parts of the lichen thallus.
I. A. Prokopyev, U. A. Kremenetskaya, O. S. Shemchuk, P. K. Kozhukhov, O. E. Molchanov, D. N. Maistrenko, K. N. Semenov, V. V. Sharoyko   +7 more
doaj   +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

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

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

Redirecting a Fungal Quercetin 2,3‐Dioxygenase Toward Artificial Flavonols

ChemCatChem, Volume 18, Issue 6, 27 March 2026.
A novel quercetin 2,3‐dioxygenase was engineered to reshape its substrate‐binding cavity and redirect its specificity toward artificial flavonols. One variant with a larger substrate‐binding cavity exhibited 20‐ to 1750‐fold higher activity toward bulky flavonols with phenyl‐based substitutions at position C‐8.
Michael Kotik, Natalia Kulik, Stanislav Musil, Petr Halada, Lucie Petrásková, Andrea Ramundo, Tatsiana Charnavets, Martina Hurtová, Vladimír Křen, Kateřina Valentová   +9 more
wiley   +1 more source

Dereplicative Combination of HPLC/DAD/MS and 2D NMR to Identify Lichexanthone Isomers in Lichen Extracts

Phytochemical Analysis, Volume 37, Issue 2, Page 330-343, March 2026.
ABSTRACT Introduction Lichexanthones are the major xanthones found in lichens. They present a high degree of isomerism, which makes their identification tedious. Xanthones are known to occur in lichens according to chemosyndromes, and these compounds act as chemotaxonomic markers.
Solenn Ferron, Marylène Chollet‐Krugler, Hermann Pinson, Rania Marzoug, Philippe Uriac, Françoise Lohézic‐Le Dévéhat   +5 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