Results 41 to 50 of about 1,182 (166)

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

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

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

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

Functional Traits Mediate Physico‐Chemical Niche Differentiation of Epiphytic Lichens and Bryophytes in Temperate Forests

Journal of Vegetation Science, Volume 37, Issue 2, March/April 2026.
Host tree identity drives bark physico‐chemical filters (e.g., pH, metals) that shape epiphytic communities. We show that species‐specific functional traits, such as lichen substances and bryophyte growth forms, mediate these responses. Lichen metal homeostasis and bryophyte growth habit create distinct species thresholds and community change points ...
Theresa Möller, Stefan Kaufmann, Markus Hauck   +2 more
wiley   +1 more source

Chemo-Diversity and Secondary Metabolite Content in Corticolous Crustose Lichens (Fam. Arthoniaceae, Graphidaceae, Pyrenulaceae) from Remnants of Colombian Tropical Dry Forests

Journal of Fungi
Colombia ranks third among South American countries in terms of fungal diversity (including lichens); however, the lichen diversity of tropical dry forest ecosystems, particularly those in the Caribbean region, remains relatively understudied.
Pierine España-Puccini, Amner Muñoz-Acevedo, Natalia A. Llanos-López, Marc Stadler, Mayar L. Ganoza-Yupanqui, Paula S. Burgos-Zelada, María C. Martínez-Habibe   +6 more
doaj   +1 more source

Antibacterial and Antifungal Activities of Some Phenolic Metabolites Isolated from the Lichenized Ascomycete

Natural Product Communications, 2008
The water-ethanol extract of the lichen Ramalina lacera has been evaluated for its chemical constituents, and for its antibacterial and antifungal properties.
Lumír O Hanuš, Marina Temina, Valery M Dembitsky   +2 more
doaj   +1 more source

Effects of Fumarprotocetraric Acid, a Depsidone from the Lichen Cladonia verticillaris, on Tyrosinase Activity

Orbital: The Electronic Journal of Chemistry, 2017
Lichens are widely distributed around the world. Their phenolic compounds, consisting mainly of depsides and depsidones, have been extensively studied for important biological activities.
Luiz Fabrício Gardini Brandão, Noemia Pereira da Silva Santos, Eugênia Cristina Gonçalves Pereira, Nicácio Henrique da Silva, Maria de Fatima Cepa Matos, Danielle Bogo, Neli Kika Honda   +6 more
doaj   +3 more sources

Phylogenetic Studies and Metabolite Analysis of Sticta Species from Colombia and Chile by Ultra-High Performance Liquid Chromatography-High Resolution-Q-Orbitrap-Mass Spectrometry

Metabolites, 2022
Eleven species of lichens of the genus Sticta, ten of which were collected in Colombia (S. pseudosylvatica S. luteocyphellata S. cf. andina S. cf. hypoglabra, S. cordillerana, S. cf. gyalocarpa S. leucoblepharis, S. parahumboldtii S.
Laura Albornoz, Alfredo Torres-Benítez, Miguel Moreno-Palacios, Mario J. Simirgiotis, Saúl A. Montoya-Serrano, Beatriz Sepulveda, Elena Stashenko, Olimpo García-Beltrán, Carlos Areche   +8 more
doaj   +1 more source

Mass Spectrometry‐Based Applications in Tannin Analytics: From Qualitative and Quantitative Analyses to Biological Activity

Mass Spectrometry Reviews, Volume 45, Issue 1, Page 120-146, January/February 2026.
ABSTRACT Tannins are widespread specialized plant metabolites that contribute significantly to the polyphenol content of plant‐based diets. Their effects on human and animal health vary depending on their structure, with potential benefits including antioxidative, antimicrobial, anthelmintic, and anticarcinogenic properties.
Marica T. Engström, Maarit Karonen
wiley   +1 more source