Results 41 to 50 of about 2,517,497 (197)

Curcumin/Usnic Acid-Loaded Electrospun Nanofibers Based on Hyaluronic Acid

, 2020
Hyaluronic acid, curcumin, and usnic acid are separately utilized as effective biological agents in medicine, and materials based on its blend are considered to have wider therapeutic effects than individual ones.
Maria Tyanutova, Svetlana Morozkina, Roman Olekhnovich, Mayya Uspenskaya, Thi Hong Nhung Vu, Petr Snetkov   +5 more
core   +1 more source

Usnic Acid. II. Methylusnic Acid

Chemical and Pharmaceutical Bulletin, 1962
The constitution of methylusnic acid, the methylation product of usnic acid withdimethyl sulfate and sodium hydroxide, first reported by A. Robertson et al. was reinvestigated and elucidated as (I).
Takahashi, Kotaro, Arai, Akie, Oshima, Kazuko, Ueda, Yoshie, Miyashita, Shuichi   +4 more
openaire   +3 more sources

Usnic Acid. IV. Isoanhydromethyldihydrousnic Acid.

Chemical and Pharmaceutical Bulletin, 1963
The structure of isoanhydromethyldihydrousnic acid, one of the products by the acetylation of methyldihydrousnic acid has been shown as being (IIa). The reaction mechanism of the dehydration reaction has been discussed to show that it involes the fission and reformation of -C-O-C- linkage in the furan nucleus and successive Dienone-Phenol rearrangement.
Takahashi, Kotaro, Miyashita, Shuichi, Ueda, Yoshie   +2 more
openaire   +3 more sources

Activity of the Lichen and its Major Metabolites against Gram–positive, Multidrug–resistant Bacteria

Natural Product Communications, 2016
The antimicrobial activity and possible synergistic effects of extracts and compounds isolated from Usnea steineri were evaluated against four resistant bacterial species. A phytochemical study of the acetone extract of U.
Marcos G. Tozatti, Daniele S. Ferreira, Lúzio G. Bocalon Flauzino, Thaís da Silva Moraes, Carlos H. G. Martins, Milton Groppo, Márcio L. Andrade e Silva, Ana H. Januário, Patricia M. Pauletti, Wilson R. Cunha   +9 more
doaj   +1 more source

Improvement of Solubility Usnic Acid Loaded on Mesoporous Silica SBA-15 and Physicochemical Characterization

Science and Technology Indonesia
Usnic acid, a secondary metabolite of lichen Usnea sp., has several pharmacological activities, but it is poorly soluble in water. This study aimed to improve the solubility and dissolution rate of usnic acid loaded in mesoporous silica SBA-15 at a mass
Lili Fitriani, Cindy Maynia Azzahra, Adhitya Jessica, Uswatul Hasanah, Erizal Zaini   +4 more
doaj   +1 more source

Evaluation of Anticancer and Antioxidant Activity of a Commercially Available CO2 Supercritical Extract of Old Man's Beard (Usnea barbata). [PDF]

PLoS ONE, 2016
There is a worldwide ongoing investigation for novel natural constituents with cytotoxic and antioxidant properties. The aim of this study was to investigate chemical profile and stated biological activities of the supercritical CO2 extract (SCE) of old ...
Ana Zugic, Ivica Jeremic, Aleksandra Isakovic, Ivana Arsic, Snezana Savic, Vanja Tadic   +5 more
doaj   +1 more source

Usnic Acid Isolated from Usnea antarctica (Du Rietz) Reduced In Vitro Angiogenesis in VEGF- and bFGF-Stimulated HUVECs and Ex Ovo in Quail Chorioallantoic Membrane (CAM) Assay

Life, 2022
Natural products include a diverse set of compounds of drug discovery that are currently being actively used to target tumor angiogenesis. In the present study, we evaluated the anti-angiogenic activities of secondary metabolite usnic acid isolated from ...
Klaudia Petrová, Miriam Bačkorová, Zuzana Demčišáková, Eva Petrovová, Michal Goga, Mária Vilková, Richard Frenák, Martin Bačkor, Ján Mojžiš, Martin Kello   +9 more
doaj   +1 more source

Microwave-Assisted Semisynthesis and Leishmanicidal Activity of Some Phenolic Constituents from Lichens

Separations, 2023
Leishmaniasis is considered one of the most untreated tropical diseases in the world. In this study, we investigated the in vitro leishmanicidal activity and cytotoxicity of various isolated lichen substances, including atranorin (1), usnic acid (2 ...
Grover Castañeta, Rodrigo Villagomez, Efrain Salamanca, Pamela Canaviri-Paz, José A. Bravo, José L. Vila, Daniela Bárcenas-Pérez, José Cheel, Beatriz Sepúlveda, Alberto Giménez, Carlos Areche   +10 more
doaj   +1 more source

Usnic acid. XVIII. The photolyses of usnic acid and its derivatives. 1.

Chemical and Pharmaceutical Bulletin, 1985
The structures of photolysis products of diacetylusnic acid, usnic acid, isoxazolo [4, 5-b] usnic acid, and isoxazolo [4, 5-a] usnic acid in the presence of nucleophiles were studied and the mechanisms of the photolyses are discussed.
TAKANI, MASAKO, TAKAHASHI, KOTARO
openaire   +2 more sources

Usnic acid potassium salt: an alternative for the control of Biomphalaria glabrata (Say, 1818). [PDF]

PLoS ONE, 2014
In Brazil, the snail Biomphalaria glabrata is the most important vector of schistosomiasis due to its wide geographical distribution, high infection rate and efficient disease transmission.
Mônica C B Martins, Monique C Silva, Luanna R S Silva, Vera L M Lima, Eugênia C Pereira, Emerson P S Falcão, Ana M M A Melo, Nicácio Henrique da Silva   +7 more
doaj   +1 more source