depside


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depside

[′dep‚sīd]
(organic chemistry)
One of a class of esters that form from the joining of two or more molecules of phenolic carboxylic acid.
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The depsides (atranorin, diffractaic and lecanoric acids), depsidones (protocetraric, salazinic, hypostictic and norstictic acids), xanthones (lichexanthone and secalonic acid), and usnic acid, as well seven orsellinic acid esters, five salazinic acid 8',9'-0-alkyl derivatives and four lichexanthone derivatives, were evaluated for their activity against Mycobacterium tuberculosis.
a depsidone, aliphatic lactone, depside, dibenzofuran and anthraquinone.
For example, antioxidant activities of several depsides and depsidones isolated from various lichen species (de Paz et al.
More than one hundred secondary metabolites, mainly monoaromatics, depsides, depsidones, pulvinates, dibenzofurans, anthraquinones and xanthones, characteristic of lichen have been detected and isolated (Molnar and Farkas 2010).
Several lichen metabolites of various chemical classes, including the aliphatic acids, depsides and depsidones, dibenzofurans, diterpenes, anthraquinones, naphthoquinones, usnic acids, pulvinic acids, xanthones, and epidithiopiperazinediones have been reported with various biological activities such as cytotoxic, fungicidal, antimicrobial, antioxidant, and anti-inflammatory (Muller 2001).
New depsides from the lichen Neofuscelia depsidella.
subuliformis has been investigated to some extend for chemical constituents, and found to contain two low molecular weight depsides, baeomycesic acid and squamatic acid (Asahina and Shibata 1973; Ingolfsdottir et al.
The active compounds, which have been isolated and identified, belong to the classes of alkaloids (68), triterpenes (29), sesquiterpenes (19), miscellaneous lactones (18), quinoids (16), flavonoids (13), diterpenes (13), steroids (10), lipids (8), iridoids (8), oxygen heterocycles (7), benzenoids (6), carbohydrates (5), lignans (5), proteids (4), coumarins (3), phenylpropanoids (3), depsides (2), a sulfur compound (1), and a monoterpene (1).
depsides and depsidones) that have been poorly investigated for their biological activities (Muller, 2001).