lactone

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Related to Lactones: sesquiterpene lactones, Cyclic ester

lactone

 [lak´tōn]
a cyclic organic compound in which the chain is closed by ester formation between a carboxyl and a hydroxyl group in the same molecule.

lac·tone

(lak'tōn),
An intramolecular organic anhydride formed from a hydroxyacid by the loss of water between a hydroxyl and a -COOH group; a cyclic ester.

lac·tone

(lak'tōn)
An intramolecular organic anhydride formed from a hydroxyacid by the loss of water between an -OH and a -COOH group; a cyclic ester.

lac·tone

(lak'tōn)
An intramolecular organic anhydride formed from a hydroxyacid by the loss of water between an -OH and a -COOH group; a cyclic ester.
References in periodicals archive ?
The acidity of honey is due to the presence of organic acids, particularly gluconic acid, in equilibrium with their lactones or esters, and inorganic ions, such as phosphate and chloride.
As mentioned previously lactones are usually metabolised in the liver by the cytochrome P450 system and glutathione plays an essential role in the phase II conversion.
(8,9) Consequently, interaction with this receptor by terpene lactones will affect these events.
New Irganox XP processing stabilizers are combinations of the new lactone processing stabilizer, high-performance phosphites and phenolic antioxidant.
In one study at an occupational dermatology clinic, 4.2% of 346 patients had positive reactions to the Compositae mix, whereas the sesquiterpene lactone mix induced a positive reaction in 0.7% of 1,076 patients (Am.
Bicyclic lactones having a gem-dimethylcyclopropane system have also been obtained as products of cyclization of [gamma], [delta]-epoxyamide in the presence of lithium diisopropylamide [36] or 1,3-cyclization of [beta]-chloroisopropyl-[gamma]-lactones with potassium tert-butoxide [37, 38].
The cis-whisky lactone was found to be the most important contributor to this descriptor, which is in accordance with previous studies.
To determine the effect of tanapsin and tanapsin monoacetate on these proteases, cells were incubated in the presence of these sesquiterpene lactones. Initiator (caspase-9 and -8) and effector caspases (caspase-7, -6, and -3) were determined by Western blot using specific antibodies that bind both the proenzyme and active fragments.
Acyl-homoserine lactones (AHLs) molecules which are responsible for QS activity are synthesized by AHL synthase (LuxI homologue) whereby AHL will bind to its cognate receptor (LuxR homologue) to form a AHL-LuxR complex which in turn modulates a battery of QS-mediated gene expression [3,4].
Among volatile components of wine, lactones and particularly the [gamma]-lactones and whiskey lactones play an important role in terms of their contribution to the aroma.
The new product is effective against strains of parasites resistant to benzimidazoles, levamisole, macrocyclic lactones and combinations of these.