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.

lactone

/lac·tone/ (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 an -OH and a -COOH group; a cyclic ester.

lactone (lakˑ·tōn),

n a compound with a high molecular mass that comprises an ester linked to a ring structure of carbon atoms. Significant members of this group are coumarin and its derivatives. It is found in expressed oils and some absolutes. It has been used as an anticoagulant, sedative, and antipyretic. Harmful effects include skin allergies and potential toxicity to the nervous system.

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.

lactone,

n an organic anhydride formed from a hyroxyacid by the loss of water between an 2OH and a 2COOH group.

lactone

1. an aromatic liquid from lactic acid.
2. a cyclic organic compound in which the chain is closed by ester formation between a carboxyl and a hydroxyl group in the same molecule.
References in periodicals archive ?
Here we studied germacranolide sesquiterpene lactones that interfere with NPM/ALK expression to decide about the feasibility of the development of a new drug from the isolated leads.
The biological activities of Tanacetum parthenium could be attributed to the leaves and flowers mainly due to the presence of sesquiterpene lactones and flavonoids, whenever the roots showed no biological activities due to the absence of sesquiterpene lactones and flavonoids [12].
The active constituents (secondary metabolites) are the fat soluble kava lactones (kavapyrones), and the main compounds are methysticin, dihydromethisticin, kavain, dihydrokavain and desmethoxyangonin and flavonoids (flavokavains) (Braun 2007).
The standard extract is isolated from the dried leaves of the dioecious Ginkgo biloba tree and contains a wide variety of phytochemicals, amongst which flavonoids and terpene lactones are considered to be bioactive constituents.
The drug contains sesquiterpene lactones that are quite uncommon in medicinal plants (Lyss et al.
After a brief introduction to the discipline, contributors offer 12 papers describing their advanced research in biofilms, including the biofilm mode of life, the initial transition to a surface lifestyle by pseudomonada, the biofilm matrix, cyclic di-GMP as an intracellular signal regulating bacterial biofilm formation, N-acylhomoserine lactones and their relationship with quorum sensing and biofilm development in gram-negative bacteria, signaling in e-coli biofilms, peptide signaling, differentiation and dispersal in biofilms, human oral multi-species biofilms and their bacterial communities in health and disease, biofilms as refuges against predation, biofilms on plant surfaces and bacterial biofilms on fungal surfaces.
Of the total 159 mg of crude product 106 mg was purified on silica gel and 62 mg (58%) of hydroxylated lactones 4, as a mixture of diastereo- and regioisomers (according to NMR analysis, the ratio of the regioisomers was in favour of 6-hydroxylated lactone ~3:1), along with 8 mg (7%) reduced derivative 5 was isolated.
Broadly FDA-approved with low migration, it synergizes with sulfur and phenolic antioxidants and lactones and is not deactivated by fillers such as talc.
The primary active principles in ginkgo are flavone glycosides and the terpene lactones bilobalide and certain ginkgolides, particularly ginkgolide B.
The distillate contains high levels of fruity esters and lactones, plus spicy terpenes, underplayed with several sugary/caramel-like furanones.
Bioassay-directed chemical analysis of ambient samples and environmental chamber reactions of PAHs led to the identification of mutagenic nitrophenanthrene lactones (Helmig et al.