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polyene

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polyene

 [pol´e-ēn]
1. a chemical compound with a carbon chain of four or more atoms and several conjugated double bonds.
2. any of a group of antibiotic antifungal agents with similar structure, such as amphotericin b, candicidin, or nystatin; they are produced by species of Streptomyces that damage cell membranes by forming complexes with sterols.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

pol·y·ene

(pol'ē-ēn),
A chemical compound having a series of conjugated (alternating) double bonds; for example, the carotenoids.
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References in periodicals archive
Systemic Antifungal Agents in Invasive Fungal Infections That Act on Fungal Cell Membranes: Polyenes and Azoles
Gary-Bobo, "Differences in the interaction of the polyene antibiotic amphotericin B with cholesterol- or ergosterol-containing phospholipid vesicles.
In addition to the polyene index, the ratio of linoleic-to-palmitic fatty acids (i.e., C18:2-to-C16:0) can serve as a reliable indicator of deterioration degree in polyunsaturated fatty acids [31].
Structure-Antifungal Activity Relationships of Polyene Antibiotics of the Amphotericin B Group.
AmB (fungizone), a polyene antifungal, is an amphipathic fermentation product of the Gram-positive bacterium, first isolated from Streptomyces nodosus in 1955.
Natamycin (E 235) is a tetraene polyene macrolide and has amphoteric structure like other macrolides.
MacElroy, "A TD-DFT study of the effects of structural variations on the photochemistry of polyene dyes," Chemical Science, vol.
glabrata strains (9.9%) were likely to be resistant to AMB as follows: five strains exhibited MIC of 2 [micro] g/mL, one strain presented MIC of 4 [micro] g/mL, and three strains exhibited MIC of 8 [micro]g/ml to this polyene agent.
Most of the latter patients received conventional liver-protecting treatment, for instance, polyene phosphatidylcholine, tiopronin.
Amp B a polyene antibiotic is the second line treatment for leishmaniasis, binds specifically to ergosterol, the main sterol present of Leishmania, trypanosome cruzi and fungi [15].
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