Results 201 to 210 of about 52,816 (257)

Lactones in foods

C R C Critical Reviews in Food Science and Nutrition, 1976
Lactones represent another important class of flavor compounds that have been found in a wide variety of foods although traditionally they have been mainly associated with dairy products. This review summarizes their occurrences in foods along with their formation pathways, sensory properties, and isolation, identification, and synthesis techniques ...
Joseph A. Maga, Ira Katz
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Sesquiterpene Lactone Allergy

American Journal of Contact Dermatitis, 1996
Sesquiterpene lactones are a large, diverse group of chemicals found in several plant families that cause allergic contact dermatitis. The biological, botanical, allergenic, and structural significance of sesquiterpene lactones is explored as well as the clinical characteristics of cutaneous reactions.
E M, Warshaw, K A, Zug
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Synthesis of (+)-trans-Whisky Lactone, (-)-cis-Whisky Lactone, (+)-Cognac Lactone and (+)-Eldanolide

HETEROCYCLES, 1993
(+)-trans-Whisky lactone (5) and (-)-cis-whisky lactone (8), (+)-cognac lactone (9) and (+)-eldanolide (10) were synthesized starting from levoglucosenone (1) in optically pure ...
Takashi Ehata, Takashi Ebata, Katsuya Matsumoto, Hajime Yoshikoshi, Koshi Koseki, Hiroshi Kawakami, Koji Okano, Hajime Matsushita   +7 more
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Sesquiterpene Lactones as Allelochemicals

Journal of Natural Products, 2006
Six new sesquiterpene lactones, annuolide H (3), helivypolides F, H-J (4, 11-13), and helieudesmanolide A (6), together with known compounds, were isolated from polar bioactive fractions of Helianthus annuus cv. SH-222 and Stella fresh leaf water extracts.
Macias, Francisco A., Fernandez, Adriana, Varela, Rosa M., Molinillo, Jose M. G., Torres, Ascension, Alves, Pedro L. C. A.   +5 more
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Preparation of lactones via tricarbonyliron–lactone complexes

J. Chem. Soc., Perkin Trans. 1, 1981
A number of tricarbonyliron–lactone complexes have been prepared from vinyl oxirans by treatment with pentacarbonyliron. In certain cases two η3-allyl complexes were isolated from a single vinyl oxiran. Oxidation of the complexes by cerium(IV) ammonium nitrate in acetonitrile leads predominantly to β-lactones.
Gary D. Annis, Steven V. Ley, Christopher R. Self, Ramamoorthy Sivaramakrishnan   +3 more
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Resistance to Macrocyclic Lactones

Current Pharmaceutical Biotechnology, 2012
Resistance to the macrocyclic lactones (MLs) has been confirmed or suspected in many target organisms and is a serious problem in some. For some species, such as parasitic nematodes of small ruminants, ML resistance has become severe enough to threaten effective worm control worm control.
Adrian J, Wolstenholme, Ray M, Kaplan
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Determination of homoserine as the lactone

Analytical Biochemistry, 1970
Abstract An accurate method for the analysis of homoserine has been developed which can be carried out in a reasonable time without requiring elaborate or expensive equipment. Homoserine is converted to the corresponding lactone by evaporation of the sample to dryness from a 3 N hydrochloric acid solution.
E, Voelkert, D R, Grant
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Brominative lactonization in eudesmanes.

Tetrahedron Letters, 1990
Abstract The interaction of ilicic acid 1 with bromine affords directly the bromolactone 3 .
CECCHERELLI, Paolo, CURINI, Massimo, MARCOTULLIO, Maria Carla, ROSATI, Ornelio   +3 more
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Lactones 44. Microbial lactonization of γ-ketoacids

Journal of Molecular Catalysis B: Enzymatic, 2014
Abstract Enantiomerically pure γ-lactones ((+)-4a, (−)-5a, (+)-4b) have been obtained from the corresponding γ-ketoacids (3a and 3b) by their biotransformations with the three fungal strains: Rhodotorula glutinis AM242, Saccharomyces cerevisiae AM464 and Chaetomium sp. KCh6670.
Agnieszka Leśniak, Małgorzata Smuga, Agata Białońska, Józef Kula, Czesław Wawrzeńczyk   +4 more
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β-Lactone formation in a halogeno-lactonization reaction

J. Chem. Soc. D, 1971
The first example of β-lactone formation resulting from halogeno-lactonization of a βγ-unsturated acid is reported.
William E. Barnett, James C. McKenna
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