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https://hdl.handle.net/2440/55910
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Type: | Journal article |
Title: | Precursors to damascenone: Synthesis and hydrolysis of isomeric 3,9-dihydroxymegastigma-4,6,7-trienes |
Author: | Puglisi, C. Daniel, M. Capone, D. Elsey, G. Prager, R. Sefton, M. |
Citation: | Journal of Agricultural and Food Chemistry, 2005; 53(12):4895-4900 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2005 |
ISSN: | 0021-8561 1520-5118 |
Statement of Responsibility: | Carolyn J. Puglisi, Merran A. Daniel, Dimitra L. Capone, Gordon M. Elsey, Rolf H. Prager, and Mark A. Sefton |
Abstract: | A series of four isomeric 3,9-dihydroxymegastigma-4,6,7-trienes, 8, has been prepared. The (3S,6R,9S) isomer of 8 proved to be identical to an isomer of this compound tentatively identified as an intermediate in the formation of damascenone from an allene triol. Each of the four isomers, when hydrolyzed independently of each other at pH 3.0 and 25 °C, produced product mixtures in which the major product was damascenone (1). Contrary to expectation, 3-hydroxydamascone (5) was not observed in any of the hydrolyses. Consequently, the mechanism of formation of damascenone proposed earlier requires modification. In each hydrolysis, the product mixtures showed the presence of a second isomer of 8, produced by epimerization during hydrolysis. Chiral analysis on a Cyclosil B column revealed that this epimerization was occurring at C3 in each of the hydrolyses. |
Keywords: | Damascenone flavor precursors wine carotenoid metabolites epimerization acid hydrolysis |
DOI: | 10.1021/jf050327p |
Published version: | http://dx.doi.org/10.1021/jf050327p |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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