130236-72-5Relevant academic research and scientific papers
Analysis of ethylidene-bridged flavan-3-ols in wine
Drinkine, Jessica,Lopes, Paulo,Kennedy, James A.,Teissedre, Pierre-Louis,Saucier, Cedric
, p. 1109 - 1116 (2007)
A method was developed to determine the amount of ethylidene-bridged flavan-3-ols in wine. The method was based upon the analysis of 2,2 -ethylidenediphloroglucinol (EDP), a product formed after acid-catalyzed cleavage of wine flavan-3-ols in the presence of excess phloroglucinol. In the developed analytical method, the wine was purified and concentrated using C 18 solid-phase extraction before the phloroglucinolysis reaction was carried out. This procedure was used to quantify ethylidene-bridged flavan-3-ols in wine and the molar ratio between ethylidene-bridged linkages and native interflavan linkages. The method validation showed 9.2% repeatability. The recovery of the ethylidenebridged flavanols in wine was 90% for concentrations up to 4.5 mg-L-1 of ethylidene-bridged linkages, and it decreases to 83% above and until the concentration reached 7.6 mg-L-1. Initial results showed that the concentration of ethylidene-bridged flavan-3-ols measured in wines was very low (less than 1.3 mg-L-1) and that they represented less than 1.3% of the total interflavonoid linkages on a molar ratio.
Flavan and xanthen compounds from rearrangement of phloroglucinol polymers
White, Jonathan,Foo, Lai Yeap
, p. 2789 - 2792 (2007/10/02)
Phloroglucinol reacts with acetaldehyde under acid conditions to give rise to insoluble linear polymeric products which subsequently rearrange to flavan and xanthene compounds.
