Title: Concentration and Mean Degree of Polymerization of Rubus Ellagitannins Evaluated by Optimized Acid Methanolysis
Authors: VRHOVSEK UrskaPALCHETTI AriannaRENIERO FABIANOGUILLOU CLAUDEMASUERO DomenicoMATTIVI Fulvio
Citation: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY vol. 54 no. 12 p. 4469-4474
Publisher: AMER CHEMICAL SOC
Publication Year: 2006
JRC Publication N°: JRC36244
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC36244
Type: Articles in Journals
Abstract: Ellagitannins are a major class of phenolics largely responsible for the astringent and antioxidant properties of raspberries and blackberries. The Rubus ellagitannins constitute a complex mixture of monomeric and oligomeric tannins. Rubus oligomeric ellagitannins contain, beside the well-known ellagic acid and gallic acid moieties, the sanguisorboyl linking ester group. When exposed to acids or bases, ester bonds are hydrolyzed and the hexahydroxydiphenic acid spontaneously cyclizes into ellagic acid. This study describes a new, rapid procedure for the acid hydrolysis of Rubus ellagitannins in methanol, which results in maximal yield and enables the quantification of all the major reaction products. Additionally, the method provides the rationale for estimating the mean degree of polymerization of Rubus ellagitannins.
JRC Institute:Institute for Health and Consumer Protection

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