Berry ellagitannins may not be sufficient for prevention of tumors in the rodent esophagus

Li Shu Wang, Stephen Hecht, Steven Carmella, Claire Seguin, Claudio Rocha, Nanxiong Yu, Kristen Stoner, Steven Chiu, Gary Stoner

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27 Scopus citations


Biodirected fractionation is used to identify the active inhibitory constituents in berries for esophageal cancer in rats. The present study was undertaken to determine if ellagitannins contribute to the chemopreventive activity of an alcohol/water-insoluble (residue) fraction of berries. Rats consumed diets containing residue fractions of three berry types, that is, black raspberries (BRBs), strawberries (STRWs), and blueberries (BBs), that differ in their content of ellagitannins in the order BRB > STRW > BB. Animals were fed residue diets beginning 2 weeks before treatment with the esophageal carcinogen N-nitrosomethylbenzylamine (NMBA) and throughout the 30-week bioassay. Residue fractions from all three berry types were about equally effective in reducing NMBA tumorigenesis in the rat esophagus irrespective of their ellagitannin content (0.01?0.62 g/kg of diet). These results suggest that the ellagitannins may not be responsible for the chemopreventive effects of the alcohol/water-insoluble fraction of berries.

Original languageEnglish (US)
Pages (from-to)3992-3995
Number of pages4
JournalJournal of agricultural and food chemistry
Issue number7
StatePublished - Apr 14 2010


  • Biodirected fractionation
  • Ellagitannins
  • Esophageal cancer
  • N-nitrosomethylbenzylamine


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