The Canadian Journal of Physiology and Pharmacology published an article on 11/07 entitled: Survey of Bioactive Compounds in Western Canadian Berries. Berries native to Western Canada were analyzed for total anthocyanins, total phenolics, and trolox equivalentantioxidant activity (TEAC). It found that honeysuckle fruits contained the highest amount of polyphenols.
If you have access to a university or research subscription you can access the article, otherwise you will have to pay to access the article. One of the subscription sites is: http://www.ncbi.nlm.nih.gov/pubmed/18066116, which provides the abstract of the article.
Thanks to Paul @ Battle River Berries - www.haskapberries.com - for the link!