1. A. Hagerman, Polyphenols Actualit s, 2001, 21, 19.

2. E. Bate-Smith and T. Swain, in Comparative Biochemistry, eds H. Mason and A. Florkin, Academic Press: New York, 1962, Vol. 3, p. 764.

3. E. Haslam, Practical Polyphenolics. From Structure to Molecular Recognition and Physiological Action, Cambridge University Press, Cambridge, 1998.

4. E. Bate-Smith, Food, 1954, 23, 124.

5. E. Haslam and T. H. Lilley, Crit. Rev. Food Sci. Nutr., 1988, 27, 1.

6. J. Gramshaw, J. Inst. Brew., 1967, 73, 455.

7. L. G. Butler, in Plant Polyphenols, eds R. W. Hemingway and P. E. Laks, Plenum Press, New York, 1992, p. 693.

8. C. Santos-Buelga and A. Scalbert, J. Sci. Food Agric., 2000, 80, 1094.

9. L. J. Porter, in The Flavonoids: Advances in Research since 1980, ed. J. B. Harborne, Chapman and Hall, New York, 1988, p. 21.

10. L. J. Porter, in The Flavonoids: Advances in Research since 1986, ed. J. B. Harborne, Chapman and Hall, New York, 1994, p. 23.

11. Z. Czochanska, L. Y. Foo, R. H. Newman, and J. L. Porter, J. Chem. Soc., Perkin Trans. 1, 1980, 2278.

12. L. J. Porter, R. H. Newman, L. Y. Foo, H. Wong and R. W. Hemingway, J. Chem. Soc., Perkin Trans. 1, 1982, 1217.

13. S. Guyot, N. Marnet and J. F. Drilleau, J. Agric.