By Gould R.F. (ed.)
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Extra resources for Extractive and Azeotropic Distillation
Example text
Nishioka, I. 1983, 31, 3906. 34. H. Food Agric. 1958, 9, 212. 35. ; Tanaka, A. Chem. 1964, 28, 64. 36. Haslam, E. Plant Polyphenols - Vegetable Tannins Revisited; Cambridge University Press : Cambridge, 1989. 37. P. Catalysis in Chemistry and Engineering; McGraw-Hill : New York, 1969 ,393. 38. R. Sci. 1984, 9, 145; 1987, 12, 301. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1992. ch002 48 PHENOLIC COMPOUNDS IN FOOD AND THEIR EFFECTS ON HEALTH I 39. ; Hatano, T. 1) 1982, 9.
Many phytochemicals are used as medicine, p e s t i c i d e s , fungicides, pigments, fragrances and f l a v o r compounds. Some of these are phenolic compounds. Phytochemicals are usually extracted from whole plants, usually cultivated. Many of these plants have regional and c l i m a t o l o g i c a l requirements. Consequently, the supply of chemicals from these plants i s susceptible to geographical and c l i m a t o l o g i c a l r e s t r i c t i o n s , and p o l i t i c a l manipulations.
2. HASLAM ET AL. 37 Polyphenol Complexation Rugosin D ( Appendix I ) compared to |M,2,3,4,6-pentagalloyl-D-glucose is simply a reflection of the almost doubling of relative molecular mass ( M R ). In the galloyl-Dglucose series where vicinal galloyl ester groups are constrained by the biosynthetic formation of a hexahydroxydiphenoyl group the loss of conformational freedom is reflected in a reduced capacity to bind to protein ( cf. The apotheosis of this effect is seen in the case of the two unique open chain D-glucose derivatives vescalagin and castalagin - metabolites of Quercus and Castanea species.
