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Chromatograms at 280 nm, 325 nm and 350 nm of phenolic compounds present in the first washing solution of trees different PVPP's (A, B, C). Peak identification: 1. gallic acid; 2. 3,4 dihydroxibenzoic; 3. (+) – catechin; 4. (−) – epicatechin; 5–8 and 11–13 unidentified derivative of procyanidins; 9. derivative of benzoic acid; 14. 2-S-glutathionyl caftaric acid; 15. trans-caftaric acid; 16. coutaric acid; 17. chlorogenic acid; 18. caffeic acid; 19. p-coumaric acid, 20. derivative glycosylated of resveratrol; 21. ferulic acid; 22. resveratrol; 23. caffeic acid ethyl ester; 24. ferulic acid ethyl ester; 25. rutin and 10, 26. unknown.
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