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Chromatogram comparison of bound phenolic acids. a Conventional macroscale extraction. b Improved microscale extraction. Numbers inside the chromatogram denote the different peaks identified. 1. p-coumaric acid, 2. ferulic acid, 3. 8-5 benzofurane, 4. 5-5 diferulic acid, 5. 8-O-4 diferulic acid, 6. 5-5 diferulic acid benzofurane, 7. diferuloyl-cumaroyl putrescine. 8. diferuloylputrescine. Inset square: magnified view of the chromatogram from retention time 7 to 11 min
