Fig.: Chromatographic analysis: A, RP-HPLC chromatograms of authentic standards of different phenolic compounds. Peak identity: 1. 4-Hydroxybenzoic acid, 2.vanillic acid, 3.vanillin, 4. 4-hydroxybenzaldehyde, 5.4-coumaric acid, 6. trans-ferulic acid; B, RP-HPLC chromatograms of cell-wall bound fractions. Peak identity: 1. 4-hydroxybenzoic acid, 2. 4- coumaric acid, 3.ferulic acid. UV spectra are shown in inset. The unidentified peak is denoted by ‘*’.