The main phenolic compounds in pomegranate juice
were identified by their MS fragments and UV spectra
(Table 2). Compound A had a UV spectrum with a
maximum at 278 nm, with a shape similar to that of
gallic acid but with a slight shift in its maximum (Figure
3A). This compound was quite water soluble and was
not adsorbed on the solid-phase extraction cartridges
(RP-18), where it eluted together with all the water
soluble compounds (sugars, organic acids, etc.). Its
HPLC-MS (electrospray) analysis showed a quasi-molecular
ion at 333 m/z (M-H)-, in accordance with
galloyl-glucose, a common constituent of plants containing
hydrolyzable tannins.