Conclusion
The isolation and structural elucidation of di- and tri-4-
hydroxyphenylacetic acid derivatives of inositol from T. officinale
demonstrates the usefulness of LC–SPE–NMR for natural product
identification. LC–SPE–NMR was used to isolate five compounds
from fraction 4 and three compounds from fraction 8 respectively.
Further investigation by 1H NMR and HPLC–QTOF-MS/MS revealed
the presence of 5 di-4-hydroxyphenylacetic acid inositol derivatives
(compounds 1–5) from fraction 4 of which compounds 1, 4
and 5 are reported for the first time (Fig. 4). In addition, 3 previously
unreported tri- 4-hydroxyphenylacetic acid inositol derivatives
(compounds 6–8) were characterised from fraction 8 (Fig. 6).