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A series of silicon-accumulating plants [different Equisetum (horse tail) species, Echium vulgare, and Symphytum officinale] were studied by solid-state  29 Si NMR experiments. For this purpose, selected parts of these plants were freeze-dried and then investigated by solid-state  29 Si VACP/MAS NMR spectroscopy. The  29 Si NMR spectra of these plants are quite similar and exhibit the typical pattern characteristic of polysilicic acid (amorphous silica).

Solid-State 29 Si VACP/MAS NMR Studies of Silicon-Accumulating Plants: Structural Characterization of Biosilica Deposits