Lignin in sphagnum and phragmites and in peats derived from these plants

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Scientific paper

The occurrence of phenolic substances in the cell wall of plants is reviewed with particular reference to sphagnum moss. Chemical, ultraviolet and infrared absorption studies of the phenolic component of Sphagnum sp. show that it is distinguished from the lignin of higher plants by its ready liberation in water-soluble form by acid or alkaline hydrolysis, by its low content of guaiacyl and syringyl groups, and by its high content of p -hydroxyphenyl and carbonyl groups. Its acidity does not, however, distinguish it from the lignin of gramineous plants. Infrared spectra and the results of nitrobenzene oxidation show the presence of lignin-derived aromatic rings in the humic acid of phragmites peat. Little-altered lignin can account for 25-40 per cent of the alcohol/benzene-soluble fraction of this humic acid. The same aromatic rings are present in lower concentration in humic acids from sphagnum peats and are derived from the remains of higher plants in these peats, and not from the sphagnum itself.

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