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Fig. 2. Total ion chromatogram (TIC) of lignin breakdown products after tetramethylammonium hydroxide (TMAH) thermochemolysis. Sample: non-Bt maize stem (Prelude). Thermochemolysis: on-line, 500°C, 25% TMAH solution in methanol, capacitive discharge heating (see text). Stationary phase: DB-624 (GC conditions: see text). Peak labels: see Fig. 1 (molecular mass in Dalton in parentheses).