Exact(5)
The lignin value of the hull is less than 50% of that of wood [27, 28].
The total lignin value is 12.5% of which acid-soluble lignin (ASL) accounts for 0.8% only.
The presence of extractives may result in too high a lignin value.
The pseudo-lignin can be broadly defined as an aromatic material that yields a positive Klason lignin value.
Acid-catalyzed dehydration of carbohydrates is responsible for formation of pseudo-lignin, an aromatic material with positive Klason lignin value that is derived from carbohydrates rather than from native lignin [ 23- 27].
Similar(55)
Lignin values reported here are for acid-insoluble Klason lignin only.
Xylose and lignin values vary considerably also (18 to 24% and 14 to25%% w/w DM respectively).
This was likely due to the precipitation of extractives with the lignin during steam pretreatment leading to higher lignin values being measured.
In a second alfalfa study, C4H down-regulated plants not only displayed lower lignin values, but also demonstrated reduced S/G ratios [ 27].
Sugar and lignin values from untreated samples (i.e. fresh biomass) of Douglas-fir Woodchips were in good agreement with previously published studies [ 17, 18].
As the extractive values were determined from a separate analysis, the "double counting" of extractives from both the "overestimated lignin" values and extractive values themselves likely resulted in the observed, slightly higher summative mass closure.
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