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Table 3 Lignin and carbohydrate composition of each fraction

From: Precipitate obtained following membrane separation of hydrothermally pretreated rice straw liquid revealed by 2D NMR to have high lignin content

  Fraction No. Acid-insoluble lignin % Soluble lignin % Glucan % Xylan % Ash % Others %
Rice straw 1 19.5 6.5 31.9 12.8 10.0 19.3
Solid fraction 2 17.2 2.5 53.6 1.1 16.5 9.1
Brown precipitate 3 29.4 8.7 13.2 13.5 4.4 30.8
Supernatant 4 17.3 9.6 8.1 19.4 0.0 45.5
NF concentrate 5 17.0 11.2 9.6 24.6 0.0 37.6
Black precipitate 6 52.9 12.9 4.0 11.9 0.1 18.3
UF concentrate 7 24.5 16.7 5.6 29.0 0.0 24.2