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Table 4 Segal crystallinity index (CrI), crystal size, degree of polymerization (DP), water retention value (WRV) and direct orange dye adsorption of raw poplar, steam-pretreated poplar and cellulose-rich pulp from the four two-stage pretreatments

From: A comparison of various lignin-extraction methods to enhance the accessibility and ease of enzymatic hydrolysis of the cellulosic component of steam-pretreated poplar

Sample Segal CrI (%) Crystal size (nm) DP WRV (%) Adsorption of direct orange (mg g−1)
Raw poplar 51.5 1.8
SP2 63.7 2.7 622 177 47.6
DES-SP2 65.1 2.9 615 226 71.4
Organosolv-SP2 74.2 3.8 212 262 72.5
Soda/AQ-SP2 68.6 3.5 479 207 81.9
Hydrotrope-SP2 71.0 2.9 523 200 63.6
  1. –, cannot be determined