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Table 1 The content of lignin (ABSL, wt%), infrared ratios and crystallinity indices of untreated and biopretreated cellulosic samples after different incubation time

From: Structural evaluation and bioethanol production by simultaneous saccharification and fermentation with biodegraded triploid poplar

Samplea ABSLb FT-IR CrI c CrI d
   LOI (α1437cm-1899cm-1) TCI (α1378cm-12900cm-1)   
C 0 33.4 0.92 1.01 40.7 38.2
C 4 32.5 0.92 1.04 41.7 42.8
C 8 26.6 0.89 0.95 41.3 43.2
C 12 25.1 0.93 1.14 40.4 42.1
C 16 24.6 0.85 1.03 40.6 42.2
  1. aCx represents the cellulosic residues, while the subscript X (4, 8, 12, and 16) represents the different incubation weeks. C0 was obtained without the biodegradation treatment as a control; bABSL is abbreviation of acetyl bromide soluble lignin, and the standard deviations are less than 5%; cCrI was calculated based on the height of the peak corresponding to (002) lattice plane (I002) and the minimum between 110 and 002 lattice planes (Iam) as follow: C r I % = I 002 I am I am × 100 , and the standard deviations are less than 2%; dCrI was calculated from the ratio of the crystalline area over the total area, where separation of crystalline (86–92 ppm) and amorphous (79–86 ppm) fractions were based on Guassian line shape function, and the standard deviations are less than 2%.