Table 6. Sugar-Derived Motifs Identified in the pyr-GC/MS Analysis of A20 Ligninsa.
| content
in samples [%A]b |
||||||||
|---|---|---|---|---|---|---|---|---|
| identified compound | A20-1 | A20-3 | A20-4 | A20-6 | A20-7 | A20-9 | A20-10 | A20-12 |
| furfural | 2.29 | 2.98 | 2.91 | 4.97 | 4.43 | 4.91 | 5.36 | 3.71 |
| 5-HMF | 0.79 | 1.09 | 1.66 | 2.01 | 4.35 | 4.08 | 7.30 | 4.31 |
| furan, 2-(2-propenyl)- | NDc | 1.26 | ND | 1.10 | ND | 1.62 | ND | 1.27 |
| 2-furancarboxaldehyde, 5-methyl- | ND | 0.76 | 0.57 | 0.79 | 1.16 | 1.48 | 1.68 | 0.94 |
| 3-buten-2-one, 4-(2-furanyl)- | ND | 3.99 | ND | 4.09 | ND | 5.46 | ND | 3.80 |
| 1-heptanone, 1-(2-furanyl)- | ND | ND | ND | ND | ND | ND | 0.27 | ND |
| 4,5,6-trimethoxy-7-methyl-3H-2-benzofuran-1-one; | ND | ND | ND | ND | ND | ND | ND | ND |
| benzene, 1,2,3,4-tetramethoxy-5-(2-propenyl)- | ||||||||
| α-d-glucopyranose, 1,6-anhydro | 0.63 | ND | ND | ND | 0.77 | ND | 0.74 | 0.98 |
a
N.B.: Names as Listed in the NIST Database Have Been Used.
b
%area: Corresponding area for a compound relative to the sum of all the signal areas in the chromatogram.
c
ND: indicates that a compound is below the detection limit of %area = 0.5.