FIGURE 1.

Py-GC/MS chromatograms of the whole cell walls of rice husks (A) and rice straw (B), and of the isolated MWLs from rice husks (C) and rice straw (D). The identities and relative abundances of the released phenolic compounds are listed in Table 2. Letters refer to carbohydrate-derived compounds: (a) (3H)-furan2-one; (b) (2H)-furan-3-one; (c) furfural; (d) 2-hydroxymethylfuran; (e) cyclopenten-1-ene-3,4-dione; (f) 2,3-dihydro-5-methylfuran-2-one; (g) 5-methyl-2-furfuraldehyde; (h) 3-ethyldihydro-2(3H)-furanone; (i) (5H)-furan-2-one; (k) 4-hydroxy-5,6-dihydro-(2H)-pyran-2-one; (m) 2-hydroxy-3-methyl- 2-cyclopenten-1-one; (n) 3-hydroxy-2-methyl-(4H)-pyran-4-one; (o) 5-hydroxymethyl-2-tetrahydrofuraldehyde-3-one; (p) 5-hydroxymethyl-2-furfuraldehyde; (q) levoglucosan.