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C/O ratio determined on cork phellem and lenticel from XPS analysis (n = 4), and compared to C/O ratio, from literature, of lignin and suberin extracted from cork.
| Cork region or component analysed | C/O ratio | References |
|---|---|---|
| Phellem | 3.79 ± 0.09a | Present work |
| Lenticel | 4.28 ± 0.16b | Present work |
| Suberin | 3.29 | Cordeiro et al.40 |
| Lignin | 4.50 | Pereira et al.17 |
Superscript letters indicate significant difference for C/O ratio between phellem and lenticel (Student test, p < 0.05).
