3. Results and discussion
3.1. Chemical characterisation
The FTIR spectrum of cork presented in Fig. 3 is dominated by the presence of absorption bands for hydroxyl (3400 cm
), methylene(2920, 2850 and 1452 cm) and ester (1736, 1240 and 1150 cm) groups. The absorption band at 1508 cm
is associated with the vibration of the aromatic skeleton.
This is consistent with the existence of highly suberized cell walls characteristic of cork.
The spectrum of suberin is similar to that of cork, retaining essentially the absorption bands related to the aliphatic ester moieties.
Therefore, the suberin obtained by extraction probably has its constitutive aliphatic monomers transesterified or in oligomeric blocks arising from incomplete depolymerization.
The lignin spectrum presents an intense band at 3400 cm due to hydroxyl groups, together with a shoulder at around 2570 cm.
This configuration, in combination with the absorption band at 1714 cm, is consistent with the presence of carboxylic acid groups; the relatively intense 1610 and 1505 cm bands are related to the presence of aromatic structures.
In summary, lignin and suberin partially retain the original cork structures.
The aliphatic esterified domain is represented in suberin, whereas the aromatic domain in present in lignin.
3. Results and discussion
3.1. Chemical characterisation
The FTIR spectrum of cork presented in Fig. 3 is dominated by the presence of absorption bands for hydroxyl (3400 cm
), methylene(2920, 2850 and 1452 cm) and ester (1736, 1240 and 1150 cm) groups. The absorption band at 1508 cm
is associated with the vibration of the aromatic skeleton.
This is consistent with the existence of highly suberized cell walls characteristic of cork.
The spectrum of suberin is similar to that of cork, retaining essentially the absorption bands related to the aliphatic ester moieties.
Therefore, the suberin obtained by extraction probably has its constitutive aliphatic monomers transesterified or in oligomeric blocks arising from incomplete depolymerization.
The lignin spectrum presents an intense band at 3400 cm due to hydroxyl groups, together with a shoulder at around 2570 cm.
This configuration, in combination with the absorption band at 1714 cm, is consistent with the presence of carboxylic acid groups; the relatively intense 1610 and 1505 cm bands are related to the presence of aromatic structures.
In summary, lignin and suberin partially retain the original cork structures.
The aliphatic esterified domain is represented in suberin, whereas the aromatic domain in present in lignin.
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