The hygroscopicity and thermodynamic properties of Pinus sylvestris L. wood from a coffin allegedly holding the remains of famous Spanish author Miguel de Cervantes Saavedra (1547–1616) were studied using the 15 °C and 35 °C isotherms fitted to the Guggenheim–Anderson–de Boer model and comparing them with the isotherms of recently felled wood of the same species. In addition, using infrared spectroscopy (FTIR-ATR) and X-ray diffractograms, the functional groups were determined and the crystallinity and organization of the cell wall components were analyzed. The absence of the 1740 cm⁻¹ group indicates hemicellulose degradation in the archaeological wood, and the X-ray diffractograms show a considerable decrease in cellulose crystallinity and disorganization of the cellulose crystallites. The greater availability of active –OH groups means that the archaeological wood isotherms are above the juvenile and mature wood isotherms, and therefore the thermodynamic balance in the sorption of the archaeological wood is greater.

中文翻译：

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降解对木材吸湿性的影响：一个400年历史的棺材案例

使用适合古根海姆-安德森-等温线的15°C和35°C等温线研究了据说藏有西班牙著名作家Miguel de Cervantes Saavedra（1547–1616）遗骸的棺材中樟子松木材的吸湿性和热力学性质。de Boer模型，并将其与最近砍伐的同一树种的等温线进行比较。此外，使用红外光谱（FTIR-ATR）和X射线衍射图确定官能团，并分析细胞壁成分的结晶度和组织。没有1740 cm ^-1X-射线衍射图显示纤维素结晶度显着降低和纤维素微晶的杂乱。活性-OH基团的可用性更高，这意味着考古木材的等温线高于未成年木材和成熟木材的等温线，因此，考古木材吸附中的热力学平衡更大。