Department of Chemistry, Institute of Chemistry for Renewable Resources, University of Natural Resources and Life Sciences Vienna (BOKU), Konrad-Lorenz-Straße 24, A-3430 Tulln, Austria.
Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Avenida Reina Mercedes, 10, E-41012 Seville, Spain.
Molecules. 2021 Jul 20;26(14):4384. doi: 10.3390/molecules26144384.
Papyri belong to the oldest writing grounds in history. Their conservation is of the highest importance in preserving our cultural heritage, which is best achieved based on an extensive knowledge of the materials' constituents to choose a tailored conservation approach. Thermogravimetric Analysis (TGA) has been widely employed to quantify cellulose and lignin in papyrus sheets, yielding reported lignin contents of 25% to 40%. In this work, the TGA method conventionally used for papyrus samples was repeated and compared to other lignin determination approaches (Klason-lignin and acetyl bromide-soluble lignin). TGA can lead to a large overestimation of the lignin content of commercial papyrus sheets (27%) compared to the other methods (5%). A similar overestimation of the lignin content was found for the pith and rind of the native papyrus plant. We concluded that the TGA method should, therefore, not be used for lignin quantification.
纸莎草纸属于历史上最古老的书写材料。为了保护我们的文化遗产，对其进行妥善保存至关重要，而要实现这一点，最好是在广泛了解材料成分的基础上，选择有针对性的保存方法。热重分析（TGA）已广泛用于定量分析纸莎草纸页中的纤维素和木质素，报告的木质素含量为 25%至 40%。在这项工作中，重复了传统上用于纸莎草纸样本的 TGA 方法，并将其与其他木质素测定方法（Klason 木质素和乙酰溴可溶性木质素）进行了比较。与其他方法（5%）相比，TGA 会导致对商业纸莎草纸页中木质素含量的过高估计（27%）。在原产纸莎草植物的髓心和外皮中也发现了类似的木质素含量过高的情况。因此，我们得出结论，TGA 方法不应用于木质素定量。
