Abstract In analytical pyrolysis, carbohydrates are degraded into stable anhydrosugars, which are analyzed by GC/MS. The benefit of Py-GC/MS is that fiber composition including carbohydrates, lignin and its S/G ratio can be determined simultaneously from fiber-based materials without need of extensive pretreatment, contrary to the traditional method. In this study, the relative carbohydrate composition of various Eucalyptus species was determined by Py-GC/MS. In addition, pulps produced from the same species by soda-AQ and soda-O 2 processes were analyzed similarly. The results were compared with those obtained by acid hydrolysis followed by HPLC. This comparison showed that the relative carbohydrate composition determined by Py-GC/MS for the wood samples differed from the values obtained by acid hydrolysis. Significantly better correlation between the two methods was observed for the pulp samples cooked to varying kappa number levels. Fractionated pyrolysis was applied in order to find explanation to the observed difference in the degradation behavior of carbohydrates in wood and pulp samples. Due to the close association of lignin and carbohydrates, the thermal behavior of lignin was followed as well. The results showed that the thermal behavior of xylan and cellulose differed in the wood samples, but were almost equal in the pulp samples. Thermal degradation of xylan was similar with lignin in both sample types. Similar thermal behavior between the components is a prerequisite for reliable Py-GC/MS analysis. Therefore, this method cannot be recommended for the comparison of carbohydrate compositions between different wood raw materials. However, it is applicable to pulp samples and may find application in research for profiling carbohydrate compositional changes with processing methods: and conditions.

中文翻译：

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桉树木材和纸浆中的碳水化合物组成 - Py-GC/MS 和酸水解之间的比较

摘要 在分析热解中，碳水化合物被降解为稳定的脱水糖，并通过 GC/MS 进行分析。Py-GC/MS 的优势在于，与传统方法相反，可以从基于纤维的材料中同时测定纤维组成，包括碳水化合物、木质素及其 S/G 比，而无需大量预处理。在本研究中，通过 Py-GC/MS 确定了各种桉树物种的相对碳水化合物组成。此外，对通过苏打-AQ 和苏打-O 2 工艺从同一物种生产的纸浆进行了类似的分析。将结果与通过酸水解然后通过HPLC获得的结果进行比较。该比较表明，通过 Py-GC/MS 确定的木材样品的相对碳水化合物组成与通过酸水解获得的值不同。对于煮熟至不同卡伯值水平的纸浆样品，观察到两种方法之间的相关性明显更好。应用分馏热解是为了解释所观察到的木材和纸浆样品中碳水化合物降解行为的差异。由于木质素和碳水化合物的密切关联，木质素的热行为也被遵循。结果表明，木聚糖和纤维素的热行为在木材样品中不同，但在纸浆样品中几乎相同。在两种样品类型中，木聚糖的热降解与木质素相似。组件之间类似的热行为是可靠的 Py-GC/MS 分析的先决条件。因此，不能推荐该方法用于比较不同木材原料之间的碳水化合物组成。然而，